App GUI validation - is it possible?

Hi all,

I'm new to android, and I'm helping a friend to test his app.
We want to make some automatic tests, and for that we need to be able to validate what the app show on the screen.

Our best solution we thought about was to find a way to read the text from the screen.
Unfortunately, we didn't find any clue about that around the web

Test for example:
1. change setting to be enabled.
expected result:
1. The app will do stuff.
2. The word "enabled" will be appear on the screen instead of "disabled".

Any comment will be appreciated.
Thanks!