ProgressDialog onCreate

问题

In "onCreate" I'm downloading data from web.The duration of downloading data is 10 sec. I wan't to have ProgressDialog while the data is downloading. Here is my code , but the ProgressDialog doesn't appear:

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    ProgressDialog dialog = ProgressDialog.show(Test.this, "", 
        "Loading. Please wait...", true);

     try {
         URL myURL = new URL("http://www.sample.com/");
         URLConnection ucon = myURL.openConnection();
         InputStream is = ucon.getInputStream();
         BufferedInputStream bis = new BufferedInputStream(is);
         ByteArrayBuffer baf = new ByteArrayBuffer(50);
         int current = 0;
          while((current = bis.read()) != -1){
                  baf.append((byte)current);
          }

          content= new String(baf.toByteArray());

     }
     catch (Exception e) {}
     dialog.dismiss();
}

回答1:

The best approach to do this kind of things is using AsyncTask in order to not freeze the application while you are downloading the file. Moreover, what if you give your users a better experience by using a progress bar dialog rather than a simple dialog. It's not difficult to implement; you can see an example here: Download a file with Android, and showing the progress in a ProgressDialog

来源：https://stackoverflow.com/questions/3122465/progressdialog-oncreate