FloatingNavigationView.java 文件源码

private void startOpenAnimations() {

        // Icon
        AnimatedVectorDrawable menuIcon = (AnimatedVectorDrawable) ContextCompat.getDrawable(getContext(),
                R.drawable.ic_menu_animated);
        mFabView.setImageDrawable(menuIcon);
        menuIcon.start();

        // Reveal
        int centerX = mFabRect.centerX();
        int centerY = mFabRect.centerY();
        float startRadius = getMinRadius();
        float endRadius = getMaxRadius();
        Animator reveal = ViewAnimationUtils
                .createCircularReveal(mNavigationView,
                        centerX, centerY, startRadius, endRadius);

        // Fade in
        mNavigationMenuView.setAlpha(0);
        Animator fade = ObjectAnimator.ofFloat(mNavigationMenuView, View.ALPHA, 0, 1);

        // Animations
        AnimatorSet set = new AnimatorSet();
        set.playSequentially(reveal, fade);
        set.start();
    }