Android SDK AsyncTask doInBackground not running (subclass)

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You should checkout this answer: https://stackoverflow.com/a/10406894/347565 and the link to google groups it includes.

I had a similar problem as you, still unclear why it is not working, but I changed my code like this and problem is gone:

ASyncTask<Void,Void,Void> my_task = new ASyncTask<Void,Void,Void>() { ... };
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
    my_task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[])null);
else
    my_task.execute((Void[])null);

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