Example of Android implementing user online heartbeat function based on AlarmManager

This article describes the implementation of user online heartbeat function based on AlarmManager. Share it for your reference, as follows:

Heartbeat should be used when doing instant communication or other operations such as checking whether it is online. The most commonly used AlarmManager global timer is implemented.

The use mechanism of AlarmManager is called a global timer, and some is called an alarm clock. In fact, its function is somewhat similar to Timer. There are two similar uses: (1)Perform an action after a specified duration（2）Perform an operation periodically

The AlarmManager object can be used in conjunction with Intent, and can be enabled regularly, a BroadCast is sent, or a Service is enabled.

The following code introduces the use of two timing methods in detail:

(1) Perform an operation after the specified time

//Operation: Send a broadcast, and after the broadcast is received, Toast prompts the timing operation to be completed. Intent intent =new Intent(, );("short");
PendingIntent sender= (, 0, intent, 0);
//Set a time after five secondsCalendar calendar=();
(());
(, 5);
AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
(AlarmManager.RTC_WAKEUP, (), sender);
//or simplify the following//(AlarmManager.RTC_WAKEUP, ()+5*1000, sender);
(, "Alarm is turned on in five seconds", Toast.LENGTH_LONG).show();

Note: Remember to register

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

(2) Perform a certain operation periodically

Intent intent =new Intent(, );
("repeating");
PendingIntent sender=PendingIntent
.getBroadcast(, 0, intent, 0);
//Start timelong firstime=();
AlarmManager am=(AlarmManager)getSystemService(ALARM_SERVICE);//5 seconds per cycle, constantly sending broadcasts(AlarmManager.ELAPSED_REALTIME_WAKEUP, firstime, 5*1000, sender);

AlarmManagersetRepeating()Equivalent to TimerSchedule(task,delay,peroid);The difference is that Timer method specifies how long it takes to start periodic execution of tasks;

Cancel of AlarmManager: (It should be noted that the cancelled Intent must be absolutely consistent with the startup Intent to support cancellation of AlarmManager)

Intent intent =new Intent(, );
("repeating");
PendingIntent sender=(, 0, intent, 0);
AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
(sender);

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I hope this article will be helpful to everyone's Android programming design.