Android ApiDemos示例解析(20)：App->Alarm->Alarm Service

Alarm Service和Alarm Controller 例子非常类似，只是Alarm Service是用来Schedule一个Service，而前面的例子是来Schedule一个Broadcast。

前面说过PendingIntent ,可以来描述一个Activity ,Broadcast,或是一个Service。本例是Schedule一个Alarm事件来启动一个Service。这通常用于来执行一个较费时的任务。

关于如果编写一个Service将在后面的有专门的例子来说明，只里不详述。只要知道AlarmService_Service是一个Service就行了。

下面的代码用来Schedule一个多次Alarm事件来启动AlarmService_Service

[java]
private PendingIntent mAlarmSender;
...
// Create an IntentSender that will launch our service, to be scheduled
// with the alarm manager.
mAlarmSender = PendingIntent.getService(AlarmService.this,
0, new Intent(AlarmService.this, AlarmService_Service.class), 0);
...
// We want the alarm to go off 30 seconds from now.
long firstTime = SystemClock.elapsedRealtime();

// Schedule the alarm!
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
firstTime, 30*1000, mAlarmSender);
private PendingIntent mAlarmSender;
...
// Create an IntentSender that will launch our service, to be scheduled
// with the alarm manager.
mAlarmSender = PendingIntent.getService(AlarmService.this,
0, new Intent(AlarmService.this, AlarmService_Service.class), 0);
...
// We want the alarm to go off 30 seconds from now.
long firstTime = SystemClock.elapsedRealtime();

// Schedule the alarm!
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
firstTime, 30*1000, mAlarmSender);

取消这个Alarm事件：

[java]
// And cancel the alarm.
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
am.cancel(mAlarmSender);
// And cancel the alarm.
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
am.cancel(mAlarmSender);

作者：mapdigit

补充：移动开发 , Android ,