RecyclerView 的最最基本的使用

最终效果：

导入包：

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

recyclerview_demo_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <TextView
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="名字"
        android:textSize="45dp" />

</LinearLayout>

RecycleDemoAdapter

package com.example.tnt.recyclerview;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class RecycleDemoAdapter extends RecyclerView.Adapter<RecycleDemoAdapter.MyHolder> {

    private Context context;   // 方便视图的操作
    private List<String> list;
    public  RecycleDemoAdapter(Context context,List<String> list)
    {
        this.context = context;
        this.list = list;
    }

//
//    public void update(List<String> list)
//    {
//        this.list = list;
//        notifyDataSetChanged();
//    }
    // 获取 item 的布局
    @NonNull
    @Override
    public MyHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.recyclerview_demo_item,viewGroup,false);
        MyHolder myHolder = new MyHolder(view);
        return myHolder;
    }
    @Override
    public int getItemCount() {
        return list.size();
    }

    // 绑定类
    public class MyHolder extends RecyclerView.ViewHolder {
        TextView textView;
        public MyHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.name);
        }
    }
//   实际绑定 item 操作
    @Override
    public void onBindViewHolder(@NonNull MyHolder myHolder, final int position) {
        String s = list.get(position);
        myHolder.textView.setText(s);
        myHolder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "点击了:"+list.get(position), Toast.LENGTH_SHORT).show();
            }
        });
    }

}

MainActivity

package com.example.tnt.recyclerview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {


    private List<String> list = new ArrayList<>();
    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;
    private LinearLayoutManager layoutManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = findViewById(R.id.recyclerview);
        // 向list 里添加数据
        addData();

        adapter = new RecycleDemoAdapter(this,list);

//        设置 recyclerView 的 布局管理器
//        就是 recyclerview 的显示效果
        layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(layoutManager);

        recyclerView.setAdapter(adapter);

    }

    private void addData() {
        for (int i = 0; i < 100; i++) {
            list.add("开心："+i);
        }

    }

}