android: 用RecyclerView显示列表

一，代码：

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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".activity.Recycle1Activity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

单个item

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/textItem"
    android:layout_width="match_parent"
    android:layout_height="60dp"
    android:gravity="center_vertical"
    android:padding="16dp"
    android:textSize="18sp"/>

Activity

package com.example.okdemo1.activity;

import android.os.Bundle;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.example.okdemo1.R;
import com.example.okdemo1.adapter.MyRecycleAdapter;

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

public class Recycle1Activity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private MyRecycleAdapter adapter;
    private List<String> stringList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_recycle1);

        recyclerView = findViewById(R.id.recyclerView);
        stringList = new ArrayList<>();

        // 添加测试数据
        for (int i = 1; i <= 20; i++) {
            stringList.add("第 " + i + " 项");
        }

        adapter = new MyRecycleAdapter(stringList);
        recyclerView.setLayoutManager(new LinearLayoutManager(this)); // 垂直列表
        recyclerView.setAdapter(adapter);
        
    }
}

adapter

package com.example.okdemo1.adapter;

import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.recyclerview.widget.RecyclerView;

import com.example.okdemo1.R;

import java.util.List;

public class MyRecycleAdapter extends RecyclerView.Adapter<MyRecycleAdapter.MyViewHolder> {
    private final List<String> dataList;

    public MyRecycleAdapter(List<String> dataList) {
        this.dataList = dataList;
    }

    // ViewHolder：缓存 item 控件
    static class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textItem;

        MyViewHolder(View itemView) {
            super(itemView);
            textItem = itemView.findViewById(R.id.textItem);
        }
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_text, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        holder.textItem.setText(dataList.get(position));
    }

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

 

 

二，测试效果: