GridLayoutManager（RecyclerView）中的项目在滚动android上更改位置答案

【问题标题】：items in GridLayoutManager (RecyclerView) changes position on scroll androidGridLayoutManager（RecyclerView）中的项目在滚动android上更改位置
【发布时间】：2016-02-17 08:16:15
【问题描述】：

我有什么

我有一个GridLayoutManager (RecyclerView)，它的位置 0,2,5,7 用自定义图像固定（相对布局转换为位图），其余位置用服务器图像填充

我的问题

当我滚动布局中的项目时，它的位置会改变

我的代码

@Override
    public void onBindViewHolder(ProfilePhotosViewHolder ProfilePhotosViewHolder, final int position) {
        model = list.get(position);

        if (position == 0 || position == 2 || position == 5 || position == 7) {
            if (position == 0) {
                ProfilePhotosViewHolder.relativeBucket.setVisibility(View.VISIBLE);
                ProfilePhotosViewHolder.relativeBucket.setDrawingCacheEnabled(true);
                ProfilePhotosViewHolder.relativeBucket.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                        View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
                ProfilePhotosViewHolder.relativeBucket.layout(0, 0, ProfilePhotosViewHolder.relativeBucket.getMeasuredWidth(), ProfilePhotosViewHolder.relativeBucket.getMeasuredHeight());
                ProfilePhotosViewHolder.relativeBucket.buildDrawingCache(true);
                Bitmap b = Bitmap.createBitmap(ProfilePhotosViewHolder.relativeBucket.getDrawingCache());
                ProfilePhotosViewHolder.relativeBucket.setDrawingCacheEnabled(false);
                ProfilePhotosViewHolder.imgProfilePhotos.setImageBitmap(b);
            }

            if (position == 2) {
                ProfilePhotosViewHolder.relativeFollowers.setVisibility(View.VISIBLE);
                ......

            }

            if (position == 5) {
                ProfilePhotosViewHolder.relativeFollowing.setVisibility(View.VISIBLE);
               ......
            }

            if (position == 7) {
                ProfilePhotosViewHolder.relativePosts.setVisibility(View.VISIBLE);
                ......
            }

        } else {

            ProfilePhotosViewHolder.relativeBucket.setVisibility(View.GONE);
            ProfilePhotosViewHolder.relativeFollowers.setVisibility(View.GONE);
            ProfilePhotosViewHolder.relativeFollowing.setVisibility(View.GONE);
            ProfilePhotosViewHolder.relativePosts.setVisibility(View.GONE);

            ImageLoader imageLoader = AppController.getInstance().getImageLoader();
            ProfilePhotosViewHolder.imgProfilePhotos.setImageUrl(model.ImagesUri, imageLoader);
            ProfilePhotosViewHolder.imgProfilePhotos.setDefaultImageResId(R.drawable.im_profile_monuments);
            ProfilePhotosViewHolder.imgProfilePhotos.setErrorImageResId(R.drawable.im_profile_monuments);
        }

屏幕截图

滚动后

【问题讨论】：

标签： android scroll android-recyclerview gridlayoutmanager

【解决方案1】：

这是因为回收机制，当你在玩可见性时，你还需要在每个if 块中处理其他Views 的可见性。

例如位置 2：

if (position == 2) {

    ProfilePhotosViewHolder.relativeFollowers.setVisibility(View.VISIBLE);

    ProfilePhotosViewHolder.relativeBucket.setVisibility(View.GONE);
    ProfilePhotosViewHolder.relativeFollowing.setVisibility(View.GONE);
    ProfilePhotosViewHolder.relativePosts.setVisibility(View.GONE);
}

PS：我建议你使用switch(position) 而不是嵌套的if 块。

【讨论】：

在我的情况下切换有什么好处？
@karthikkolanji：请参阅：stackoverflow.com/questions/767821/…。这是关于它是如何在内部实现的。是的，为更漂亮的代码 +1 :)