RippleView

public interface RippleView {
    RippleDrawable getRippleDrawable();

    void setRippleDrawable(RippleDrawable rippleDrawable);
}

Implementation

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        if (!changed)
            return;

        if (getWidth() == 0 || getHeight() == 0)
            return;

        if (rippleDrawable != null)
            rippleDrawable.setBounds(0, 0, getWidth(), getHeight());
    }

    @Override
    public void draw(Canvas canvas) {
            super.draw(canvas);
            if (rippleDrawable != null && rippleDrawable.getStyle() == RippleDrawable.Style.Over)
                rippleDrawable.draw(canvas);
    }


    // -------------------------------
    // ripple
    // -------------------------------

    private RippleDrawable rippleDrawable;
    private EmptyDrawable emptyBackground = new EmptyDrawable();

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        if (rippleDrawable != null && event.getAction() == MotionEvent.ACTION_DOWN)
            rippleDrawable.setHotspot(event.getX(), event.getY());
        return super.dispatchTouchEvent(event);
    }

    @Override
    public RippleDrawable getRippleDrawable() {
        return rippleDrawable;
    }

    public void setRippleDrawable(RippleDrawable newRipple) {
        if (rippleDrawable != null) {
            rippleDrawable.setCallback(null);
            if (rippleDrawable.getStyle() == RippleDrawable.Style.Background)
                super.setBackgroundDrawable(rippleDrawable.getBackground() == null ? emptyBackground : rippleDrawable.getBackground());
        }

        if (newRipple != null) {
            newRipple.setCallback(this);
            if (newRipple.getStyle() == RippleDrawable.Style.Background) {
                super.setBackgroundDrawable((Drawable) newRipple);
            }
        }

        rippleDrawable = newRipple;
    }

    @Override
    protected boolean verifyDrawable(Drawable who) {
        return super.verifyDrawable(who) || rippleDrawable == who;
    }

    @Override
    public void invalidateDrawable(Drawable drawable) {
        super.invalidateDrawable(drawable);
        if (rippleDrawable != null && getParent() != null && rippleDrawable.getStyle() == RippleDrawable.Style.Borderless)
            ((View) getParent()).postInvalidate();
    }

    @Override
    public void setBackground(Drawable background) {
        setBackgroundDrawable(background);
    }

    @Override
    public void setBackgroundDrawable(Drawable background) {
        if (background instanceof RippleDrawable) {
            setRippleDrawable((RippleDrawable) background);
            return;
        }

        if (rippleDrawable != null && rippleDrawable.getStyle() == RippleDrawable.Style.Background) {
            rippleDrawable.setCallback(null);
            rippleDrawable = null;
        }
        super.setBackgroundDrawable(background == null ? emptyBackground : background);
    }