Android Alpha Animation: Alpha value jumps back to old value after Animation ended

I have a ImageButton View on a Layout. If the users clicks the ImageButton the button should fade out. The buttons fadeout animation will be started like this: ``` public void buttonClicked(View aButton){ final Animation aAnim = new AlphaAnimation(1.0f, 0.0f); aAnim.setDuration(500); aButton.startAnimation(aAnim); } ``` This works, but as soon as the ImageButton is faded out, its Alpha Value jumps right back to 1.0 and the button is visible again. I solved it temporarily with a Animation Listener that sets the ButtonImage to invisible at the end of the Animation but that seems to be a odd solution to me. What do I have to do to keep the buttons Alpha Value at its last value of the Animation? Thank You.