How to make a simple button interaction as a picture on android?

Question

Java

Hello, how can I implement some kind of action on pressing a button, and how can I do it as easily as possible (what would be as little code as possible)?

Answer 1

findViewById(R.id.btn).setOnClickListener(new OnClickListener(){
        @Override
        public void onClick(View v){
             // TODO
        }
    });