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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.bluetooth;
     18 
     19 import android.app.Service;
     20 import android.bluetooth.BluetoothA2dp;
     21 import android.bluetooth.BluetoothAdapter;
     22 import android.bluetooth.BluetoothDevice;
     23 import android.bluetooth.BluetoothHeadset;
     24 import android.bluetooth.BluetoothProfile;
     25 import android.content.BroadcastReceiver;
     26 import android.content.Context;
     27 import android.content.Intent;
     28 import android.os.PowerManager;
     29 import android.util.Log;
     30 
     31 public final class DockEventReceiver extends BroadcastReceiver {
     32 
     33     private static final boolean DEBUG = DockService.DEBUG;
     34 
     35     private static final String TAG = "DockEventReceiver";
     36 
     37     public static final String ACTION_DOCK_SHOW_UI =
     38         "com.android.settings.bluetooth.action.DOCK_SHOW_UI";
     39 
     40     private static final int EXTRA_INVALID = -1234;
     41 
     42     private static final Object sStartingServiceSync = new Object();
     43 
     44     private static PowerManager.WakeLock sStartingService;
     45 
     46     @Override
     47     public void onReceive(Context context, Intent intent) {
     48         if (intent == null)
     49             return;
     50 
     51         int state = intent.getIntExtra(Intent.EXTRA_DOCK_STATE, intent.getIntExtra(
     52                 BluetoothAdapter.EXTRA_STATE, EXTRA_INVALID));
     53         BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
     54 
     55         if (DEBUG) {
     56             Log.d(TAG, "Action: " + intent.getAction() + " State:" + state + " Device: "
     57                     + (device == null ? "null" : device.getAliasName()));
     58         }
     59 
     60         if (Intent.ACTION_DOCK_EVENT.equals(intent.getAction())
     61                 || ACTION_DOCK_SHOW_UI.endsWith(intent.getAction())) {
     62             if (device == null) {
     63                 if (DEBUG) Log.d(TAG, "Device is missing");
     64                 return;
     65             }
     66 
     67             switch (state) {
     68                 case Intent.EXTRA_DOCK_STATE_UNDOCKED:
     69                 case Intent.EXTRA_DOCK_STATE_CAR:
     70                 case Intent.EXTRA_DOCK_STATE_DESK:
     71                 case Intent.EXTRA_DOCK_STATE_LE_DESK:
     72                 case Intent.EXTRA_DOCK_STATE_HE_DESK:
     73                     Intent i = new Intent(intent);
     74                     i.setClass(context, DockService.class);
     75                     beginStartingService(context, i);
     76                     break;
     77                 default:
     78                     Log.e(TAG, "Unknown state: " + state);
     79                     break;
     80             }
     81         } else if (BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED.equals(intent.getAction()) ||
     82                    BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED.equals(intent.getAction())) {
     83             int newState = intent.getIntExtra(BluetoothProfile.EXTRA_STATE,
     84                     BluetoothProfile.STATE_CONNECTED);
     85             int oldState = intent.getIntExtra(BluetoothProfile.EXTRA_PREVIOUS_STATE, 0);
     86 
     87             /*
     88              *  Reconnect to the dock if:
     89              *  1) it is a dock
     90              *  2) it is disconnected
     91              *  3) the disconnect is initiated remotely
     92              *  4) the dock is still docked (check can only be done in the Service)
     93              */
     94             if (device == null) {
     95                 if (DEBUG) Log.d(TAG, "Device is missing");
     96                 return;
     97             }
     98 
     99             if (newState == BluetoothProfile.STATE_DISCONNECTED &&
    100                     oldState != BluetoothProfile.STATE_DISCONNECTING) {
    101                 // Too bad, the dock state can't be checked from a BroadcastReceiver.
    102                 Intent i = new Intent(intent);
    103                 i.setClass(context, DockService.class);
    104                 beginStartingService(context, i);
    105             }
    106 
    107         } else if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(intent.getAction())) {
    108             int btState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
    109             if (btState != BluetoothAdapter.STATE_TURNING_ON) {
    110                 Intent i = new Intent(intent);
    111                 i.setClass(context, DockService.class);
    112                 beginStartingService(context, i);
    113             }
    114         }
    115     }
    116 
    117     /**
    118      * Start the service to process the current event notifications, acquiring
    119      * the wake lock before returning to ensure that the service will run.
    120      */
    121     private static void beginStartingService(Context context, Intent intent) {
    122         synchronized (sStartingServiceSync) {
    123             if (sStartingService == null) {
    124                 PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
    125                 sStartingService = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
    126                         "StartingDockService");
    127             }
    128 
    129             sStartingService.acquire();
    130 
    131             if (context.startService(intent) == null) {
    132                 Log.e(TAG, "Can't start DockService");
    133             }
    134         }
    135     }
    136 
    137     /**
    138      * Called back by the service when it has finished processing notifications,
    139      * releasing the wake lock if the service is now stopping.
    140      */
    141     public static void finishStartingService(Service service, int startId) {
    142         synchronized (sStartingServiceSync) {
    143             if (sStartingService != null) {
    144                 if (DEBUG) Log.d(TAG, "stopSelf id = " + startId);
    145                 if (service.stopSelfResult(startId)) {
    146                     Log.d(TAG, "finishStartingService: stopping service");
    147                     sStartingService.release();
    148                 }
    149             }
    150         }
    151     }
    152 }
    153