前言
实在不知道这玩意应该怎么叫。
之前做底部列表弹窗的时候被UI要求过根据数据量调整列表的高度。
举例：列表里如果有超过5条数据，那列表的高度就是5个item的高度。
当时列表是用ListView做的,贴出当时做的代码
/**
* 根据最多显示item设置list的高度
*
* @param listMaxHeightWhitItem
*/
private void setListViewHeight(int listMaxHeightWhitItem) {
ListAdapter listAdapter = lvList.getAdapter();
if (listAdapter == null) {
return;
}
//获取其中的一个
View itemView = listAdapter.getView(0, null, lvList);
itemView.measure(0, 0);
int itemHeight = itemView.getMeasuredHeight();
int itemCount = listAdapter.getCount();
LinearLayout.LayoutParams layoutParams = null;
if (itemCount <= listMaxHeightWhitItem) {
layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
itemHeight * itemCount);
} else if (itemCount > listMaxHeightWhitItem) {
layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
itemHeight * listMaxHeightWhitItem);
}
lvList.setLayoutParams(layoutParams);
}
最近新做的项目都已经用RecyclerView代替了ListView，想着也做下这个功能。但是RecyclerView并没有getView()这样的方法。本来觉得也挺简单的，在网上找找RecyclerView获取itemView的方法就搞定了。没想到连着看了几篇文章没一个靠谱。这里记录我最后的做法
RecyclerView.Adapter adapter = rvScreenshot.getAdapter();
int itemCount = adapter.getItemCount();
if (itemCount >0){
RecyclerView.ViewHolder holder = adapter.createViewHolder(rvScreenshot, adapter
.getItemViewType(0));
adapter.onBindViewHolder(holder, 0);
holder.itemView.measure(
View.MeasureSpec.makeMeasureSpec(rvScreenshot.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),
holder.itemView.getMeasuredHeight());
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
int measuredHeight = holder.itemView.getMeasuredHeight();
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
measuredHeight * 5);
rvScreenshot.setLayoutParams(layoutParams);
}
