一、在新建GridView模块下添加图片以及创建cell.xml文件

1.粘贴图片时选择红框中的路径，点击“OK”

2.在路径后添加-mdpi后缀,再点击“OK”

二、相关代码块

1.MainActivity.java文件代码

package com.example.gridview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.GridView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {
    private int[] picture = new int[]{R.drawable.p1,R.drawable.p2,R.drawable.p3,R.drawable.p4,
            R.drawable.p5,R.drawable.p6,R.drawable.p7,R.drawable.p8,R.drawable.p9};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        GridView gridView = (GridView) findViewById(R.id.gridview);
        List<Map<String ,Object>> listitem = new ArrayList<Map<String,Object>>();
        for(int i=0;i<picture.length;i++){
            Map<String ,Object> map = new HashMap<String,Object>();
            map.put("image",picture[i]);
            listitem.add(map);
        }
        SimpleAdapter simpleAdapter = new SimpleAdapter(this,listitem,R.layout.cell,new String[]{"image"},new int[]{R.id.image});
        gridView.setAdapter(simpleAdapter);
    }
}

2.activity_main.xml文件代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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/gridview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:numColumns="3">

    </GridView>

</RelativeLayout>

3.cell.xml文件代码

<?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/image"
        android:layout_width="100dp"
        android:layout_height="75dp"/>

</LinearLayout>

四、运行结果