使用RecyclerView实现列表功能

转载

mob604756fadec0 2021-06-27 00:42:00

使用RecyclerView实现列表功能

技术概述

RecyclerView相比ListView而言，封装了viewholder的回收复用，编写Adapter面向的是ViewHolder而不再是View了，复用的逻辑被封装了，写起来更加简单。

技术详述

在xml文件中添加RecyclerView控件
创建一个item.xml文件，为RecycleView的元素进行布局
创建设配器类adapter,该类继承RecyclerView.Adapter
下面介绍相关方法的作用：
ViewHolder()：绑定控件
构造方法SubProjectAdapter():初始化列表控件
onCreateViewHolder()：创建ViewHolder，返回每一项的布局
onBindViewHolder():将数据和控件绑定
getItemCount()：返回Item总条数


public class SubProjectAdapter extends RecyclerView.Adapter<SubProjectAdapter.ViewHolder>{

  public ViewHolder(@NonNull View view) {
          super(view);
          name = (TextView) view.findViewById(R.id.AllTitleTextView);
          description = (TextView)view.findViewById(R.id.AllDescriptionTextView);
          laucher = (TextView)view.findViewById(R.id.LaucherTextView);
          time = (TextView)view.findViewById(R.id.LauchTimeTextView);

      }
      
   public SubProjectAdapter(List<SubProject> mSubProjectList) {
      this.mSubProjectList = mSubProjectList;
  }
  @NonNull
  @Override
  public SubProjectAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
      View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.project_item,parent,false);
      ViewHolder viewHolder = new ViewHolder(view);
      return viewHolder;

  }

  @Override
  public void onBindViewHolder(@NonNull SubProjectAdapter.ViewHolder holder, int position) {
      SubProject subProject = mSubProjectList.get(position);
      holder.name.setText(subProject.getName());
      holder.name.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              Intent intent = new Intent(subProject.getContext(), MainActivity.class);
              intent.putExtra("data",subProject.getJsonObject().toString());
              subProject.getContext().startActivity(intent);
          }
      });
      holder.description.setText(subProject.getDescription());
      holder.laucher.setText(subProject.getLaucher());
      holder.time.setText(subProject.getTime());
  }

  @Override
  public int getItemCount() {
      return mSubProjectList.size();
  }
  
}

4.在Activity中，获取RecyclerView对象

5.初始化数据，适配器实例化，设置LayoutManager，设置Adapter

       initList();
       recyclerView = (RecyclerView)findViewById(R.id.ProjectRecyclerview);
       LinearLayoutManager layoutManager = new LinearLayoutManager(this);
       recyclerView.setLayoutManager(layoutManager);
       recyclerView.setAdapter(subProjectAdapter);