Question

How the ProgressValue (passing in the onPostExecute() in AsyncTask ) represents. it’s value depends on what ?

Answer 1

When you create your AsyncTask class, you may specify types of the parameters, progress and result:

private class MyTask extends AsyncTask<ParamType, ProgressType, ResultType> { ... }

If you want to use progress values to update the progress bar, I’d recommend to use Integer, so your class declaration will look like this:

private class MyTask extends AsyncTask<ParamType, Integer, ResultType> { ... }

the following call should be made somewhere from doInBackground():

publishProgress(progress_value);  // progress_valus is integer

and your onProgressUpdate() member will look like this:

protected void onProgressUpdate(Integer... values)  {
    super.onProgressUpdate(values);
    dialog.setProgress(values[0]);  // dialog is the ProgressDialog
}