Keep screen on when the Activity running using power manager

First of all make the object of the Power manage.

protected PowerManager.WakeLock mWakeLock;


Now in onCreate method use the following to make the screen ON in the particular activity.

final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
this.mWakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "My Tag");
this.mWakeLock.acquire();