android 中RecyclerView 嵌套了 GridView 的用法
16lz
2021-01-23
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
<?xml version="1.0" encoding="utf-8"?> activity_grid.xml
<?xml version="1.0" encoding="utf-8"?> activity_griditem.xml
<?xml version="1.0" encoding="utf-8"?> activity_main.xml
<?xml version="1.0" encoding="utf-8"?> activity_topitem.xml
<?xml version="1.0" encoding="utf-8"?> 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); } }}
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