AlarmManager not working in sleep mode
alarmmanager, android, android-alarms
Solution
It is because your `PendingIntent` is calling to a service and not to a `BroadcastReceiver` which means the device can go back to sleep before your service is even created. If you move to a broadcast receiver it "should" stay awake until the onReceive is complete of the BroadcastReceiver which means you will have time to get a wakelock and start your service. Even if you move to a `BroadcastReceiver` you will want to acquire a wakelock until you have completed your processing if it's going to take more than 10 seconds (which is the limit of a `BroadcastReceiver`).
This is taken from paragraph 2 of the android documentation of AlarmManager:
"... If your alarm receiver called `Context.startService()`, it is possible that the phone will sleep before the requested service is launched. To prevent this, your BroadcastReceiver and Service will need to implement a separate wake lock policy to ensure that the phone continues running until the service becomes available."
Problem
I have set an AlarmManagr with a repeat time. Here is my method by which I am setting it: ``` public void setAlarmManager(Context context, Intent intent) { PendingIntent pendingIntent; pendingIntent = PendingIntent.getService(context, 0, intent, 0); AlarmManager alarmManager = (AlarmManager)context.getSystemService(context.ALARM_SERVICE); Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.add(Calendar.SECOND, 10); alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 40000, pendingIntent); } ``` This works fine except when my device goes into sleep mode the the alarm stops working until I awake my device manually. After waking the device the AlarmManager start working again. How to keep the manager running even in sleep mode?