I hate inner class.
I've a main activity who launches a 'short-life' AsyncTask.
AsyncTask is in a separate file, is not an inner class of main activity
I need async task updates a textView from main Activity.
I know i can update a TextView from onProgressUpdate, if AsyncTask is a inner class
But how from an external, indipendent, async task ?
UPDATE: This looks like working :
In acitivty i call the task
backgroundTask = new BackgroundTask(this);
backgroundTask.execute();
In the constructor i've
public BackgroundTask(Activity myContext)
{
debug = (TextView) myContext.findViewById(R.id.debugText);
}
where debug was a private field of AsyncTask.
So onProgressUpdate I can
debug.append(text);
Thanks for all of you suggestions
Best Answer
AsyncTask is always separate class from
Activity
, but I suspect you mean it is in different file than your activity class file, so you cannot benefit from being activity's inner class. Simply pass Activity context as argument to your Async Task (i.e. to its constructor)and use when you need it (remember to NOT use in during
doInBackground()
) i.e. so when you would normally callin AsyncTask you call i.e.
Note that our
Activity
can be gone whiledoInBackground()
is in progress (so the reference returned can becomenull
), but by usingWeakReference
we do not prevent GC from collecting it (and leaking memory) and as Activity is gone, it's usually pointless to even try to update it state (still, depending on your logic you may want to do something like changing internal state or update DB, but touching UI must be skipped).