AlarmManager对象配合Intent使用,可以定时开启一个Activity,发送一个BroadCast或者开启一个Service。
AlarmManager有如下用法:
(1)在指定时间后,执行某操作
- Intent intent=new Intent(this,ShowUtil.class);
- PendingIntent sender=PendingIntent.getBroadcast(this, 0, intent, 0);
- AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
- alarm.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+4*1000, sender);//4秒后执行
(2)周期性执行某动作
- Intent intent=new Intent(this,ShowUtil.class);
- PendingIntent sender=PendingIntent.getBroadcast(this, 0, intent, 0);
- AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
- alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() 5*1000, sender);//每5秒执行一次
- //alarm.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), 5*1000, sender);//每5秒执行一次
(3)关于同时定义多个定时器和关闭指定定时器
- public static PendingIntent sender1;
- public static PendingIntent sender2;
- Intent intent=new Intent(this,ShowUtil.class);
- sender1=PendingIntent.getBroadcast(this, 1, intent, 0);//第二个参数,用来标识不同的send
- sender2=PendingIntent.getBroadcast(this, 2, intent, 0);
- AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
- alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 2*1000, sender1);
- alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 5*1000, sender2);
- //在其他地方
- AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
- alarm.cancel(**.sender1);
- alarm.cancel(**.sender2);