For the interface I followed the the implicit OAuth 2.0 flow. Thank you Malcolm for being the sponsor of this tutorial!
The test app can list App Inventor questions on Stackoverflow and can provide some user info of the current user.
Note: This app is for demo purposes only and does not have any official Stack Exchange relationship.
I used the following scopes in the demo app:
Tested successfully on Nexus 5 running Android 4.4.4.
You can test with the apk file, which is available for download here:
Download apk file
You can buy the source code of this project.
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I usually will send the download link not later than 24 hours after having received your payment.
Thank you! Taifun