Android ListView的Item上浮动画_android item 上浮动画-优快云博客

本文链接：https://blog.youkuaiyun.com/wushuangshuangmj/article/details/52442022

本文介绍了一种在Android ListView中实现简单上浮动画的方法。通过TranslateAnimation和AlphaAnimation结合使用，实现了Item从底部平滑移入的效果。文章提供了具体代码示例，并解决了滚动时Item联动的问题。

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有时候在做列表显示时，需要给列表中的listView添加动画。在我做过的项目中大多数都是每个Item的上浮动画，动画比较简单，直接上代码。

AnimationSet animationSet = new AnimationSet(false);
        animationSet.setDuration(duration);
        if (listener != null) {
            animationSet.setAnimationListener(listener);
        }
        animationSet.setFillBefore(true);
        animationSet.setStartOffset(startOffset);
        Animation translateAnimation = new TranslateAnimation(
                Animation.RELATIVE_TO_SELF, 0,
                Animation.RELATIVE_TO_SELF, 0,
                Animation.ABSOLUTE, DrawUtils.dip2px(context, 100),
                Animation.RELATIVE_TO_SELF, 0);
        translateAnimation.setInterpolator(interpolator);
        animationSet.addAnimation(translateAnimation);
        Animation alphaAnimation = new AlphaAnimation(0, 1);
        animationSet.addAnimation(alphaAnimation);

很简单的补间动画，一个向上平移100pix的平移动画和从不显示到显示的的Alpha动画。

使用：要想让ListView中的每个Item都展示动画，那么我们需要在getView方法里，为convertView设置并启动Animation，即convertView.startAnimation(animation)。

 @Override
    public View getView(int position, View convertView, ViewGroup parent) {
   //////////动画／／／／／／／／／／／／／／／
        if (convertView != null) {
                AnimationSet animationSet = new AnimationSet(false);
                animationSet.setDuration(mAnimDuration);
                animationSet.setAnimationListener(this);
                animationSet.setFillBefore(true);
                animationSet.setStartOffset(mCurrentAnimationCount * mAnimDuration / 3);

                Animation translateAnimation = new TranslateAnimation(
                        Animation.RELATIVE_TO_SELF, 0,
                        Animation.RELATIVE_TO_SELF, 0,
                        Animation.ABSOLUTE, dip2px(mContext, 100),
                        Animation.RELATIVE_TO_SELF, 0);
                translateAnimation.setInterpolator(mInterpolator);
                animationSet.addAnimation(translateAnimation);

                Animation alphaAnimation = new AlphaAnimation(0, 1);
                animationSet.addAnimation(alphaAnimation);

                convertView.startAnimation(animationSet);
                ++mCurrentAnimationCount;
                HANDLER.post(mRunnable);
        }
///////////结束//////////////////////////////
       return convertView;
    }

这样同时也存在一个问题，就是getView滚动的时候会造成Item之间进行联动。因此，可以添加一个标志位来控制：

if (convertView != null
 && position > mPreviousPostition) {
 mPreviousPostition = position; ／／ 初始值为－1
                AnimationSet animationSet = new AnimationSet(false);
                animationSet.setDuration(mAnimDuration);
                animationSet.setAnimationListener(this);
                animationSet.setFillBefore(true);
                animationSet.setStartOffset(mCurrentAnimationCount * mAnimDuration / 3);

                Animation translateAnimation = new TranslateAnimation(
                        Animation.RELATIVE_TO_SELF, 0,
                        Animation.RELATIVE_TO_SELF, 0,
                        Animation.ABSOLUTE, dip2px(mContext, 100),
                        Animation.RELATIVE_TO_SELF, 0);
                translateAnimation.setInterpolator(mInterpolator);
                animationSet.addAnimation(translateAnimation);

                Animation alphaAnimation = new AlphaAnimation(0, 1);
                animationSet.addAnimation(alphaAnimation);

                convertView.startAnimation(animationSet);
                ++mCurrentAnimationCount;
                HANDLER.post(mRunnable);
        }
///////////结束//////////////////////////////
       return convertView;
    }