轉載自：https://www.jb51.net/article/136383.html

1、宣告需要的許可權

<uses-permission android:name="android.permission.CHANGE_CONFIGURATION"/>
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>

2、判斷是否開啟了自動亮度調節

public static boolean isAutoBrightness(Context context) {
  ContentResolver resolver = context.getContentResolver();
  boolean automicBrightness = false;
  try {
   automicBrightness = Settings.System.getInt(resolver,
     Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
  } catch (Settings.SettingNotFoundException e) {
   e.printStackTrace();
  }
  return automicBrightness;
}
 

3、獲取當前螢幕亮度

public static int getScreenBrightness(Context context) {
  int nowBrightnessValue = 0;
  ContentResolver resolver = context.getContentResolver();
  try {
   nowBrightnessValue = android.provider.Settings.System.getInt(resolver, Settings.System.SCREEN_BRIGHTNESS);
  } catch (Exception e) {
   e.printStackTrace();
  }
  return nowBrightnessValue;
}
 

4、關閉自動亮度調節

public static boolean autoBrightness(Context activity, boolean flag) {
  int value = 0;
  if (flag) {
   value = Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; //開啟
  } else {
   value = Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;//關閉
  }
  return Settings.System.putInt(activity.getContentResolver(),
    Settings.System.SCREEN_BRIGHTNESS_MODE,
    value);
}
 

5、設定亮度，退出app也能保持該亮度值

public static void saveBrightness(Context context, int brightness) {
  ContentResolver resolver = context.getContentResolver();
  Uri uri = android.provider.Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS);
  android.provider.Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, brightness);
  resolver.notifyChange(uri, null);
}

6、設定當前activity顯示的亮度

public static void setBrightness(Activity activity, int brightness) {
  WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
  lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
  activity.getWindow().setAttributes(lp);
}