AlarmManager的使用

节约纸巾 · 发表于 2013-8-28 16:30

5AlarmManager--全局定时器

（1）在指定时长后执行某项操作

// 发送一个广播，广播接收后Toast提示定时操作完成
Intent intent =newIntent(MAIn.this, alarmreceiver.class);
intent.setAction("short");
PendingIntent sender=PendingIntent.getBroadcast(Main.this, 0, intent, 0);
// 设定一个五秒后的时间
Calendar calendar=Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 5);       AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
alarm.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);

Toast.makeText(Main.this, "五秒后alarm开启", Toast.LENGTH_LONG).show();

（2）周期性的执行某项操作

Intent intent =newIntent(Main.this, alarmreceiver.class);
intent.setAction("repeating");
PendingIntent  sender=PendingIntent       .getBroadcast(Main.this, 0, intent, 0);
//开始时间
long firstime=SystemClock.elapsedRealtime();
AlarmManager am=(AlarmManager)getSystemService(ALARM_SERVICE);
//5秒一个周期，不停的发送广播 am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, firstime, 5*1000, sender);

//注意：receiver记得在manifest.xml注册

public static class alarmreceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
if
(intent.getAction().equals("short")){
Toast.makeText(context, "short alarm",Toast.LENGTH_LONG).show();
}else{
Toast.makeText(context, "repeating alarm", Toast.LENGTH_LONG).show();
}
}
}

AlarmManager的取消：（其中需要注意的是取消的Intent必须与启动Intent保持绝对一致才能支持取消AlarmManager）

Intent intent =new Intent(Main.this, alarmreceiver.class);
intent.setAction("repeating");
PendingIntent sender=PendingIntent.getBroadcast(Main.this, 0, intent, 0);
AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
alarm.cancel(sender);

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[教程] AlarmManager的使用

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