android 获取和设置屏幕亮度

# 获取屏幕亮度

public static int getScreenBrightness(Activity activity) {
    int value = 0;
    ContentResolver cr = activity.getContentResolver();
    try {
        value = Settings.System.getInt(cr, Settings.System.SCREEN_BRIGHTNESS);
    } catch (SettingNotFoundException e) {
        
    }
    return value;
}

# 设置屏幕亮度

public static void setScreenBrightness(Activity activity, int value) {
    WindowManager.LayoutParams params = activity.getWindow().getAttributes();
    params.screenBrightness = value / 255f;
    activity.getWindow().setAttributes(params);
}