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In my application, I need to do some task at midnight of the everyday. I achieved this using AlarmManager and service, but when my task starts it wakeup the device and launches the app. How can I do that like WhatsApp in the background?

Nikhil
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  • Please have a look at the official [doc](https://developer.android.com/guide/components/foreground-services) and [implementing startForeground for a service?](https://stackoverflow.com/questions/6397754/android-implementing-startforeground-for-a-service) – rahat Jan 26 '21 at 08:39

2 Answers2

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service used for it.

You have create another class then, you have extend Service

public class service extends Service {

// declaring object of MediaPlayer
private MediaPlayer player;

public service() {
}
@Override
public int onStartCommand(Intent intent, int flags, int startId){
    onTaskRemoved(intent);
    Toast.makeText(getApplicationContext(),"This is a Service running in Background",
            Toast.LENGTH_SHORT).show();
    player = MediaPlayer.create(getApplicationContext(),R.raw.ringtone);
    player.start();
    startForegroundService(intent);
    return START_STICKY;
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onTaskRemoved(Intent rootIntent) {
    Intent restartServiceIntent = new Intent(getApplicationContext(),this.getClass());
    restartServiceIntent.setPackage(getPackageName());
    startService(restartServiceIntent);
    super.onTaskRemoved(rootIntent);
}
@Override
public ComponentName startForegroundService(final Intent service) {
    return startForegroundService(service);
}
}

To run the source code you have write

Intent intent = new Intent(this, service.class);
ContextCompat.startForegroundService(this,intent);

Alternatively, you can use

startService(new Intent(getApplicationContext(),service.class));

Sometimes above source code works in background in API level 22. Sometimes it gives error. Sometimes it doesn't work.

Here's the git repo

  • Note : I ran a music from `raw`. You have to replace it with your source code. –  Jan 26 '21 at 09:22
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You can use WorkManager, that is the best way IMHO. I use it for background processing and it works like a charm. https://developer.android.com/topic/libraries/architecture/workmanager

KotlinIsland
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