android 屏幕亮度

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import android.app.Activity;  import android.content.ContentResolver;  import android.net.Uri;  import android.provider.Settings;  import android.provider.Settings.SettingNotFoundException;  import android.view.WindowManager;    /**  * 处理屏幕亮度的工具类  *   * @author Administrator  *   */  public class BrightnessUtil {      /**      * 判断是否开启了自动亮度调节      *       * @param activity      * @return      */      public static boolean isAutoBrightness(Activity activity) {          boolean isAutoAdjustBright = false;          try {              isAutoAdjustBright = Settings.System.getInt(                      activity.getContentResolver(),                      Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;          } catch (SettingNotFoundException e) {              e.printStackTrace();          }          return isAutoAdjustBright;      }        /**      * 获取屏幕的亮度      *       * @param activity      * @return      */      public static int getScreenBrightness(Activity activity) {          int brightnessValue = 0;          try {              brightnessValue = android.provider.Settings.System.getInt(                      activity.getContentResolver(),                      Settings.System.SCREEN_BRIGHTNESS);          } catch (Exception e) {              e.printStackTrace();          }          return brightnessValue;      }        /**      * 设置屏幕亮度      *       * @param activity      * @param brightness      */      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);      }        /**      * 关闭亮度自动调节      *       * @param activity      */      public static void stopAutoBrightness(Activity activity) {          Settings.System.putInt(activity.getContentResolver(),                  Settings.System.SCREEN_BRIGHTNESS_MODE,                  Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);      }        /**      * 开启亮度自动调节      *       * @param activity      */        public static void startAutoBrightness(Activity activity) {          Settings.System.putInt(activity.getContentResolver(),                  Settings.System.SCREEN_BRIGHTNESS_MODE,                  Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);      }        /**      * 保存亮度设置状态      *       * @param activity      * @param brightness      */      public static void saveBrightness(Activity activity, int brightness) {          Uri uri = android.provider.Settings.System                  .getUriFor("screen_brightness");          ContentResolver resolver = activity.getContentResolver();          android.provider.Settings.System.putInt(resolver, "screen_brightness",                  brightness);          resolver.notifyChange(uri, null);      }    }
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