Android 屏幕亮度调节（2.0以后出现亮度自动调节）如何开启、关闭亮度自动调节

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/**
* 停止自动亮度调节
*/
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
*/
public static 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);
}