安卓RecyclerView简单用法

废话不多说上代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">
 
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" />
 
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

对应Activity

 
 
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 {
    private RecyclerView recyclerView1;
    private RecyclerView recyclerView2;
    private List<MenuData> dataList;
    MenuAdapter adapter;
    ListAdapter listAdapter;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        recyclerView1 = findViewById(R.id.recyclerView1);
        recyclerView2 = findViewById(R.id.recyclerView2);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
        recyclerView1.setLayoutManager(layoutManager);
 
        // 创建模拟数据
        createMockData();
 
        adapter = new MenuAdapter(dataList, selectedData -> {
            Log.d("菜单选择", selectedData.getName());
        });
        recyclerView1.setAdapter(adapter);
 
        LinearLayoutManager layoutManager2 = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        recyclerView2.setLayoutManager(layoutManager2);
 
        listAdapter = new ListAdapter(dataList, selectedData -> {
            Log.d("列表选择", selectedData.getName());
        });
        recyclerView2.setAdapter(listAdapter);
    }
 
    private void createMockData() {
        dataList = new ArrayList<>();
        for (int i = 1; i <= 10; i++) {
            MenuData data = new MenuData("Item " + i, i); // 假设 MenuData 类有一个带有字符串和整型参数的构造函数
            dataList.add(data); // 将新创建的 MenuData 对象添加到 dataList 中
        }
    }
}

 MenuData.实体类

public class MenuData {
    private String name;
    private int id;
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getId() {
        return id;
    }
 
    public void setId(int id) {
        this.id = id;
    }
 
    public MenuData(String name, int id) {
        this.name = name;
        this.id = id;
    }
}

对应适配器menuAdapter,主要实现菜单选择

 
import android.graphics.Color;
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 MenuAdapter extends RecyclerView.Adapter<MenuAdapter.ViewHolder> {
    private List<MenuData> dataList;
    private int selectedPosition = -1;
    private OnItemSelectedListener listener;
 
    public MenuAdapter(List<MenuData> dataList, OnItemSelectedListener listener) {
        this.dataList = dataList;
        this.listener = listener;
    }
 
    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // 创建 ViewHolder
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new ViewHolder(view);
    }
 
    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        // 绑定数据到 ViewHolder
        MenuData data = dataList.get(position);
        holder.bindData(data);
        holder.itemView.setOnClickListener(v -> {
            if (listener != null) {
                selectedPosition = position;
                notifyDataSetChanged(); // 刷新列表以更新选中项的样式
                listener.onItemSelected(dataList.get(position));
            }
        });
 
        // 设置选中项的样式
        if (position == selectedPosition) {
            holder.textView.setTextColor(Color.BLUE);
        } else {
            holder.textView.setTextColor(Color.BLACK);
        }
    }
 
    @Override
    public int getItemCount() {
        // 返回数据列表的大小
        return dataList.size();
    }
 
    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView textView;
 
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
        }
 
        public void bindData(MenuData data) {
            // 绑定数据到视图
            textView.setText(data.getName());
        }
    }
 
    public interface OnItemSelectedListener {
        void onItemSelected(MenuData selectedData);
    }
}

item_layout.xml

<!-- item_layout.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="8dp">
 
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:textColor="@android:color/black"/>
 
</LinearLayout>

接下来就是 ListAdapter适配器，这个主要实现向下列表得

 
 
import android.graphics.Color;
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 ListAdapter extends RecyclerView.Adapter<ListAdapter.ListViewHolder> {
    private List<MenuData> dataList;
    private OnItemSelectedListener listener;
    private MenuData selectedData;
 
    public ListAdapter(List<MenuData> dataList, OnItemSelectedListener listener) {
        this.dataList = dataList;
        this.listener = listener;
    }
 
    @NonNull
    @Override
    public ListViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent, false);
        return new ListViewHolder(view);
    }
 
    @Override
    public void onBindViewHolder(@NonNull ListViewHolder holder, int position) {
        MenuData data = dataList.get(position);
        holder.bind(data, listener, data == selectedData);
    }
 
    @Override
    public int getItemCount() {
        return dataList.size();
    }
 
    public void updateSelectedData(MenuData selectedData) {
        this.selectedData = selectedData;
        notifyDataSetChanged();
    }
 
    public static class ListViewHolder extends RecyclerView.ViewHolder {
        private TextView textView;
 
        public ListViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
        }
 
        public void bind(MenuData data, OnItemSelectedListener listener, boolean isSelected) {
            textView.setText(data.getName());
            itemView.setBackgroundColor(isSelected ? Color.LTGRAY : Color.WHITE);
 
            itemView.setOnClickListener(v -> {
                if (listener != null) {
                    listener.onItemSelected(data);
                }
            });
        }
    }
 
    public interface OnItemSelectedListener {
        void onItemSelected(MenuData selectedData);
    }
}

对应item_list.xml

<!-- item_layout.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="8dp">
 
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:textColor="@android:color/black"/>
 
</LinearLayout>

最后效果图