android: onPostExecute of Asynchtask after Activity finished

Question

AsynchTask got onPostExecute() method tied to UI thread. Assume that we close an activity by pressing back button while AsynchTask doInBackground() method is still in progress.

I want to know will onPostExecute executes by considering that activity is not displaying on screen anymore?
In case answer is yest, will it cause exceptions or not? (because of accessing UI objects which are not longer displayed on screen).

possible duplicate of [AsyncTask won't stop even when the activity has destroyed](http://stackoverflow.com/questions/2531336/asynctask-wont-stop-even-when-the-activity-has-destroyed) — flx, Sep 22 '13 at 09:19

score 2 · Accepted Answer · edited May 23 '17 at 12:32

2

1-I want to know will onPostExecute executes by considering that activity is not displaying on screen anymore?

yes!

2-In case answer is yest, will it cause exceptions or not? (because of accessing UI objects which are not longer displayed on screen).

Yes! it may cause Exception because your Instance of your Activity and Views which you use in your AsyncTask are not exist anymore

This Link will help you more : AsyncTask won't stop even when the activity has destroyed

edited May 23 '17 at 12:32

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answered Sep 22 '13 at 09:16

Arash GM

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But what to do when activity is null any solution? – PankajAndroid Oct 27 '15 at 11:06
@PankajAndroid : you can cencel the asynctask when activity is destroying or you can check null activity context on onPostExecute. – Arash GM Oct 27 '15 at 11:30

android: onPostExecute of Asynchtask after Activity finished

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