onPostExecute on cancelled AsyncTask

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The documented behaviour of onPostExecute on cancel() was changed between Android 2 and Android 4.

Android 2.3.7 onPostExecute :

Runs on the UI thread after doInBackground. The specified result is
the value returned by doInBackground or null if the task was cancelled
or an exception occured.

Android 4.0.1 onPostExecute :

Runs on the UI thread after doInBackground. The specified result is
the value returned by doInBackground. This method won’t be invoked if
the task was cancelled.

So if you are still targeting Android 2 devices you should assume that onPostExecute will be called and in onPostExecute check for null result.

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