Updating progress dialog in Activity from AsyncTask
Solution 1
AsyncTask has method onProgressUpdate(Integer...)
that you can call each iteration for example or each time a progress is done during doInBackground()
by calling publishProgress()
.
Refer to the docs for more details
Solution 2
you can update from AsyncTask's method onProgressUpdate(YOUR_PROGRESS)
that can be invoked from doInBackground
method by calling publishProgress(YOUR_PROGRESS)
the data type of YOUR_PROGRESS can be defined from AsyncTask<Int, YOUR_PROGRESS_DATA_TYPE, Long>
Laimoncijus
Updated on July 09, 2022Comments
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Laimoncijus almost 2 years
In my app I am doing some intense work in
AsyncTask
as suggested by Android tutorials and showing aProgressDialog
in my main my activity:dialog = ProgressDialog.show(MyActivity.this, "title", "text"); new MyTask().execute(request);
where then later in
MyTask
I post results back to activity:class MyTask extends AsyncTask<Request, Void, Result> { @Override protected Result doInBackground(Request... params) { // do some intense work here and return result } @Override protected void onPostExecute(Result res) { postResult(res); } }
and on result posting, in main activity I hide the dialog:
protected void postResult( Result res ) { dialog.dismiss(); // do something more here with result... }
So everything is working fine here, but I would like to somehow to update the progress dialog to able to show the user some real progress instead just of dummy "Please wait..." message. Can I somehow access the progress dialog from
MyTask.doInBackground
, where all work is done?As I understand it is running as separate Thread, so I cannot "talk" to main activity from there and that is why I use
onPostExecute
to push the result back to it. But the problem is thatonPostExecute
is called only when all work is already done and I would like to update progress the dialog in the middle of doing something.Any tips how to do this?