如何从Android中的多个网站获取数据

Question

从正在开发的多个网站获取数据。在第一个网站页面上，我卡住了我无法输出。  该应用应具有天然气和其他产品的当前价格，并且在其上单击时应显示该状态下的可用位置。

主要活动

. ~/.bash_profile

设置者和获取者

minikube ssh
cd /var/lib/boot2docker
sudo cp userdata.tar userdata-backup.tar
cd /home/docker
echo YOUR_SSH_PUBLIC_KEY_HERE >> .ssh/authorized_keys
sudo tar cf /var/lib/boot2docker/userdata.tar .

html解析活动

  public class MainActivity extends AppCompatActivity implements 
   ParserResponseInterface{

  private TextView headlineTextView;
  private TextView articleTextView;
  private TextView errorMessageTextView;
  private ProgressBar progressBar;

 @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    headlineTextView = (TextView) findViewById(R.id.headline);
    articleTextView = (TextView) findViewById(R.id.article);
    errorMessageTextView = (TextView) findViewById(R.id.errorMessage);
    progressBar = (ProgressBar) findViewById(R.id.progressBar);


    Log.d("oncreate()","before htmlparser   ");

    //Execute AsyncTask for Parsing HTML
    new 
    HtmlParser(this)
    .execute("https://developer.android.com/training/index.html");

    Log.d("oncreate()","eeeeeeeeeeexcute URl  ");

}


   @Override
   public void onParsingDone(ArticleModel articleModel) {

    progressBar.setVisibility(View.GONE);

    if(articleModel!=null){
        headlineTextView.setText(articleModel.getHeadline());
        Log.i("onParsingDone: ", "headlineTextView :  " 
       +headlineTextView);
        articleTextView.setText(articleModel.getArticle());
        Log.i("onParsingDone: ", "articleTextView :  " +articleTextView);
    }
    else
        errorMessageTextView.setText("Something wrong! Can't parse 
       HTML");
     }
    }

界面

  public class ArticleModel {

   private String headline;
   private String article;

  public ArticleModel(String headline, String article) {
    this.headline = headline;
    Log.i("ARTICLE MODEL","I AM IN SETTER BLOCK  headline : "+ headline);

    this.article = article;
    Log.d("ARTICLE MODEL","I AM IN SETTER BLOCK article:   "+article);
    }

    public String getHeadline() {
    Log.i("ARTICLE MODEL","I AM IN SETTER BLOCK  get headline headline : 
    "+ headline);

    return headline;
    }

    public String getArticle() {
    return article;
}
}

}

主要xml文件

  public class HtmlParser extends AsyncTask<String, Void, ArticleModel> {

  private ParserResponseInterface parserResponseInterface;

   public HtmlParser(ParserResponseInterface parserResponseInterface){
    this.parserResponseInterface = parserResponseInterface;
}

     @Override
   protected ArticleModel doInBackground(String... params) {
    Log.d("DOINBACKGROUND","I AM IN DO IN BACKGROUND  PARSE URL  ");

    String url = params[0];
    ArticleModel articleModel = null;

    String headline;
    String article = "";

    Document pageDocument;
    Elements elements;
    Elements articleElements;

    try {
        pageDocument = Jsoup.connect(url).get();
        Log.i("HTMLPARSER","I AM IN TRY BLOCK TO GET URl  ");
        elements = pageDocument.select("#body-content");
        Log.i("HTMLPARSER","I AM IN TRY BLOCK TO GET URl elements:   
       "+elements);
        articleElements = pageDocument.select(".wrap .cols .col-1of2 p");
        headline = elements.select("h1").text();
        Log.i("HTMLPARSER","I AM IN TRY BLOCK TO GET URl headline::  
     "+headline);

        for(Element element: articleElements){
            article = article + element.text() + "\n\n";

            Log.i("HTMLPARSER","I AM IN TRY BLOCK IN THAT FOR LOOP TO GET 
        URl article:: "+ article);
        }

        articleModel = new ArticleModel(headline, article);

        Log.i("HTMLPARSER","I AM IN TRY BLOCK IN THAT FOR LOOP TO GET URl 
   article model:: "+ articleModel);

    } catch (IOException e) {
        e.printStackTrace();
    }

    return articleModel;
    }