应用程序每 15 分钟处于恢复状态后如何调用某些任务

Question

I want to perform an action on every 15 minutes once the device become sleep mode or app is in background. I tried it with broadcast Receiver as shown below. But it's only working for first few minutes. After that the action is not happening.

BroadcastReceiver

public class KeepReceiver extends BroadcastReceiver 
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
      Log.d("Keep","status");
        context.sendBroadcast(new Intent("KEEP_RECEIVER"));
       
    }
}

sendBroadcast be like below.:

 BroadcastReceiver broadcastReceiver2 = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            
                    Log.d("Active","status");
                 
                }
            });
    

Here onReceive from KeepReceiver is called but sendBroadcast onReceive is not working after few minutes.

Methid called on onPause of main activity

private void timeout() {

        Date when = new Date(System.currentTimeMillis());
        Calendar now = Calendar.getInstance();
        now.set(Calendar.MINUTE, 0);
        now.set(Calendar.SECOND, 0);
        now.set(Calendar.MILLISECOND, 0);
        try {
            Intent someIntent = new Intent(getApplicationContext(), KeepReceiver.class); 

            PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(),0, someIntent, PendingIntent.FLAG_CANCEL_CURRENT);
            int repeatingInterval = 100000; 

            AlarmManager alarmManager =(AlarmManager)getApplicationContext().getSystemService(Activity.ALARM_SERVICE);
            alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), repeatingInterval , pendingIntent);


        } catch(Exception e) {
            e.printStackTrace();
        }
}

Please advise if anything wrong with the implementation. Thanks in advance

Answer 1

There are a few problems here. You cannot reliably set a repeating alarm at 100 second (less than 2 minute) intervals, as you are trying to do. Repeating alarms are also not accurate as Android can delay them to avoid battery drain.

To achieve a repeating alarm with 15 minute intervals, you should set a single alarm using set() or setExact() (if you need exact timing) for a time 15 minutes in the future. When that alarm goes off, do whatever you need to do and then set another alarm for 15 minutes in the future, etc.