获取手机分辨率

   /**
     * 获取分辨率
     */
    public static String getScreen(Context context) {
        if (context == null) {
            return "";
        }
        DisplayMetrics dm = context.getResources().getDisplayMetrics();
        int screenWidth = dm.widthPixels;
        int screenHeight = dm.heightPixels;
        return screenWidth + "*" + screenHeight;
    }