/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.deviceidle;
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import android.bluetooth.BluetoothAdapter;
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import android.bluetooth.BluetoothDevice;
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import android.bluetooth.BluetoothManager;
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import android.bluetooth.BluetoothProfile;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.os.Handler;
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import android.os.Message;
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import com.android.internal.annotations.GuardedBy;
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import com.android.internal.annotations.VisibleForTesting;
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import com.android.server.DeviceIdleController;
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/**
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* Track whether there are any active Bluetooth devices connected.
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*/
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public class BluetoothConstraint implements IDeviceIdleConstraint {
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private static final String TAG = BluetoothConstraint.class.getSimpleName();
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private static final long INACTIVITY_TIMEOUT_MS = 20 * 60 * 1000L;
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private final Context mContext;
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private final Handler mHandler;
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private final DeviceIdleController.LocalService mLocalService;
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private final BluetoothManager mBluetoothManager;
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private volatile boolean mConnected = true;
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private volatile boolean mMonitoring = false;
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public BluetoothConstraint(
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Context context, Handler handler, DeviceIdleController.LocalService localService) {
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mContext = context;
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mHandler = handler;
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mLocalService = localService;
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mBluetoothManager = mContext.getSystemService(BluetoothManager.class);
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}
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@Override
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public synchronized void startMonitoring() {
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// Start by assuming we have a connected bluetooth device.
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mConnected = true;
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mMonitoring = true;
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// Register a receiver to get updates on bluetooth devices disconnecting or the
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// adapter state changing.
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IntentFilter filter = new IntentFilter();
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filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
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filter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
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filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
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mContext.registerReceiver(mReceiver, filter);
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// Some devices will try to stay connected indefinitely. Set a timeout to ignore them.
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mHandler.sendMessageDelayed(
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Message.obtain(mHandler, mTimeoutCallback), INACTIVITY_TIMEOUT_MS);
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// Now we have the receiver registered, make a direct check for connected devices.
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updateAndReportActiveLocked();
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}
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@Override
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public synchronized void stopMonitoring() {
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mContext.unregisterReceiver(mReceiver);
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mHandler.removeCallbacks(mTimeoutCallback);
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mMonitoring = false;
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}
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private synchronized void cancelMonitoringDueToTimeout() {
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if (mMonitoring) {
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mMonitoring = false;
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mLocalService.onConstraintStateChanged(this, /* active= */ false);
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}
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}
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/**
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* Check the latest data from BluetoothManager and let DeviceIdleController know whether we
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* have connected devices (for example TV remotes / gamepads) and thus want to stay awake.
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*/
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@GuardedBy("this")
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private void updateAndReportActiveLocked() {
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final boolean connected = isBluetoothConnected(mBluetoothManager);
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if (connected != mConnected) {
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mConnected = connected;
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// If we lost all of our connections, we are on track to going into idle state.
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mLocalService.onConstraintStateChanged(this, /* active= */ mConnected);
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}
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}
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/**
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* True if the bluetooth adapter exists, is enabled, and has at least one GATT device connected.
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*/
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@VisibleForTesting
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static boolean isBluetoothConnected(BluetoothManager bluetoothManager) {
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BluetoothAdapter adapter = bluetoothManager.getAdapter();
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if (adapter != null && adapter.isEnabled()) {
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return bluetoothManager.getConnectedDevices(BluetoothProfile.GATT).size() > 0;
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}
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return false;
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}
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/**
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* Registered in {@link #startMonitoring()}, unregistered in {@link #stopMonitoring()}.
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*/
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@VisibleForTesting
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final BroadcastReceiver mReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(intent.getAction())) {
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mLocalService.exitIdle("bluetooth");
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} else {
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updateAndReportActiveLocked();
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}
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}
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};
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private final Runnable mTimeoutCallback = () -> cancelMonitoringDueToTimeout();
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}
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