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

Don't use a button and override your Activity's dispatchTouchEvent and handle it that way.

Answer 2

Simple answer is set alpha to 0 like this.

 <Button
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:alpha="0"
                android:clickable="true"
                android:onClick="getAllImages"
                android:visibility="visible" />

It will be invisible and onclick will work.

Answer 3

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 ;))

Answer 4

Make sure that your button's width and height are not set to wrap_content because that would cause the button to be extremely small if the text is " ". If that doesn't work, you could also try replacing onClick() with onTouch():

button1.setOnTouchListener(new OnTouchListener()
{
    @Override
    public boolean onTouch(View v, MotionEvent event)
    {
        // TODO Auto-generated method stub
        return false;
    }
});