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Editorial Team
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Asked: 2026-06-10T20:23:20+00:00

iam setting the device settings into certain values. i want to adjust the screen

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iam setting the device settings into certain values. i want to adjust the screen brightness and the Font-Scale iam using the following code:

//For Font-Scale
Settings.System.putFloat(this.getContentResolver(),Settings.System.FONT_SCALE,(float) 1.3);
//For Brightness
Settings.System.putString(this.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS,255);

the value of the brightness does change but to set activate it i must go to the screen settings and open the brightness settings and press OK.
the value of the Font-Scale Does not change.
i think maybe a way to refresh the settings to get the new values. can any one help me?

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1 Answer

  1. Editorial Team

    This cannot be done by apps. One way to get these settings to take effect is by rebooting the phone. If you have root access you can use non-public apis. use below code to do it using reflection.

    To change brightness you need to call 

     PowerManagerService.setBacklightBrightness(brightness);

    And to change 

     ActivityManagerNative.getDefault().updatePersistentConfiguration(mCurConfig)
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