Android開(kāi)發(fā)實(shí)現(xiàn)調(diào)節(jié)屏幕亮度功能

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

/**
* 判斷是否開(kāi)啟了自動(dòng)亮度調(diào)節(jié)
*/
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;
}
/**
* 獲取屏幕的亮度
*/
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;
}
/**
* 設(shè)置當(dāng)前Activity顯示時(shí)的亮度
* 屏幕亮度最大數(shù)值一般為255，各款手機(jī)有所不同
* screenBrightness 的取值范圍在[0,1]之間
*/
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);
}
/**
* 開(kāi)啟關(guān)閉自動(dòng)亮度調(diào)節(jié)
*/
public static boolean autoBrightness(Context activity, boolean flag) {
  int value = 0;
  if (flag) {
   value = Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; //開(kāi)啟
  } else {
   value = Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;//關(guān)閉
  }
  return Settings.System.putInt(activity.getContentResolver(),
    Settings.System.SCREEN_BRIGHTNESS_MODE,
    value);
}
/**
* 保存亮度設(shè)置狀態(tài)，退出app也能保持設(shè)置狀態(tài)
*/
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);
}