Can I get some help running an Android app on emulator?

[AC Question]

Problem running android app on emulator

Hi everyone,
My question is:
What can be the problem if i get an empty app while running it in an emulator.
I coded an app in eclipse,and i am running it on bluestacks.When i enter the app,it gives a blank screen.
My app is a simple login form,which connects to a database for that.
What might be the problem when i receive the blank page?
And thank you all.