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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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 com.android.systemui;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.UserHandle;
import android.util.Log;
import android.view.SurfaceControl;
import com.android.systemui.shared.recents.IOverviewProxy;
import com.android.systemui.shared.recents.ISystemUiProxy;
import com.android.systemui.OverviewProxyService.OverviewProxyListener;
import com.android.systemui.statusbar.policy.CallbackController;
import com.android.systemui.statusbar.policy.DeviceProvisionedController;
import com.android.systemui.statusbar.policy.DeviceProvisionedController.DeviceProvisionedListener;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
/**
* Class to send information from overview to launcher with a binder.
*/
public class OverviewProxyService implements CallbackController<OverviewProxyListener>, Dumpable {
private static final String TAG = "OverviewProxyService";
private static final long BACKOFF_MILLIS = 5000;
private final Context mContext;
private final Handler mHandler;
private final Runnable mConnectionRunnable = this::startConnectionToCurrentUser;
private final DeviceProvisionedController mDeviceProvisionedController
= Dependency.get(DeviceProvisionedController.class);
private final List<OverviewProxyListener> mConnectionCallbacks = new ArrayList<>();
private IOverviewProxy mOverviewProxy;
private int mConnectionBackoffAttempts;
private ISystemUiProxy mSysUiProxy = new ISystemUiProxy.Stub() {
public Bitmap screenshot(Rect sourceCrop, int width, int height, int minLayer, int maxLayer,
boolean useIdentityTransform, int rotation) {
long token = Binder.clearCallingIdentity();
try {
return SurfaceControl.screenshot(sourceCrop, width, height, minLayer, maxLayer,
useIdentityTransform, rotation);
} finally {
Binder.restoreCallingIdentity(token);
}
}
};
private final ServiceConnection mOverviewServiceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
if (service != null) {
mConnectionBackoffAttempts = 0;
mOverviewProxy = IOverviewProxy.Stub.asInterface(service);
// Listen for launcher's death
try {
service.linkToDeath(mOverviewServiceDeathRcpt, 0);
} catch (RemoteException e) {
Log.e(TAG, "Lost connection to launcher service", e);
}
try {
mOverviewProxy.onBind(mSysUiProxy);
} catch (RemoteException e) {
Log.e(TAG, "Failed to call onBind()", e);
}
notifyConnectionChanged();
}
}
@Override
public void onServiceDisconnected(ComponentName name) {
// Do nothing
}
};
private final DeviceProvisionedListener mDeviceProvisionedCallback =
new DeviceProvisionedListener() {
@Override
public void onUserSetupChanged() {
if (mDeviceProvisionedController.isCurrentUserSetup()) {
startConnectionToCurrentUser();
}
}
@Override
public void onUserSwitched() {
mConnectionBackoffAttempts = 0;
startConnectionToCurrentUser();
}
};
// This is the death handler for the binder from the launcher service
private final IBinder.DeathRecipient mOverviewServiceDeathRcpt = new IBinder.DeathRecipient() {
@Override
public void binderDied() {
startConnectionToCurrentUser();
}
};
public OverviewProxyService(Context context) {
mContext = context;
mHandler = new Handler();
mConnectionBackoffAttempts = 0;
mDeviceProvisionedController.addCallback(mDeviceProvisionedCallback);
}
public void startConnectionToCurrentUser() {
disconnectFromLauncherService();
// If user has not setup yet or already connected, do not try to connect
if (!mDeviceProvisionedController.isCurrentUserSetup()) {
return;
}
mHandler.removeCallbacks(mConnectionRunnable);
Intent launcherServiceIntent = new Intent();
launcherServiceIntent.setComponent(ComponentName.unflattenFromString(
mContext.getString(R.string.config_overviewServiceComponent)));
boolean bound = mContext.bindServiceAsUser(launcherServiceIntent,
mOverviewServiceConnection, Context.BIND_AUTO_CREATE,
UserHandle.getUserHandleForUid(mDeviceProvisionedController.getCurrentUser()));
if (!bound) {
// Retry after exponential backoff timeout
final long timeoutMs = (long) Math.scalb(BACKOFF_MILLIS, mConnectionBackoffAttempts);
mHandler.postDelayed(mConnectionRunnable, timeoutMs);
mConnectionBackoffAttempts++;
}
}
@Override
public void addCallback(OverviewProxyListener listener) {
mConnectionCallbacks.add(listener);
listener.onConnectionChanged(mOverviewProxy != null);
}
@Override
public void removeCallback(OverviewProxyListener listener) {
mConnectionCallbacks.remove(listener);
}
public IOverviewProxy getProxy() {
return mOverviewProxy;
}
private void disconnectFromLauncherService() {
if (mOverviewProxy != null) {
mOverviewProxy.asBinder().unlinkToDeath(mOverviewServiceDeathRcpt, 0);
mContext.unbindService(mOverviewServiceConnection);
mOverviewProxy = null;
notifyConnectionChanged();
}
}
private void notifyConnectionChanged() {
for (int i = mConnectionCallbacks.size() - 1; i >= 0; --i) {
mConnectionCallbacks.get(i).onConnectionChanged(mOverviewProxy != null);
}
}
@Override
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
pw.println(TAG + " state:");
pw.print(" mConnectionBackoffAttempts="); pw.println(mConnectionBackoffAttempts);
pw.print(" isCurrentUserSetup="); pw.println(mDeviceProvisionedController
.isCurrentUserSetup());
pw.print(" isConnected="); pw.println(mOverviewProxy != null);
}
public interface OverviewProxyListener {
void onConnectionChanged(boolean isConnected);
}
}
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