Android DialogFragment

Question

I use a class which extends DialogFragment, and in this class I use an AsyncTask for loading the content of my AlertDialog .
My question is: how I can create an AlertDialog which shows: "Loading..." and then shows the content in my onPostExecute method?

public class MyDialog extends DialogFragment {

    public MyDialog(){
       super();
    }

    @Override
    public Dialog onCreateDialog(final Bundle savedInstanceState) {
       AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

       ....

       return builder.create();
    }

    public class myTask extends Asynctask<Void, Void, Void> {

       @Override
       protected Void onPreExecute(){
           Show loading... in AlertDialog
       }

       @Override
       protected Void doInBackground(Void... voids) {
           Load content...
       }

       @Override
       protected Void onPostExecute(){
           Show content in AlertDialog
       }
   }

Answer 1

For that purpose, my suggestion is that don't use AlertDialog. Use a progress dialog, Here is your complete dialog,

public class MyDialog extends DialogFragment {

    public MyDialog(){
       super();
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.your_dialog_id, container, false);
        new myTask().execute();
        return view;    
    }

    private void afterContentLoad (Object content)
    {
        //Update your UI with respect of your content :)
    }

    public class myTask extends Asynctask<Void, Void, Void> {
       private ProgressDialog mDialog;
       @Override
       protected Void onPreExecute(){
           try{
              mDialog = ProgressDialog.show(getActivity(), "", "Loading...!");
           }
           catch(Exception e)
           {
               //BadTokenException
               e.printStackTrace();
           }
       }

       @Override
       protected Void doInBackground(Void... voids) {
           Load content...
       }

       @Override
       protected Void onPostExecute(){
           if (mDialog != null && mDialog.isShowing()){
               mDialog.dismiss();
           }
           //Put your code after content loaded
           afterContentLoad(Object);
       }
   }

}