不推荐使用Android FULL_WAKE_LOCK，但不推荐使用PARTIAL_WAKE_LOCK

Question

Here i mentioned the code for waking up the screen. i want the code is listen still the app is closed and the cpu is cleared and user can click the power button when ever my screen is unlock the app is sync like whatsapp.

    PowerManager pm =  (PowerManager)getSystemService(Context.POWER_SERVICE); 
    wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "whatever");
    super.onCreate(savedInstanceState);
    wl.acquire();

Answer 1

FULL_WAKE_LOCK is already deprecated and it's better to use the PARTIAL_WAKE_LOCK . This is the standard way to do this,

PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
Wakelock wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
        "MyWakelockTag");
wakeLock.acquire();

For more way of implementation kindly visit the official link,

https://developer.android.com/training/scheduling/wakelock.html

Answer 2

Well you can consider an alternate, using JobScheduler for running background tasks while the app is still sleep for longer time thus preserving the battery. JobScheduler provides many methods to define job-execution conditions, therefore we can leverage that but it can be used for apps which are using Android 5.0 (API level 21) & above.