前言

RecyclerView是ListView的加強版，一樣的是他們的有 Adapter 來呈現 handle item view的內容。不一樣的是它比 ListView 更彈性。

操作

第一步：添加需要使用的套件到build.dradle

implementation 'com.android.support:recyclerview-v7:30.4.0'

第二步：在布局文件放入 RecyclerView

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

第三步：製作 RecyclerView 的樣式 (item.xml)

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="178dp"
        android:layout_height="38dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="213dp"
        android:layout_height="40dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/textView1"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

第四步：在主程式呼叫需要使用的元件以及 RecyclerView 的基本語法

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
 RecyclerView recyclerView;
 List<String> grop=new ArrayList<>();
 List<String> customer=new ArrayList<>();
    private MyAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = findViewById(R.id.recyclerview);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        for(int i=1;i<4;i++){
            String number =String.valueOf(i);
            String many =String.valueOf(i+3);
         grop.add(number);
         customer.add(many);
            recyclerView.setAdapter(new MyAdapter(grop,customer));
        }

    }
}

第五步：製作 RecyclerView 的 adapter

package com.example.testr;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.VH> {
    public static class VH extends RecyclerView.ViewHolder{
    //此段放當傳入值時要顯示在 item 上的元件
        public  TextView textView1,textView2;
        public VH(View v) {
            super(v);
            textView1 = v.findViewById(R.id.textView1);
            textView2 = v.findViewById(R.id.textView2);

        }
    }
    //此段為在主程式接收的資料
    private List<String> mgrop;
    private List<String> mcostomer;
    public MyAdapter(List<String> grop,List<String> costomer) {
        this.mgrop = grop;
        this.mcostomer = costomer;
    }
    @NonNull
    @Override
    public MyAdapter.VH onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
        return new VH(v);
    }
    
    @Override
    //此段為顯示在item
    public void onBindViewHolder(@NonNull MyAdapter.VH holder, int position) {
        holder.textView1.setText(mgrop.get(position));
        holder.textView2.setText(mcostomer.get(position));
    }

    @Override
    //此段為知道有幾筆資料
    public int getItemCount() {
        return mgrop.size();
    }
}

**注意！！！
**如只顯示一筆請將 RecyclerView 的 item 的高設為 wrap_content