My App Crashes Just Because Wakelock "donotsleep"

My app works But when it goes to Stop service it just crashes because wakelock 'DoNotSleep' state so I will be glad to hear some advices. thats my logcat: 05-15 00:41:06.925: E/An

Solution 1:

You need to acquire the wake lock before you can release it:

http://developer.android.com/reference/android/os/PowerManager.WakeLock.html#acquire()

That's because wake locks are reference counted by default. If a wake lock is reference counted, then each call to acquire() must be balanced by an equal number of calls to release() (and vice versa). If a wake lock is reference counted and you release it more often than you acquire it (in your case you don't acquire it at all), then the WakeLock under-locked exception will be thrown.

http://developer.android.com/reference/android/os/PowerManager.WakeLock.html#setReferenceCounted(boolean)

Your code only creates a wake lock but it never acquires it. In order to balance the count, acquire it in onCreate():

publicvoidonCreate() {
    super.onCreate();

    // this only creates the wake lock without acquiring itPowerManagerpm= (PowerManager) getSystemService(Context.POWER_SERVICE);
    wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DoNotSleep");

    // this acquires the wake lock
    wakeLock.acquire();
}

Solution 2:

Before you can release the Wakelock, you must first acquire it

publicvoidonCreate() {
    super.onCreate();
    PowerManagerpm= (PowerManager) getSystemService(Context.POWER_SERVICE);
    wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DoNotSleep");

    // ADD THIS LINE
    wakeLock.acquire();
}