Merge changes from topic "migrate-sc-bt" into sc-v2-dev-plus-aosp

* changes:
  Migrating BT files into packages/modules/Bluetooth
  Merge history of Bluetooth API from frameworks/base

1 files changed, 4427 insertions, 0 deletions

diff --git a/framework/java/android/bluetooth/BluetoothAdapter.java b/framework/java/android/bluetooth/BluetoothAdapter.java
new file mode 100644
index 0000000000..ecbad5d60e
--- /dev/null
+++ b/framework/java/android/bluetooth/BluetoothAdapter.java
@@ -0,0 +1,4427 @@
+/*
+ * Copyright 2009-2016 The Android Open Source Project
+ * Copyright 2015 Samsung LSI
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.bluetooth;
+
+import static java.util.Objects.requireNonNull;
+
+import android.annotation.CallbackExecutor;
+import android.annotation.IntDef;
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.annotation.RequiresNoPermission;
+import android.annotation.RequiresPermission;
+import android.annotation.SdkConstant;
+import android.annotation.SdkConstant.SdkConstantType;
+import android.annotation.SuppressLint;
+import android.annotation.SystemApi; //import android.app.PropertyInvalidatedCache;
+import android.bluetooth.BluetoothDevice.Transport;
+import android.bluetooth.BluetoothProfile.ConnectionPolicy;
+import android.bluetooth.annotations.RequiresBluetoothAdvertisePermission;
+import android.bluetooth.annotations.RequiresBluetoothConnectPermission;
+import android.bluetooth.annotations.RequiresBluetoothLocationPermission;
+import android.bluetooth.annotations.RequiresBluetoothScanPermission;
+import android.bluetooth.annotations.RequiresLegacyBluetoothAdminPermission;
+import android.bluetooth.annotations.RequiresLegacyBluetoothPermission;
+import android.bluetooth.le.BluetoothLeAdvertiser;
+import android.bluetooth.le.BluetoothLeScanner;
+import android.bluetooth.le.PeriodicAdvertisingManager;
+import android.bluetooth.le.ScanCallback;
+import android.bluetooth.le.ScanFilter;
+import android.bluetooth.le.ScanRecord;
+import android.bluetooth.le.ScanResult;
+import android.bluetooth.le.ScanSettings;
+import android.compat.annotation.UnsupportedAppUsage;
+import android.content.AttributionSource;
+import android.content.Context;
+import android.os.Binder;
+import android.os.Build;
+import android.os.IBinder;
+import android.os.ParcelUuid;
+import android.os.RemoteException;
+import android.os.ResultReceiver;
+import android.os.ServiceManager;
+import android.sysprop.BluetoothProperties;
+import android.util.Log;
+import android.util.Pair;
+
+import com.android.internal.annotations.GuardedBy;
+
+import java.io.IOException;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.WeakHashMap;
+import java.util.concurrent.Executor;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+/**
+ * Represents the local device Bluetooth adapter. The {@link BluetoothAdapter}
+ * lets you perform fundamental Bluetooth tasks, such as initiate
+ * device discovery, query a list of bonded (paired) devices,
+ * instantiate a {@link BluetoothDevice} using a known MAC address, and create
+ * a {@link BluetoothServerSocket} to listen for connection requests from other
+ * devices, and start a scan for Bluetooth LE devices.
+ *
+ * <p>To get a {@link BluetoothAdapter} representing the local Bluetooth
+ * adapter, call the {@link BluetoothManager#getAdapter} function on {@link BluetoothManager}.
+ * On JELLY_BEAN_MR1 and below you will need to use the static {@link #getDefaultAdapter}
+ * method instead.
+ * </p><p>
+ * Fundamentally, this is your starting point for all
+ * Bluetooth actions. Once you have the local adapter, you can get a set of
+ * {@link BluetoothDevice} objects representing all paired devices with
+ * {@link #getBondedDevices()}; start device discovery with
+ * {@link #startDiscovery()}; or create a {@link BluetoothServerSocket} to
+ * listen for incoming RFComm connection requests with {@link
+ * #listenUsingRfcommWithServiceRecord(String, UUID)}; listen for incoming L2CAP Connection-oriented
+ * Channels (CoC) connection requests with {@link #listenUsingL2capChannel()}; or start a scan for
+ * Bluetooth LE devices with {@link #startLeScan(LeScanCallback callback)}.
+ * </p>
+ * <p>This class is thread safe.</p>
+ * <div class="special reference">
+ * <h3>Developer Guides</h3>
+ * <p>
+ * For more information about using Bluetooth, read the <a href=
+ * "{@docRoot}guide/topics/connectivity/bluetooth.html">Bluetooth</a> developer
+ * guide.
+ * </p>
+ * </div>
+ *
+ * {@see BluetoothDevice}
+ * {@see BluetoothServerSocket}
+ */
+public final class BluetoothAdapter {
+    private static final String TAG = "BluetoothAdapter";
+    private static final String DESCRIPTOR = "android.bluetooth.BluetoothAdapter";
+    private static final boolean DBG = true;
+    private static final boolean VDBG = false;
+
+    /**
+     * Default MAC address reported to a client that does not have the
+     * android.permission.LOCAL_MAC_ADDRESS permission.
+     *
+     * @hide
+     */
+    public static final String DEFAULT_MAC_ADDRESS = "02:00:00:00:00:00";
+
+    /**
+     * Sentinel error value for this class. Guaranteed to not equal any other
+     * integer constant in this class. Provided as a convenience for functions
+     * that require a sentinel error value, for example:
+     * <p><code>Intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
+     * BluetoothAdapter.ERROR)</code>
+     */
+    public static final int ERROR = Integer.MIN_VALUE;
+
+    /**
+     * Broadcast Action: The state of the local Bluetooth adapter has been
+     * changed.
+     * <p>For example, Bluetooth has been turned on or off.
+     * <p>Always contains the extra fields {@link #EXTRA_STATE} and {@link
+     * #EXTRA_PREVIOUS_STATE} containing the new and old states
+     * respectively.
+     */
+    @RequiresLegacyBluetoothPermission
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String
+            ACTION_STATE_CHANGED = "android.bluetooth.adapter.action.STATE_CHANGED";
+
+    /**
+     * Used as an int extra field in {@link #ACTION_STATE_CHANGED}
+     * intents to request the current power state. Possible values are:
+     * {@link #STATE_OFF},
+     * {@link #STATE_TURNING_ON},
+     * {@link #STATE_ON},
+     * {@link #STATE_TURNING_OFF},
+     */
+    public static final String EXTRA_STATE = "android.bluetooth.adapter.extra.STATE";
+    /**
+     * Used as an int extra field in {@link #ACTION_STATE_CHANGED}
+     * intents to request the previous power state. Possible values are:
+     * {@link #STATE_OFF},
+     * {@link #STATE_TURNING_ON},
+     * {@link #STATE_ON},
+     * {@link #STATE_TURNING_OFF}
+     */
+    public static final String EXTRA_PREVIOUS_STATE =
+            "android.bluetooth.adapter.extra.PREVIOUS_STATE";
+
+    /** @hide */
+    @IntDef(prefix = { "STATE_" }, value = {
+            STATE_OFF,
+            STATE_TURNING_ON,
+            STATE_ON,
+            STATE_TURNING_OFF,
+            STATE_BLE_TURNING_ON,
+            STATE_BLE_ON,
+            STATE_BLE_TURNING_OFF
+    })
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface AdapterState {}
+
+    /**
+     * Indicates the local Bluetooth adapter is off.
+     */
+    public static final int STATE_OFF = 10;
+    /**
+     * Indicates the local Bluetooth adapter is turning on. However local
+     * clients should wait for {@link #STATE_ON} before attempting to
+     * use the adapter.
+     */
+    public static final int STATE_TURNING_ON = 11;
+    /**
+     * Indicates the local Bluetooth adapter is on, and ready for use.
+     */
+    public static final int STATE_ON = 12;
+    /**
+     * Indicates the local Bluetooth adapter is turning off. Local clients
+     * should immediately attempt graceful disconnection of any remote links.
+     */
+    public static final int STATE_TURNING_OFF = 13;
+
+    /**
+     * Indicates the local Bluetooth adapter is turning Bluetooth LE mode on.
+     *
+     * @hide
+     */
+    public static final int STATE_BLE_TURNING_ON = 14;
+
+    /**
+     * Indicates the local Bluetooth adapter is in LE only mode.
+     *
+     * @hide
+     */
+    public static final int STATE_BLE_ON = 15;
+
+    /**
+     * Indicates the local Bluetooth adapter is turning off LE only mode.
+     *
+     * @hide
+     */
+    public static final int STATE_BLE_TURNING_OFF = 16;
+
+    /**
+     * UUID of the GATT Read Characteristics for LE_PSM value.
+     *
+     * @hide
+     */
+    public static final UUID LE_PSM_CHARACTERISTIC_UUID =
+            UUID.fromString("2d410339-82b6-42aa-b34e-e2e01df8cc1a");
+
+    /**
+     * Human-readable string helper for AdapterState
+     *
+     * @hide
+     */
+    public static String nameForState(@AdapterState int state) {
+        switch (state) {
+            case STATE_OFF:
+                return "OFF";
+            case STATE_TURNING_ON:
+                return "TURNING_ON";
+            case STATE_ON:
+                return "ON";
+            case STATE_TURNING_OFF:
+                return "TURNING_OFF";
+            case STATE_BLE_TURNING_ON:
+                return "BLE_TURNING_ON";
+            case STATE_BLE_ON:
+                return "BLE_ON";
+            case STATE_BLE_TURNING_OFF:
+                return "BLE_TURNING_OFF";
+            default:
+                return "?!?!? (" + state + ")";
+        }
+    }
+
+    /**
+     * Activity Action: Show a system activity that requests discoverable mode.
+     * This activity will also request the user to turn on Bluetooth if it
+     * is not currently enabled.
+     * <p>Discoverable mode is equivalent to {@link
+     * #SCAN_MODE_CONNECTABLE_DISCOVERABLE}. It allows remote devices to see
+     * this Bluetooth adapter when they perform a discovery.
+     * <p>For privacy, Android is not discoverable by default.
+     * <p>The sender of this Intent can optionally use extra field {@link
+     * #EXTRA_DISCOVERABLE_DURATION} to request the duration of
+     * discoverability. Currently the default duration is 120 seconds, and
+     * maximum duration is capped at 300 seconds for each request.
+     * <p>Notification of the result of this activity is posted using the
+     * {@link android.app.Activity#onActivityResult} callback. The
+     * <code>resultCode</code>
+     * will be the duration (in seconds) of discoverability or
+     * {@link android.app.Activity#RESULT_CANCELED} if the user rejected
+     * discoverability or an error has occurred.
+     * <p>Applications can also listen for {@link #ACTION_SCAN_MODE_CHANGED}
+     * for global notification whenever the scan mode changes. For example, an
+     * application can be notified when the device has ended discoverability.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothAdvertisePermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_ADVERTISE)
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) public static final String
+            ACTION_REQUEST_DISCOVERABLE = "android.bluetooth.adapter.action.REQUEST_DISCOVERABLE";
+
+    /**
+     * Used as an optional int extra field in {@link
+     * #ACTION_REQUEST_DISCOVERABLE} intents to request a specific duration
+     * for discoverability in seconds. The current default is 120 seconds, and
+     * requests over 300 seconds will be capped. These values could change.
+     */
+    public static final String EXTRA_DISCOVERABLE_DURATION =
+            "android.bluetooth.adapter.extra.DISCOVERABLE_DURATION";
+
+    /**
+     * Activity Action: Show a system activity that allows the user to turn on
+     * Bluetooth.
+     * <p>This system activity will return once Bluetooth has completed turning
+     * on, or the user has decided not to turn Bluetooth on.
+     * <p>Notification of the result of this activity is posted using the
+     * {@link android.app.Activity#onActivityResult} callback. The
+     * <code>resultCode</code>
+     * will be {@link android.app.Activity#RESULT_OK} if Bluetooth has been
+     * turned on or {@link android.app.Activity#RESULT_CANCELED} if the user
+     * has rejected the request or an error has occurred.
+     * <p>Applications can also listen for {@link #ACTION_STATE_CHANGED}
+     * for global notification whenever Bluetooth is turned on or off.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) public static final String
+            ACTION_REQUEST_ENABLE = "android.bluetooth.adapter.action.REQUEST_ENABLE";
+
+    /**
+     * Activity Action: Show a system activity that allows the user to turn off
+     * Bluetooth. This is used only if permission review is enabled which is for
+     * apps targeting API less than 23 require a permission review before any of
+     * the app's components can run.
+     * <p>This system activity will return once Bluetooth has completed turning
+     * off, or the user has decided not to turn Bluetooth off.
+     * <p>Notification of the result of this activity is posted using the
+     * {@link android.app.Activity#onActivityResult} callback. The
+     * <code>resultCode</code>
+     * will be {@link android.app.Activity#RESULT_OK} if Bluetooth has been
+     * turned off or {@link android.app.Activity#RESULT_CANCELED} if the user
+     * has rejected the request or an error has occurred.
+     * <p>Applications can also listen for {@link #ACTION_STATE_CHANGED}
+     * for global notification whenever Bluetooth is turned on or off.
+     *
+     * @hide
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) public static final String
+            ACTION_REQUEST_DISABLE = "android.bluetooth.adapter.action.REQUEST_DISABLE";
+
+    /**
+     * Activity Action: Show a system activity that allows user to enable BLE scans even when
+     * Bluetooth is turned off.<p>
+     *
+     * Notification of result of this activity is posted using
+     * {@link android.app.Activity#onActivityResult}. The <code>resultCode</code> will be
+     * {@link android.app.Activity#RESULT_OK} if BLE scan always available setting is turned on or
+     * {@link android.app.Activity#RESULT_CANCELED} if the user has rejected the request or an
+     * error occurred.
+     *
+     * @hide
+     */
+    @SystemApi
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
+    public static final String ACTION_REQUEST_BLE_SCAN_ALWAYS_AVAILABLE =
+            "android.bluetooth.adapter.action.REQUEST_BLE_SCAN_ALWAYS_AVAILABLE";
+
+    /**
+     * Broadcast Action: Indicates the Bluetooth scan mode of the local Adapter
+     * has changed.
+     * <p>Always contains the extra fields {@link #EXTRA_SCAN_MODE} and {@link
+     * #EXTRA_PREVIOUS_SCAN_MODE} containing the new and old scan modes
+     * respectively.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String
+            ACTION_SCAN_MODE_CHANGED = "android.bluetooth.adapter.action.SCAN_MODE_CHANGED";
+
+    /**
+     * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED}
+     * intents to request the current scan mode. Possible values are:
+     * {@link #SCAN_MODE_NONE},
+     * {@link #SCAN_MODE_CONNECTABLE},
+     * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE},
+     */
+    public static final String EXTRA_SCAN_MODE = "android.bluetooth.adapter.extra.SCAN_MODE";
+    /**
+     * Used as an int extra field in {@link #ACTION_SCAN_MODE_CHANGED}
+     * intents to request the previous scan mode. Possible values are:
+     * {@link #SCAN_MODE_NONE},
+     * {@link #SCAN_MODE_CONNECTABLE},
+     * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE},
+     */
+    public static final String EXTRA_PREVIOUS_SCAN_MODE =
+            "android.bluetooth.adapter.extra.PREVIOUS_SCAN_MODE";
+
+    /** @hide */
+    @IntDef(prefix = { "SCAN_" }, value = {
+            SCAN_MODE_NONE,
+            SCAN_MODE_CONNECTABLE,
+            SCAN_MODE_CONNECTABLE_DISCOVERABLE
+    })
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface ScanMode {}
+
+    /**
+     * Indicates that both inquiry scan and page scan are disabled on the local
+     * Bluetooth adapter. Therefore this device is neither discoverable
+     * nor connectable from remote Bluetooth devices.
+     */
+    public static final int SCAN_MODE_NONE = 20;
+    /**
+     * Indicates that inquiry scan is disabled, but page scan is enabled on the
+     * local Bluetooth adapter. Therefore this device is not discoverable from
+     * remote Bluetooth devices, but is connectable from remote devices that
+     * have previously discovered this device.
+     */
+    public static final int SCAN_MODE_CONNECTABLE = 21;
+    /**
+     * Indicates that both inquiry scan and page scan are enabled on the local
+     * Bluetooth adapter. Therefore this device is both discoverable and
+     * connectable from remote Bluetooth devices.
+     */
+    public static final int SCAN_MODE_CONNECTABLE_DISCOVERABLE = 23;
+
+    /**
+     * Device only has a display.
+     *
+     * @hide
+     */
+    public static final int IO_CAPABILITY_OUT = 0;
+
+    /**
+     * Device has a display and the ability to input Yes/No.
+     *
+     * @hide
+     */
+    public static final int IO_CAPABILITY_IO = 1;
+
+    /**
+     * Device only has a keyboard for entry but no display.
+     *
+     * @hide
+     */
+    public static final int IO_CAPABILITY_IN = 2;
+
+    /**
+     * Device has no Input or Output capability.
+     *
+     * @hide
+     */
+    public static final int IO_CAPABILITY_NONE = 3;
+
+    /**
+     * Device has a display and a full keyboard.
+     *
+     * @hide
+     */
+    public static final int IO_CAPABILITY_KBDISP = 4;
+
+    /**
+     * Maximum range value for Input/Output capabilities.
+     *
+     * <p>This should be updated when adding a new Input/Output capability. Other code
+     * like validation depends on this being accurate.
+     *
+     * @hide
+     */
+    public static final int IO_CAPABILITY_MAX = 5;
+
+    /**
+     * The Input/Output capability of the device is unknown.
+     *
+     * @hide
+     */
+    public static final int IO_CAPABILITY_UNKNOWN = 255;
+
+    /** @hide */
+    @IntDef({IO_CAPABILITY_OUT, IO_CAPABILITY_IO, IO_CAPABILITY_IN, IO_CAPABILITY_NONE,
+            IO_CAPABILITY_KBDISP})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface IoCapability {}
+
+    /** @hide */
+    @IntDef(prefix = "ACTIVE_DEVICE_", value = {ACTIVE_DEVICE_AUDIO,
+            ACTIVE_DEVICE_PHONE_CALL, ACTIVE_DEVICE_ALL})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface ActiveDeviceUse {}
+
+    /**
+     * Use the specified device for audio (a2dp and hearing aid profile)
+     *
+     * @hide
+     */
+    @SystemApi
+    public static final int ACTIVE_DEVICE_AUDIO = 0;
+
+    /**
+     * Use the specified device for phone calls (headset profile and hearing
+     * aid profile)
+     *
+     * @hide
+     */
+    @SystemApi
+    public static final int ACTIVE_DEVICE_PHONE_CALL = 1;
+
+    /**
+     * Use the specified device for a2dp, hearing aid profile, and headset profile
+     *
+     * @hide
+     */
+    @SystemApi
+    public static final int ACTIVE_DEVICE_ALL = 2;
+
+    /** @hide */
+    @IntDef({BluetoothProfile.HEADSET, BluetoothProfile.A2DP,
+            BluetoothProfile.HEARING_AID})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface ActiveDeviceProfile {}
+
+    /**
+     * Broadcast Action: The local Bluetooth adapter has started the remote
+     * device discovery process.
+     * <p>This usually involves an inquiry scan of about 12 seconds, followed
+     * by a page scan of each new device to retrieve its Bluetooth name.
+     * <p>Register for {@link BluetoothDevice#ACTION_FOUND} to be notified as
+     * remote Bluetooth devices are found.
+     * <p>Device discovery is a heavyweight procedure. New connections to
+     * remote Bluetooth devices should not be attempted while discovery is in
+     * progress, and existing connections will experience limited bandwidth
+     * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing
+     * discovery.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String
+            ACTION_DISCOVERY_STARTED = "android.bluetooth.adapter.action.DISCOVERY_STARTED";
+    /**
+     * Broadcast Action: The local Bluetooth adapter has finished the device
+     * discovery process.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String
+            ACTION_DISCOVERY_FINISHED = "android.bluetooth.adapter.action.DISCOVERY_FINISHED";
+
+    /**
+     * Broadcast Action: The local Bluetooth adapter has changed its friendly
+     * Bluetooth name.
+     * <p>This name is visible to remote Bluetooth devices.
+     * <p>Always contains the extra field {@link #EXTRA_LOCAL_NAME} containing
+     * the name.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String
+            ACTION_LOCAL_NAME_CHANGED = "android.bluetooth.adapter.action.LOCAL_NAME_CHANGED";
+    /**
+     * Used as a String extra field in {@link #ACTION_LOCAL_NAME_CHANGED}
+     * intents to request the local Bluetooth name.
+     */
+    public static final String EXTRA_LOCAL_NAME = "android.bluetooth.adapter.extra.LOCAL_NAME";
+
+    /**
+     * Intent used to broadcast the change in connection state of the local
+     * Bluetooth adapter to a profile of the remote device. When the adapter is
+     * not connected to any profiles of any remote devices and it attempts a
+     * connection to a profile this intent will be sent. Once connected, this intent
+     * will not be sent for any more connection attempts to any profiles of any
+     * remote device. When the adapter disconnects from the last profile its
+     * connected to of any remote device, this intent will be sent.
+     *
+     * <p> This intent is useful for applications that are only concerned about
+     * whether the local adapter is connected to any profile of any device and
+     * are not really concerned about which profile. For example, an application
+     * which displays an icon to display whether Bluetooth is connected or not
+     * can use this intent.
+     *
+     * <p>This intent will have 3 extras:
+     * {@link #EXTRA_CONNECTION_STATE} - The current connection state.
+     * {@link #EXTRA_PREVIOUS_CONNECTION_STATE}- The previous connection state.
+     * {@link BluetoothDevice#EXTRA_DEVICE} - The remote device.
+     *
+     * {@link #EXTRA_CONNECTION_STATE} or {@link #EXTRA_PREVIOUS_CONNECTION_STATE}
+     * can be any of {@link #STATE_DISCONNECTED}, {@link #STATE_CONNECTING},
+     * {@link #STATE_CONNECTED}, {@link #STATE_DISCONNECTING}.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) public static final String
+            ACTION_CONNECTION_STATE_CHANGED =
+            "android.bluetooth.adapter.action.CONNECTION_STATE_CHANGED";
+
+    /**
+     * Extra used by {@link #ACTION_CONNECTION_STATE_CHANGED}
+     *
+     * This extra represents the current connection state.
+     */
+    public static final String EXTRA_CONNECTION_STATE =
+            "android.bluetooth.adapter.extra.CONNECTION_STATE";
+
+    /**
+     * Extra used by {@link #ACTION_CONNECTION_STATE_CHANGED}
+     *
+     * This extra represents the previous connection state.
+     */
+    public static final String EXTRA_PREVIOUS_CONNECTION_STATE =
+            "android.bluetooth.adapter.extra.PREVIOUS_CONNECTION_STATE";
+
+    /**
+     * Broadcast Action: The Bluetooth adapter state has changed in LE only mode.
+     *
+     * @hide
+     */
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    @SystemApi public static final String ACTION_BLE_STATE_CHANGED =
+            "android.bluetooth.adapter.action.BLE_STATE_CHANGED";
+
+    /**
+     * Intent used to broadcast the change in the Bluetooth address
+     * of the local Bluetooth adapter.
+     * <p>Always contains the extra field {@link
+     * #EXTRA_BLUETOOTH_ADDRESS} containing the Bluetooth address.
+     *
+     * Note: only system level processes are allowed to send this
+     * defined broadcast.
+     *
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_BLUETOOTH_ADDRESS_CHANGED =
+            "android.bluetooth.adapter.action.BLUETOOTH_ADDRESS_CHANGED";
+
+    /**
+     * Used as a String extra field in {@link
+     * #ACTION_BLUETOOTH_ADDRESS_CHANGED} intent to store the local
+     * Bluetooth address.
+     *
+     * @hide
+     */
+    public static final String EXTRA_BLUETOOTH_ADDRESS =
+            "android.bluetooth.adapter.extra.BLUETOOTH_ADDRESS";
+
+    /**
+     * Broadcast Action: The notifys Bluetooth ACL connected event. This will be
+     * by BLE Always on enabled application to know the ACL_CONNECTED event
+     * when Bluetooth state in STATE_BLE_ON. This denotes GATT connection
+     * as Bluetooth LE is the only feature available in STATE_BLE_ON
+     *
+     * This is counterpart of {@link BluetoothDevice#ACTION_ACL_CONNECTED} which
+     * works in Bluetooth state STATE_ON
+     *
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_BLE_ACL_CONNECTED =
+            "android.bluetooth.adapter.action.BLE_ACL_CONNECTED";
+
+    /**
+     * Broadcast Action: The notifys Bluetooth ACL connected event. This will be
+     * by BLE Always on enabled application to know the ACL_DISCONNECTED event
+     * when Bluetooth state in STATE_BLE_ON. This denotes GATT disconnection as Bluetooth
+     * LE is the only feature available in STATE_BLE_ON
+     *
+     * This is counterpart of {@link BluetoothDevice#ACTION_ACL_DISCONNECTED} which
+     * works in Bluetooth state STATE_ON
+     *
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_BLE_ACL_DISCONNECTED =
+            "android.bluetooth.adapter.action.BLE_ACL_DISCONNECTED";
+
+    /** The profile is in disconnected state */
+    public static final int STATE_DISCONNECTED =
+            0; //BluetoothProtoEnums.CONNECTION_STATE_DISCONNECTED;
+    /** The profile is in connecting state */
+    public static final int STATE_CONNECTING = 1; //BluetoothProtoEnums.CONNECTION_STATE_CONNECTING;
+    /** The profile is in connected state */
+    public static final int STATE_CONNECTED = 2; //BluetoothProtoEnums.CONNECTION_STATE_CONNECTED;
+    /** The profile is in disconnecting state */
+    public static final int STATE_DISCONNECTING =
+            3; //BluetoothProtoEnums.CONNECTION_STATE_DISCONNECTING;
+
+    /** @hide */
+    public static final String BLUETOOTH_MANAGER_SERVICE = "bluetooth_manager";
+    private final IBinder mToken;
+
+
+    /**
+     * When creating a ServerSocket using listenUsingRfcommOn() or
+     * listenUsingL2capOn() use SOCKET_CHANNEL_AUTO_STATIC to create
+     * a ServerSocket that auto assigns a channel number to the first
+     * bluetooth socket.
+     * The channel number assigned to this first Bluetooth Socket will
+     * be stored in the ServerSocket, and reused for subsequent Bluetooth
+     * sockets.
+     *
+     * @hide
+     */
+    public static final int SOCKET_CHANNEL_AUTO_STATIC_NO_SDP = -2;
+
+
+    private static final int ADDRESS_LENGTH = 17;
+
+    /**
+     * Lazily initialized singleton. Guaranteed final after first object
+     * constructed.
+     */
+    private static BluetoothAdapter sAdapter;
+
+    private BluetoothLeScanner mBluetoothLeScanner;
+    private BluetoothLeAdvertiser mBluetoothLeAdvertiser;
+    private PeriodicAdvertisingManager mPeriodicAdvertisingManager;
+
+    private final IBluetoothManager mManagerService;
+    private final AttributionSource mAttributionSource;
+
+    // Yeah, keeping both mService and sService isn't pretty, but it's too late
+    // in the current release for a major refactoring, so we leave them both
+    // intact until this can be cleaned up in a future release
+
+    @UnsupportedAppUsage
+    @GuardedBy("mServiceLock")
+    private IBluetooth mService;
+    private final ReentrantReadWriteLock mServiceLock = new ReentrantReadWriteLock();
+
+    @GuardedBy("sServiceLock")
+    private static boolean sServiceRegistered;
+    @GuardedBy("sServiceLock")
+    private static IBluetooth sService;
+    private static final Object sServiceLock = new Object();
+
+    private final Object mLock = new Object();
+    private final Map<LeScanCallback, ScanCallback> mLeScanClients;
+    private final Map<BluetoothDevice, List<Pair<OnMetadataChangedListener, Executor>>>
+                mMetadataListeners = new HashMap<>();
+    private final Map<BluetoothConnectionCallback, Executor>
+            mBluetoothConnectionCallbackExecutorMap = new HashMap<>();
+
+    /**
+     * Bluetooth metadata listener. Overrides the default BluetoothMetadataListener
+     * implementation.
+     */
+    @SuppressLint("AndroidFrameworkBluetoothPermission")
+    private final IBluetoothMetadataListener mBluetoothMetadataListener =
+            new IBluetoothMetadataListener.Stub() {
+        @Override
+        public void onMetadataChanged(BluetoothDevice device, int key, byte[] value) {
+            Attributable.setAttributionSource(device, mAttributionSource);
+            synchronized (mMetadataListeners) {
+                if (mMetadataListeners.containsKey(device)) {
+                    List<Pair<OnMetadataChangedListener, Executor>> list =
+                            mMetadataListeners.get(device);
+                    for (Pair<OnMetadataChangedListener, Executor> pair : list) {
+                        OnMetadataChangedListener listener = pair.first;
+                        Executor executor = pair.second;
+                        executor.execute(() -> {
+                            listener.onMetadataChanged(device, key, value);
+                        });
+                    }
+                }
+            }
+            return;
+        }
+    };
+
+    /**
+     * Get a handle to the default local Bluetooth adapter.
+     * <p>
+     * Currently Android only supports one Bluetooth adapter, but the API could
+     * be extended to support more. This will always return the default adapter.
+     * </p>
+     *
+     * @return the default local adapter, or null if Bluetooth is not supported
+     *         on this hardware platform
+     * @deprecated this method will continue to work, but developers are
+     *             strongly encouraged to migrate to using
+     *             {@link BluetoothManager#getAdapter()}, since that approach
+     *             enables support for {@link Context#createAttributionContext}.
+     */
+    @Deprecated
+    @RequiresNoPermission
+    public static synchronized BluetoothAdapter getDefaultAdapter() {
+        if (sAdapter == null) {
+            sAdapter = createAdapter(AttributionSource.myAttributionSource());
+        }
+        return sAdapter;
+    }
+
+    /** {@hide} */
+    public static BluetoothAdapter createAdapter(AttributionSource attributionSource) {
+        IBinder binder = ServiceManager.getService(BLUETOOTH_MANAGER_SERVICE);
+        if (binder != null) {
+            return new BluetoothAdapter(IBluetoothManager.Stub.asInterface(binder),
+                    attributionSource);
+        } else {
+            Log.e(TAG, "Bluetooth binder is null");
+            return null;
+        }
+    }
+
+    /**
+     * Use {@link #getDefaultAdapter} to get the BluetoothAdapter instance.
+     */
+    BluetoothAdapter(IBluetoothManager managerService, AttributionSource attributionSource) {
+        mManagerService = Objects.requireNonNull(managerService);
+        mAttributionSource = Objects.requireNonNull(attributionSource);
+        synchronized (mServiceLock.writeLock()) {
+            mService = getBluetoothService(mManagerCallback);
+        }
+        mLeScanClients = new HashMap<LeScanCallback, ScanCallback>();
+        mToken = new Binder(DESCRIPTOR);
+    }
+
+    /**
+     * Get a {@link BluetoothDevice} object for the given Bluetooth hardware
+     * address.
+     * <p>Valid Bluetooth hardware addresses must be upper case, in a format
+     * such as "00:11:22:33:AA:BB". The helper {@link #checkBluetoothAddress} is
+     * available to validate a Bluetooth address.
+     * <p>A {@link BluetoothDevice} will always be returned for a valid
+     * hardware address, even if this adapter has never seen that device.
+     *
+     * @param address valid Bluetooth MAC address
+     * @throws IllegalArgumentException if address is invalid
+     */
+    @RequiresNoPermission
+    public BluetoothDevice getRemoteDevice(String address) {
+        final BluetoothDevice res = new BluetoothDevice(address);
+        res.setAttributionSource(mAttributionSource);
+        return res;
+    }
+
+    /**
+     * Get a {@link BluetoothDevice} object for the given Bluetooth hardware
+     * address.
+     * <p>Valid Bluetooth hardware addresses must be 6 bytes. This method
+     * expects the address in network byte order (MSB first).
+     * <p>A {@link BluetoothDevice} will always be returned for a valid
+     * hardware address, even if this adapter has never seen that device.
+     *
+     * @param address Bluetooth MAC address (6 bytes)
+     * @throws IllegalArgumentException if address is invalid
+     */
+    @RequiresNoPermission
+    public BluetoothDevice getRemoteDevice(byte[] address) {
+        if (address == null || address.length != 6) {
+            throw new IllegalArgumentException("Bluetooth address must have 6 bytes");
+        }
+        final BluetoothDevice res = new BluetoothDevice(
+                String.format(Locale.US, "%02X:%02X:%02X:%02X:%02X:%02X", address[0], address[1],
+                        address[2], address[3], address[4], address[5]));
+        res.setAttributionSource(mAttributionSource);
+        return res;
+    }
+
+    /**
+     * Returns a {@link BluetoothLeAdvertiser} object for Bluetooth LE Advertising operations.
+     * Will return null if Bluetooth is turned off or if Bluetooth LE Advertising is not
+     * supported on this device.
+     * <p>
+     * Use {@link #isMultipleAdvertisementSupported()} to check whether LE Advertising is supported
+     * on this device before calling this method.
+     */
+    @RequiresNoPermission
+    public BluetoothLeAdvertiser getBluetoothLeAdvertiser() {
+        if (!getLeAccess()) {
+            return null;
+        }
+        synchronized (mLock) {
+            if (mBluetoothLeAdvertiser == null) {
+                mBluetoothLeAdvertiser = new BluetoothLeAdvertiser(this);
+            }
+            return mBluetoothLeAdvertiser;
+        }
+    }
+
+    /**
+     * Returns a {@link PeriodicAdvertisingManager} object for Bluetooth LE Periodic Advertising
+     * operations. Will return null if Bluetooth is turned off or if Bluetooth LE Periodic
+     * Advertising is not supported on this device.
+     * <p>
+     * Use {@link #isLePeriodicAdvertisingSupported()} to check whether LE Periodic Advertising is
+     * supported on this device before calling this method.
+     *
+     * @hide
+     */
+    @RequiresNoPermission
+    public PeriodicAdvertisingManager getPeriodicAdvertisingManager() {
+        if (!getLeAccess()) {
+            return null;
+        }
+
+        if (!isLePeriodicAdvertisingSupported()) {
+            return null;
+        }
+
+        synchronized (mLock) {
+            if (mPeriodicAdvertisingManager == null) {
+                mPeriodicAdvertisingManager = new PeriodicAdvertisingManager(this);
+            }
+            return mPeriodicAdvertisingManager;
+        }
+    }
+
+    /**
+     * Returns a {@link BluetoothLeScanner} object for Bluetooth LE scan operations.
+     */
+    @RequiresNoPermission
+    public BluetoothLeScanner getBluetoothLeScanner() {
+        if (!getLeAccess()) {
+            return null;
+        }
+        synchronized (mLock) {
+            if (mBluetoothLeScanner == null) {
+                mBluetoothLeScanner = new BluetoothLeScanner(this);
+            }
+            return mBluetoothLeScanner;
+        }
+    }
+
+    /**
+     * Return true if Bluetooth is currently enabled and ready for use.
+     * <p>Equivalent to:
+     * <code>getBluetoothState() == STATE_ON</code>
+     *
+     * @return true if the local adapter is turned on
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public boolean isEnabled() {
+        return getState() == BluetoothAdapter.STATE_ON;
+    }
+
+    /**
+     * Return true if Bluetooth LE(Always BLE On feature) is currently
+     * enabled and ready for use
+     * <p>This returns true if current state is either STATE_ON or STATE_BLE_ON
+     *
+     * @return true if the local Bluetooth LE adapter is turned on
+     * @hide
+     */
+    @SystemApi
+    @RequiresNoPermission
+    public boolean isLeEnabled() {
+        final int state = getLeState();
+        if (DBG) {
+            Log.d(TAG, "isLeEnabled(): " + BluetoothAdapter.nameForState(state));
+        }
+        return (state == BluetoothAdapter.STATE_ON
+                || state == BluetoothAdapter.STATE_BLE_ON
+                || state == BluetoothAdapter.STATE_TURNING_ON
+                || state == BluetoothAdapter.STATE_TURNING_OFF);
+    }
+
+    /**
+     * Turns off Bluetooth LE which was earlier turned on by calling enableBLE().
+     *
+     * <p> If the internal Adapter state is STATE_BLE_ON, this would trigger the transition
+     * to STATE_OFF and completely shut-down Bluetooth
+     *
+     * <p> If the Adapter state is STATE_ON, This would unregister the existance of
+     * special Bluetooth LE application and hence the further turning off of Bluetooth
+     * from UI would ensure the complete turn-off of Bluetooth rather than staying back
+     * BLE only state
+     *
+     * <p>This is an asynchronous call: it will return immediately, and
+     * clients should listen for {@link #ACTION_BLE_STATE_CHANGED}
+     * to be notified of subsequent adapter state changes If this call returns
+     * true, then the adapter state will immediately transition from {@link
+     * #STATE_ON} to {@link #STATE_TURNING_OFF}, and some time
+     * later transition to either {@link #STATE_BLE_ON} or {@link
+     * #STATE_OFF} based on the existance of the further Always BLE ON enabled applications
+     * If this call returns false then there was an
+     * immediate problem that will prevent the QAdapter from being turned off -
+     * such as the QAadapter already being turned off.
+     *
+     * @return true to indicate success, or false on immediate error
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean disableBLE() {
+        if (!isBleScanAlwaysAvailable()) {
+            return false;
+        }
+        try {
+            return mManagerService.disableBle(mAttributionSource, mToken);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return false;
+    }
+
+    /**
+     * Applications who want to only use Bluetooth Low Energy (BLE) can call enableBLE.
+     *
+     * enableBLE registers the existence of an app using only LE functions.
+     *
+     * enableBLE may enable Bluetooth to an LE only mode so that an app can use
+     * LE related features (BluetoothGatt or BluetoothGattServer classes)
+     *
+     * If the user disables Bluetooth while an app is registered to use LE only features,
+     * Bluetooth will remain on in LE only mode for the app.
+     *
+     * When Bluetooth is in LE only mode, it is not shown as ON to the UI.
+     *
+     * <p>This is an asynchronous call: it returns immediately, and
+     * clients should listen for {@link #ACTION_BLE_STATE_CHANGED}
+     * to be notified of adapter state changes.
+     *
+     * If this call returns * true, then the adapter state is either in a mode where
+     * LE is available, or will transition from {@link #STATE_OFF} to {@link #STATE_BLE_TURNING_ON},
+     * and some time later transition to either {@link #STATE_OFF} or {@link #STATE_BLE_ON}.
+     *
+     * If this call returns false then there was an immediate problem that prevents the
+     * adapter from being turned on - such as Airplane mode.
+     *
+     * {@link #ACTION_BLE_STATE_CHANGED} returns the Bluetooth Adapter's various
+     * states, It includes all the classic Bluetooth Adapter states along with
+     * internal BLE only states
+     *
+     * @return true to indicate Bluetooth LE will be available, or false on immediate error
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean enableBLE() {
+        if (!isBleScanAlwaysAvailable()) {
+            return false;
+        }
+        try {
+            return mManagerService.enableBle(mAttributionSource, mToken);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+
+        return false;
+    }
+
+    /*
+    private static final String BLUETOOTH_GET_STATE_CACHE_PROPERTY = "cache_key.bluetooth.get_state";
+
+    private final PropertyInvalidatedCache<Void, Integer> mBluetoothGetStateCache =
+            new PropertyInvalidatedCache<Void, Integer>(
+                8, BLUETOOTH_GET_STATE_CACHE_PROPERTY) {
+                @Override
+                @SuppressLint("AndroidFrameworkRequiresPermission")
+                protected Integer recompute(Void query) {
+                    try {
+                        return mService.getState();
+                    } catch (RemoteException e) {
+                        throw e.rethrowFromSystemServer();
+                    }
+                }
+            };
+     */
+
+    /** @hide */
+    /*
+    @RequiresNoPermission
+    public void disableBluetoothGetStateCache() {
+        mBluetoothGetStateCache.disableLocal();
+    }
+     */
+
+    /** @hide */
+    /*
+    public static void invalidateBluetoothGetStateCache() {
+        PropertyInvalidatedCache.invalidateCache(BLUETOOTH_GET_STATE_CACHE_PROPERTY);
+    }
+     */
+
+    /**
+     * Fetch the current bluetooth state.  If the service is down, return
+     * OFF.
+     */
+    @AdapterState
+    private int getStateInternal() {
+        int state = BluetoothAdapter.STATE_OFF;
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                //state = mBluetoothGetStateCache.query(null);
+                state = mService.getState();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+            e.rethrowFromSystemServer();
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return state;
+    }
+
+    /**
+     * Get the current state of the local Bluetooth adapter.
+     * <p>Possible return values are
+     * {@link #STATE_OFF},
+     * {@link #STATE_TURNING_ON},
+     * {@link #STATE_ON},
+     * {@link #STATE_TURNING_OFF}.
+     *
+     * @return current state of Bluetooth adapter
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    @AdapterState
+    public int getState() {
+        int state = getStateInternal();
+
+        // Consider all internal states as OFF
+        if (state == BluetoothAdapter.STATE_BLE_ON || state == BluetoothAdapter.STATE_BLE_TURNING_ON
+                || state == BluetoothAdapter.STATE_BLE_TURNING_OFF) {
+            if (VDBG) {
+                Log.d(TAG, "Consider " + BluetoothAdapter.nameForState(state) + " state as OFF");
+            }
+            state = BluetoothAdapter.STATE_OFF;
+        }
+        if (VDBG) {
+            Log.d(TAG, "" + hashCode() + ": getState(). Returning " + BluetoothAdapter.nameForState(
+                    state));
+        }
+        return state;
+    }
+
+    /**
+     * Get the current state of the local Bluetooth adapter
+     * <p>This returns current internal state of Adapter including LE ON/OFF
+     *
+     * <p>Possible return values are
+     * {@link #STATE_OFF},
+     * {@link #STATE_BLE_TURNING_ON},
+     * {@link #STATE_BLE_ON},
+     * {@link #STATE_TURNING_ON},
+     * {@link #STATE_ON},
+     * {@link #STATE_TURNING_OFF},
+     * {@link #STATE_BLE_TURNING_OFF}.
+     *
+     * @return current state of Bluetooth adapter
+     * @hide
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    @AdapterState
+    @UnsupportedAppUsage(publicAlternatives = "Use {@link #getState()} instead to determine "
+            + "whether you can use BLE & BT classic.")
+    public int getLeState() {
+        int state = getStateInternal();
+
+        if (VDBG) {
+            Log.d(TAG, "getLeState() returning " + BluetoothAdapter.nameForState(state));
+        }
+        return state;
+    }
+
+    boolean getLeAccess() {
+        if (getLeState() == STATE_ON) {
+            return true;
+        } else if (getLeState() == STATE_BLE_ON) {
+            return true; // TODO: FILTER SYSTEM APPS HERE <--
+        }
+
+        return false;
+    }
+
+    /**
+     * Turn on the local Bluetooth adapter&mdash;do not use without explicit
+     * user action to turn on Bluetooth.
+     * <p>This powers on the underlying Bluetooth hardware, and starts all
+     * Bluetooth system services.
+     * <p class="caution"><strong>Bluetooth should never be enabled without
+     * direct user consent</strong>. If you want to turn on Bluetooth in order
+     * to create a wireless connection, you should use the {@link
+     * #ACTION_REQUEST_ENABLE} Intent, which will raise a dialog that requests
+     * user permission to turn on Bluetooth. The {@link #enable()} method is
+     * provided only for applications that include a user interface for changing
+     * system settings, such as a "power manager" app.</p>
+     * <p>This is an asynchronous call: it will return immediately, and
+     * clients should listen for {@link #ACTION_STATE_CHANGED}
+     * to be notified of subsequent adapter state changes. If this call returns
+     * true, then the adapter state will immediately transition from {@link
+     * #STATE_OFF} to {@link #STATE_TURNING_ON}, and some time
+     * later transition to either {@link #STATE_OFF} or {@link
+     * #STATE_ON}. If this call returns false then there was an
+     * immediate problem that will prevent the adapter from being turned on -
+     * such as Airplane mode, or the adapter is already turned on.
+     *
+     * @return true to indicate adapter startup has begun, or false on immediate error
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean enable() {
+        if (isEnabled()) {
+            if (DBG) {
+                Log.d(TAG, "enable(): BT already enabled!");
+            }
+            return true;
+        }
+        try {
+            return mManagerService.enable(mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return false;
+    }
+
+    /**
+     * Turn off the local Bluetooth adapter&mdash;do not use without explicit
+     * user action to turn off Bluetooth.
+     * <p>This gracefully shuts down all Bluetooth connections, stops Bluetooth
+     * system services, and powers down the underlying Bluetooth hardware.
+     * <p class="caution"><strong>Bluetooth should never be disabled without
+     * direct user consent</strong>. The {@link #disable()} method is
+     * provided only for applications that include a user interface for changing
+     * system settings, such as a "power manager" app.</p>
+     * <p>This is an asynchronous call: it will return immediately, and
+     * clients should listen for {@link #ACTION_STATE_CHANGED}
+     * to be notified of subsequent adapter state changes. If this call returns
+     * true, then the adapter state will immediately transition from {@link
+     * #STATE_ON} to {@link #STATE_TURNING_OFF}, and some time
+     * later transition to either {@link #STATE_OFF} or {@link
+     * #STATE_ON}. If this call returns false then there was an
+     * immediate problem that will prevent the adapter from being turned off -
+     * such as the adapter already being turned off.
+     *
+     * @return true to indicate adapter shutdown has begun, or false on immediate error
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean disable() {
+        try {
+            return mManagerService.disable(mAttributionSource, true);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return false;
+    }
+
+    /**
+     * Turn off the local Bluetooth adapter and don't persist the setting.
+     *
+     * @param persist Indicate whether the off state should be persisted following the next reboot
+     * @return true to indicate adapter shutdown has begun, or false on immediate error
+     * @hide
+     */
+    @SystemApi
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean disable(boolean persist) {
+
+        try {
+            return mManagerService.disable(mAttributionSource, persist);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return false;
+    }
+
+    /**
+     * Returns the hardware address of the local Bluetooth adapter.
+     * <p>For example, "00:11:22:AA:BB:CC".
+     *
+     * @return Bluetooth hardware address as string
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.LOCAL_MAC_ADDRESS,
+    })
+    public String getAddress() {
+        try {
+            return mManagerService.getAddress(mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return null;
+    }
+
+    /**
+     * Get the friendly Bluetooth name of the local Bluetooth adapter.
+     * <p>This name is visible to remote Bluetooth devices.
+     *
+     * @return the Bluetooth name, or null on error
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public String getName() {
+        try {
+            return mManagerService.getName(mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return null;
+    }
+
+    /** {@hide} */
+    @RequiresBluetoothAdvertisePermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_ADVERTISE)
+    public int getNameLengthForAdvertise() {
+        try {
+            return mService.getNameLengthForAdvertise(mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return -1;
+    }
+
+    /**
+     * Factory reset bluetooth settings.
+     *
+     * @return true to indicate that the config file was successfully cleared
+     * @hide
+     */
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean factoryReset() {
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null && mService.factoryReset(mAttributionSource)
+                    && mManagerService != null
+                    && mManagerService.onFactoryReset(mAttributionSource)) {
+                return true;
+            }
+            Log.e(TAG, "factoryReset(): Setting persist.bluetooth.factoryreset to retry later");
+            BluetoothProperties.factory_reset(true);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Get the UUIDs supported by the local Bluetooth adapter.
+     *
+     * @return the UUIDs supported by the local Bluetooth Adapter.
+     * @hide
+     */
+    @UnsupportedAppUsage
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public @Nullable ParcelUuid[] getUuids() {
+        if (getState() != STATE_ON) {
+            return null;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.getUuids(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return null;
+    }
+
+    /**
+     * Set the friendly Bluetooth name of the local Bluetooth adapter.
+     * <p>This name is visible to remote Bluetooth devices.
+     * <p>Valid Bluetooth names are a maximum of 248 bytes using UTF-8
+     * encoding, although many remote devices can only display the first
+     * 40 characters, and some may be limited to just 20.
+     * <p>If Bluetooth state is not {@link #STATE_ON}, this API
+     * will return false. After turning on Bluetooth,
+     * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
+     * to get the updated value.
+     *
+     * @param name a valid Bluetooth name
+     * @return true if the name was set, false otherwise
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean setName(String name) {
+        if (getState() != STATE_ON) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.setName(name, mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Returns the {@link BluetoothClass} Bluetooth Class of Device (CoD) of the local Bluetooth
+     * adapter.
+     *
+     * @return {@link BluetoothClass} Bluetooth CoD of local Bluetooth device.
+     *
+     * @hide
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothClass getBluetoothClass() {
+        if (getState() != STATE_ON) {
+            return null;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.getBluetoothClass(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return null;
+    }
+
+    /**
+     * Sets the {@link BluetoothClass} Bluetooth Class of Device (CoD) of the local Bluetooth
+     * adapter.
+     *
+     * <p>Note: This value persists across system reboot.
+     *
+     * @param bluetoothClass {@link BluetoothClass} to set the local Bluetooth adapter to.
+     * @return true if successful, false if unsuccessful.
+     *
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean setBluetoothClass(BluetoothClass bluetoothClass) {
+        if (getState() != STATE_ON) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.setBluetoothClass(bluetoothClass, mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Returns the Input/Output capability of the device for classic Bluetooth.
+     *
+     * @return Input/Output capability of the device. One of {@link #IO_CAPABILITY_OUT},
+     *         {@link #IO_CAPABILITY_IO}, {@link #IO_CAPABILITY_IN}, {@link #IO_CAPABILITY_NONE},
+     *         {@link #IO_CAPABILITY_KBDISP} or {@link #IO_CAPABILITY_UNKNOWN}.
+     *
+     * @hide
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @IoCapability
+    public int getIoCapability() {
+        if (getState() != STATE_ON) return BluetoothAdapter.IO_CAPABILITY_UNKNOWN;
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) return mService.getIoCapability(mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, e.getMessage(), e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return BluetoothAdapter.IO_CAPABILITY_UNKNOWN;
+    }
+
+    /**
+     * Sets the Input/Output capability of the device for classic Bluetooth.
+     *
+     * <p>Changing the Input/Output capability of a device only takes effect on restarting the
+     * Bluetooth stack. You would need to restart the stack using {@link BluetoothAdapter#disable()}
+     * and {@link BluetoothAdapter#enable()} to see the changes.
+     *
+     * @param capability Input/Output capability of the device. One of {@link #IO_CAPABILITY_OUT},
+     *                   {@link #IO_CAPABILITY_IO}, {@link #IO_CAPABILITY_IN},
+     *                   {@link #IO_CAPABILITY_NONE} or {@link #IO_CAPABILITY_KBDISP}.
+     *
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean setIoCapability(@IoCapability int capability) {
+        if (getState() != STATE_ON) return false;
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) return mService.setIoCapability(capability, mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, e.getMessage(), e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Returns the Input/Output capability of the device for BLE operations.
+     *
+     * @return Input/Output capability of the device. One of {@link #IO_CAPABILITY_OUT},
+     *         {@link #IO_CAPABILITY_IO}, {@link #IO_CAPABILITY_IN}, {@link #IO_CAPABILITY_NONE},
+     *         {@link #IO_CAPABILITY_KBDISP} or {@link #IO_CAPABILITY_UNKNOWN}.
+     *
+     * @hide
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @IoCapability
+    public int getLeIoCapability() {
+        if (getState() != STATE_ON) return BluetoothAdapter.IO_CAPABILITY_UNKNOWN;
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) return mService.getLeIoCapability(mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, e.getMessage(), e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return BluetoothAdapter.IO_CAPABILITY_UNKNOWN;
+    }
+
+    /**
+     * Sets the Input/Output capability of the device for BLE operations.
+     *
+     * <p>Changing the Input/Output capability of a device only takes effect on restarting the
+     * Bluetooth stack. You would need to restart the stack using {@link BluetoothAdapter#disable()}
+     * and {@link BluetoothAdapter#enable()} to see the changes.
+     *
+     * @param capability Input/Output capability of the device. One of {@link #IO_CAPABILITY_OUT},
+     *                   {@link #IO_CAPABILITY_IO}, {@link #IO_CAPABILITY_IN},
+     *                   {@link #IO_CAPABILITY_NONE} or {@link #IO_CAPABILITY_KBDISP}.
+     *
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean setLeIoCapability(@IoCapability int capability) {
+        if (getState() != STATE_ON) return false;
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) return mService.setLeIoCapability(capability, mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, e.getMessage(), e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Get the current Bluetooth scan mode of the local Bluetooth adapter.
+     * <p>The Bluetooth scan mode determines if the local adapter is
+     * connectable and/or discoverable from remote Bluetooth devices.
+     * <p>Possible values are:
+     * {@link #SCAN_MODE_NONE},
+     * {@link #SCAN_MODE_CONNECTABLE},
+     * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}.
+     * <p>If Bluetooth state is not {@link #STATE_ON}, this API
+     * will return {@link #SCAN_MODE_NONE}. After turning on Bluetooth,
+     * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
+     * to get the updated value.
+     *
+     * @return scan mode
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    @ScanMode
+    public int getScanMode() {
+        if (getState() != STATE_ON) {
+            return SCAN_MODE_NONE;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.getScanMode(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return SCAN_MODE_NONE;
+    }
+
+    /**
+     * Set the Bluetooth scan mode of the local Bluetooth adapter.
+     * <p>The Bluetooth scan mode determines if the local adapter is
+     * connectable and/or discoverable from remote Bluetooth devices.
+     * <p>For privacy reasons, discoverable mode is automatically turned off
+     * after <code>durationMillis</code> milliseconds. For example, 120000 milliseconds should be
+     * enough for a remote device to initiate and complete its discovery process.
+     * <p>Valid scan mode values are:
+     * {@link #SCAN_MODE_NONE},
+     * {@link #SCAN_MODE_CONNECTABLE},
+     * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}.
+     * <p>If Bluetooth state is not {@link #STATE_ON}, this API
+     * will return false. After turning on Bluetooth,
+     * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
+     * to get the updated value.
+     * <p>Applications cannot set the scan mode. They should use
+     * <code>startActivityForResult(
+     * BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE})
+     * </code>instead.
+     *
+     * @param mode valid scan mode
+     * @param durationMillis time in milliseconds to apply scan mode, only used for {@link
+     * #SCAN_MODE_CONNECTABLE_DISCOVERABLE}
+     * @return true if the scan mode was set, false otherwise
+     * @hide
+     */
+    @UnsupportedAppUsage(publicAlternatives = "Use {@link #ACTION_REQUEST_DISCOVERABLE}, which "
+            + "shows UI that confirms the user wants to go into discoverable mode.")
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public boolean setScanMode(@ScanMode int mode, long durationMillis) {
+        if (getState() != STATE_ON) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                int durationSeconds = Math.toIntExact(durationMillis / 1000);
+                return mService.setScanMode(mode, durationSeconds, mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } catch (ArithmeticException ex) {
+            Log.e(TAG, "setScanMode: Duration in seconds outside of the bounds of an int");
+            throw new IllegalArgumentException("Duration not in bounds. In seconds, the "
+                    + "durationMillis must be in the range of an int");
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Set the Bluetooth scan mode of the local Bluetooth adapter.
+     * <p>The Bluetooth scan mode determines if the local adapter is
+     * connectable and/or discoverable from remote Bluetooth devices.
+     * <p>For privacy reasons, discoverable mode is automatically turned off
+     * after <code>duration</code> seconds. For example, 120 seconds should be
+     * enough for a remote device to initiate and complete its discovery
+     * process.
+     * <p>Valid scan mode values are:
+     * {@link #SCAN_MODE_NONE},
+     * {@link #SCAN_MODE_CONNECTABLE},
+     * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}.
+     * <p>If Bluetooth state is not {@link #STATE_ON}, this API
+     * will return false. After turning on Bluetooth,
+     * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
+     * to get the updated value.
+     * <p>Applications cannot set the scan mode. They should use
+     * <code>startActivityForResult(
+     * BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE})
+     * </code>instead.
+     *
+     * @param mode valid scan mode
+     * @return true if the scan mode was set, false otherwise
+     * @hide
+     */
+    @UnsupportedAppUsage
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public boolean setScanMode(@ScanMode int mode) {
+        if (getState() != STATE_ON) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.setScanMode(mode, getDiscoverableTimeout(), mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /** @hide */
+    @UnsupportedAppUsage
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public int getDiscoverableTimeout() {
+        if (getState() != STATE_ON) {
+            return -1;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.getDiscoverableTimeout(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return -1;
+    }
+
+    /** @hide */
+    @UnsupportedAppUsage
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public void setDiscoverableTimeout(int timeout) {
+        if (getState() != STATE_ON) {
+            return;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                mService.setDiscoverableTimeout(timeout, mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+    }
+
+    /**
+     * Get the end time of the latest remote device discovery process.
+     *
+     * @return the latest time that the bluetooth adapter was/will be in discovery mode, in
+     * milliseconds since the epoch. This time can be in the future if {@link #startDiscovery()} has
+     * been called recently.
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public long getDiscoveryEndMillis() {
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.getDiscoveryEndMillis(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return -1;
+    }
+
+    /**
+     * Start the remote device discovery process.
+     * <p>The discovery process usually involves an inquiry scan of about 12
+     * seconds, followed by a page scan of each new device to retrieve its
+     * Bluetooth name.
+     * <p>This is an asynchronous call, it will return immediately. Register
+     * for {@link #ACTION_DISCOVERY_STARTED} and {@link
+     * #ACTION_DISCOVERY_FINISHED} intents to determine exactly when the
+     * discovery starts and completes. Register for {@link
+     * BluetoothDevice#ACTION_FOUND} to be notified as remote Bluetooth devices
+     * are found.
+     * <p>Device discovery is a heavyweight procedure. New connections to
+     * remote Bluetooth devices should not be attempted while discovery is in
+     * progress, and existing connections will experience limited bandwidth
+     * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing
+     * discovery. Discovery is not managed by the Activity,
+     * but is run as a system service, so an application should always call
+     * {@link BluetoothAdapter#cancelDiscovery()} even if it
+     * did not directly request a discovery, just to be sure.
+     * <p>Device discovery will only find remote devices that are currently
+     * <i>discoverable</i> (inquiry scan enabled). Many Bluetooth devices are
+     * not discoverable by default, and need to be entered into a special mode.
+     * <p>If Bluetooth state is not {@link #STATE_ON}, this API
+     * will return false. After turning on Bluetooth, wait for {@link #ACTION_STATE_CHANGED}
+     * with {@link #STATE_ON} to get the updated value.
+     * <p>If a device is currently bonding, this request will be queued and executed once that
+     * device has finished bonding. If a request is already queued, this request will be ignored.
+     *
+     * @return true on success, false on error
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothScanPermission
+    @RequiresBluetoothLocationPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public boolean startDiscovery() {
+        if (getState() != STATE_ON) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.startDiscovery(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Cancel the current device discovery process.
+     * <p>Because discovery is a heavyweight procedure for the Bluetooth
+     * adapter, this method should always be called before attempting to connect
+     * to a remote device with {@link
+     * android.bluetooth.BluetoothSocket#connect()}. Discovery is not managed by
+     * the  Activity, but is run as a system service, so an application should
+     * always call cancel discovery even if it did not directly request a
+     * discovery, just to be sure.
+     * <p>If Bluetooth state is not {@link #STATE_ON}, this API
+     * will return false. After turning on Bluetooth,
+     * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
+     * to get the updated value.
+     *
+     * @return true on success, false on error
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public boolean cancelDiscovery() {
+        if (getState() != STATE_ON) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.cancelDiscovery(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Return true if the local Bluetooth adapter is currently in the device
+     * discovery process.
+     * <p>Device discovery is a heavyweight procedure. New connections to
+     * remote Bluetooth devices should not be attempted while discovery is in
+     * progress, and existing connections will experience limited bandwidth
+     * and high latency. Use {@link #cancelDiscovery()} to cancel an ongoing
+     * discovery.
+     * <p>Applications can also register for {@link #ACTION_DISCOVERY_STARTED}
+     * or {@link #ACTION_DISCOVERY_FINISHED} to be notified when discovery
+     * starts or completes.
+     * <p>If Bluetooth state is not {@link #STATE_ON}, this API
+     * will return false. After turning on Bluetooth,
+     * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
+     * to get the updated value.
+     *
+     * @return true if discovering
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public boolean isDiscovering() {
+        if (getState() != STATE_ON) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isDiscovering(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Removes the active device for the grouping of @ActiveDeviceUse specified
+     *
+     * @param profiles represents the purpose for which we are setting this as the active device.
+     *                 Possible values are:
+     *                 {@link BluetoothAdapter#ACTIVE_DEVICE_AUDIO},
+     *                 {@link BluetoothAdapter#ACTIVE_DEVICE_PHONE_CALL},
+     *                 {@link BluetoothAdapter#ACTIVE_DEVICE_ALL}
+     * @return false on immediate error, true otherwise
+     * @throws IllegalArgumentException if device is null or profiles is not one of
+     * {@link ActiveDeviceUse}
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public boolean removeActiveDevice(@ActiveDeviceUse int profiles) {
+        if (profiles != ACTIVE_DEVICE_AUDIO && profiles != ACTIVE_DEVICE_PHONE_CALL
+                && profiles != ACTIVE_DEVICE_ALL) {
+            Log.e(TAG, "Invalid profiles param value in removeActiveDevice");
+            throw new IllegalArgumentException("Profiles must be one of "
+                    + "BluetoothAdapter.ACTIVE_DEVICE_AUDIO, "
+                    + "BluetoothAdapter.ACTIVE_DEVICE_PHONE_CALL, or "
+                    + "BluetoothAdapter.ACTIVE_DEVICE_ALL");
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                if (DBG) Log.d(TAG, "removeActiveDevice, profiles: " + profiles);
+                return mService.removeActiveDevice(profiles, mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+
+        return false;
+    }
+
+    /**
+     * Sets device as the active devices for the profiles passed into the function
+     *
+     * @param device is the remote bluetooth device
+     * @param profiles represents the purpose for which we are setting this as the active device.
+     *                 Possible values are:
+     *                 {@link BluetoothAdapter#ACTIVE_DEVICE_AUDIO},
+     *                 {@link BluetoothAdapter#ACTIVE_DEVICE_PHONE_CALL},
+     *                 {@link BluetoothAdapter#ACTIVE_DEVICE_ALL}
+     * @return false on immediate error, true otherwise
+     * @throws IllegalArgumentException if device is null or profiles is not one of
+     * {@link ActiveDeviceUse}
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public boolean setActiveDevice(@NonNull BluetoothDevice device,
+            @ActiveDeviceUse int profiles) {
+        if (device == null) {
+            Log.e(TAG, "setActiveDevice: Null device passed as parameter");
+            throw new IllegalArgumentException("device cannot be null");
+        }
+        if (profiles != ACTIVE_DEVICE_AUDIO && profiles != ACTIVE_DEVICE_PHONE_CALL
+                && profiles != ACTIVE_DEVICE_ALL) {
+            Log.e(TAG, "Invalid profiles param value in setActiveDevice");
+            throw new IllegalArgumentException("Profiles must be one of "
+                    + "BluetoothAdapter.ACTIVE_DEVICE_AUDIO, "
+                    + "BluetoothAdapter.ACTIVE_DEVICE_PHONE_CALL, or "
+                    + "BluetoothAdapter.ACTIVE_DEVICE_ALL");
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                if (DBG) {
+                    Log.d(TAG, "setActiveDevice, device: " + device + ", profiles: " + profiles);
+                }
+                return mService.setActiveDevice(device, profiles, mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the active devices for the BluetoothProfile specified
+     *
+     * @param profile is the profile from which we want the active devices.
+     *                Possible values are:
+     *                {@link BluetoothProfile#HEADSET},
+     *                {@link BluetoothProfile#A2DP},
+     *                {@link BluetoothProfile#HEARING_AID}
+     *                {@link BluetoothProfile#LE_AUDIO}
+     * @return A list of active bluetooth devices
+     * @throws IllegalArgumentException If profile is not one of {@link ActiveDeviceProfile}
+     * @hide
+     */
+    @SystemApi
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public @NonNull List<BluetoothDevice> getActiveDevices(@ActiveDeviceProfile int profile) {
+        if (profile != BluetoothProfile.HEADSET
+                && profile != BluetoothProfile.A2DP
+                && profile != BluetoothProfile.HEARING_AID
+                && profile != BluetoothProfile.LE_AUDIO) {
+            Log.e(TAG, "Invalid profile param value in getActiveDevices");
+            throw new IllegalArgumentException("Profiles must be one of "
+                    + "BluetoothProfile.A2DP, "
+                    + "BluetoothProfile.HEARING_AID, or"
+                    + "BluetoothProfile.HEARING_AID"
+                    + "BluetoothProfile.LE_AUDIO");
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                if (DBG) {
+                    Log.d(TAG, "getActiveDevices(profile= "
+                            + BluetoothProfile.getProfileName(profile) + ")");
+                }
+                return mService.getActiveDevices(profile, mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+
+        return new ArrayList<>();
+    }
+
+    /**
+     * Return true if the multi advertisement is supported by the chipset
+     *
+     * @return true if Multiple Advertisement feature is supported
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public boolean isMultipleAdvertisementSupported() {
+        if (getState() != STATE_ON) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isMultiAdvertisementSupported();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get isMultipleAdvertisementSupported, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Returns {@code true} if BLE scan is always available, {@code false} otherwise. <p>
+     *
+     * If this returns {@code true}, application can issue {@link BluetoothLeScanner#startScan} and
+     * fetch scan results even when Bluetooth is turned off.<p>
+     *
+     * To change this setting, use {@link #ACTION_REQUEST_BLE_SCAN_ALWAYS_AVAILABLE}.
+     *
+     * @hide
+     */
+    @SystemApi
+    @RequiresNoPermission
+    public boolean isBleScanAlwaysAvailable() {
+        try {
+            return mManagerService.isBleScanAlwaysAvailable();
+        } catch (RemoteException e) {
+            Log.e(TAG, "remote exception when calling isBleScanAlwaysAvailable", e);
+            return false;
+        }
+    }
+
+    /*
+    private static final String BLUETOOTH_FILTERING_CACHE_PROPERTY =
+            "cache_key.bluetooth.is_offloaded_filtering_supported";
+    private final PropertyInvalidatedCache<Void, Boolean> mBluetoothFilteringCache =
+            new PropertyInvalidatedCache<Void, Boolean>(
+                8, BLUETOOTH_FILTERING_CACHE_PROPERTY) {
+                @Override
+                @SuppressLint("AndroidFrameworkRequiresPermission")
+                protected Boolean recompute(Void query) {
+                    try {
+                        mServiceLock.readLock().lock();
+                        if (mService != null) {
+                            return mService.isOffloadedFilteringSupported();
+                        }
+                    } catch (RemoteException e) {
+                        Log.e(TAG, "failed to get isOffloadedFilteringSupported, error: ", e);
+                    } finally {
+                        mServiceLock.readLock().unlock();
+                    }
+                    return false;
+
+                }
+            };
+     */
+
+    /** @hide */
+    /*
+    @RequiresNoPermission
+    public void disableIsOffloadedFilteringSupportedCache() {
+        mBluetoothFilteringCache.disableLocal();
+    }
+     */
+
+    /** @hide */
+    /*
+    public static void invalidateIsOffloadedFilteringSupportedCache() {
+        PropertyInvalidatedCache.invalidateCache(BLUETOOTH_FILTERING_CACHE_PROPERTY);
+    }
+     */
+
+    /**
+     * Return true if offloaded filters are supported
+     *
+     * @return true if chipset supports on-chip filtering
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public boolean isOffloadedFilteringSupported() {
+        if (!getLeAccess()) {
+            return false;
+        }
+        //return mBluetoothFilteringCache.query(null);
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isOffloadedFilteringSupported();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get isOffloadedFilteringSupported, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Return true if offloaded scan batching is supported
+     *
+     * @return true if chipset supports on-chip scan batching
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public boolean isOffloadedScanBatchingSupported() {
+        if (!getLeAccess()) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isOffloadedScanBatchingSupported();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get isOffloadedScanBatchingSupported, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Return true if LE 2M PHY feature is supported.
+     *
+     * @return true if chipset supports LE 2M PHY feature
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public boolean isLe2MPhySupported() {
+        if (!getLeAccess()) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isLe2MPhySupported();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get isExtendedAdvertisingSupported, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Return true if LE Coded PHY feature is supported.
+     *
+     * @return true if chipset supports LE Coded PHY feature
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public boolean isLeCodedPhySupported() {
+        if (!getLeAccess()) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isLeCodedPhySupported();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get isLeCodedPhySupported, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Return true if LE Extended Advertising feature is supported.
+     *
+     * @return true if chipset supports LE Extended Advertising feature
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public boolean isLeExtendedAdvertisingSupported() {
+        if (!getLeAccess()) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isLeExtendedAdvertisingSupported();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get isLeExtendedAdvertisingSupported, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /**
+     * Return true if LE Periodic Advertising feature is supported.
+     *
+     * @return true if chipset supports LE Periodic Advertising feature
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public boolean isLePeriodicAdvertisingSupported() {
+        if (!getLeAccess()) {
+            return false;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isLePeriodicAdvertisingSupported();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get isLePeriodicAdvertisingSupported, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return false;
+    }
+
+    /** @hide */
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef(value = {
+            BluetoothStatusCodes.SUCCESS,
+            BluetoothStatusCodes.ERROR_UNKNOWN,
+            BluetoothStatusCodes.ERROR_BLUETOOTH_NOT_ENABLED,
+            BluetoothStatusCodes.ERROR_FEATURE_NOT_SUPPORTED,
+    })
+    public @interface LeFeatureReturnValues {}
+
+    /**
+     * Returns {@link BluetoothStatusCodes#SUCCESS} if the LE audio feature is
+     * supported, returns {@link BluetoothStatusCodes#ERROR_FEATURE_NOT_SUPPORTED} if
+     * the feature is not supported or an error code.
+     *
+     * @return whether the LE audio is supported
+     */
+    @RequiresNoPermission
+    public @LeFeatureReturnValues int isLeAudioSupported() {
+        if (!getLeAccess()) {
+            return BluetoothStatusCodes.ERROR_BLUETOOTH_NOT_ENABLED;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isLeAudioSupported();
+            }
+        } catch (RemoteException e) {
+            e.rethrowFromSystemServer();
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return BluetoothStatusCodes.ERROR_UNKNOWN;
+    }
+
+    /**
+     * Returns {@link BluetoothStatusCodes#SUCCESS} if LE Periodic Advertising Sync Transfer Sender
+     * feature is supported, returns {@link BluetoothStatusCodes#ERROR_FEATURE_NOT_SUPPORTED} if the
+     * feature is not supported or an error code
+     *
+     * @return whether the chipset supports the LE Periodic Advertising Sync Transfer Sender feature
+     */
+    @RequiresNoPermission
+    public @LeFeatureReturnValues int isLePeriodicAdvertisingSyncTransferSenderSupported() {
+        if (!getLeAccess()) {
+            return BluetoothStatusCodes.ERROR_BLUETOOTH_NOT_ENABLED;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.isLePeriodicAdvertisingSyncTransferSenderSupported();
+            }
+        } catch (RemoteException e) {
+            e.rethrowFromSystemServer();
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return BluetoothStatusCodes.ERROR_UNKNOWN;
+    }
+
+    /**
+     * Return the maximum LE advertising data length in bytes,
+     * if LE Extended Advertising feature is supported, 0 otherwise.
+     *
+     * @return the maximum LE advertising data length.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public int getLeMaximumAdvertisingDataLength() {
+        if (!getLeAccess()) {
+            return 0;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.getLeMaximumAdvertisingDataLength();
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get getLeMaximumAdvertisingDataLength, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return 0;
+    }
+
+    /**
+     * Return true if Hearing Aid Profile is supported.
+     *
+     * @return true if phone supports Hearing Aid Profile
+     */
+    @RequiresNoPermission
+    private boolean isHearingAidProfileSupported() {
+        try {
+            return mManagerService.isHearingAidProfileSupported();
+        } catch (RemoteException e) {
+            Log.e(TAG, "remote exception when calling isHearingAidProfileSupported", e);
+            return false;
+        }
+    }
+
+    /**
+     * Get the maximum number of connected audio devices.
+     *
+     * @return the maximum number of connected audio devices
+     * @hide
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public int getMaxConnectedAudioDevices() {
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.getMaxConnectedAudioDevices(mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to get getMaxConnectedAudioDevices, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return 1;
+    }
+
+    /**
+     * Return true if hardware has entries available for matching beacons
+     *
+     * @return true if there are hw entries available for matching beacons
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean isHardwareTrackingFiltersAvailable() {
+        if (!getLeAccess()) {
+            return false;
+        }
+        try {
+            IBluetoothGatt iGatt = mManagerService.getBluetoothGatt();
+            if (iGatt == null) {
+                // BLE is not supported
+                return false;
+            }
+            return (iGatt.numHwTrackFiltersAvailable(mAttributionSource) != 0);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return false;
+    }
+
+    /**
+     * Request the record of {@link BluetoothActivityEnergyInfo} object that
+     * has the activity and energy info. This can be used to ascertain what
+     * the controller has been up to, since the last sample.
+     *
+     * A null value for the activity info object may be sent if the bluetooth service is
+     * unreachable or the device does not support reporting such information.
+     *
+     * @param result The callback to which to send the activity info.
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public void requestControllerActivityEnergyInfo(ResultReceiver result) {
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                mService.requestActivityInfo(result, mAttributionSource);
+                result = null;
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "getControllerActivityEnergyInfoCallback: " + e);
+        } finally {
+            mServiceLock.readLock().unlock();
+            if (result != null) {
+                // Only send an immediate result if we failed.
+                result.send(0, null);
+            }
+        }
+    }
+
+    /**
+     * Fetches a list of the most recently connected bluetooth devices ordered by how recently they
+     * were connected with most recently first and least recently last
+     *
+     * @return {@link List} of bonded {@link BluetoothDevice} ordered by how recently they were
+     * connected
+     *
+     * @hide
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public @NonNull List<BluetoothDevice> getMostRecentlyConnectedDevices() {
+        if (getState() != STATE_ON) {
+            return new ArrayList<>();
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return Attributable.setAttributionSource(
+                        mService.getMostRecentlyConnectedDevices(mAttributionSource),
+                        mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return new ArrayList<>();
+    }
+
+    /**
+     * Return the set of {@link BluetoothDevice} objects that are bonded
+     * (paired) to the local adapter.
+     * <p>If Bluetooth state is not {@link #STATE_ON}, this API
+     * will return an empty set. After turning on Bluetooth,
+     * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
+     * to get the updated value.
+     *
+     * @return unmodifiable set of {@link BluetoothDevice}, or null on error
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public Set<BluetoothDevice> getBondedDevices() {
+        if (getState() != STATE_ON) {
+            return toDeviceSet(Arrays.asList());
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return toDeviceSet(Attributable.setAttributionSource(
+                        Arrays.asList(mService.getBondedDevices(mAttributionSource)),
+                        mAttributionSource));
+            }
+            return toDeviceSet(Arrays.asList());
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return null;
+    }
+
+    /**
+     * Gets the currently supported profiles by the adapter.
+     *
+     * <p> This can be used to check whether a profile is supported before attempting
+     * to connect to its respective proxy.
+     *
+     * @return a list of integers indicating the ids of supported profiles as defined in {@link
+     * BluetoothProfile}.
+     * @hide
+     */
+    @RequiresNoPermission
+    public @NonNull List<Integer> getSupportedProfiles() {
+        final ArrayList<Integer> supportedProfiles = new ArrayList<Integer>();
+
+        try {
+            synchronized (mManagerCallback) {
+                if (mService != null) {
+                    final long supportedProfilesBitMask = mService.getSupportedProfiles();
+
+                    for (int i = 0; i <= BluetoothProfile.MAX_PROFILE_ID; i++) {
+                        if ((supportedProfilesBitMask & (1 << i)) != 0) {
+                            supportedProfiles.add(i);
+                        }
+                    }
+                } else {
+                    // Bluetooth is disabled. Just fill in known supported Profiles
+                    if (isHearingAidProfileSupported()) {
+                        supportedProfiles.add(BluetoothProfile.HEARING_AID);
+                    }
+                }
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "getSupportedProfiles:", e);
+        }
+        return supportedProfiles;
+    }
+
+    /*
+    private static final String BLUETOOTH_GET_ADAPTER_CONNECTION_STATE_CACHE_PROPERTY =
+            "cache_key.bluetooth.get_adapter_connection_state";
+    private final PropertyInvalidatedCache<Void, Integer>
+            mBluetoothGetAdapterConnectionStateCache =
+            new PropertyInvalidatedCache<Void, Integer> (
+                8, BLUETOOTH_GET_ADAPTER_CONNECTION_STATE_CACHE_PROPERTY) {
+                @Override
+                @SuppressLint("AndroidFrameworkRequiresPermission")
+                protected Integer recompute(Void query) {
+                    try {
+                        return mService.getAdapterConnectionState();
+                    } catch (RemoteException e) {
+                        throw e.rethrowAsRuntimeException();
+                    }
+                }
+            };
+     */
+
+    /** @hide */
+    /*
+    @RequiresNoPermission
+    public void disableGetAdapterConnectionStateCache() {
+        mBluetoothGetAdapterConnectionStateCache.disableLocal();
+    }
+     */
+
+    /** @hide */
+    /*
+    public static void invalidateGetAdapterConnectionStateCache() {
+        PropertyInvalidatedCache.invalidateCache(
+            BLUETOOTH_GET_ADAPTER_CONNECTION_STATE_CACHE_PROPERTY);
+    }
+     */
+
+    /**
+     * Get the current connection state of the local Bluetooth adapter.
+     * This can be used to check whether the local Bluetooth adapter is connected
+     * to any profile of any other remote Bluetooth Device.
+     *
+     * <p> Use this function along with {@link #ACTION_CONNECTION_STATE_CHANGED}
+     * intent to get the connection state of the adapter.
+     *
+     * @return One of {@link #STATE_CONNECTED}, {@link #STATE_DISCONNECTED}, {@link
+     * #STATE_CONNECTING} or {@link #STATE_DISCONNECTED}
+     * @hide
+     */
+    @UnsupportedAppUsage
+    @RequiresLegacyBluetoothPermission
+    @RequiresNoPermission
+    public int getConnectionState() {
+        if (getState() != STATE_ON) {
+            return BluetoothAdapter.STATE_DISCONNECTED;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.getAdapterConnectionState();
+            }
+            //return mBluetoothGetAdapterConnectionStateCache.query(null);
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to getConnectionState, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return BluetoothAdapter.STATE_DISCONNECTED;
+    }
+
+    /*
+    private static final String BLUETOOTH_PROFILE_CACHE_PROPERTY =
+            "cache_key.bluetooth.get_profile_connection_state";
+    private final PropertyInvalidatedCache<Integer, Integer>
+            mGetProfileConnectionStateCache =
+            new PropertyInvalidatedCache<Integer, Integer>(
+                8, BLUETOOTH_PROFILE_CACHE_PROPERTY) {
+                @Override
+                @SuppressLint("AndroidFrameworkRequiresPermission")
+                protected Integer recompute(Integer query) {
+                    try {
+                        mServiceLock.readLock().lock();
+                        if (mService != null) {
+                            return mService.getProfileConnectionState(query);
+                        }
+                    } catch (RemoteException e) {
+                        Log.e(TAG, "getProfileConnectionState:", e);
+                    } finally {
+                        mServiceLock.readLock().unlock();
+                    }
+                    return BluetoothProfile.STATE_DISCONNECTED;
+                }
+                @Override
+                public String queryToString(Integer query) {
+                    return String.format("getProfileConnectionState(profile=\"%d\")",
+                                         query);
+                }
+            };
+     */
+
+    /** @hide */
+    /*
+    @RequiresNoPermission
+    public void disableGetProfileConnectionStateCache() {
+        mGetProfileConnectionStateCache.disableLocal();
+    }
+     */
+
+    /** @hide */
+    /*
+    public static void invalidateGetProfileConnectionStateCache() {
+        PropertyInvalidatedCache.invalidateCache(BLUETOOTH_PROFILE_CACHE_PROPERTY);
+    }
+     */
+
+    /**
+     * Get the current connection state of a profile.
+     * This function can be used to check whether the local Bluetooth adapter
+     * is connected to any remote device for a specific profile.
+     * Profile can be one of {@link BluetoothProfile#HEADSET}, {@link BluetoothProfile#A2DP}.
+     *
+     * <p> Return value can be one of
+     * {@link BluetoothProfile#STATE_DISCONNECTED},
+     * {@link BluetoothProfile#STATE_CONNECTING},
+     * {@link BluetoothProfile#STATE_CONNECTED},
+     * {@link BluetoothProfile#STATE_DISCONNECTING}
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SuppressLint("AndroidFrameworkRequiresPermission")
+    public int getProfileConnectionState(int profile) {
+        if (getState() != STATE_ON) {
+            return BluetoothProfile.STATE_DISCONNECTED;
+        }
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                mService.getProfileConnectionState(profile);
+            }
+            //return mGetProfileConnectionStateCache.query(new Integer(profile));
+        } catch (RemoteException e) {
+            Log.e(TAG, "failed to getProfileConnectionState, error: ", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+        return BluetoothProfile.STATE_DISCONNECTED;
+    }
+
+    /**
+     * Create a listening, secure RFCOMM Bluetooth socket.
+     * <p>A remote device connecting to this socket will be authenticated and
+     * communication on this socket will be encrypted.
+     * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming
+     * connections from a listening {@link BluetoothServerSocket}.
+     * <p>Valid RFCOMM channels are in range 1 to 30.
+     *
+     * @param channel RFCOMM channel to listen on
+     * @return a listening RFCOMM BluetoothServerSocket
+     * @throws IOException on error, for example Bluetooth not available, or insufficient
+     * permissions, or channel in use.
+     * @hide
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingRfcommOn(int channel) throws IOException {
+        return listenUsingRfcommOn(channel, false, false);
+    }
+
+    /**
+     * Create a listening, secure RFCOMM Bluetooth socket.
+     * <p>A remote device connecting to this socket will be authenticated and
+     * communication on this socket will be encrypted.
+     * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming
+     * connections from a listening {@link BluetoothServerSocket}.
+     * <p>Valid RFCOMM channels are in range 1 to 30.
+     * <p>To auto assign a channel without creating a SDP record use
+     * {@link #SOCKET_CHANNEL_AUTO_STATIC_NO_SDP} as channel number.
+     *
+     * @param channel RFCOMM channel to listen on
+     * @param mitm enforce person-in-the-middle protection for authentication.
+     * @param min16DigitPin enforce a pin key length og minimum 16 digit for sec mode 2
+     * connections.
+     * @return a listening RFCOMM BluetoothServerSocket
+     * @throws IOException on error, for example Bluetooth not available, or insufficient
+     * permissions, or channel in use.
+     * @hide
+     */
+    @UnsupportedAppUsage
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingRfcommOn(int channel, boolean mitm,
+            boolean min16DigitPin) throws IOException {
+        BluetoothServerSocket socket =
+                new BluetoothServerSocket(BluetoothSocket.TYPE_RFCOMM, true, true, channel, mitm,
+                        min16DigitPin);
+        int errno = socket.mSocket.bindListen();
+        if (channel == SOCKET_CHANNEL_AUTO_STATIC_NO_SDP) {
+            socket.setChannel(socket.mSocket.getPort());
+        }
+        if (errno != 0) {
+            //TODO(BT): Throw the same exception error code
+            // that the previous code was using.
+            //socket.mSocket.throwErrnoNative(errno);
+            throw new IOException("Error: " + errno);
+        }
+        return socket;
+    }
+
+    /**
+     * Create a listening, secure RFCOMM Bluetooth socket with Service Record.
+     * <p>A remote device connecting to this socket will be authenticated and
+     * communication on this socket will be encrypted.
+     * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming
+     * connections from a listening {@link BluetoothServerSocket}.
+     * <p>The system will assign an unused RFCOMM channel to listen on.
+     * <p>The system will also register a Service Discovery
+     * Protocol (SDP) record with the local SDP server containing the specified
+     * UUID, service name, and auto-assigned channel. Remote Bluetooth devices
+     * can use the same UUID to query our SDP server and discover which channel
+     * to connect to. This SDP record will be removed when this socket is
+     * closed, or if this application closes unexpectedly.
+     * <p>Use {@link BluetoothDevice#createRfcommSocketToServiceRecord} to
+     * connect to this socket from another device using the same {@link UUID}.
+     *
+     * @param name service name for SDP record
+     * @param uuid uuid for SDP record
+     * @return a listening RFCOMM BluetoothServerSocket
+     * @throws IOException on error, for example Bluetooth not available, or insufficient
+     * permissions, or channel in use.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingRfcommWithServiceRecord(String name, UUID uuid)
+            throws IOException {
+        return createNewRfcommSocketAndRecord(name, uuid, true, true);
+    }
+
+    /**
+     * Create a listening, insecure RFCOMM Bluetooth socket with Service Record.
+     * <p>The link key is not required to be authenticated, i.e the communication may be
+     * vulnerable to Person In the Middle attacks. For Bluetooth 2.1 devices,
+     * the link will be encrypted, as encryption is mandatory.
+     * For legacy devices (pre Bluetooth 2.1 devices) the link will not
+     * be encrypted. Use {@link #listenUsingRfcommWithServiceRecord}, if an
+     * encrypted and authenticated communication channel is desired.
+     * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming
+     * connections from a listening {@link BluetoothServerSocket}.
+     * <p>The system will assign an unused RFCOMM channel to listen on.
+     * <p>The system will also register a Service Discovery
+     * Protocol (SDP) record with the local SDP server containing the specified
+     * UUID, service name, and auto-assigned channel. Remote Bluetooth devices
+     * can use the same UUID to query our SDP server and discover which channel
+     * to connect to. This SDP record will be removed when this socket is
+     * closed, or if this application closes unexpectedly.
+     * <p>Use {@link BluetoothDevice#createRfcommSocketToServiceRecord} to
+     * connect to this socket from another device using the same {@link UUID}.
+     *
+     * @param name service name for SDP record
+     * @param uuid uuid for SDP record
+     * @return a listening RFCOMM BluetoothServerSocket
+     * @throws IOException on error, for example Bluetooth not available, or insufficient
+     * permissions, or channel in use.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingInsecureRfcommWithServiceRecord(String name, UUID uuid)
+            throws IOException {
+        return createNewRfcommSocketAndRecord(name, uuid, false, false);
+    }
+
+    /**
+     * Create a listening, encrypted,
+     * RFCOMM Bluetooth socket with Service Record.
+     * <p>The link will be encrypted, but the link key is not required to be authenticated
+     * i.e the communication is vulnerable to Person In the Middle attacks. Use
+     * {@link #listenUsingRfcommWithServiceRecord}, to ensure an authenticated link key.
+     * <p> Use this socket if authentication of link key is not possible.
+     * For example, for Bluetooth 2.1 devices, if any of the devices does not have
+     * an input and output capability or just has the ability to display a numeric key,
+     * a secure socket connection is not possible and this socket can be used.
+     * Use {@link #listenUsingInsecureRfcommWithServiceRecord}, if encryption is not required.
+     * For Bluetooth 2.1 devices, the link will be encrypted, as encryption is mandatory.
+     * For more details, refer to the Security Model section 5.2 (vol 3) of
+     * Bluetooth Core Specification version 2.1 + EDR.
+     * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming
+     * connections from a listening {@link BluetoothServerSocket}.
+     * <p>The system will assign an unused RFCOMM channel to listen on.
+     * <p>The system will also register a Service Discovery
+     * Protocol (SDP) record with the local SDP server containing the specified
+     * UUID, service name, and auto-assigned channel. Remote Bluetooth devices
+     * can use the same UUID to query our SDP server and discover which channel
+     * to connect to. This SDP record will be removed when this socket is
+     * closed, or if this application closes unexpectedly.
+     * <p>Use {@link BluetoothDevice#createRfcommSocketToServiceRecord} to
+     * connect to this socket from another device using the same {@link UUID}.
+     *
+     * @param name service name for SDP record
+     * @param uuid uuid for SDP record
+     * @return a listening RFCOMM BluetoothServerSocket
+     * @throws IOException on error, for example Bluetooth not available, or insufficient
+     * permissions, or channel in use.
+     * @hide
+     */
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingEncryptedRfcommWithServiceRecord(String name, UUID uuid)
+            throws IOException {
+        return createNewRfcommSocketAndRecord(name, uuid, false, true);
+    }
+
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    private BluetoothServerSocket createNewRfcommSocketAndRecord(String name, UUID uuid,
+            boolean auth, boolean encrypt) throws IOException {
+        BluetoothServerSocket socket;
+        socket = new BluetoothServerSocket(BluetoothSocket.TYPE_RFCOMM, auth, encrypt,
+                new ParcelUuid(uuid));
+        socket.setServiceName(name);
+        int errno = socket.mSocket.bindListen();
+        if (errno != 0) {
+            //TODO(BT): Throw the same exception error code
+            // that the previous code was using.
+            //socket.mSocket.throwErrnoNative(errno);
+            throw new IOException("Error: " + errno);
+        }
+        return socket;
+    }
+
+    /**
+     * Construct an unencrypted, unauthenticated, RFCOMM server socket.
+     * Call #accept to retrieve connections to this socket.
+     *
+     * @return An RFCOMM BluetoothServerSocket
+     * @throws IOException On error, for example Bluetooth not available, or insufficient
+     * permissions.
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingInsecureRfcommOn(int port) throws IOException {
+        BluetoothServerSocket socket =
+                new BluetoothServerSocket(BluetoothSocket.TYPE_RFCOMM, false, false, port);
+        int errno = socket.mSocket.bindListen();
+        if (port == SOCKET_CHANNEL_AUTO_STATIC_NO_SDP) {
+            socket.setChannel(socket.mSocket.getPort());
+        }
+        if (errno != 0) {
+            //TODO(BT): Throw the same exception error code
+            // that the previous code was using.
+            //socket.mSocket.throwErrnoNative(errno);
+            throw new IOException("Error: " + errno);
+        }
+        return socket;
+    }
+
+    /**
+     * Construct an encrypted, authenticated, L2CAP server socket.
+     * Call #accept to retrieve connections to this socket.
+     * <p>To auto assign a port without creating a SDP record use
+     * {@link #SOCKET_CHANNEL_AUTO_STATIC_NO_SDP} as port number.
+     *
+     * @param port the PSM to listen on
+     * @param mitm enforce person-in-the-middle protection for authentication.
+     * @param min16DigitPin enforce a pin key length og minimum 16 digit for sec mode 2
+     * connections.
+     * @return An L2CAP BluetoothServerSocket
+     * @throws IOException On error, for example Bluetooth not available, or insufficient
+     * permissions.
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingL2capOn(int port, boolean mitm, boolean min16DigitPin)
+            throws IOException {
+        BluetoothServerSocket socket =
+                new BluetoothServerSocket(BluetoothSocket.TYPE_L2CAP, true, true, port, mitm,
+                        min16DigitPin);
+        int errno = socket.mSocket.bindListen();
+        if (port == SOCKET_CHANNEL_AUTO_STATIC_NO_SDP) {
+            int assignedChannel = socket.mSocket.getPort();
+            if (DBG) Log.d(TAG, "listenUsingL2capOn: set assigned channel to " + assignedChannel);
+            socket.setChannel(assignedChannel);
+        }
+        if (errno != 0) {
+            //TODO(BT): Throw the same exception error code
+            // that the previous code was using.
+            //socket.mSocket.throwErrnoNative(errno);
+            throw new IOException("Error: " + errno);
+        }
+        return socket;
+    }
+
+    /**
+     * Construct an encrypted, authenticated, L2CAP server socket.
+     * Call #accept to retrieve connections to this socket.
+     * <p>To auto assign a port without creating a SDP record use
+     * {@link #SOCKET_CHANNEL_AUTO_STATIC_NO_SDP} as port number.
+     *
+     * @param port the PSM to listen on
+     * @return An L2CAP BluetoothServerSocket
+     * @throws IOException On error, for example Bluetooth not available, or insufficient
+     * permissions.
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingL2capOn(int port) throws IOException {
+        return listenUsingL2capOn(port, false, false);
+    }
+
+    /**
+     * Construct an insecure L2CAP server socket.
+     * Call #accept to retrieve connections to this socket.
+     * <p>To auto assign a port without creating a SDP record use
+     * {@link #SOCKET_CHANNEL_AUTO_STATIC_NO_SDP} as port number.
+     *
+     * @param port the PSM to listen on
+     * @return An L2CAP BluetoothServerSocket
+     * @throws IOException On error, for example Bluetooth not available, or insufficient
+     * permissions.
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothServerSocket listenUsingInsecureL2capOn(int port) throws IOException {
+        Log.d(TAG, "listenUsingInsecureL2capOn: port=" + port);
+        BluetoothServerSocket socket =
+                new BluetoothServerSocket(BluetoothSocket.TYPE_L2CAP, false, false, port, false,
+                                          false);
+        int errno = socket.mSocket.bindListen();
+        if (port == SOCKET_CHANNEL_AUTO_STATIC_NO_SDP) {
+            int assignedChannel = socket.mSocket.getPort();
+            if (DBG) {
+                Log.d(TAG, "listenUsingInsecureL2capOn: set assigned channel to "
+                        + assignedChannel);
+            }
+            socket.setChannel(assignedChannel);
+        }
+        if (errno != 0) {
+            //TODO(BT): Throw the same exception error code
+            // that the previous code was using.
+            //socket.mSocket.throwErrnoNative(errno);
+            throw new IOException("Error: " + errno);
+        }
+        return socket;
+
+    }
+
+    /**
+     * Read the local Out of Band Pairing Data
+     *
+     * @return Pair<byte[], byte[]> of Hash and Randomizer
+     * @hide
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SuppressLint("AndroidFrameworkRequiresPermission")
+    public Pair<byte[], byte[]> readOutOfBandData() {
+        return null;
+    }
+
+    /**
+     * Get the profile proxy object associated with the profile.
+     *
+     * <p>Profile can be one of {@link BluetoothProfile#HEADSET}, {@link BluetoothProfile#A2DP},
+     * {@link BluetoothProfile#GATT}, {@link BluetoothProfile#HEARING_AID}, or {@link
+     * BluetoothProfile#GATT_SERVER}. Clients must implement {@link
+     * BluetoothProfile.ServiceListener} to get notified of the connection status and to get the
+     * proxy object.
+     *
+     * @param context Context of the application
+     * @param listener The service Listener for connection callbacks.
+     * @param profile The Bluetooth profile; either {@link BluetoothProfile#HEADSET},
+     * {@link BluetoothProfile#A2DP}, {@link BluetoothProfile#GATT}, {@link
+     * BluetoothProfile#HEARING_AID} or {@link BluetoothProfile#GATT_SERVER}.
+     * @return true on success, false on error
+     */
+    @SuppressLint({
+        "AndroidFrameworkRequiresPermission",
+        "AndroidFrameworkBluetoothPermission"
+    })
+    public boolean getProfileProxy(Context context, BluetoothProfile.ServiceListener listener,
+            int profile) {
+        if (context == null || listener == null) {
+            return false;
+        }
+
+        if (profile == BluetoothProfile.HEADSET) {
+            BluetoothHeadset headset = new BluetoothHeadset(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.A2DP) {
+            BluetoothA2dp a2dp = new BluetoothA2dp(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.A2DP_SINK) {
+            BluetoothA2dpSink a2dpSink = new BluetoothA2dpSink(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.AVRCP_CONTROLLER) {
+            BluetoothAvrcpController avrcp = new BluetoothAvrcpController(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.HID_HOST) {
+            BluetoothHidHost iDev = new BluetoothHidHost(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.PAN) {
+            BluetoothPan pan = new BluetoothPan(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.PBAP) {
+            BluetoothPbap pbap = new BluetoothPbap(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.HEALTH) {
+            Log.e(TAG, "getProfileProxy(): BluetoothHealth is deprecated");
+            return false;
+        } else if (profile == BluetoothProfile.MAP) {
+            BluetoothMap map = new BluetoothMap(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.HEADSET_CLIENT) {
+            BluetoothHeadsetClient headsetClient =
+                    new BluetoothHeadsetClient(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.SAP) {
+            BluetoothSap sap = new BluetoothSap(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.PBAP_CLIENT) {
+            BluetoothPbapClient pbapClient = new BluetoothPbapClient(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.MAP_CLIENT) {
+            BluetoothMapClient mapClient = new BluetoothMapClient(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.HID_DEVICE) {
+            BluetoothHidDevice hidDevice = new BluetoothHidDevice(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.HEARING_AID) {
+            if (isHearingAidProfileSupported()) {
+                BluetoothHearingAid hearingAid = new BluetoothHearingAid(context, listener, this);
+                return true;
+            }
+            return false;
+        } else if (profile == BluetoothProfile.VOLUME_CONTROL) {
+            BluetoothVolumeControl vcs = new BluetoothVolumeControl(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.CSIP_SET_COORDINATOR) {
+            BluetoothCsipSetCoordinator csipSetCoordinator =
+                    new BluetoothCsipSetCoordinator(context, listener, this);
+            return true;
+        } else if (profile == BluetoothProfile.LE_CALL_CONTROL) {
+            BluetoothLeCallControl tbs = new BluetoothLeCallControl(context, listener);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Close the connection of the profile proxy to the Service.
+     *
+     * <p> Clients should call this when they are no longer using
+     * the proxy obtained from {@link #getProfileProxy}.
+     * Profile can be one of  {@link BluetoothProfile#HEADSET} or {@link BluetoothProfile#A2DP}
+     *
+     * @param profile
+     * @param proxy Profile proxy object
+     */
+    @SuppressLint({
+            "AndroidFrameworkRequiresPermission",
+            "AndroidFrameworkBluetoothPermission"
+    })
+    public void closeProfileProxy(int profile, BluetoothProfile proxy) {
+        if (proxy == null) {
+            return;
+        }
+
+        switch (profile) {
+            case BluetoothProfile.HEADSET:
+                BluetoothHeadset headset = (BluetoothHeadset) proxy;
+                headset.close();
+                break;
+            case BluetoothProfile.A2DP:
+                BluetoothA2dp a2dp = (BluetoothA2dp) proxy;
+                a2dp.close();
+                break;
+            case BluetoothProfile.A2DP_SINK:
+                BluetoothA2dpSink a2dpSink = (BluetoothA2dpSink) proxy;
+                a2dpSink.close();
+                break;
+            case BluetoothProfile.AVRCP_CONTROLLER:
+                BluetoothAvrcpController avrcp = (BluetoothAvrcpController) proxy;
+                avrcp.close();
+                break;
+            case BluetoothProfile.HID_HOST:
+                BluetoothHidHost iDev = (BluetoothHidHost) proxy;
+                iDev.close();
+                break;
+            case BluetoothProfile.PAN:
+                BluetoothPan pan = (BluetoothPan) proxy;
+                pan.close();
+                break;
+            case BluetoothProfile.PBAP:
+                BluetoothPbap pbap = (BluetoothPbap) proxy;
+                pbap.close();
+                break;
+            case BluetoothProfile.GATT:
+                BluetoothGatt gatt = (BluetoothGatt) proxy;
+                gatt.close();
+                break;
+            case BluetoothProfile.GATT_SERVER:
+                BluetoothGattServer gattServer = (BluetoothGattServer) proxy;
+                gattServer.close();
+                break;
+            case BluetoothProfile.MAP:
+                BluetoothMap map = (BluetoothMap) proxy;
+                map.close();
+                break;
+            case BluetoothProfile.HEADSET_CLIENT:
+                BluetoothHeadsetClient headsetClient = (BluetoothHeadsetClient) proxy;
+                headsetClient.close();
+                break;
+            case BluetoothProfile.SAP:
+                BluetoothSap sap = (BluetoothSap) proxy;
+                sap.close();
+                break;
+            case BluetoothProfile.PBAP_CLIENT:
+                BluetoothPbapClient pbapClient = (BluetoothPbapClient) proxy;
+                pbapClient.close();
+                break;
+            case BluetoothProfile.MAP_CLIENT:
+                BluetoothMapClient mapClient = (BluetoothMapClient) proxy;
+                mapClient.close();
+                break;
+            case BluetoothProfile.HID_DEVICE:
+                BluetoothHidDevice hidDevice = (BluetoothHidDevice) proxy;
+                hidDevice.close();
+                break;
+            case BluetoothProfile.HEARING_AID:
+                BluetoothHearingAid hearingAid = (BluetoothHearingAid) proxy;
+                hearingAid.close();
+                break;
+            case BluetoothProfile.VOLUME_CONTROL:
+                BluetoothVolumeControl vcs = (BluetoothVolumeControl) proxy;
+                vcs.close();
+                break;
+            case BluetoothProfile.CSIP_SET_COORDINATOR:
+                BluetoothCsipSetCoordinator csipSetCoordinator =
+                        (BluetoothCsipSetCoordinator) proxy;
+                csipSetCoordinator.close();
+                break;
+            case BluetoothProfile.LE_CALL_CONTROL:
+                BluetoothLeCallControl tbs = (BluetoothLeCallControl) proxy;
+                tbs.close();
+                break;
+        }
+    }
+
+    private static final IBluetoothManagerCallback sManagerCallback =
+            new IBluetoothManagerCallback.Stub() {
+                public void onBluetoothServiceUp(IBluetooth bluetoothService) {
+                    if (DBG) {
+                        Log.d(TAG, "onBluetoothServiceUp: " + bluetoothService);
+                    }
+
+                    synchronized (sServiceLock) {
+                        sService = bluetoothService;
+                        for (IBluetoothManagerCallback cb : sProxyServiceStateCallbacks.keySet()) {
+                            try {
+                                if (cb != null) {
+                                    cb.onBluetoothServiceUp(bluetoothService);
+                                } else {
+                                    Log.d(TAG, "onBluetoothServiceUp: cb is null!");
+                                }
+                            } catch (Exception e) {
+                                Log.e(TAG, "", e);
+                            }
+                        }
+                    }
+                }
+
+                public void onBluetoothServiceDown() {
+                    if (DBG) {
+                        Log.d(TAG, "onBluetoothServiceDown");
+                    }
+
+                    synchronized (sServiceLock) {
+                        sService = null;
+                        for (IBluetoothManagerCallback cb : sProxyServiceStateCallbacks.keySet()) {
+                            try {
+                                if (cb != null) {
+                                    cb.onBluetoothServiceDown();
+                                } else {
+                                    Log.d(TAG, "onBluetoothServiceDown: cb is null!");
+                                }
+                            } catch (Exception e) {
+                                Log.e(TAG, "", e);
+                            }
+                        }
+                    }
+                }
+
+                public void onBrEdrDown() {
+                    if (VDBG) {
+                        Log.i(TAG, "onBrEdrDown");
+                    }
+
+                    synchronized (sServiceLock) {
+                        for (IBluetoothManagerCallback cb : sProxyServiceStateCallbacks.keySet()) {
+                            try {
+                                if (cb != null) {
+                                    cb.onBrEdrDown();
+                                } else {
+                                    Log.d(TAG, "onBrEdrDown: cb is null!");
+                                }
+                            } catch (Exception e) {
+                                Log.e(TAG, "", e);
+                            }
+                        }
+                    }
+                }
+            };
+
+    private final IBluetoothManagerCallback mManagerCallback =
+            new IBluetoothManagerCallback.Stub() {
+                public void onBluetoothServiceUp(IBluetooth bluetoothService) {
+                    synchronized (mServiceLock.writeLock()) {
+                        mService = bluetoothService;
+                    }
+                    synchronized (mMetadataListeners) {
+                        mMetadataListeners.forEach((device, pair) -> {
+                            try {
+                                mService.registerMetadataListener(mBluetoothMetadataListener,
+                                        device, mAttributionSource);
+                            } catch (RemoteException e) {
+                                Log.e(TAG, "Failed to register metadata listener", e);
+                            }
+                        });
+                    }
+                    synchronized (mBluetoothConnectionCallbackExecutorMap) {
+                        if (!mBluetoothConnectionCallbackExecutorMap.isEmpty()) {
+                            try {
+                                mService.registerBluetoothConnectionCallback(mConnectionCallback,
+                                        mAttributionSource);
+                            } catch (RemoteException e) {
+                                Log.e(TAG, "onBluetoothServiceUp: Failed to register bluetooth"
+                                        + "connection callback", e);
+                            }
+                        }
+                    }
+                }
+
+                public void onBluetoothServiceDown() {
+                    synchronized (mServiceLock.writeLock()) {
+                        mService = null;
+                        if (mLeScanClients != null) {
+                            mLeScanClients.clear();
+                        }
+                        if (mBluetoothLeAdvertiser != null) {
+                            mBluetoothLeAdvertiser.cleanup();
+                        }
+                        if (mBluetoothLeScanner != null) {
+                            mBluetoothLeScanner.cleanup();
+                        }
+                    }
+                }
+
+                public void onBrEdrDown() {
+                }
+            };
+
+    /**
+     * Enable the Bluetooth Adapter, but don't auto-connect devices
+     * and don't persist state. Only for use by system applications.
+     *
+     * @hide
+     */
+    @SystemApi
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean enableNoAutoConnect() {
+        if (isEnabled()) {
+            if (DBG) {
+                Log.d(TAG, "enableNoAutoConnect(): BT already enabled!");
+            }
+            return true;
+        }
+        try {
+            return mManagerService.enableNoAutoConnect(mAttributionSource);
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        }
+        return false;
+    }
+
+    /** @hide */
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef(value = {
+            BluetoothStatusCodes.ERROR_UNKNOWN,
+            BluetoothStatusCodes.ERROR_BLUETOOTH_NOT_ENABLED,
+            BluetoothStatusCodes.ERROR_ANOTHER_ACTIVE_OOB_REQUEST,
+    })
+    public @interface OobError {}
+
+    /**
+     * Provides callback methods for receiving {@link OobData} from the host stack, as well as an
+     * error interface in order to allow the caller to determine next steps based on the {@code
+     * ErrorCode}.
+     *
+     * @hide
+     */
+    @SystemApi
+    public interface OobDataCallback {
+        /**
+         * Handles the {@link OobData} received from the host stack.
+         *
+         * @param transport - whether the {@link OobData} is generated for LE or Classic.
+         * @param oobData - data generated in the host stack(LE) or controller (Classic)
+         */
+        void onOobData(@Transport int transport, @NonNull OobData oobData);
+
+        /**
+         * Provides feedback when things don't go as expected.
+         *
+         * @param errorCode - the code describing the type of error that occurred.
+         */
+        void onError(@OobError int errorCode);
+    }
+
+    /**
+     * Wraps an AIDL interface around an {@link OobDataCallback} interface.
+     *
+     * @see {@link IBluetoothOobDataCallback} for interface definition.
+     *
+     * @hide
+     */
+    public class WrappedOobDataCallback extends IBluetoothOobDataCallback.Stub {
+        private final OobDataCallback mCallback;
+        private final Executor mExecutor;
+
+        /**
+         * @param callback - object to receive {@link OobData} must be a non null argument
+         *
+         * @throws NullPointerException if the callback is null.
+         */
+        WrappedOobDataCallback(@NonNull OobDataCallback callback,
+                @NonNull @CallbackExecutor Executor executor) {
+            requireNonNull(callback);
+            requireNonNull(executor);
+            mCallback = callback;
+            mExecutor = executor;
+        }
+        /**
+         * Wrapper function to relay to the {@link OobDataCallback#onOobData}
+         *
+         * @param transport - whether the {@link OobData} is generated for LE or Classic.
+         * @param oobData - data generated in the host stack(LE) or controller (Classic)
+         *
+         * @hide
+         */
+        public void onOobData(@Transport int transport, @NonNull OobData oobData) {
+            mExecutor.execute(new Runnable() {
+                public void run() {
+                    mCallback.onOobData(transport, oobData);
+                }
+            });
+        }
+        /**
+         * Wrapper function to relay to the {@link OobDataCallback#onError}
+         *
+         * @param errorCode - the code descibing the type of error that occurred.
+         *
+         * @hide
+         */
+        public void onError(@OobError int errorCode) {
+            mExecutor.execute(new Runnable() {
+                public void run() {
+                    mCallback.onError(errorCode);
+                }
+            });
+        }
+    }
+
+    /**
+     * Fetches a secret data value that can be used for a secure and simple pairing experience.
+     *
+     * <p>This is the Local Out of Band data the comes from the
+     *
+     * <p>This secret is the local Out of Band data.  This data is used to securely and quickly
+     * pair two devices with minimal user interaction.
+     *
+     * <p>For example, this secret can be transferred to a remote device out of band (meaning any
+     * other way besides using bluetooth).  Once the remote device finds this device using the
+     * information given in the data, such as the PUBLIC ADDRESS, the remote device could then
+     * connect to this device using this secret when the pairing sequenece asks for the secret.
+     * This device will respond by automatically accepting the pairing due to the secret being so
+     * trustworthy.
+     *
+     * @param transport - provide type of transport (e.g. LE or Classic).
+     * @param callback - target object to receive the {@link OobData} value.
+     *
+     * @throws NullPointerException if callback is null.
+     * @throws IllegalArgumentException if the transport is not valid.
+     *
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public void generateLocalOobData(@Transport int transport,
+            @NonNull @CallbackExecutor Executor executor, @NonNull OobDataCallback callback) {
+        if (transport != BluetoothDevice.TRANSPORT_BREDR && transport
+                != BluetoothDevice.TRANSPORT_LE) {
+            throw new IllegalArgumentException("Invalid transport '" + transport + "'!");
+        }
+        requireNonNull(callback);
+        if (!isEnabled()) {
+            Log.w(TAG, "generateLocalOobData(): Adapter isn't enabled!");
+            callback.onError(BluetoothStatusCodes.ERROR_BLUETOOTH_NOT_ENABLED);
+        } else {
+            try {
+                mService.generateLocalOobData(transport, new WrappedOobDataCallback(callback,
+                        executor), mAttributionSource);
+            } catch (RemoteException e) {
+                Log.e(TAG, "", e);
+            }
+        }
+    }
+
+    /**
+     * Enable control of the Bluetooth Adapter for a single application.
+     *
+     * <p>Some applications need to use Bluetooth for short periods of time to
+     * transfer data but don't want all the associated implications like
+     * automatic connection to headsets etc.
+     *
+     * <p> Multiple applications can call this. This is reference counted and
+     * Bluetooth disabled only when no one else is using it. There will be no UI
+     * shown to the user while bluetooth is being enabled. Any user action will
+     * override this call. For example, if user wants Bluetooth on and the last
+     * user of this API wanted to disable Bluetooth, Bluetooth will not be
+     * turned off.
+     *
+     * <p> This API is only meant to be used by internal applications. Third
+     * party applications but use {@link #enable} and {@link #disable} APIs.
+     *
+     * <p> If this API returns true, it means the callback will be called.
+     * The callback will be called with the current state of Bluetooth.
+     * If the state is not what was requested, an internal error would be the
+     * reason. If Bluetooth is already on and if this function is called to turn
+     * it on, the api will return true and a callback will be called.
+     *
+     * @param on True for on, false for off.
+     * @param callback The callback to notify changes to the state.
+     * @hide
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SuppressLint("AndroidFrameworkRequiresPermission")
+    public boolean changeApplicationBluetoothState(boolean on,
+            BluetoothStateChangeCallback callback) {
+        return false;
+    }
+
+    /**
+     * @hide
+     */
+    public interface BluetoothStateChangeCallback {
+        /**
+         * @hide
+         */
+        void onBluetoothStateChange(boolean on);
+    }
+
+    /**
+     * @hide
+     */
+    public class StateChangeCallbackWrapper extends IBluetoothStateChangeCallback.Stub {
+        private BluetoothStateChangeCallback mCallback;
+
+        StateChangeCallbackWrapper(BluetoothStateChangeCallback callback) {
+            mCallback = callback;
+        }
+
+        @Override
+        public void onBluetoothStateChange(boolean on) {
+            mCallback.onBluetoothStateChange(on);
+        }
+    }
+
+    private Set<BluetoothDevice> toDeviceSet(List<BluetoothDevice> devices) {
+        Set<BluetoothDevice> deviceSet = new HashSet<BluetoothDevice>(devices);
+        return Collections.unmodifiableSet(deviceSet);
+    }
+
+    protected void finalize() throws Throwable {
+        try {
+            removeServiceStateCallback(mManagerCallback);
+        } finally {
+            super.finalize();
+        }
+    }
+
+    /**
+     * Validate a String Bluetooth address, such as "00:43:A8:23:10:F0"
+     * <p>Alphabetic characters must be uppercase to be valid.
+     *
+     * @param address Bluetooth address as string
+     * @return true if the address is valid, false otherwise
+     */
+    public static boolean checkBluetoothAddress(String address) {
+        if (address == null || address.length() != ADDRESS_LENGTH) {
+            return false;
+        }
+        for (int i = 0; i < ADDRESS_LENGTH; i++) {
+            char c = address.charAt(i);
+            switch (i % 3) {
+                case 0:
+                case 1:
+                    if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F')) {
+                        // hex character, OK
+                        break;
+                    }
+                    return false;
+                case 2:
+                    if (c == ':') {
+                        break;  // OK
+                    }
+                    return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Determines whether a String Bluetooth address, such as "F0:43:A8:23:10:00"
+     * is a RANDOM STATIC address.
+     *
+     * RANDOM STATIC: (addr & 0xC0) == 0xC0
+     * RANDOM RESOLVABLE: (addr &  0xC0) == 0x40
+     * RANDOM non-RESOLVABLE: (addr &  0xC0) == 0x00
+     *
+     * @param address Bluetooth address as string
+     * @return true if the 2 Most Significant Bits of the address equals 0xC0.
+     *
+     * @hide
+     */
+    public static boolean isAddressRandomStatic(@NonNull String address) {
+        requireNonNull(address);
+        return checkBluetoothAddress(address)
+                && (Integer.parseInt(address.split(":")[0], 16) & 0xC0) == 0xC0;
+    }
+
+    /** {@hide} */
+    @UnsupportedAppUsage
+    @RequiresNoPermission
+    public IBluetoothManager getBluetoothManager() {
+        return mManagerService;
+    }
+
+    /** {@hide} */
+    @RequiresNoPermission
+    public AttributionSource getAttributionSource() {
+        return mAttributionSource;
+    }
+
+    @GuardedBy("sServiceLock")
+    private static final WeakHashMap<IBluetoothManagerCallback, Void> sProxyServiceStateCallbacks =
+            new WeakHashMap<>();
+
+    /*package*/ IBluetooth getBluetoothService() {
+        synchronized (sServiceLock) {
+            if (sProxyServiceStateCallbacks.isEmpty()) {
+                throw new IllegalStateException(
+                        "Anonymous service access requires at least one lifecycle in process");
+            }
+            return sService;
+        }
+    }
+
+    @UnsupportedAppUsage
+    /*package*/ IBluetooth getBluetoothService(IBluetoothManagerCallback cb) {
+        Objects.requireNonNull(cb);
+        synchronized (sServiceLock) {
+            sProxyServiceStateCallbacks.put(cb, null);
+            registerOrUnregisterAdapterLocked();
+            return sService;
+        }
+    }
+
+    /*package*/ void removeServiceStateCallback(IBluetoothManagerCallback cb) {
+        Objects.requireNonNull(cb);
+        synchronized (sServiceLock) {
+            sProxyServiceStateCallbacks.remove(cb);
+            registerOrUnregisterAdapterLocked();
+        }
+    }
+
+    /**
+     * Handle registering (or unregistering) a single process-wide
+     * {@link IBluetoothManagerCallback} based on the presence of local
+     * {@link #sProxyServiceStateCallbacks} clients.
+     */
+    @GuardedBy("sServiceLock")
+    private void registerOrUnregisterAdapterLocked() {
+        final boolean isRegistered = sServiceRegistered;
+        final boolean wantRegistered = !sProxyServiceStateCallbacks.isEmpty();
+
+        if (isRegistered != wantRegistered) {
+            if (wantRegistered) {
+                try {
+                    sService = mManagerService.registerAdapter(sManagerCallback);
+                } catch (RemoteException e) {
+                    throw e.rethrowFromSystemServer();
+                }
+            } else {
+                try {
+                    mManagerService.unregisterAdapter(sManagerCallback);
+                    sService = null;
+                } catch (RemoteException e) {
+                    throw e.rethrowFromSystemServer();
+                }
+            }
+            sServiceRegistered = wantRegistered;
+        }
+    }
+
+    /**
+     * Callback interface used to deliver LE scan results.
+     *
+     * @see #startLeScan(LeScanCallback)
+     * @see #startLeScan(UUID[], LeScanCallback)
+     */
+    public interface LeScanCallback {
+        /**
+         * Callback reporting an LE device found during a device scan initiated
+         * by the {@link BluetoothAdapter#startLeScan} function.
+         *
+         * @param device Identifies the remote device
+         * @param rssi The RSSI value for the remote device as reported by the Bluetooth hardware. 0
+         * if no RSSI value is available.
+         * @param scanRecord The content of the advertisement record offered by the remote device.
+         */
+        void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord);
+    }
+
+    /**
+     * Register a callback to receive events whenever the bluetooth stack goes down and back up,
+     * e.g. in the event the bluetooth is turned off/on via settings.
+     *
+     * If the bluetooth stack is currently up, there will not be an initial callback call.
+     * You can use the return value as an indication of this being the case.
+     *
+     * Callbacks will be delivered on a binder thread.
+     *
+     * @return whether bluetooth is already up currently
+     *
+     * @hide
+     */
+    public boolean registerServiceLifecycleCallback(ServiceLifecycleCallback callback) {
+        return getBluetoothService(callback.mRemote) != null;
+    }
+
+    /**
+     * Unregister a callback registered via {@link #registerServiceLifecycleCallback}
+     *
+     * @hide
+     */
+    public void unregisterServiceLifecycleCallback(ServiceLifecycleCallback callback) {
+        removeServiceStateCallback(callback.mRemote);
+    }
+
+    /**
+     * A callback for {@link #registerServiceLifecycleCallback}
+     *
+     * @hide
+     */
+    public abstract static class ServiceLifecycleCallback {
+
+        /** Called when the bluetooth stack is up */
+        public abstract void onBluetoothServiceUp();
+
+        /** Called when the bluetooth stack is down */
+        public abstract void onBluetoothServiceDown();
+
+        IBluetoothManagerCallback mRemote = new IBluetoothManagerCallback.Stub() {
+            @Override
+            public void onBluetoothServiceUp(IBluetooth bluetoothService) {
+                ServiceLifecycleCallback.this.onBluetoothServiceUp();
+            }
+
+            @Override
+            public void onBluetoothServiceDown() {
+                ServiceLifecycleCallback.this.onBluetoothServiceDown();
+            }
+
+            @Override
+            public void onBrEdrDown() {}
+        };
+    }
+
+    /**
+     * Starts a scan for Bluetooth LE devices.
+     *
+     * <p>Results of the scan are reported using the
+     * {@link LeScanCallback#onLeScan} callback.
+     *
+     * @param callback the callback LE scan results are delivered
+     * @return true, if the scan was started successfully
+     * @deprecated use {@link BluetoothLeScanner#startScan(List, ScanSettings, ScanCallback)}
+     * instead.
+     */
+    @Deprecated
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothScanPermission
+    @RequiresBluetoothLocationPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public boolean startLeScan(LeScanCallback callback) {
+        return startLeScan(null, callback);
+    }
+
+    /**
+     * Starts a scan for Bluetooth LE devices, looking for devices that
+     * advertise given services.
+     *
+     * <p>Devices which advertise all specified services are reported using the
+     * {@link LeScanCallback#onLeScan} callback.
+     *
+     * @param serviceUuids Array of services to look for
+     * @param callback the callback LE scan results are delivered
+     * @return true, if the scan was started successfully
+     * @deprecated use {@link BluetoothLeScanner#startScan(List, ScanSettings, ScanCallback)}
+     * instead.
+     */
+    @Deprecated
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothScanPermission
+    @RequiresBluetoothLocationPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public boolean startLeScan(final UUID[] serviceUuids, final LeScanCallback callback) {
+        if (DBG) {
+            Log.d(TAG, "startLeScan(): " + Arrays.toString(serviceUuids));
+        }
+        if (callback == null) {
+            if (DBG) {
+                Log.e(TAG, "startLeScan: null callback");
+            }
+            return false;
+        }
+        BluetoothLeScanner scanner = getBluetoothLeScanner();
+        if (scanner == null) {
+            if (DBG) {
+                Log.e(TAG, "startLeScan: cannot get BluetoothLeScanner");
+            }
+            return false;
+        }
+
+        synchronized (mLeScanClients) {
+            if (mLeScanClients.containsKey(callback)) {
+                if (DBG) {
+                    Log.e(TAG, "LE Scan has already started");
+                }
+                return false;
+            }
+
+            try {
+                IBluetoothGatt iGatt = mManagerService.getBluetoothGatt();
+                if (iGatt == null) {
+                    // BLE is not supported
+                    return false;
+                }
+
+                @SuppressLint("AndroidFrameworkBluetoothPermission")
+                ScanCallback scanCallback = new ScanCallback() {
+                    @Override
+                    public void onScanResult(int callbackType, ScanResult result) {
+                        if (callbackType != ScanSettings.CALLBACK_TYPE_ALL_MATCHES) {
+                            // Should not happen.
+                            Log.e(TAG, "LE Scan has already started");
+                            return;
+                        }
+                        ScanRecord scanRecord = result.getScanRecord();
+                        if (scanRecord == null) {
+                            return;
+                        }
+                        if (serviceUuids != null) {
+                            List<ParcelUuid> uuids = new ArrayList<ParcelUuid>();
+                            for (UUID uuid : serviceUuids) {
+                                uuids.add(new ParcelUuid(uuid));
+                            }
+                            List<ParcelUuid> scanServiceUuids = scanRecord.getServiceUuids();
+                            if (scanServiceUuids == null || !scanServiceUuids.containsAll(uuids)) {
+                                if (DBG) {
+                                    Log.d(TAG, "uuids does not match");
+                                }
+                                return;
+                            }
+                        }
+                        callback.onLeScan(result.getDevice(), result.getRssi(),
+                                scanRecord.getBytes());
+                    }
+                };
+                ScanSettings settings = new ScanSettings.Builder().setCallbackType(
+                        ScanSettings.CALLBACK_TYPE_ALL_MATCHES)
+                        .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
+                        .build();
+
+                List<ScanFilter> filters = new ArrayList<ScanFilter>();
+                if (serviceUuids != null && serviceUuids.length > 0) {
+                    // Note scan filter does not support matching an UUID array so we put one
+                    // UUID to hardware and match the whole array in callback.
+                    ScanFilter filter =
+                            new ScanFilter.Builder().setServiceUuid(new ParcelUuid(serviceUuids[0]))
+                                    .build();
+                    filters.add(filter);
+                }
+                scanner.startScan(filters, settings, scanCallback);
+
+                mLeScanClients.put(callback, scanCallback);
+                return true;
+
+            } catch (RemoteException e) {
+                Log.e(TAG, "", e);
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Stops an ongoing Bluetooth LE device scan.
+     *
+     * @param callback used to identify which scan to stop must be the same handle used to start the
+     * scan
+     * @deprecated Use {@link BluetoothLeScanner#stopScan(ScanCallback)} instead.
+     */
+    @Deprecated
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothScanPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_SCAN)
+    public void stopLeScan(LeScanCallback callback) {
+        if (DBG) {
+            Log.d(TAG, "stopLeScan()");
+        }
+        BluetoothLeScanner scanner = getBluetoothLeScanner();
+        if (scanner == null) {
+            return;
+        }
+        synchronized (mLeScanClients) {
+            ScanCallback scanCallback = mLeScanClients.remove(callback);
+            if (scanCallback == null) {
+                if (DBG) {
+                    Log.d(TAG, "scan not started yet");
+                }
+                return;
+            }
+            scanner.stopScan(scanCallback);
+        }
+    }
+
+    /**
+     * Create a secure L2CAP Connection-oriented Channel (CoC) {@link BluetoothServerSocket} and
+     * assign a dynamic protocol/service multiplexer (PSM) value. This socket can be used to listen
+     * for incoming connections. The supported Bluetooth transport is LE only.
+     * <p>A remote device connecting to this socket will be authenticated and communication on this
+     * socket will be encrypted.
+     * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming connections from a listening
+     * {@link BluetoothServerSocket}.
+     * <p>The system will assign a dynamic PSM value. This PSM value can be read from the {@link
+     * BluetoothServerSocket#getPsm()} and this value will be released when this server socket is
+     * closed, Bluetooth is turned off, or the application exits unexpectedly.
+     * <p>The mechanism of disclosing the assigned dynamic PSM value to the initiating peer is
+     * defined and performed by the application.
+     * <p>Use {@link BluetoothDevice#createL2capChannel(int)} to connect to this server
+     * socket from another Android device that is given the PSM value.
+     *
+     * @return an L2CAP CoC BluetoothServerSocket
+     * @throws IOException on error, for example Bluetooth not available, or insufficient
+     * permissions, or unable to start this CoC
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public @NonNull BluetoothServerSocket listenUsingL2capChannel()
+            throws IOException {
+        BluetoothServerSocket socket =
+                            new BluetoothServerSocket(BluetoothSocket.TYPE_L2CAP_LE, true, true,
+                                      SOCKET_CHANNEL_AUTO_STATIC_NO_SDP, false, false);
+        int errno = socket.mSocket.bindListen();
+        if (errno != 0) {
+            throw new IOException("Error: " + errno);
+        }
+
+        int assignedPsm = socket.mSocket.getPort();
+        if (assignedPsm == 0) {
+            throw new IOException("Error: Unable to assign PSM value");
+        }
+        if (DBG) {
+            Log.d(TAG, "listenUsingL2capChannel: set assigned PSM to "
+                    + assignedPsm);
+        }
+        socket.setChannel(assignedPsm);
+
+        return socket;
+    }
+
+    /**
+     * Create an insecure L2CAP Connection-oriented Channel (CoC) {@link BluetoothServerSocket} and
+     * assign a dynamic PSM value. This socket can be used to listen for incoming connections. The
+     * supported Bluetooth transport is LE only.
+     * <p>The link key is not required to be authenticated, i.e the communication may be vulnerable
+     * to person-in-the-middle attacks. Use {@link #listenUsingL2capChannel}, if an encrypted and
+     * authenticated communication channel is desired.
+     * <p>Use {@link BluetoothServerSocket#accept} to retrieve incoming connections from a listening
+     * {@link BluetoothServerSocket}.
+     * <p>The system will assign a dynamic protocol/service multiplexer (PSM) value. This PSM value
+     * can be read from the {@link BluetoothServerSocket#getPsm()} and this value will be released
+     * when this server socket is closed, Bluetooth is turned off, or the application exits
+     * unexpectedly.
+     * <p>The mechanism of disclosing the assigned dynamic PSM value to the initiating peer is
+     * defined and performed by the application.
+     * <p>Use {@link BluetoothDevice#createInsecureL2capChannel(int)} to connect to this server
+     * socket from another Android device that is given the PSM value.
+     *
+     * @return an L2CAP CoC BluetoothServerSocket
+     * @throws IOException on error, for example Bluetooth not available, or insufficient
+     * permissions, or unable to start this CoC
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public @NonNull BluetoothServerSocket listenUsingInsecureL2capChannel()
+            throws IOException {
+        BluetoothServerSocket socket =
+                            new BluetoothServerSocket(BluetoothSocket.TYPE_L2CAP_LE, false, false,
+                                      SOCKET_CHANNEL_AUTO_STATIC_NO_SDP, false, false);
+        int errno = socket.mSocket.bindListen();
+        if (errno != 0) {
+            throw new IOException("Error: " + errno);
+        }
+
+        int assignedPsm = socket.mSocket.getPort();
+        if (assignedPsm == 0) {
+            throw new IOException("Error: Unable to assign PSM value");
+        }
+        if (DBG) {
+            Log.d(TAG, "listenUsingInsecureL2capChannel: set assigned PSM to "
+                    + assignedPsm);
+        }
+        socket.setChannel(assignedPsm);
+
+        return socket;
+    }
+
+    /**
+     * Register a {@link #OnMetadataChangedListener} to receive update about metadata
+     * changes for this {@link BluetoothDevice}.
+     * Registration must be done when Bluetooth is ON and will last until
+     * {@link #removeOnMetadataChangedListener(BluetoothDevice)} is called, even when Bluetooth
+     * restarted in the middle.
+     * All input parameters should not be null or {@link NullPointerException} will be triggered.
+     * The same {@link BluetoothDevice} and {@link #OnMetadataChangedListener} pair can only be
+     * registered once, double registration would cause {@link IllegalArgumentException}.
+     *
+     * @param device {@link BluetoothDevice} that will be registered
+     * @param executor the executor for listener callback
+     * @param listener {@link #OnMetadataChangedListener} that will receive asynchronous callbacks
+     * @return true on success, false on error
+     * @throws NullPointerException If one of {@code listener}, {@code device} or {@code executor}
+     * is null.
+     * @throws IllegalArgumentException The same {@link #OnMetadataChangedListener} and
+     * {@link BluetoothDevice} are registered twice.
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean addOnMetadataChangedListener(@NonNull BluetoothDevice device,
+            @NonNull Executor executor, @NonNull OnMetadataChangedListener listener) {
+        if (DBG) Log.d(TAG, "addOnMetadataChangedListener()");
+
+        final IBluetooth service = mService;
+        if (service == null) {
+            Log.e(TAG, "Bluetooth is not enabled. Cannot register metadata listener");
+            return false;
+        }
+        if (listener == null) {
+            throw new NullPointerException("listener is null");
+        }
+        if (device == null) {
+            throw new NullPointerException("device is null");
+        }
+        if (executor == null) {
+            throw new NullPointerException("executor is null");
+        }
+
+        synchronized (mMetadataListeners) {
+            List<Pair<OnMetadataChangedListener, Executor>> listenerList =
+                    mMetadataListeners.get(device);
+            if (listenerList == null) {
+                // Create new listener/executor list for registeration
+                listenerList = new ArrayList<>();
+                mMetadataListeners.put(device, listenerList);
+            } else {
+                // Check whether this device was already registed by the lisenter
+                if (listenerList.stream().anyMatch((pair) -> (pair.first.equals(listener)))) {
+                    throw new IllegalArgumentException("listener was already regestered"
+                            + " for the device");
+                }
+            }
+
+            Pair<OnMetadataChangedListener, Executor> listenerPair = new Pair(listener, executor);
+            listenerList.add(listenerPair);
+
+            boolean ret = false;
+            try {
+                ret = service.registerMetadataListener(mBluetoothMetadataListener, device,
+                        mAttributionSource);
+            } catch (RemoteException e) {
+                Log.e(TAG, "registerMetadataListener fail", e);
+            } finally {
+                if (!ret) {
+                    // Remove listener registered earlier when fail.
+                    listenerList.remove(listenerPair);
+                    if (listenerList.isEmpty()) {
+                        // Remove the device if its listener list is empty
+                        mMetadataListeners.remove(device);
+                    }
+                }
+            }
+            return ret;
+        }
+    }
+
+    /**
+     * Unregister a {@link #OnMetadataChangedListener} from a registered {@link BluetoothDevice}.
+     * Unregistration can be done when Bluetooth is either ON or OFF.
+     * {@link #addOnMetadataChangedListener(OnMetadataChangedListener, BluetoothDevice, Executor)}
+     * must be called before unregisteration.
+     *
+     * @param device {@link BluetoothDevice} that will be unregistered. It
+     * should not be null or {@link NullPointerException} will be triggered.
+     * @param listener {@link OnMetadataChangedListener} that will be unregistered. It
+     * should not be null or {@link NullPointerException} will be triggered.
+     * @return true on success, false on error
+     * @throws NullPointerException If {@code listener} or {@code device} is null.
+     * @throws IllegalArgumentException If {@code device} has not been registered before.
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean removeOnMetadataChangedListener(@NonNull BluetoothDevice device,
+            @NonNull OnMetadataChangedListener listener) {
+        if (DBG) Log.d(TAG, "removeOnMetadataChangedListener()");
+        if (device == null) {
+            throw new NullPointerException("device is null");
+        }
+        if (listener == null) {
+            throw new NullPointerException("listener is null");
+        }
+
+        synchronized (mMetadataListeners) {
+            if (!mMetadataListeners.containsKey(device)) {
+                throw new IllegalArgumentException("device was not registered");
+            }
+            // Remove issued listener from the registered device
+            mMetadataListeners.get(device).removeIf((pair) -> (pair.first.equals(listener)));
+
+            if (mMetadataListeners.get(device).isEmpty()) {
+                // Unregister to Bluetooth service if all listeners are removed from
+                // the registered device
+                mMetadataListeners.remove(device);
+                final IBluetooth service = mService;
+                if (service == null) {
+                    // Bluetooth is OFF, do nothing to Bluetooth service.
+                    return true;
+                }
+                try {
+                    return service.unregisterMetadataListener(device, mAttributionSource);
+                } catch (RemoteException e) {
+                    Log.e(TAG, "unregisterMetadataListener fail", e);
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    /**
+     * This interface is used to implement {@link BluetoothAdapter} metadata listener.
+     * @hide
+     */
+    @SystemApi
+    public interface OnMetadataChangedListener {
+        /**
+         * Callback triggered if the metadata of {@link BluetoothDevice} registered in
+         * {@link #addOnMetadataChangedListener}.
+         *
+         * @param device changed {@link BluetoothDevice}.
+         * @param key changed metadata key, one of BluetoothDevice.METADATA_*.
+         * @param value the new value of metadata as byte array.
+         */
+        void onMetadataChanged(@NonNull BluetoothDevice device, int key,
+                @Nullable byte[] value);
+    }
+
+    @SuppressLint("AndroidFrameworkBluetoothPermission")
+    private final IBluetoothConnectionCallback mConnectionCallback =
+            new IBluetoothConnectionCallback.Stub() {
+        @Override
+        public void onDeviceConnected(BluetoothDevice device) {
+            Attributable.setAttributionSource(device, mAttributionSource);
+            for (Map.Entry<BluetoothConnectionCallback, Executor> callbackExecutorEntry:
+                    mBluetoothConnectionCallbackExecutorMap.entrySet()) {
+                BluetoothConnectionCallback callback = callbackExecutorEntry.getKey();
+                Executor executor = callbackExecutorEntry.getValue();
+                executor.execute(() -> callback.onDeviceConnected(device));
+            }
+        }
+
+        @Override
+        public void onDeviceDisconnected(BluetoothDevice device, int hciReason) {
+            Attributable.setAttributionSource(device, mAttributionSource);
+            for (Map.Entry<BluetoothConnectionCallback, Executor> callbackExecutorEntry:
+                    mBluetoothConnectionCallbackExecutorMap.entrySet()) {
+                BluetoothConnectionCallback callback = callbackExecutorEntry.getKey();
+                Executor executor = callbackExecutorEntry.getValue();
+                executor.execute(() -> callback.onDeviceDisconnected(device, hciReason));
+            }
+        }
+    };
+
+    /**
+     * Registers the BluetoothConnectionCallback to receive callback events when a bluetooth device
+     * (classic or low energy) is connected or disconnected.
+     *
+     * @param executor is the callback executor
+     * @param callback is the connection callback you wish to register
+     * @return true if the callback was registered successfully, false otherwise
+     * @throws IllegalArgumentException if the callback is already registered
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean registerBluetoothConnectionCallback(@NonNull @CallbackExecutor Executor executor,
+            @NonNull BluetoothConnectionCallback callback) {
+        if (DBG) Log.d(TAG, "registerBluetoothConnectionCallback()");
+        if (callback == null) {
+            return false;
+        }
+
+        synchronized (mBluetoothConnectionCallbackExecutorMap) {
+            // If the callback map is empty, we register the service-to-app callback
+            if (mBluetoothConnectionCallbackExecutorMap.isEmpty()) {
+                try {
+                    mServiceLock.readLock().lock();
+                    if (mService != null) {
+                        if (!mService.registerBluetoothConnectionCallback(mConnectionCallback,
+                                mAttributionSource)) {
+                            return false;
+                        }
+                    }
+                } catch (RemoteException e) {
+                    Log.e(TAG, "", e);
+                    mBluetoothConnectionCallbackExecutorMap.remove(callback);
+                } finally {
+                    mServiceLock.readLock().unlock();
+                }
+            }
+
+            // Adds the passed in callback to our map of callbacks to executors
+            if (mBluetoothConnectionCallbackExecutorMap.containsKey(callback)) {
+                throw new IllegalArgumentException("This callback has already been registered");
+            }
+            mBluetoothConnectionCallbackExecutorMap.put(callback, executor);
+        }
+
+        return true;
+    }
+
+    /**
+     * Unregisters the BluetoothConnectionCallback that was previously registered by the application
+     *
+     * @param callback is the connection callback you wish to unregister
+     * @return true if the callback was unregistered successfully, false otherwise
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public boolean unregisterBluetoothConnectionCallback(
+            @NonNull BluetoothConnectionCallback callback) {
+        if (DBG) Log.d(TAG, "unregisterBluetoothConnectionCallback()");
+        if (callback == null) {
+            return false;
+        }
+
+        synchronized (mBluetoothConnectionCallbackExecutorMap) {
+            if (mBluetoothConnectionCallbackExecutorMap.remove(callback) != null) {
+                return false;
+            }
+        }
+
+        if (!mBluetoothConnectionCallbackExecutorMap.isEmpty()) {
+            return true;
+        }
+
+        // If the callback map is empty, we unregister the service-to-app callback
+        try {
+            mServiceLock.readLock().lock();
+            if (mService != null) {
+                return mService.unregisterBluetoothConnectionCallback(mConnectionCallback,
+                        mAttributionSource);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "", e);
+        } finally {
+            mServiceLock.readLock().unlock();
+        }
+
+        return false;
+    }
+
+    /**
+     * This abstract class is used to implement callbacks for when a bluetooth classic or Bluetooth
+     * Low Energy (BLE) device is either connected or disconnected.
+     *
+     * @hide
+     */
+    public abstract static class BluetoothConnectionCallback {
+        /**
+         * Callback triggered when a bluetooth device (classic or BLE) is connected
+         * @param device is the connected bluetooth device
+         */
+        public void onDeviceConnected(BluetoothDevice device) {}
+
+        /**
+         * Callback triggered when a bluetooth device (classic or BLE) is disconnected
+         * @param device is the disconnected bluetooth device
+         * @param reason is the disconnect reason
+         */
+        public void onDeviceDisconnected(BluetoothDevice device, @DisconnectReason int reason) {}
+
+        /**
+         * @hide
+         */
+        @Retention(RetentionPolicy.SOURCE)
+        @IntDef(prefix = { "REASON_" }, value = {
+                BluetoothStatusCodes.ERROR_UNKNOWN,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_LOCAL_REQUEST,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_REMOTE_REQUEST,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_LOCAL,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_REMOTE,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_TIMEOUT,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_SECURITY,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_SYSTEM_POLICY,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_RESOURCE_LIMIT_REACHED,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_CONNECTION_ALREADY_EXISTS,
+                BluetoothStatusCodes.ERROR_DISCONNECT_REASON_BAD_PARAMETERS})
+        public @interface DisconnectReason {}
+
+        /**
+         * Returns human-readable strings corresponding to {@link DisconnectReason}.
+         */
+        public static String disconnectReasonText(@DisconnectReason int reason) {
+            switch (reason) {
+                case BluetoothStatusCodes.ERROR_UNKNOWN:
+                    return "Reason unknown";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_LOCAL_REQUEST:
+                    return "Local request";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_REMOTE_REQUEST:
+                    return "Remote request";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_LOCAL:
+                    return "Local error";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_REMOTE:
+                    return "Remote error";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_TIMEOUT:
+                    return "Timeout";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_SECURITY:
+                    return "Security";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_SYSTEM_POLICY:
+                    return "System policy";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_RESOURCE_LIMIT_REACHED:
+                    return "Resource constrained";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_CONNECTION_ALREADY_EXISTS:
+                    return "Connection already exists";
+                case BluetoothStatusCodes.ERROR_DISCONNECT_REASON_BAD_PARAMETERS:
+                    return "Bad parameters";
+                default:
+                    return "Unrecognized disconnect reason: " + reason;
+            }
+        }
+    }
+
+    /**
+     * Converts old constant of priority to the new for connection policy
+     *
+     * @param priority is the priority to convert to connection policy
+     * @return the equivalent connection policy constant to the priority
+     *
+     * @hide
+     */
+    public static @ConnectionPolicy int priorityToConnectionPolicy(int priority) {
+        switch(priority) {
+            case BluetoothProfile.PRIORITY_AUTO_CONNECT:
+                return BluetoothProfile.CONNECTION_POLICY_ALLOWED;
+            case BluetoothProfile.PRIORITY_ON:
+                return BluetoothProfile.CONNECTION_POLICY_ALLOWED;
+            case BluetoothProfile.PRIORITY_OFF:
+                return BluetoothProfile.CONNECTION_POLICY_FORBIDDEN;
+            case BluetoothProfile.PRIORITY_UNDEFINED:
+                return BluetoothProfile.CONNECTION_POLICY_UNKNOWN;
+            default:
+                Log.e(TAG, "setPriority: Invalid priority: " + priority);
+                return BluetoothProfile.CONNECTION_POLICY_UNKNOWN;
+        }
+    }
+
+    /**
+     * Converts new constant of connection policy to the old for priority
+     *
+     * @param connectionPolicy is the connection policy to convert to priority
+     * @return the equivalent priority constant to the connectionPolicy
+     *
+     * @hide
+     */
+    public static int connectionPolicyToPriority(@ConnectionPolicy int connectionPolicy) {
+        switch(connectionPolicy) {
+            case BluetoothProfile.CONNECTION_POLICY_ALLOWED:
+                return BluetoothProfile.PRIORITY_ON;
+            case BluetoothProfile.CONNECTION_POLICY_FORBIDDEN:
+                return BluetoothProfile.PRIORITY_OFF;
+            case BluetoothProfile.CONNECTION_POLICY_UNKNOWN:
+                return BluetoothProfile.PRIORITY_UNDEFINED;
+        }
+        return BluetoothProfile.PRIORITY_UNDEFINED;
+    }
+}