how to play sound in Rollette game to each section cross android

Question

I am making a Rollette game and I want to play sound in each crossing section like if 1 is crossing it should find some trigger or collision detection and ping one tick sound. My problem is that I am not able to find the collision detection on image. Below is the approaches that I have done.

1. I have taken LayoutView and placed a Rollette wheel image inside it.
2. In each section (0-9) has taken a green small button which will be used to detect the collision with the arrow. Once it collides there will be a Tick sound with up-down animation in arrow. (Image attached).

Problem.

1. I am not able to find the new co-ordinate of views in each rotation. It is returning the same static location every time and hence collision is never happening.

Rotation Code..

    final RotateAnimation rotate = new RotateAnimation(0, 360f,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
    rotate.setDuration(10000);
    rotate.setFillAfter(true);

Collision detection code...

    Rect arrowBtnRect = new Rect();
    arrowBtn.getGlobalVisibleRect(arrowBtnRect);


    Rect btn0Rect = new Rect();
    btn0.getGlobalVisibleRect(btn0Rect);

   if(arrowBtnRect.intersect(btn0Rect)) {
       System.out.println("Collision detected "+numberSelected);
       numberSelected = "0";
       return true;
   }

Answer 1

Your idea is brilliant!

But I have certain remarks on your approach:

• setFillAfter() is not helping, according to documentations:

If fillAfter is true, the transformation that this animation performed will persist when it is finished.

• I recommend using ObjectAnimator instead of RotateAnimation. While RotateAnimation is just making the view looks as if it is rotating until you call fillAfter (which happens after animation stops), ObjectAnimator makes the view really change its actual angle while rotating. See this: https://stackoverflow.com/a/29465710/10005752

Usage:

    Random random = new Random(); 
    float randomAngle = (float) (random.nextInt(360) + 1); 
    ObjectAnimator rouletteAnimator = ObjectAnimator.ofFloat(rouletteView, View.ROTATION, 0f, randomAngle);
    rouletteAnimator.setDuration(10000);
    rouletteAnimator.start();

---

Also, to elaborate more on my comment I recommend that get all angles that have buttons on them before starting animating, and when animation starts keep using rouletteView.getRotation(); to check what angle is at the top.

Example:

Button1 is at angle 90 and rouletteView is rotating Counter Clockwise. Then if rouletteView.getRotation() == 360 - 90 is true then Button1 is touching the arrow.

I hope I'm clear!