如何通过Android提取表数据

Question

我正在尝试从网页上的表格中提取数据。到目前为止，我已经能够从标题标签中提取数据——但不能提取表格数据。如何使用下面显示的源来实现这一点？

资料来源：

public class MainActivity extends Activity {

TextView tv;
final String URL="http://example.com";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

tv = (TextView) findViewById(R.id.TextView01);
new MyTask().execute(URL);
}

private class MyTask extends AsyncTask<String, Void, String> {
ProgressDialog prog;
String title = "";
@Override
protected void onPreExecute() {
      prog = new ProgressDialog(MainActivity.this);
      prog.setMessage("Loading....");
      prog.show();
}
@Override
protected String doInBackground(String... params) {
    try {
        Document doc = Jsoup.connect(params[0]).get();
        title = doc.title();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return title;
}
@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);
    prog.dismiss();
    tv.setText(result);
}

}
}

编辑——回应马泰·斯皮利的以下评论：

public class MainActivity extends Activity {

TextView tv;
final String URL="http://example.com";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

tv = (TextView) findViewById(R.id.TextView01);
new MyTask().execute(URL);
}

private class MyTask extends AsyncTask<String, Void, String> {
ProgressDialog prog;
String title = "";
@Override
protected void onPreExecute() {
      prog = new ProgressDialog(MainActivity.this);
      prog.setMessage("Loading....");
      prog.show();
}
@Override
protected String doInBackground(String... params) {
    try {
        Document doc = Jsoup.connect(params[0]).get();
        Element tableHeader = doc.select("tr").first();


        for( Element element : tableHeader.children() )
        {
            // Here you can do something with each element
            System.out.println(element.text());
            tv.setText(element.text());
        }

        title = doc.title();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return title;
}
@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);
    prog.dismiss();
    tv.setText(result);
}
}
}

^-（导致错误：android.view.ViewRootImpl$CalledFromErrorThreadException：只有创建视图层次结构的原始线程才能接触其视图）

Answer 1

将要更新的视图作为MyTask的构造函数参数传递，例如

新建MyTask（电视）。执行（URL）

相应地更改MyTask以接受此参数。