Question

我正在连接到一个网站，我从那里获取新闻并将它们列入清单。当我点击新闻（标题）时，我想去另一个页面，在那里我可以看到新闻的内容。我正在使用jsoup这样做。 Logcat没有给我任何错误，但当我点击标题时，应用程序会崩溃。

这是我的活动：

公共类TargetActivity1扩展了Activity { ListView lista;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.web);

    Parse parsing = new Parse();
    parsing.execute();

}

private class Parse extends AsyncTask<Void, Void, Void> {

    String desc;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

    }

    @Override
    protected Void doInBackground(Void... params) {
        try {
            // Connect to the web site
            Document document = Jsoup.connect(
                    "http://www.polimi.it/en/news/").get();
            // Using Elements to get the Meta data
            Elements description = document.select("div .news-list-item a");
            // Locate the content attribute
            desc = description.attr("href");

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

    @Override
    protected void onPostExecute(Void result) {
        // Set description into TextView
        WebView txtdesc = (WebView) findViewById(R.id.webView2);

        txtdesc.addView(txtdesc);

        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(desc));
        startActivity(i);
        txtdesc.removeAllViews();

    }

}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:

        Intent myIntent = new Intent(getApplicationContext(),
                MainActivity.class);
        startActivityForResult(myIntent, 0);

        return true;

    }
    return super.onOptionsItemSelected(item);
}

}

Answer 1

你的Parse课程错了，应该是这样的：

private class Parse extends AsyncTask<Void, Void, String> {

    @Override
    protected String doInBackground(Void... params) {
        String desc = "";
        try {
            // Connect to the web site
            Document document = Jsoup.connect(
                    "http://www.polimi.it/en/news/").get();
            // Using Elements to get the Meta data
            Elements description = document.select("div .news-list-item a");
            // Locate the content attribute
            desc = description.attr("href");

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

    @Override
    protected void onPostExecute(String result) {
        // Set description into TextView
        WebView txtdesc = (WebView) findViewById(R.id.webView2);

        txtdesc.addView(txtdesc); // adding txtdesc to txtdesc? it's wrong, bug

        Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(result));
        startActivity(i);

        txtdesc.removeAllViews();

    }
}

请在此处阅读有关AsyncTask http://developer.android.com/reference/android/os/AsyncTask.html的信息。如上所述，doInBackground的结果可以传递给onPostExecute。另请注意，您正在尝试为自己添加视图，我已对此进行了评论。

使用jsoup访问新闻内容

1 个答案: