安卓RecyclerView

效果图如图： 

首先加依赖（请读者对应自己的版本号）

implementation 'com.android.support:recyclerview-v7:27.1.1'

activity_main.xml中加入：

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

然后我们先写item，创建空活动item（即RecyclerView中的每一个小部分）

activity_item.xml：（这里的图片和名字都只是表明item图片和名字的位置，并非真正在RecyclerView中展示的item）

<?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="130dp"
    android:orientation="vertical"
    android:elevation="8dp"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@drawable/btn_background1"
        android:layout_marginBottom="0dp">
        <ImageView
            android:id="@+id/computer_image"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_weight="4"
            android:background="@drawable/computer"
            android:scaleType="centerCrop" />

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_marginRight="10dp"
            android:layout_weight="5"
            android:orientation="vertical">

            <TextView
                android:id="@+id/computer_name"
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="索尼vaio笔记本电脑"
                android:maxLines="2"
                android:textColor="#000000"
                android:textSize="19sp" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_marginBottom="10dp"
                android:layout_weight="1">

                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:orientation="vertical">



                </LinearLayout>

                <Button
                    android:id="@+id/computer_btn"
                    android:layout_width="80dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom"
                    android:layout_marginBottom="0dp"
                    android:textColor="#ffffff"
                    android:text="查看详情"
                    android:gravity="center"
                    android:background="@drawable/btn_skyblue" />

            </LinearLayout>
        </LinearLayout>
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:background="#11454545"/>
</LinearLayout>

然后我们写Computer类：（对应item中有一个TextView,一个ImageView,那个Button我们在类中不写它）

import android.content.ComponentName;
import android.provider.ContactsContract;

public class Computer {
    private String TextView;
    private int ImageId;
    public Computer(String TextView,int ImageId){
        this.TextView = TextView;
        this.ImageId = ImageId;
    }

    public int getImageId() {
        return ImageId;
    }

    public String getTextView() {
        return TextView;
    }

    public void setTextView(String textView) {
        TextView = textView;
    }
}

然后我们写适配器（连接作用，将我们的代码用图像的方式展示出来）（Button的点击事件我们就在适配器中写）

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.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class ComputerAdapter extends RecyclerView.Adapter<ComputerAdapter.ViewHolder> {
    private List<Computer> computers;
    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView textView;
        ImageView imageView;
        Button btn;
        public ViewHolder(View itemView) {
            super(itemView);
        textView = (TextView)itemView.findViewById(R.id.computer_name);
        imageView = (ImageView)itemView.findViewById(R.id.computer_image);
        btn = (Button)itemView.findViewById(R.id.computer_btn);
        }
    }
    public ComputerAdapter(List<Computer> computers){
        this.computers = computers;
    }
    @NonNull
    @Override
    public ComputerAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_item,parent,false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ComputerAdapter.ViewHolder holder, final int position) {
    Computer computer =computers.get(position);
    holder.imageView.setImageResource(computer.getImageId());
    holder.textView.setText(computer.getTextView());
    final int count = position+1;
    holder.btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(v.getContext(),"你点击了第 "+count+"个按钮",Toast.LENGTH_SHORT).show();
        }
    });
    }

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


}

最后在MainActivity中将整体联系起来（这里inits中为了效果明显我们循环了2次）

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

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

import static java.security.AccessController.getContext;

public class MainActivity extends AppCompatActivity {
    public List<Computer> computers = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RecyclerView recyclerView = findViewById(R.id.recyclerview);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        ComputerAdapter computerAdapter = new ComputerAdapter(computers);
        recyclerView.setAdapter(computerAdapter);
        inits();
    }
//    华硕(ASUS) 灵耀S 2代
//    惠普（HP）EliteBook
//    惠普（HP） 星14八代酷睿
    public void  inits(){
        for(int i=0;i<2;i++){
        Computer computer1 = new Computer("戴尔/DELL燃7000灵越 ",R.drawable.dell7000);
        computers.add(computer1);
        Computer computer2 = new Computer("华硕(ASUS) 灵耀S 2代",R.drawable.asus_s_2);
        computers.add(computer2);
        Computer computer3 = new Computer("惠普（HP）EliteBook",R.drawable.dellatitude);
        computers.add(computer3);
        Computer computer4 = new Computer("惠普（HP） 星14八代酷睿",R.drawable.hpxing8dai);
        computers.add(computer4);
        Computer computer5 = new Computer("惠普（HP）小欧a",R.drawable.hp15xiaooua);
        computers.add(computer5);}
    }
}