RecyclerView根据内容多少动态设置高度

技术开发Android
RecyclerView

在项目开发中我们经常会遇到需要RecyclerView和ScrollViewq嵌套的情况，一般我们都需要把RecyclerView中的内容全部显示，然后设置RV的高度为所有内容的高度+RV Padding+item 之间的Divider。
原理很简单，实现起来也很简单。

  • 创建RV ViewHolder

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    public abstract class  MyViewHolder extends RecyclerView.ViewHolder {

        TextView tv_item;
        ImageView img_delete_item;

        public MyViewHolder(View itemView) {
            super(itemView);
            tv_item = (TextView) itemView.findViewById(R.id.tv_single);
            img_delete_item = (ImageView) itemView.findViewById(R.id.img_toprecycle_delete);
        }


        public abstract void setFixedHeight();
    }

  • 实现自定义VH

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    public MyViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
            View view = mInflater.inflate(R.layout.item_useview, parent, false);
            MyViewHolder viewHolder = new MyViewHolder(view){
                @Override
                public void setFixedHeight() {
                    //  magic happening here
                    ViewGroup.LayoutParams parentParams = parent.getLayoutParams();
                    parentParams.height =
                            ((RecyclerView) parent).computeVerticalScrollRange()
                                    + parent.getPaddingTop()
                                    + parent.getPaddingBottom();
                    parent.setLayoutParams(parentParams);
                }
            };

            return viewHolder;
        }

  • 设置RV高度

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    //绑定viewholder
     public void onBindViewHolder(MyViewHolder holder, final int position) {
         holder.setFixedHeight();
     }
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