【Android】修改系统亮度

brightness-utils.java

 /**
  * 获取当前系统亮度
  **/
 public int getGlobalScrennBrightness(Context context) {
     int nowBrightnessValue = -1;
     ContentResolver resolver = context.getContentResolver();
     try {
         nowBrightnessValue = android.provider.Settings.System.getInt(resolver,
                                                            Settings.System.SCREEN_BRIGHTNESS);
     } catch (Exception e) {
         // Ignore
     }
     return nowBrightnessValue;
 }

 /**
  * 判断是否开启了自动亮度调节
  */
 public static boolean isAutoBrightness(ContentResolver aContentResolver) {
     boolean automicBrightness = false;
     try {
         automicBrightness = Settings.System.getInt(aContentResolver,
                 Settings.System.SCREEN_BRIGHTNESS_MODE) ==
                                              Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
     } catch (Settings.SettingNotFoundException e) {
         e.printStackTrace();
     }
     return automicBrightness;
 }

 /**
  * 停止自动亮度调节
  *
  * @param context
  */
 public void stopAutoBrightness(Context context) {
     Settings.System.putInt(context.getContentResolver(),
             Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
 }

 /**
  * 开启亮度自动调节
  *
  * @param context
  */
 public void startAutoBrightness(Context context) {
     Settings.System.putInt(context.getContentResolver(),
             Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
 }

 /**
  * 保存亮度设置状态
  *
  * @param resolver
  * @param brightness
  */
 public void saveBrightness(ContentResolver resolver, int brightness) {
     Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");
     android.provider.Settings.System.putInt(resolver, "screen_brightness", brightness);
     // resolver.registerContentObserver(uri, true, myContentObserver);
     resolver.notifyChange(uri, null);
 }