Android基于AlarmManager实现用户在线心跳功能示例

//操作：发送一个广播，广播接收后Toast提示定时操作完成   Intent intent =new Intent(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);//或者以下面方式简化//alarm.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+5*1000, sender);Toast.makeText(Main.this, "五秒后alarm开启", Toast.LENGTH_LONG).show();