android 中的 gridview 的用法

喜欢ヅ旅行 2023-05-29 05:23 31阅读 0赞

# 两个布局文件 #

actity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    
        <GridView
            android:id="@+id/gv_1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:horizontalSpacing="10dp"
            android:numColumns="5"
            android:verticalSpacing="10dp" />
    </LinearLayout>

layout\_grid\_item.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical" android:layout_width="match_parent"
        android:layout_height="match_parent">
            <ImageView
                android:id="@+id/iv_1"
                android:layout_height="80dp"
                android:layout_width="80dp"
                android:background="@color/colorPrimary"
                android:scaleType="fitCenter"
                android:layout_marginLeft="10dp"
                />
           <TextView
               android:id="@+id/tv_1"
              android:layout_width="80dp"
              android:layout_height="20dp"
              android:layout_marginTop="10dp"
              android:layout_marginLeft="10dp"
              android:gravity="center"
              android:text="天猫" />
    </LinearLayout>

# 创建实体类 Icon #

package com.example.taobao;
    
    import java.util.Arrays;
    import java.util.List;
    
    public class Icon {
        public Icon() {
        }
    
        @Override
        public String toString() {
            return "Icon{" +
                    "name='" + name + '\'' +
                    ", picture=" + picture +
                    '}';
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Integer getPicture() {
            return picture;
        }
    
        public void setPicture(Integer picture) {
            this.picture = picture;
        }
    
        public Icon(String name, Integer picture) {
            this.name = name;
            this.picture = picture;
        }
    
        private String name;
        private Integer picture;
    
    }

#  创建 适配器 MyAdapter #

package com.example.taobao;
    
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.ImageView;
    import android.widget.TextView;
    
    import java.net.StandardSocketOptions;
    import java.util.List;
    
    public class MyAdpter extends BaseAdapter {
        private List<Icon> iconlist;
        //声明引用
        private Context context; //第三方加载图片时用到
        private LayoutInflater layoutInflater;
    
         public MyAdpter(Context context,List<Icon> iconList){
             this.iconlist=iconList;
             this.context=context;
             //利用Layout Inflate把控件所在的布局文件加载到当前类中
             //实例化layoutinflater
             layoutInflater=LayoutInflater.from(context);
         }
    
    
    
    
    
        @Override
        public int getCount() {
            return iconlist.size();
        }
    
        @Override
        public Object getItem(int position) {
            return position;
        }
    
        @Override
        public long getItemId(int position) {
            return position;
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder=null;
    
            if(convertView==null){
                convertView=layoutInflater.inflate(R.layout.layout_grid_item,null);
                holder=new ViewHolder();
                holder.Grid_imageview=convertView.findViewById(R.id.iv_1);
                holder.Grid_textview=convertView.findViewById(R.id.tv_1);
    
                convertView.setTag(holder);
            }else {
                holder=(ViewHolder)convertView.getTag();
            }
            Icon icon= iconlist.get(position);
            System.out.println("要 "+icon);
            holder.Grid_textview.setText("dadsda");
            holder.Grid_imageview.setImageResource(icon.getPicture());
    
            return convertView;
        }
        //写一个静态的class 把layout_grid 的控件转移过来使用
        class ViewHolder{
            public ImageView Grid_imageview;
            public TextView Grid_textview;
        }
    }

# MainActivity #

package com.example.taobao;
    
    import androidx.appcompat.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    import android.widget.GridView;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class MainActivity extends AppCompatActivity {
     private GridView Gv1;
     private MyAdpter myAdpter;
     private List<Icon> iconList;
     private  int count=8;
     private Integer iconid;
     private String [] name=new String[]{"天猫","聚划算","天猫国际","外卖","天猫超市",
             "充值中心","飞猪旅行","领金币","拍卖","分类"};
     private Integer[] picture=new Integer[12];
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Gv1=findViewById(R.id.gv_1);
            iconList=new ArrayList<>();
            for(int i=0;i<count;i++){
                Icon icon=new Icon();
                // getIdentifier()有三个参数，
                //第一个为你的图片资源名称也就是 use1 等，由于我的图片是从1开始所以要加i+1
                // 第二个为资源目录名称，PS：如果你的图片是放在mipmap目录下，可以将drawable修改为mipmap即可
                iconid=getResources().getIdentifier("tb"+(i+1),"drawable",getPackageName());
                icon.setName(name[i]);
                icon.setPicture(iconid);
                 iconList.add(icon);
    
            }
            System.out.println(iconList);
            myAdpter=new MyAdpter(MainActivity.this,iconList);
            Gv1.setAdapter(myAdpter);
    
        }
    }

# 项目结构图：  #

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