Android动画实例

灵动菜单

实现思路

把菜单项目放在菜单按钮同一位置, 当点击带单按钮时候, 每个菜单项开始动画, 从原来位置,移动到指定位置

代码

布局文件:

展开菜单:

private void startMenu(){
        ObjectAnimator mainAnimator = ObjectAnimator.ofFloat(ivMain,"alpha",1f,0.5f);

        float leftCurrentX = ivLeft.getTranslationX();
        ObjectAnimator leftAnimator = ObjectAnimator.ofFloat(ivLeft,"translationX",leftCurrentX,-200f);

        float rightCurrentX = ivRight.getTranslationX();
        ObjectAnimator rightAnimator = ObjectAnimator.ofFloat(ivRight,"translationX",rightCurrentX,200f);

        float topCurrentY = ivTop.getTranslationY();
        ObjectAnimator topAnimator = ObjectAnimator.ofFloat(ivTop,"translationY",topCurrentY,-200f);

        float bottomCurrentY = ivBottom.getTranslationY();
        ObjectAnimator bottomAnimator = ObjectAnimator.ofFloat(ivBottom,"translationY",bottomCurrentY,200f);


        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.playTogether(mainAnimator,leftAnimator,rightAnimator,topAnimator,bottomAnimator);
        animatorSet.setDuration(500);
        animatorSet.setInterpolator(new BounceInterpolator());
        animatorSet.start();

        flag = false;
}

关闭菜单:

private void closeMenu(){
        ObjectAnimator mainAnimator = ObjectAnimator.ofFloat(ivMain,"alpha",0.5f,1f);

        float leftCurrentX = ivLeft.getTranslationX();
        ObjectAnimator leftAnimator = ObjectAnimator.ofFloat(ivLeft,"translationX",leftCurrentX, 0f);

        float rightCurrentX = ivRight.getTranslationX();
        ObjectAnimator rightAnimator = ObjectAnimator.ofFloat(ivRight,"translationX",rightCurrentX,0f);

        float topCurrentY = ivTop.getTranslationY();
        ObjectAnimator topAnimator = ObjectAnimator.ofFloat(ivTop,"translationY",topCurrentY,0f);

        float bottomCurrentY = ivBottom.getTranslationY();
        ObjectAnimator bottomAnimator = ObjectAnimator.ofFloat(ivBottom,"translationY",bottomCurrentY,0f);


        AnimatorSet animatorSet = new AnimatorSet();
        animatorSet.playTogether(mainAnimator,leftAnimator,rightAnimator,topAnimator,bottomAnimator);
        animatorSet.setDuration(500);
        animatorSet.setInterpolator(new BounceInterpolator());
        animatorSet.start();

        flag = true;
}

对主菜单按钮监听

ivMain.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (flag) startMenu();
        else closeMenu();
    }
});

下拉展开动画

实现思路

两个LinearLayout, 一个visibility为显示,另一个为gone. 当点击showVIew时,把隐藏的LinearLayout设置为visibility,对这个过程使用动画.

代码

布局文件:

获取ValueAnimator:

private ValueAnimator createValueAnimator(final View view, int start, int end){
        final ValueAnimator animator = ValueAnimator.ofInt(start,end);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                int value = (int)valueAnimator.getAnimatedValue();
                ViewGroup.LayoutParams params = view.getLayoutParams();
                params.height = value;
                view.setLayoutParams(params);
            }
        });
        return animator;
}

展开动画:

private void openAnimation(View view){
        view.setVisibility(View.VISIBLE);
        ValueAnimator valueAnimator = createValueAnimator(view,0,measureHiddenViewHeight);
        valueAnimator.start();
}

关闭动画:

private void closeAnimation(final View view) {
    int origHeight = view.getHeight();
    ValueAnimator valueAnimator = createValueAnimator(view,origHeight,0);
    valueAnimator.addListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            view.setVisibility(View.GONE);
        }
    });
    valueAnimator.start();
}