卫星菜单

使用ObjectAnimator实现卫星菜单

打开菜单：

private boolean isOpen=false;
private List<Animator> listAnimClose=new ArrayList<>();//关闭动画集合
private List<Animator> listAnimOpen=new ArrayList<>();//打开动画集合
double radian=2*Math.PI/360;
double angle=22.5;

private void openMenu(){
    isOpen=true;
    AnimatorSet animset=new AnimatorSet();
    for (int i = 1; i <imageViews.length ; i++) {
        AnimatorSet animsetItem=new AnimatorSet();
        ObjectAnimator objectAnimX=ObjectAnimator.ofFloat(imageViews[i],"translationX",0f,(float) (400*Math.cos(radian*angle*(i-1))));
        ObjectAnimator objectAnimY=ObjectAnimator.ofFloat(imageViews[i],"translationY",0f,(float) (400*Math.sin(radian*angle*(i-1))));
        ObjectAnimator objectAnimR=ObjectAnimator.ofFloat(imageViews[i],"rotation",0f,360f);
        animsetItem.setDuration(800);
        animsetItem.setInterpolator(new BounceInterpolator());
        animsetItem.playTogether(objectAnimX,objectAnimY,objectAnimR);
        listAnimOpen.add(animsetItem);
    }
    animset.playTogether(listAnimOpen);
    animset.setDuration(800);
    animset.start();
}

    关闭菜单：

private void closeMenu() {
    isOpen=false;
    AnimatorSet animset=new AnimatorSet();
    for (int i = 1; i <imageViews.length ; i++) {
        AnimatorSet animsetItem=new AnimatorSet();
        //Math.cos()，参数为角度的弧度制；如：（2*3.14）/360*(当前角度)
        ObjectAnimator objectAnimX=ObjectAnimator.ofFloat(imageViews[i],"translationX",(float) (400*Math.cos(radian*angle*(i-1))),0f);
        ObjectAnimator objectAnimY=ObjectAnimator.ofFloat(imageViews[i],"translationY",(float) (400*Math.sin(radian*angle*(i-1))),0f);
        ObjectAnimator objectAnimR=ObjectAnimator.ofFloat(imageViews[i],"rotation",0f,360f);
        animsetItem.setDuration(400);
        animsetItem.setInterpolator(new AccelerateInterpolator());
        animsetItem.playTogether(objectAnimX,objectAnimY,objectAnimR);
        listAnimClose.add(animsetItem);
    }
    animset.playTogether(listAnimClose);
    animset.setDuration(400);
    animset.start();
}