I am a .NET developer and i need to develop an small sample app in android which should have a screen with a button say click ,and the button should change its color when user clicks on it. I have never done java development or android . I need this app to demonstrate to a small group as to how mobile applications can work on a device. Can anybody please guide me in this thing. Also, I am planning to look into the source code and start my android development from there.