别再用ListView了，试试RecyclerView叭！

介绍

RecyclerView是ListView和GridView的继承者，有它俩的优点，也弥补了它们的不足；RecyclerView使用起来更灵活、简洁、更漂亮，更能实现我们想要的效果。
RecyclerView使用的很广泛，如下面的都能用RecyclerView实现
淘宝

网易云

下面我们就大概做这样的一个效果

使用

1、创建2个布局文件
一个放有RecyclerView组件
一个有是实现的样式xml

activity_mian.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recycler_test"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:layout_marginTop="5dp"
    />
    
</androidx.constraintlayout.widget.ConstraintLayout>

myrecycler.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="110dp"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >

<ImageView
    android:id="@+id/img_picture"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_rubbish01"
    android:layout_gravity="center_horizontal"
    />
    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="题目"
        android:textSize="20dp"
        />
</LinearLayout>

如图:
2、创建bean类用来保存myrecycler.xml中的组件的数据，创建get和set方法

infobean.java

package com.example.xianyu;
public class infoBean {
     
    private int picture;
    private String title;
  infoBean(int picture,String title){
     
      this.picture = picture;
      this.title = title;
  }

    public int getPicture() {
     
        return picture;
    }

    public void setPicture(int picture) {
     
        this.picture = picture;
    }

    public String getTitle() {
     
        return title;
    }

    public void setTitle(String title) {
     
        this.title = title;
    }

}

3、创建适配器，并设置item的点击事件
要点:
(1)、适配器继承自RecyclerView.Adapter
(2)、适配器里的泛型需自定义，并且继承自RecyclerView.ViewHolder，主要是实例化组件
(3)、onBindViewHolder方法，利用传进来的ArrayList，进行绑定数据
(4)、执行顺序:
onCreateViewHolder(找到布局)—>MyViewHolder(找到组件) —>onBindViewHolder(绑定数据)

myadapter.java

package com.example.xianyu;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;


public class myadapter extends RecyclerView.Adapter<myadapter.MyViewHolder>{
     
    private final Context context;
    List<infoBean> data = new ArrayList<infoBean>();
/*
自定义的构造方法 ，传入上下文对象context 和data数据
 */
myadapter(Context context, List<infoBean> data){
     
    this.context = context;
    this.data = data;
}
/*
getview
 */
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
     
    View view = View.inflate(context,R.layout.myrecycler,null);     
        return new MyViewHolder(view);
    }
/*
绑定数据
 */
    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
     
        
    infoBean bean = data.get(position);
       holder.picture.setImageResource(bean.getPicture());
        holder.title.setText(bean.getTitle());

        //设置item的点击事件
        holder.itemView.setOnClickListener(new View.OnClickListener() {
     
            @Override
            public void onClick(View view) {
     
                Toast.makeText(context,bean.getTitle(), Toast.LENGTH_LONG).show();
            }
        });
    }

    /*
    *得到总条数，返回data.size() 就可以了
    */
    @Override
    public int getItemCount() {
     
        return data.size();
    }

    /*
    也是getview
     */
    class MyViewHolder extends RecyclerView.ViewHolder{
     

          private ImageView picture;
          private TextView title;
           public MyViewHolder(@NonNull View itemView) {
     
            super(itemView);
            picture = itemView.findViewById(R.id.img_picture);
            title = itemView.findViewById(R.id.tv_title);
        }
    }
}

4、在主Activity设置RecyclerView
homeActivity.java

package com.example.xianyu;
import android.app.Activity;
import android.os.Bundle;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

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

public class homeActivity extends Activity {
     
  private RecyclerView mrecycler;
    List<infoBean> data = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
     
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mian);
        initDate();
mrecycler = findViewById(R.id.recycler_test);
//设置适配器
mrecycler.setAdapter(new myadapter(homeActivity.this,data));
//设置样式 ,有如下:
// LinearLayoutManager(Context context, @RecyclerView.Orientation int orientation,boolean reverseLayout)
//GridLayoutManager(Context context, int spanCount)
//StaggeredGridLayoutManager(int spanCount, int orientation)
mrecycler.setLayoutManager(new GridLayoutManager(homeActivity.this,3));
    }
//数据
    private void initDate() {
     
        data.add(new infoBean(R.drawable.ic_rubbish02,"干"));        
        data.add(new infoBean(R.drawable.ic_rubbish03,"湿"));
         data.add(new infoBean(R.drawable.ic_rubbish01,"有害"));
        data.add(new infoBean(R.drawable.ic_rubbish04,"其他"));
        data.add(new infoBean(R.drawable.ic_rubbish05,"回收"));
        data.add(new infoBean(R.drawable.ic_rubbish06,"厨余"));

    }
}

实现图:

总结

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