小编mun*_* ss的帖子

class background_thread extends AsyncTask<String ,String , Boolean > {

    protected Boolean doInBackground(String... params) {

        String UR = "127.0.0.1/abc/index.php";
        try {
            URL url = new URL(UR);
        } catch(MalformedURLException e) {
            e.printStackTrace();
        }

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    }

}

当我使用上面的代码时,在HttpURLConnection中,url变为红色并且Android Studio显示错误无法解析符号url.代码有什么问题？