Android --Recyclerview 使用案例

步骤：

（1）添加依赖

（2）编写 Recyclerview子布局页面（xml）和子布局实体类(java)

（3）编写 Adapter 适配器类

（4）页面中调用 Recuclerview （activity和xml）

 

（1）在 app 下的 build.gradle 中添加 RecyclerView 依赖

//添加 RecyclerView 依赖包
implementation 'androidx.recyclerview:recyclerview:1.1.0'

（2）编写 Recyclerview子布局页面（xml）和子布局实体类(java)

recyclerview_item.xml (一个TextView 和一个Button)

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv"
        android:textSize="30sp"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/bt"/>

</LinearLayout>

 Bean.java (一个 textView的数据和一个 ButtonText的数据)

package xyz.lushangg.t8.recyclerview;

public class Bean {
    private String name;
    private String buttonText;

    public String getName(){
        return name;
    }
    public void setName(String name){
        this.name=name;
    }
    public String getButtonText() {
        return buttonText;
    }
    public void setButtonText(String buttonText) {
        this.buttonText = buttonText;
    }
}

（3）编写 Adapter 适配器类

package xyz.lushangg.t8.recyclerview;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

import xyz.lushangg.t8.R;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    //导入数据
    private List<Bean> data;

    //Context
    private Context context;

    //构造
    public MyAdapter(List<Bean> data, Context context) {
        this.data = data;
        this.context = context;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        //获取布局
        View view=View.inflate(context, R.layout.recyclerview_item,null);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        //赋值给 tv
        holder.tv.setText(data.get(position).getName());
        holder.bt.setText("按钮"+data.get(position).getButtonText());
    }

    @Override
    public int getItemCount() {
        return data==null?0: data.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        private TextView tv;
        private Button bt;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            tv=itemView.findViewById(R.id.tv);
            bt=itemView.findViewById(R.id.bt);

            bt.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if(mOnItemClickListener!=null){
                        //调用按钮点击接口方法
                        mOnItemClickListener.onButtonClick(getAdapterPosition());
                    }
                }
            });

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if(mOnItemClickListener !=null){
                        //调用接口的方法
                        mOnItemClickListener.onRecyclerItemClick(getAdapterPosition());
                    }
                }
            });
        }
    }

    //声明接口
    private OnRecyclerItemClickListener mOnItemClickListener;

    //赋值监听事件
    public void setRecyclerItemClickListener(OnRecyclerItemClickListener listener){
        mOnItemClickListener=listener;
    }

    //定义接口
    public interface OnRecyclerItemClickListener{
        void onRecyclerItemClick(int position);
        void onButtonClick(int position);
    }
}

 

（4）页面中调用 Recuclerview （activity和xml）

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">

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

MainActivity

package xyz.lushangg.t8;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.LinearLayout;
import java.util.ArrayList;
import java.util.List;
import xyz.lushangg.t8.recyclerview.Bean;
import xyz.lushangg.t8.recyclerview.MyAdapter;

public class MainActivity extends AppCompatActivity {
    private List<Bean> data=new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        for(int i=0;i<1000;i++){
            Bean bean=new Bean();
            bean.setName("RecyclerView --"+i);
            bean.setButtonText("按钮--"+i);
            data.add(bean);
        }

        //导入 view
        RecyclerView recyclerView= (RecyclerView) findViewById(R.id.rv);

        //为recyclerView 添加布局方向
        //LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        //recyclerView.setLayoutManager(linearLayoutManager);

//        GridLayoutManager gridLayoutManager=new GridLayoutManager(this,3);
//        recyclerView.setLayoutManager(gridLayoutManager);

        StaggeredGridLayoutManager staggeredGridLayoutManager=new StaggeredGridLayoutManager(3,LinearLayout.VERTICAL);
        recyclerView.setLayoutManager(staggeredGridLayoutManager);

        MyAdapter myAdapter=new MyAdapter(data,this);
        recyclerView.setAdapter(myAdapter);

        myAdapter.setRecyclerItemClickListener(new MyAdapter.OnRecyclerItemClickListener() {
            @Override
            public void onRecyclerItemClick(int position) {
                Log.e("点击Item项监听：","Click:"+position);
            }

            @Override
            public void onButtonClick(int position) {
                Log.e("点击按钮：","Click:"+position);
            }
        });

    }
}

效果：