Question

我第一次使用AsyncTask类作为主活动类中的内部类。这是代码：

    // Async Task Class
    class fetchdata extends AsyncTask<String, String, String> {

        // Show Progress bar before downloading file
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Shows Progress Bar Dialog and then call doInBackground method
            showDialog(progress_bar_type);
        }

        // Download File from Internet
        @Override
        protected String doInBackground(String... f_url) {
            int count;
            try {
                URL url = new URL(f_url[0]);
                URLConnection conection = url.openConnection();
                conection.connect();
                // Get Music file length
                int lenghtOfFile = conection.getContentLength();
                // input stream to read file - with 8k buffer
                InputStream input = new BufferedInputStream(url.openStream(),10*1024);
                // Output stream to write file in SD card
                OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory().getPath()+"/jai_ho.mp3");
                byte data[] = new byte[1024];
                long total = 0;
                while ((count = input.read(data)) != -1) {
                    total += count;
                    // Publish the progress which triggers onProgressUpdate method
                    publishProgress("" + (int) ((total * 100) / lenghtOfFile));

                    // Write data to file
                    output.write(data, 0, count);
                }
                // Flush output
                output.flush();
                // Close streams
                output.close();
                input.close();
            } catch (Exception e) {
                Log.e("Error: ", e.getMessage());
            }
            return null;
        }

        // While Downloading File
        protected void onProgressUpdate(String... progress) {
            // Set progress percentage
            prgDialog.setProgress(Integer.parseInt(progress[0]));
        }

        // Once File is downloaded
        @Override
        protected void onPostExecute(String file_url) {
            // Dismiss the dialog after the file was downloaded
            dismissDialog(progress_bar_type);
            Toast.makeText(getApplicationContext(), "Download complete", Toast.LENGTH_LONG).show();
            // Play the music
        }
    }

Eclipse告诉我不推荐使用showDialog和dismissDialog方法。如何使用FragmentManager使用DialogFragment类更改我的代码？

Answer 1

根据需要进行更改（例如参数，返回类型）：

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

@Override
protected void onPreExecute() {
    super.onPreExecute();
    // Showing progress dialog
    progressDialog = new ProgressDialog(activityName.this);//getApplicationContext()
    progressDialog.setMessage("Please wait...");
    progressDialog.setCancelable(false);
    progressDialog.show();

}

@Override
protected Void doInBackground(Void... arg0) {   
    // Making a request to url and getting response

    return null;
}

@Override
protected void onPostExecute(Void result) {
    super.onPostExecute(result);
    // Dismiss the progress dialog
    if (progressDialog.isShowing())
        progressDialog.dismiss();
    /**
     * To do code
     * */

    }
}

在主课程开始后添加以下行：

private ProgressDialog processDialog;

如何转换使用弃用方法的代码？

1 个答案: