Android - How to implement a Login-Dialog for a background thread?

Question

Im working with Android 2.1, RoboGuice 1.1 and Guice 2.0 (without aop).
My app has a background thread that gets started in the onCreate method of the Activity which connects to a server and might need the user to provide credentials for logging in.

At first I found the PopupWindow in the API but I read in this post that it shouldn't be used for that.

So I tried to inject my Activity into my background thread and to open a Dialog in a Runnable passed to Activity.runOnUIThread(Runnable r) but unfortunately roboguice is creating a new instance of my activity when injecting it into my background thread.

I now assume the correct way of implementing a Login-Dialog would be to send an Intent to my activity and let it show the Dialog. Furthermore I assume that the Activity needs to send an Intent (containing the credentials) back to the background thread.
Is this correct or is there a more elegant way of doing that?

In this post I found how to register a receiver for the Intent. But on which Activity instance should I call registerReceiver within the background thread?

Best regards

What do you mean by "tried to inject myActivity into my background thread"? Is that roboguice terminology? — Vikram Bodicherla, Jan 24 '12 at 12:13
My background thread is created by RoboGuice as it's a simple POJO. Within this class there is a field `@Inject private MyActivity mainActivity;` that also gets set by RoboGuice. — Marc-Christian Schulze, Jan 24 '12 at 12:13
If `runOnUiThread` is not an option, then I think what you need is not an Intent but a Handler. — Mister Smith, Jan 24 '12 at 12:43
And I can't understand how that robo-thing is preventing you from holding references. It has to be a way to pass a reference to your thread! — Mister Smith, Jan 24 '12 at 12:49
Ok. I think I found a solution. I can obtain a reference to my Application instance and register a BroadcastReceiver on it. — Marc-Christian Schulze, Jan 24 '12 at 13:25

Manfred Moser · Accepted Answer · 2012-04-24T22:28:04.307

0

I would suggest to create an inner class in the activity that uses RoboAsyncTask and basically has access to the activity. That works well for me. If you need to be able to login from different activities you make it a top level class and pass the fragment or activity instance into the async task constructor and do the ui updates in onSuccess.

edited Apr 24 '12 at 22:28

answered Jan 27 '12 at 18:54

Manfred Moser

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Android - How to implement a Login-Dialog for a background thread?

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