尝试使用AsyncTask和Jsoup从URL获取文本，但文本不显示

Question

这些URL只是像www.example.com/example.txt这样的文本文件，因此我需要做的是从网站获取整个文本。 文本最长可能达到1MB。 我不知道为什么我的代码不起作用。 当我运行代码时，对话框会出现并消失，但是文本没有加载，并且没有出现任何错误。

这是我的代码的一部分

    public class Story extends Activity {

    Elements elem = null;
    Document document;
    String url = "http://www.example.com/example.txt";
    ProgressDialog progressDialog;

private class Title extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog = new ProgressDialog(Story.this);
        progressDialog.setMessage("Loading");
        progressDialog.setIndeterminate(false);
        progressDialog.setCancelable(false);
        progressDialog.show();
    }


    @Override
    protected Void doInBackground(Void... params) {
        try {
           document = Jsoup.connect(url).get();              
        } catch (IOException e) {
            e.printStackTrace();
        }

        elem = document.select("*");
        return null;
    }


    @Override
    protected void onPostExecute(Void result) {
        for (Element element : elem){
            String valueofelement = element.text();
            story.add(valueofelement);        //story is an a
            progressDialog.dismiss();
        }
    }
}

我用new Title().execute();称呼它new Title().execute();

这是LogCat

    11-29 17:13:07.563: D/KenBurnsView(15380): swapImage active=0
11-29 17:13:07.563: D/KenBurnsView(15380): new active=1
11-29 17:13:07.568: D/KenBurnsView(15380): starting Ken Burns animation android.view.ViewPropertyAnimator@42d5bfb8
11-29 17:13:18.103: D/AbsListView(18123): Get MotionRecognitionManager
11-29 17:13:18.178: D/dalvikvm(18123): GC_FOR_ALLOC freed 51K, 9% free 12366K/13447K, paused 22ms, total 22ms
11-29 17:13:18.183: I/dalvikvm-heap(18123): Grow heap (frag case) to 13.915MB for 971248-byte allocation
11-29 17:13:18.208: D/dalvikvm(18123): GC_CONCURRENT freed 2K, 8% free 13312K/14407K, paused 12ms+1ms, total 24ms
11-29 17:13:18.233: D/dalvikvm(18123): GC_FOR_ALLOC freed <1K, 8% free 13313K/14407K, paused 15ms, total 15ms
11-29 17:13:18.243: I/dalvikvm-heap(18123): Grow heap (frag case) to 15.540MB for 1705616-byte allocation
11-29 17:13:18.268: D/dalvikvm(18123): GC_CONCURRENT freed <1K, 8% free 14978K/16135K, paused 19ms+1ms, total 28ms
11-29 17:13:18.608: D/libEGL(18123): loaded /system/lib/egl/libEGL_mali.so
11-29 17:13:18.638: D/libEGL(18123): loaded /system/lib/egl/libGLESv1_CM_mali.so
11-29 17:13:18.643: D/libEGL(18123): loaded /system/lib/egl/libGLESv2_mali.so
11-29 17:13:18.663: D/(18123): Device driver API match
11-29 17:13:18.663: D/(18123): Device driver API version: 10
11-29 17:13:18.663: D/(18123): User space API version: 10 
11-29 17:13:18.663: D/(18123): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Tue Oct 16 15:37:13 KST 2012 
11-29 17:13:18.698: D/OpenGLRenderer(18123): Enabling debug mode 0
11-29 17:13:18.953: D/KenBurnsView(18123): swapImage active=-1
11-29 17:13:19.003: D/KenBurnsView(18123): starting Ken Burns animation android.view.ViewPropertyAnimator@42d5e370
11-29 17:13:19.503: D/dalvikvm(18123): GC_CONCURRENT freed 580K, 10% free 15325K/16903K, paused 88ms+1ms, total 115ms
11-29 17:13:22.583: W/IInputConnectionWrapper(18123): getSelectedText on inactive InputConnection
11-29 17:13:22.588: W/IInputConnectionWrapper(18123): setComposingText on inactive InputConnection
11-29 17:13:22.623: W/IInputConnectionWrapper(18123): getExtractedText on inactive InputConnection
11-29 17:13:28.203: D/KenBurnsView(18123): swapImage active=1
11-29 17:13:28.203: D/KenBurnsView(18123): new active=0
11-29 17:13:28.208: D/KenBurnsView(18123): starting Ken Burns animation android.view.ViewPropertyAnimator@42e55930
11-29 17:13:37.433: D/KenBurnsView(18123): swapImage active=0
11-29 17:13:37.433: D/KenBurnsView(18123): new active=1
11-29 17:13:37.788: D/KenBurnsView(18123): starting Ken Burns animation android.view.ViewPropertyAnimator@42d5e370

Answer 1

您无需使用Elements即可完成此任务。 简单地使用doc.body().ownText() （一个String）来从页面中获取干净的，无HTML的文本要简单得多，尤其是因为您仅从文本文件中加载。

替换elem = document.select("*"); 与strText = document.body().ownText() 。 当然，您必须定义一个新的字符串。

最后，替换以下内容：

for (Element element : elem){
    String valueofelement = element.text();
    story.add(valueofelement);
    progressDialog.dismiss();
}

有了这个：

story.add(strText);
progressDialog.dismiss();

您的代码现在应该可以正常工作了。