How to see Android application developed on which Version No and API level?When is recived .apk file(no source) for testing?

I have recived .apk file for testing application using Robotium.   

Here How to see Android application developed on which Version(ex 2.2) and how see API level(ex 8,9,10)?

Here how i started and stuck at 3tr point:-

1Create the Test project by "File --> New --> Project --> Android --> Android Test Project", the window will open

2Enter the Project Name, click on 'Next'

3in the "Build Target", select the application development platform, Vesion and API