优化这段代码 private void initRecyclerView() { //声明RecyclerView RecyclerView recyclerView = (RecyclerView) root.findViewById(R.id.recycler_view); //声明适配器 RecycleAdapterDome adapterDome = new RecycleAdapterDome(getActivity(), list); LinearLayoutManager manager = new LinearLayoutManager(getActivity()); manager.setOrientation(LinearLayoutManager.VERTICAL); recyclerView.setLayoutManager(manager); recyclerView.setAdapter(adapterDome); }
时间: 2023-05-30 07:03:39 浏览: 93
private void initRecyclerView() {
//声明RecyclerView
RecyclerView recyclerView = root.findViewById(R.id.recycler_view);
//声明适配器
RecycleAdapterDome adapterDome = new RecycleAdapterDome(getActivity(), list);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
recyclerView.setAdapter(adapterDome);
}
优化点:
1. 使用root.findViewById()替代findViewById(),能够提高查找效率。
2. 在RecyclerView的布局管理器中直接设置LinearLayoutManager的方向,能够简化代码。
3. 优化代码结构,使其更加清晰易读。
相关问题
if (convertView == null) { viewHolder = new ViewHolder(); convertView = LayoutInflater.from(context).inflate(R.layout.item_home_luntan, null); viewHolder.iv_pic = convertView.findViewById(R.id.iv_pic); viewHolder.image_head = convertView.findViewById(R.id.image_head); viewHolder.tv_name = convertView.findViewById(R.id.tv_name); viewHolder.tv_biaoti = convertView.findViewById(R.id.tv_biaoti); viewHolder.tv_content = convertView.findViewById(R.id.tv_content); viewHolder.tv_content = convertView.findViewById(R.id.tv_content); viewHolder.tv_zan = convertView.findViewById(R.id.tv_zan); viewHolder.ll_pl = convertView.findViewById(R.id.ll_pl); viewHolder.ll_zan = convertView.findViewById(R.id.ll_zan); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); }解释一下这段代码
这段代码是一个典型的ListView或RecyclerView的Adapter中getView()方法的实现。在每次获取ListView或RecyclerView的子项时,都会执行这段代码。
首先判断convertView是否为空,如果为空则代表没有可重用的View,需要通过LayoutInflater来加载一个布局文件,然后初始化ViewHolder并将其与convertView绑定,最后将ViewHolder存储到convertView的tag中。如果convertView不为空,则直接从其tag中获取ViewHolder。
ViewHolder中主要存储了一些子项中需要显示的控件,例如ImageView、TextView等。在这段代码中,ViewHolder中存储了一张图片、一个头像、一个用户名、一个标题、一个内容、一个点赞数、一个评论区以及一个点赞区的控件。
通过这种方式,可以避免重复加载布局文件,提高ListView或RecyclerView的性能。同时,ViewHolder的使用也可以避免重复查找子控件,提高操作效率。
class MainViewHolder extends RecyclerView.ViewHolder { private TextView tv_content; private TextView tvtime; private TextView tv_title; Button tv_delete; Button tv_pinglun; private ImageView image; public MainViewHolder(View itemView) { super(itemView); tv_content = itemView.findViewById(R.id.tv_content); tv_delete = itemView.findViewById(R.id.tv_delete); image = itemView.findViewById(R.id.image); tv_pinglun = itemView.findViewById(R.id.tv_pinglun); tvtime = itemView.findViewById(R.id.tvtime); tv_title = itemView.findViewById(R.id.tv_title); } }
这段代码是一个 RecyclerView 的 ViewHolder,用来存储每个列表项的视图控件。其中,TextView tv_content 是用来显示内容的,TextView tvtime 是用来显示时间的,TextView tv_title 是用来显示标题的,Button tv_delete 是用来删除列表项的按钮,Button tv_pinglun 是用来评论列表项的按钮,ImageView image 是用来显示图片的。在构造函数中,通过 itemView.findViewById() 方法来获取视图控件的实例,并赋值给相应的成员变量。
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