setting android button invisible but still having an onClick Listener attached

Question

So currently I\'m putting an Easter egg inside my app and I want the Button to be invisible, but when clicked(Rick roll). So far I can make it work when I say:

Answer 1

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
     Button b = (Button) findViewById(R.id.button1);
     final CheckBox cb = (CheckBox) findViewById(R.id.checkBox1);
     b.setBackgroundColor(Color.TRANSPARENT);

     b.setOnClickListener(new OnClickListener() {

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            cb.setChecked(true);

to this code button is invisible but it worked ;))