Android中对闹钟Alarm的事件处理

之前的博文一直在持续分享Phone相关的知识也算是知识笔记，但在工作中难免遇到其它模块的一些问题，因此在解决这些问题的时候顺手将这些知识记录并分享出来。有些知识在不知道的时候会认为很难，当了解之后便会觉得很容易。同时部分知识也是具有时效性的，比如随着Android版本的更迭，Phone的架构变化等等，因此希望自己的笔记能够帮助到一些童鞋，这样就足够了。

转载请务必注明出处：http://blog.csdn.net/yihongyuelan

Android中如果闹钟响起时，而应用需要对此做一些处理应该怎么办呢？首先我们需要接收到该事件，之后再考虑是关闭(stop)还是小睡(snooze)。在代码packages/apps/DeskClock/src/com/android/deskclock/alarms/AlarmService.java 中有如下描述：

35  // A public action send by AlarmService when the alarm has started.36  public static final String ALARM_ALERT_ACTION = "com.android.deskclock.ALARM_ALERT";3738  // A public action sent by AlarmService when the alarm has stopped for any reason.39  public static final String ALARM_DONE_ACTION = "com.android.deskclock.ALARM_DONE";

通过查看注释可以知道，系统提供了两个Action用于广播闹钟事件，包括：com.android.deskclock.ALARM_ALERT和com.android.deskclock.ALARM_DONE，即当闹钟响起时触发com.android.deskclock.ALARM_ALERT，而当闹钟停止或者小睡时触发com.android.deskclock.ALARM_DONE。也就说需要监听广播事件就注册一个广播监听器：

IntentFilter filter = new IntentFilter();filter.addAction("com.android.deskclock.ALARM_ALERT");filter.addAction("com.android.deskclock.ALARM_DONE");registerReceiver(mReceiver, filter);

这里的mReceiver是BroadCastReceiver的对象，在onReceive中处理事件。当闹钟响起时，弹出的界面是AlarmActivity.java路径位于：packages/apps/DeskClock/src/com/android/deskclock/alarms/AlarmActivity.java，在该类中提供了两个重要的闹钟操作接口，即stop和snooze，可以看到如下描述：

49    // AlarmActivity listens for this broadcast intent, so that other applications50    // can snooze the alarm (after ALARM_ALERT_ACTION and before ALARM_DONE_ACTION).51    public static final String ALARM_SNOOZE_ACTION = "com.android.deskclock.ALARM_SNOOZE";5253    // AlarmActivity listens for this broadcast intent, so that other applications54    // can dismiss the alarm (after ALARM_ALERT_ACTION and before ALARM_DONE_ACTION).55    public static final String ALARM_DISMISS_ACTION = "com.android.deskclock.ALARM_DISMISS";

该方法提供了两个广播接收的接口分别是com.android.deskclock.ALARM_SNOOZE和com.android.deskclock.ALARM_DISMISS，前者用于snooze后者用于stop。在AlarmActivity中可以看到对该action的处理，如下：

184        IntentFilter filter = new IntentFilter(AlarmService.ALARM_DONE_ACTION);185        filter.addAction(ALARM_SNOOZE_ACTION);186        filter.addAction(ALARM_DISMISS_ACTION);187        registerReceiver(mReceiver, filter);118    private BroadcastReceiver mReceiver = new BroadcastReceiver() {119        @Override120        public void onReceive(Context context, Intent intent) {121            String action = intent.getAction();122            Log.v("AlarmActivity - Broadcast Receiver - " + action);123            if (action.equals(ALARM_SNOOZE_ACTION)) {124                snooze();125            } else if (action.equals(ALARM_DISMISS_ACTION)) {126                dismiss();127            } else if (action.equals(AlarmService.ALARM_DONE_ACTION)) {128                finish();129            } else {130                Log.i("Unknown broadcast in AlarmActivity: " + action);131            }132        }133    };

也就是说可以在代码中通过使用广播的方式来控制闹钟的stop和snooze：

private void stopAlarm() {    Intent intent = new Intent();    intent.setAction("com.android.deskclock.ALARM_DISMISS");    sendBroadcast(intent);}    private void snoozeAlarm() {    Intent intent = new Intent();    intent.setAction("com.android.deskclock.ALARM_SNOOZE");    sendBroadcast(intent);}

最后附上Demo，当闹钟响起时接收并将其Stop/Snooze，代码如下：

  private void stopAlarm() {    Intent intent = new Intent();    intent.setAction("com.android.deskclock.ALARM_DISMISS");    sendBroadcast(intent);  }   private void snoozeAlarm() {    Intent intent = new Intent();    intent.setAction("com.android.deskclock.ALARM_SNOOZE");    sendBroadcast(intent);  }  Handler mHandler = new Handler(){    @Override    public void handleMessage(Message msg) {      switch (msg.what) {        case 0:          Log.i("Seven", "stop alarm");          stopAlarm();          break;        case 1:          Log.i("Seven", "snooze alarm");          snoozeAlarm();          break;        default:          break;      }    }  };   private void registerAlarmReceiver() {    mReceiver = new MyReceiver();    IntentFilter filter = new IntentFilter();    filter.addAction("com.android.deskclock.ALARM_ALERT");    filter.addAction("com.android.deskclock.ALARM_DONE");    registerReceiver(mReceiver, filter);  }  class MyReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {      if (intent.getAction().equals("com.android.deskclock.ALARM_ALERT")) {        Log.i("Seven","ALARM_ALERT");        mHandler.sendEmptyMessageDelayed(0,15); //stop alarm        //mHandler.sendEmptyMessageDelayed(1,15); //snooze alarm      }else if (intent.getAction().equals("com.android.deskclock.ALARM_DONE")) {        Log.i("Seven","ALARM_DONE");      }    }  }

这里可能有的人会感觉奇怪，为什么不直接调用stopAlarm和snoozeAlarm而是使用handler的sendEmptyMessageDelayed方法。如果直接使用stopAlarm和snoozeAlarm方法会没有效果，最少需要延迟15ms才会有作用。

最后加上一些英文的翻译，以便国外的童鞋也能获得一些帮助。

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