title: Sliding finger across screen activating buttons as if they were pressed
body: <p>In case my title wasn't clear enough, I'll explain it in detail:</p>
  
  <p>Say we have a screen filled with multiple buttons (10+), and we press down on one, activating onTouch/onClick. If we now move the finger, without lifting it, I want it to activate any other button it slides over. In this particular case, I want sound to be played when you slide over a virtual piano.</p>
  
  <p>I know about the onTouchListener-solution where you register every ACTION_MOVE and find some boundaries that activates new events, but that's far from optimal if you have multiple buttons and want to allow smooth sliding without delay.</p>
  
  <p>I also read <a href="https://stackoverflow.com/questions/4838609/detect-which-view-your-finger-is-sliding-over-in-android">this thread</a> which suggested that we combine the touchListener of the View with a gesturelistener from the activity, but once again, this does not feel at all optimal for my situation.</p>
  
  <p>I have not tried combining touchlistener with gesturelistener yet, but I will go ahead and do so if someone tells me they have no other way of doing this.</p>