I need to use a wakelock to hold the screen active while its required.
I was recommended to use a service which I have been trying but on the
onDestroy I am getting "wl cannot be resolved". Code below:

public class WakeLockService extends Service {

        @Override
        public IBinder onBind(Intent arg0) {
                // TODO Auto-generated method stub
                return null;
        }

        public void onCreate() {
                PowerManager pm = (PowerManager) getSystemService
(Context.POWER_SERVICE);
                PowerManager.WakeLock wl = pm.newWakeLock
(PowerManager.FULL_WAKE_LOCK, "My Tag");
                wl.acquire();
        }

        public void onDestroy() {
                wl.release();
        }

}

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