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PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
boolean screenOn = pm.isScreenOn();
if (!screenOn) {
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP
| PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "bright");
wl.acquire();
wl.release();
}