Android simple app

I need a simple project, i can not pay more than $20, if, it is to low for you, simply ignore this post. What i need is 1 activity any layout combination with 4 columns by 4 rows of buttons (buttons must be addet to layout by Code) and when you slide your finger over them they must change their test (not all of them, just the one you are touching), for example from Text1 to Text2. That's all. let me know if you need more info