android 中RecyclerView 嵌套了 GridView 的用法

提醒一下 RecyclerView 安卓自带的当中是没有的，所以需要导入包的。

 

android.support.v4.widget.SwipeRefreshLayout 中的v7,v4都已经变成 androidx了。希望大家注意

android 由于升级 所以build.gradle中是添加，

 implementation 'androidx.recyclerview:recyclerview:1.0.0'
 implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.0.0'

如果版本较低的话，添加 

implementation 'com.android.support:recyclerview-v7:28.0.0'

项目结构 ，写的比较复杂，没有嵌套 需求，本文章就不要看了。

五个布局文件

activity_buttom.xml

activity_grid.xml

activity_griditem.xml

activity_main.xml

activity_topitem.xml

 创建实体类 Taobao

package com.example.myapplication.pojo;

public class Taobao {
    private String name;
    private String information;

    @Override
    public String toString() {
        return "Taobao{" +
                "name='" + name + '\'' +
                ", information='" + information + '\'' +
                '}';
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getInformation() {
        return information;
    }

    public void setInformation(String information) {
        this.information = information;
    }
}

 

创建gridview适配器

package com.example.myapplication.MyAdapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.example.myapplication.R;
import com.example.myapplication.pojo.Taobao;

import java.util.List;

//自定义带有GridLayOut布局的
public class GridViewAdapter extends BaseAdapter {

    private List taobaoList;

    private LayoutInflater inflater;
    public GridViewAdapter() {

    }

    public GridViewAdapter(List stuList, Context context) {
        this.taobaoList = stuList;
        this.inflater=LayoutInflater.from(context);
    }

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

    @Override
    public Taobao getItem(int position) {
        return taobaoList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //加载布局为一个视图
        final View view=inflater.inflate(R.layout.activity_griditem,null);
        ViewHolder viewHolder=new ViewHolder();

         Taobao taobao=getItem(position);
        viewHolder.t1=view.findViewById(R.id.t1);
        viewHolder.t1.setText(taobao.getName());
        viewHolder.t2=view.findViewById(R.id.t2);
        viewHolder.t2.setText(taobao.getInformation());
        return view;
    }

    class ViewHolder{
        TextView t1;
        TextView t2;
    }
}

 创建recycleview 适配器（里面有viewHolder）

package com.example.myapplication.MyAdapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;
import android.widget.TextView;

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


import com.example.myapplication.R;
import com.example.myapplication.pojo.Taobao;

import java.util.List;

public class RecyclerViewAdapter extends RecyclerView.Adapter {
    List list;    //数据集合
    Context context;
    String path1;
    String path2;
    private LayoutInflater layoutInflater;

    public RecyclerViewAdapter(List list, Context context,String path1,String path2){
        this.list=list ;
       this.path1=path1;
       this.path2=path2;
        this.context = context;
    }

//    这个方法是用来处理onCreateViewHolder方法中的viewtype 的
    @Override
    public int getItemViewType(int position) {
        System.out.println("getItemViewType  "+position);
        return position;
    }

//    初始化item布局
    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        RecyclerView.ViewHolder viewHolder=null;
        System.out.println("这里的 viewtype "+viewType);
        if(viewType==0){
            View view= LayoutInflater.from(context).inflate(R.layout.activity_topitem,parent,false);
            view.getLayoutParams().height=170;
            viewHolder=new TopHolder(view);
        }
        if(viewType==1){
            View view= LayoutInflater.from(context).inflate(R.layout.activity_grid,parent,false);
            viewHolder=new GridViewHolder(view);
        }
        if(viewType==2){
            View view= LayoutInflater.from(context).inflate(R.layout.activity_buttom,parent,false);
            view.getLayoutParams().height=100;
            viewHolder=new ButtomHolder(view);
        }
        return viewHolder;
    }

//    处理每一个item 的地方,绑定数据
    @Override
    public void onBindViewHolder( RecyclerView.ViewHolder holder, int position) {

        System.out.println("onBindViewHolder" +position);
        if(position==0){
            System.out.println("yongl ");
            TopHolder topHolder=(TopHolder)holder;
        }
        if( position==1){
            System.out.println("yong2 ");
           GridViewHolder gridViewHolder=(GridViewHolder)holder;
           gridViewHolder.gridView.setAdapter(gridViewHolder.gridViewAdapter);
        }
        if( position==2){
            System.out.println("yong3 ");
            ButtomHolder buttomHolder=(ButtomHolder)holder;
            buttomHolder.t1.setText(path1);
            buttomHolder.t2.setText(path2);
        }
    }

//    显示数量，因为我的布局文件就是三个，所以我返回san 
    @Override
    public int getItemCount() {
        return 3;
    }

    public class GridViewHolder extends RecyclerView.ViewHolder{

        public GridView gridView;
        public GridViewAdapter gridViewAdapter;

        public GridViewHolder(@NonNull View itemView) {
            super(itemView);
            gridView=itemView.findViewById(R.id.g1);
            gridViewAdapter=new GridViewAdapter(list,context);
        }

    }
    public class ButtomHolder extends RecyclerView.ViewHolder {

        public TextView t1;
        public TextView t2;
        public ButtomHolder(@NonNull View itemView) {

            super(itemView);
            t1=itemView.findViewById(R.id.t1);
            t2=itemView.findViewById(R.id.t2);
        }
    }
    public class TopHolder extends RecyclerView.ViewHolder {

        public TopHolder(@NonNull View itemView) {
            super(itemView);
        }
    }


}

最后是mainactivity

package com.example.myapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.RecyclerView.OnScrollListener;

import android.graphics.Rect;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import com.example.myapplication.MyAdapter.RecyclerViewAdapter;
import com.example.myapplication.pojo.Taobao;

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

public class MainActivity extends AppCompatActivity {

//    上面是 gridview 适配器

    private List taobaoList;

    private RecyclerViewAdapter recyclerViewAdapter;
    private RecyclerView recyclerView;

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

        recyclerView = findViewById(R.id.news_list);

        recyclerViewAdapter = new RecyclerViewAdapter(taobaoList, MainActivity.this, "num1", "num2");
        recyclerView.setLayoutManager(new GridLayoutManager(this, 1));
////      下面配置RecyclerView 布局
//        recyclerViewAdapter = new RecyclerViewAdapter(taobaoList, MainActivity.this);
        recyclerView.setAdapter(recyclerViewAdapter);
        recyclerView.addOnScrollListener(new OnScrollListener() {
            @Override
            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                Toast.makeText(MainActivity.this, "下拉刷新", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                Toast.makeText(MainActivity.this, "下拉刷新OnScrolled", Toast.LENGTH_SHORT).show();
            }
        });


    }

    public void initdata() {
        taobaoList = new ArrayList<>();
        String[] taobao_name = new String[]{
                "蓝月亮洗衣液组合", "南方黑芝麻糊360*3袋", "鞋刷软毛刷鞋刷子不伤血", "ANN骑士靴女高筒2019秋冬平底鞋",
                "凌平铺子-坚果大礼包", "黑麦片高纤维低脂", "君乐宝酸奶健存", "新品【三只松鼠】750g"
        };
        String[] taobao_price = new String[]{
                "￥22.2", "￥332", "￥213", "￥99.9", "￥19.9", "￥234", "￥222", "￥999", "￥888"
        };
        for (int i = 0; i < 8; i++) {
            Taobao stu = new Taobao();
            stu.setName(taobao_name[i]);
            stu.setInformation(taobao_price[i]);
            taobaoList.add(stu);
        }

    }
}