如何更改按钮状态直到另一个按钮被按下?

I have a button that has a drawable XML file set as the background, this is so that when the button is pressed the background colour and outline of the button is change. However it does not stay like this, after a second it goes back to what it is before. How do I get it to stay with the changed colours until a different button is pressed?I have a button that has a drawable XML file se