PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
WakeLock manager = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "TAG");To avoid draining the battery, an Android device that is left idle quickly falls asleep. Hence, keeping the CPU on should be avoided, unless it is absolutely necessary.
If so, developers typically use a Power Manager system service feature called wake locks by invoking PowerManager.WakeLock#newWakeLock(int levelAndFlags, String tag), along with the specific permission WAKE_LOCK in their manifest.
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
WakeLock manager = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "TAG");