How to set the screen brightness to dim

Question

at present the following code is setting the screen brightness level to 0 but it is not dimming the screen.can somebody help me out.the android version is 4.0. thanks in advance.

android.provider.Settings.System.putInt(
 context.getContentResolver(),android.provider.Settings.System.SCREEN_BRIGHTNESS, 0);

http://programmerguru.com/android-tutorial/how-to-change-screen-brightness-programmatically/ — Nirav Ranpara, Apr 06 '16 at 06:50
@Nirav thanku for the info but even this code is not working out — akshaya, Apr 06 '16 at 07:19

score 0 · Answer 1 · answered Apr 06 '16 at 06:55

Settings.System.putInt(this.getContentResolver(),
        Settings.System.SCREEN_BRIGHTNESS, 20);

WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 0.2f; // 100 / 100.0f;
getWindow().setAttributes(lp);

startActivity(new Intent(this,RefreshScreen.class));

score 0 · Answer 2 · answered Apr 06 '16 at 06:57

Try this:

public static void wakeDevice(Context context) {
    PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
    PowerManager.WakeLock wakeLock = powerManager.newWakeLock(
            (PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.FULL_WAKE_LOCK
                    | PowerManager.ACQUIRE_CAUSES_WAKEUP), "");

    //calling this will Dim the screen
    wakeLock.acquire();

    //if  you want to release the dim state
    //wakeLock.release();
}

thanku for the info but still even this one is not working out. — akshaya, Apr 06 '16 at 09:24

How to set the screen brightness to dim

2 Answers2