RecyclerView根据条目设置高度,固定RecyclerView列表区域的高度,超出范围的,在范围内上下滑动

比眉伴天荒 2023-01-23 14:49 22阅读 0赞

应用场景:参考的效果是2345天气app的侧边栏的收藏城市列表的效果  
想做出来的效果是:当rv(RecyclerView)的item数量达到某个值时,固定rv布局列表的高度,多出来的item在rv的布局里上下滑动:

**效果步骤:1.在xml里布局里RecyclerView的layout\_height一定要设置wrap\_content**，如图所示:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NoaVhpblhpbl9IYXJib3Vy_size_16_color_FFFFFF_t_70_pic_center]  
第二步:Java代码

void editRvHeight() { 
            //编辑的rv
            RecyclerView.Adapter editAdapter = mRvEditCollect.getAdapter();
            int itemCount2 = editAdapter.getItemCount();
            if (itemCount2 > 0) { 
                RecyclerView.ViewHolder editHolder = editAdapter.createViewHolder(mRvEditCollect, editAdapter
                        .getItemViewType(1));
                editAdapter.onBindViewHolder(editHolder, 1);
                editHolder.itemView.measure(
                        View.MeasureSpec.makeMeasureSpec(mRvEditCollect.getWidth(), View.MeasureSpec.EXACTLY),
                        View.MeasureSpec.makeMeasureSpec(1, View.MeasureSpec.UNSPECIFIED));
                editHolder.itemView.layout(1, 1, editHolder.itemView.getMeasuredWidth(),
                        editHolder.itemView.getMeasuredHeight());
                editHolder.itemView.setDrawingCacheEnabled(true);
                editHolder.itemView.buildDrawingCache();
    
                int measuredHeight = editHolder.itemView.getMeasuredHeight();
                LinearLayout.LayoutParams editLeftLayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                        measuredHeight * 10);
                mRvEditCollect.setLayoutParams(editLeftLayoutParams);
            }
    
        }

效果就是类似吸顶的哪种效果,其实也不是,数量到达一定高度,固定高度内进行滑动，步影响其它的功能区域  
效果画面图:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NoaVhpblhpbl9IYXJib3Vy_size_16_color_FFFFFF_t_70_pic_center 1]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NoaVhpblhpbl9IYXJib3Vy_size_16_color_FFFFFF_t_70_pic_center]: /images/20221004/2d509d7da8864fe3a1fdd6144f09ce4d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NoaVhpblhpbl9IYXJib3Vy_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221004/e85c91c9e68b4426b3ae9688b853b06f.png