**SOLVED By looking at some notes i sent to my self years ago** Well this is embarrasing. I did android development throughout high school and got pretty decent at it. But as when I graduated I pretty much stopped coding. Now im getting back into it a few years later. Im stuck at the most basic thing I feel as if I could get stuck at. Im just toying around right now, getting my feet wet. Let's say I have a button and a plain text field. From my MainActivity, how do I refernce 'cmdGo'(button) to alter the contents of of 'textbox' to say lets say "Hola Bro". Obviously I need to set the onClick property for the button in the XML editor, but thats where I get stuck. Any tips?