android - 如何在 AsyncTask 的 DialogFragment 中显示 ProgressDialog

Question

我的 ProgressDialog 没有显示 - 它是在 AsyncTask 类 BackgroundDataLoad 中定义的。

DialoguePopup 类 -

public class DialoguePopup extends DialogFragment {

public DialoguePopup newInstace() 
{
    DialoguePopup dialogFragment = new DialoguePopup();
    return dialogFragment;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) 
{
    super.onCreateView(inflater, container, savedInstanceState);

    //view related code..

    //Calculation logic data load in background
    new BackgroundDataLoad().execute();
    return view;
}

class BackgroundDataLoad extends AsyncTask<String, String, String>
{
    @Override
    protected void onPreExecute() {
    super.onPreExecute();
    pDialog = new ProgressDialog(getActivity());
    pDialog.setMessage("Calculating ...");
    pDialog.setIndeterminate(false);
    pDialog.setCancelable(false);
    pDialog.show();
}

@Override
protected String doInBackground(String... params) 
{
   //Data that can take 8 seconds to load is in background process
   return null;
}

@Override
protected void onPostExecute(String result) 
{
   super.onPostExecute(result);
   pDialog.dismiss();
}

注意:

经过更多调试后，我发现我的 ProgressDialog 显示在 DialogFragment 下方，但我希望它显示在 DialogFragment 之上。

SO 帖子 How can I open a ProgressDialog on top of a DialogFragment?提及，

Apparently thats a widely complained about subject with ProgressDialog, I suggest you try a normal dialog, created with the builder and whose layout (a custom one made by you) includes the progress bar or loading or whatever you need. This should solve your problem.

但我想知道您的应用程序是否在不同的 View 中始终使用 ProgressDialog 那么它是使用自定义生成器执行此操作的最佳方式吗？

它阻碍了应用程序的一致性。而且，那是另一种方式。

Answer 1

@我的天

你只差两步。

1. onCreateDialog() as

   @Override
   public Dialog onCreateDialog(Bundle savedInstanceState) {
       Dialog dialog = super.onCreateDialog(savedInstanceState);
       dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
       return dialog;
   }
   

2. onStart() 作为

   @Override
   public void onStart() {
       super.onStart();
       new BackgroundDataLoad().execute();
   }
   

现在您的加载任务将在对话框创建后执行，因此现在您可以查看正在显示的进度对话框。