Bluetooth: add Volume Control Profile boilerpalate

This is very simple API to allow Android to connect VCP profile.

Bug: 150670922
Test: compilation
Sponsor: jpawlowski@
CTS-Coverage-Bug: 190833351
Change-Id: Ib20d967fcf6797077abf83b40b0eda526e5ab89d
Merged-In: Ib20d967fcf6797077abf83b40b0eda526e5ab89d

1 files changed, 320 insertions, 0 deletions

diff --git a/framework/java/android/bluetooth/BluetoothVolumeControl.java b/framework/java/android/bluetooth/BluetoothVolumeControl.java
new file mode 100644
index 0000000000..4eb28ad399
--- /dev/null
+++ b/framework/java/android/bluetooth/BluetoothVolumeControl.java
@@ -0,0 +1,320 @@
+/*
+ * Copyright 2021 HIMSA II K/S - www.himsa.com.
+ * Represented by EHIMA - www.ehima.com
+ *
+ * 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 android.Manifest;
+import android.annotation.IntRange;
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.annotation.RequiresPermission;
+import android.annotation.SdkConstant;
+import android.annotation.SdkConstant.SdkConstantType;
+import android.annotation.SuppressLint;
+import android.annotation.SystemApi;
+import android.compat.annotation.UnsupportedAppUsage;
+import android.content.Context;
+import android.os.Binder;
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.util.CloseGuard;
+import android.util.Log;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * This class provides the public APIs to control the Bluetooth Volume Control service.
+ *
+ * <p>BluetoothVolumeControl is a proxy object for controlling the Bluetooth VC
+ * Service via IPC. Use {@link BluetoothAdapter#getProfileProxy} to get
+ * the BluetoothVolumeControl proxy object.
+ * @hide
+ */
+@SystemApi
+public final class BluetoothVolumeControl implements BluetoothProfile, AutoCloseable {
+    private static final String TAG = "BluetoothVolumeControl";
+    private static final boolean DBG = true;
+    private static final boolean VDBG = false;
+
+    private CloseGuard mCloseGuard;
+
+    /**
+     * Intent used to broadcast the change in connection state of the Volume Control
+     * profile.
+     *
+     * <p>This intent will have 3 extras:
+     * <ul>
+     * <li> {@link #EXTRA_STATE} - The current state of the profile. </li>
+     * <li> {@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile.</li>
+     * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. </li>
+     * </ul>
+     *
+     * <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of
+     * {@link #STATE_DISCONNECTED}, {@link #STATE_CONNECTING},
+     * {@link #STATE_CONNECTED}, {@link #STATE_DISCONNECTING}.
+     *
+     * @hide
+     */
+    @SystemApi
+    @SuppressLint("ActionValue")
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_CONNECTION_STATE_CHANGED =
+            "android.bluetooth.volume-control.profile.action.CONNECTION_STATE_CHANGED";
+
+    private BluetoothAdapter mAdapter;
+    private final BluetoothProfileConnector<IBluetoothVolumeControl> mProfileConnector =
+            new BluetoothProfileConnector(this, BluetoothProfile.VOLUME_CONTROL, TAG,
+                    IBluetoothVolumeControl.class.getName()) {
+                @Override
+                public IBluetoothVolumeControl getServiceInterface(IBinder service) {
+                    return IBluetoothVolumeControl.Stub.asInterface(Binder.allowBlocking(service));
+                }
+            };
+
+    /**
+     * Create a BluetoothVolumeControl proxy object for interacting with the local
+     * Bluetooth Volume Control service.
+     */
+    /*package*/ BluetoothVolumeControl(Context context, ServiceListener listener,
+            BluetoothAdapter adapter) {
+        mAdapter = adapter;
+        mProfileConnector.connect(context, listener);
+        mCloseGuard = new CloseGuard();
+        mCloseGuard.open("close");
+    }
+
+    @RequiresPermission(Manifest.permission.BLUETOOTH_PRIVILEGED)
+    protected void finalize() {
+        if (mCloseGuard != null) {
+            mCloseGuard.warnIfOpen();
+        }
+        close();
+    }
+
+    /*package*/
+    @RequiresPermission(Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public void close() {
+        mProfileConnector.disconnect();
+    }
+
+    private IBluetoothVolumeControl getService() { return mProfileConnector.getService(); }
+
+    /**
+     * Get the list of connected devices. Currently at most one.
+     *
+     * @return list of connected devices
+     *
+     * @hide
+     */
+    @SystemApi
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public @NonNull List<BluetoothDevice> getConnectedDevices() {
+        if (DBG) log("getConnectedDevices()");
+        final IBluetoothVolumeControl service = getService();
+        if (service != null && isEnabled()) {
+            try {
+                return service.getConnectedDevices();
+            } catch (RemoteException e) {
+                Log.e(TAG, Log.getStackTraceString(new Throwable()));
+                return new ArrayList<BluetoothDevice>();
+            }
+        }
+        if (service == null) Log.w(TAG, "Proxy not attached to service");
+        return new ArrayList<BluetoothDevice>();
+    }
+
+    /**
+     * Get the list of devices matching specified states. Currently at most one.
+     *
+     * @return list of matching devices
+     *
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
+        if (DBG) log("getDevicesMatchingStates()");
+        final IBluetoothVolumeControl service = getService();
+        if (service != null && isEnabled()) {
+            try {
+                return service.getDevicesMatchingConnectionStates(states);
+            } catch (RemoteException e) {
+                Log.e(TAG, Log.getStackTraceString(new Throwable()));
+                return new ArrayList<BluetoothDevice>();
+            }
+        }
+        if (service == null) Log.w(TAG, "Proxy not attached to service");
+        return new ArrayList<BluetoothDevice>();
+    }
+
+    /**
+     * Get connection state of device
+     *
+     * @return device connection state
+     *
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public int getConnectionState(BluetoothDevice device) {
+        if (DBG) log("getConnectionState(" + device + ")");
+        final IBluetoothVolumeControl service = getService();
+        if (service != null && isEnabled() && isValidDevice(device)) {
+            try {
+                return service.getConnectionState(device);
+            } catch (RemoteException e) {
+                Log.e(TAG, Log.getStackTraceString(new Throwable()));
+                return BluetoothProfile.STATE_DISCONNECTED;
+            }
+        }
+        if (service == null) Log.w(TAG, "Proxy not attached to service");
+        return BluetoothProfile.STATE_DISCONNECTED;
+    }
+
+    /**
+     * Tells remote device to set an absolute volume.
+     *
+     * @param volume Absolute volume to be set on remote device.
+     *               Minimum value is 0 and maximum value is 255
+     * @hide
+     */
+    @SystemApi
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public void setVolume(@Nullable BluetoothDevice device,
+            @IntRange(from = 0, to = 255) int volume) {
+        if (DBG)
+            log("setVolume(" + volume + ")");
+        final IBluetoothVolumeControl service = getService();
+        try {
+            if (service != null && isEnabled()) {
+                service.setVolume(device, volume);
+                return;
+            }
+            if (service == null)
+                Log.w(TAG, "Proxy not attached to service");
+        } catch (RemoteException e) {
+            Log.e(TAG, "Stack:" + Log.getStackTraceString(new Throwable()));
+        }
+    }
+
+    /**
+     * Set priority of the profile
+     *
+     * <p> The device should already be paired.
+     * Priority can be one of {@link #PRIORITY_ON} or {@link #PRIORITY_OFF},
+     *
+     * @param device Paired bluetooth device
+     * @param priority
+     * @return true if priority is set, false on error
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public boolean setPriority(BluetoothDevice device, int priority) {
+        if (DBG) log("setPriority(" + device + ", " + priority + ")");
+        return setConnectionPolicy(device, BluetoothAdapter.priorityToConnectionPolicy(priority));
+    }
+
+    /**
+     * Set connection policy of the profile
+     *
+     * <p> The device should already be paired.
+     * Connection policy can be one of {@link #CONNECTION_POLICY_ALLOWED},
+     * {@link #CONNECTION_POLICY_FORBIDDEN}, {@link #CONNECTION_POLICY_UNKNOWN}
+     *
+     * @param device Paired bluetooth device
+     * @param connectionPolicy is the connection policy to set to for this profile
+     * @return true if connectionPolicy is set, false on error
+     * @hide
+     */
+    @SystemApi
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public boolean setConnectionPolicy(@NonNull BluetoothDevice device,
+            @ConnectionPolicy int connectionPolicy) {
+        if (DBG) log("setConnectionPolicy(" + device + ", " + connectionPolicy + ")");
+        final IBluetoothVolumeControl service = getService();
+        if (service != null && isEnabled() && isValidDevice(device)) {
+            if (connectionPolicy != BluetoothProfile.CONNECTION_POLICY_FORBIDDEN
+                    && connectionPolicy != BluetoothProfile.CONNECTION_POLICY_ALLOWED) {
+                return false;
+            }
+            try {
+                return service.setConnectionPolicy(device, connectionPolicy);
+            } catch (RemoteException e) {
+                Log.e(TAG, Log.getStackTraceString(new Throwable()));
+                return false;
+            }
+        }
+        if (service == null) Log.w(TAG, "Proxy not attached to service");
+        return false;
+    }
+
+    /**
+     * Get the priority of the profile.
+     *
+     * <p> The priority can be any of:
+     * {@link #PRIORITY_OFF}, {@link #PRIORITY_ON}, {@link #PRIORITY_UNDEFINED}
+     *
+     * @param device Bluetooth device
+     * @return priority of the device
+     * @hide
+     */
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public int getPriority(BluetoothDevice device) {
+        if (VDBG) log("getPriority(" + device + ")");
+        return BluetoothAdapter.connectionPolicyToPriority(getConnectionPolicy(device));
+    }
+
+    /**
+     * Get the connection policy of the profile.
+     *
+     * <p> The connection policy can be any of:
+     * {@link #CONNECTION_POLICY_ALLOWED}, {@link #CONNECTION_POLICY_FORBIDDEN},
+     * {@link #CONNECTION_POLICY_UNKNOWN}
+     *
+     * @param device Bluetooth device
+     * @return connection policy of the device
+     * @hide
+     */
+    @SystemApi
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public @ConnectionPolicy int getConnectionPolicy(@NonNull BluetoothDevice device) {
+        if (VDBG) log("getConnectionPolicy(" + device + ")");
+        final IBluetoothVolumeControl service = getService();
+        if (service != null && isEnabled() && isValidDevice(device)) {
+            try {
+                return service.getConnectionPolicy(device);
+            } catch (RemoteException e) {
+                Log.e(TAG, Log.getStackTraceString(new Throwable()));
+                return BluetoothProfile.CONNECTION_POLICY_FORBIDDEN;
+            }
+        }
+        if (service == null) Log.w(TAG, "Proxy not attached to service");
+        return BluetoothProfile.CONNECTION_POLICY_FORBIDDEN;
+    }
+
+    private boolean isEnabled() {
+        return mAdapter.getState() == BluetoothAdapter.STATE_ON;
+    }
+
+    private static boolean isValidDevice(@Nullable BluetoothDevice device) {
+        return device != null && BluetoothAdapter.checkBluetoothAddress(device.getAddress());
+    }
+
+    private static void log(String msg) {
+        Log.d(TAG, msg);
+    }
+}