How to Programmatically Adjust System Brightness on Android?

Programmatically Modifying System Brightness

Initial Attempt and Issue:

You have attempted to change the system brightness programmatically using:

<code class="java">WindowManager.LayoutParams lp = window.getAttributes();
lp.screenBrightness = (255);
window.setAttributes(lp);</code>

However, this method has proven ineffective.

Solution:

To successfully change the system brightness, you should employ the following approach:

1. Initialize Variables:

   • Declare a variable to store the desired brightness value (e.g., brightness).
   • Create a ContentResolver handle to access system settings (e.g., cResolver).
   • Obtain a reference to the current window object (e.g., window).

2. Handle Brightness Settings:

   • Set the screen brightness mode to manual to disable auto-brightness (e.g., Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL).
   • Get the current brightness level: brightness = Settings.System.getInt(cResolver, Settings.System.SCREEN_BRIGHTNESS).

3. Update Brightness:

   • Set the system brightness using the adjusted brightness variable: Settings.System.putInt(cResolver, Settings.System.SCREEN_BRIGHTNESS, brightness).
   • Modify the window attributes to match the new brightness: window.getAttributes().screenBrightness = brightness / 255f.
   • Apply the changes to the window: window.setAttributes(window.getAttributes()).

4. Manifest Permission:

   • Add the WRITE_SETTINGS permission to your AndroidManifest.xml.

5. Additional Considerations:

   • For Android API levels >= 23, you may need to request the WRITE_SETTINGS permission through an activity prompt.

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