下载图片的进度对话框

Question

我正在下载大约 231 张图片，希望有一个进度对话框，显示正在下载图片，请等待所有图片可用，然后消失。我该怎么做呢？

protected class DownloadFile extends AsyncTask<String, Integer, String>{
    @Override
    protected String doInBackground(String... url)
    {
        int count;
        try 
        {
            URL url1 = new URL(url[0]);
            URLConnection conexion = url1.openConnection();
            conexion.connect();
            // this will be useful so that you can show a tipical 0-100% progress bar
            int lenghtOfFile = conexion.getContentLength();

            // download the file
            InputStream input = new BufferedInputStream(url1.openStream());
            byte data[] = new byte[1024];

            long total = 0;
            while ((count = input.read(data)) != -1) 
            {
                total += count;
                // publishing the progress....
                publishProgress((int)(total*100/lenghtOfFile));
            }
            input.close();
        } 
        catch (Exception e)
        {
        }
        return null;
    }
    public void onProgressUpdate(Integer... values)
    {
        super.onProgressUpdate(values);
        // here you will have to update the progressbar
        // with something like
        setProgress(numPokemon);
    }
}

Answer 1

我认为你没有错，
在 onpreExecute() 中显示进度对话框，在 doinBackground() 中显示逻辑并在 onPostExecute() 中关闭进度对话框。

希望你能明白

Answer 2

试试这个::

class AddTask extends AsyncTask<Void, Void, Void> {
         ProgressDialog pDialog = ProgressDialog.show(Recording.this,"Please wait...", "Retrieving data ...", true);
        protected void onPreExecute() {

            pDialog.setIndeterminate(true);
            pDialog.setCancelable(false);
            pDialog.show();
            SaxParser(Username,Password);

        }

        protected Void doInBackground(Void... unused) {
           // your code
            return(null);
        }
        protected void onPostExecute(Void unused) {
            pDialog.dismiss();
        }
      }