Android App无法从在线检索数据以进行自动更新

Question

我正在尝试开发一个应用程序，可以检查自身的更新是否可用，然后提示用户是否升级。我遇到麻烦之一就是能够从在线提取应用程序版本号。假设我的url是正确的并且div类实际存在，可以安全地假设，我的代码中的问题在哪里？以下是我的代码：

点击按钮调用更新

public String url = "http://www.myurl.com"
UPDATE.setOnClickListener(new View.OnClickListener() {
        String versionString = "";

        @Override
        public void onClick(View v) {
            ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mWifi = connManager.getNetworkInfo(connManager.TYPE_WIFI);

            if (mWifi.isConnected()) {

                new VersionCheck().execute();
            }
        }
    });
//If wifi is connected then try to pull the version from offline.

private class VersionCheck extends AsyncTask<Void, Void, Void>{
    String stringVersion;
    int convertedString;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog = new ProgressDialog(UpdateActivity.this);
        progressDialog.setTitle("Checking Current Version Number");
        progressDialog.setMessage("Loading...");
        progressDialog.setIndeterminate(false);
        progressDialog.show();

    }

    @Override
    protected Void doInBackground(Void... params) {
        try{
            Document document = Jsoup.connect(URL1).get();
            Elements element = document.select("div.VERSION_NUM");
            stringVersion = element.toString();
            convertedString = Integer.parseInt(stringVersion);
        }catch (IOException ex){
            ex.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        String versionName = "";
        int cVersion;
        try {
            versionName = getPackageManager().getPackageInfo(getPackageName(), 0).versionName;
            try{
                cVersion = Integer.parseInt(versionName);
                if(convertedString > cVersion){
                        Toast.makeText(getApplicationContext(), "NEW Version :D", Toast.LENGTH_SHORT).show();
                    //Ideally create new dialog here to download the new version
                }
            }catch (NumberFormatException i){
                i.printStackTrace();
            }
        } catch (PackageManager.NameNotFoundException e) {
        }
    }
}

有任何问题请问，我会尽可能多地发布信息。 谢谢大家！