<?xml version="1.0" encoding="utf-8"?>

<GridView xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:id="@+id/gv_1"

    android:numColumns="auto_fit"

    android:verticalSpacing="10dp"

    android:horizontalSpacing="10dp"

    android:columnWidth="100dp"

    android:gravity="center"

    android:stretchMode="columnWidth">

    <!--stretchMode:缩放模式  columnWidth:根据列宽来设-->

</GridView>

package com.hanqi.test5;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.Toast;

public class UIActivity6 extends AppCompatActivity {

    int[] imid;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_ui6);

        GridView gv_1 =(GridView)findViewById(R.id.gv_1);

        imid = new int[]{R.drawable.yuantu,R.drawable.yuantu,R.drawable.yuantu,R.drawable.yuantu,R.drawable.yuantu

        ,R.drawable.yuantu,R.drawable.yuantu,R.drawable.yuantu};

        gv_1.setAdapter(new MyBaseAdapter());

        gv_1.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override

            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Toast.makeText(UIActivity6.this, "position =" + position, Toast.LENGTH_SHORT).show();

            }

        });

    }

    class MyBaseAdapter extends BaseAdapter

    {

        @Override

        public int getCount() {

            return imid.length;

        }

        @Override

        public Object getItem(int position) {

            return imid[position];

        }

        @Override

        public long getItemId(int position) {

            return position;

        }

        @Override

        public View getView(int position, View convertView, ViewGroup parent) {

            //获取数据

            int Imageid = imid[position];

            //构造视图

            ImageView iv_1 = null;

            if (convertView == null)

            {

                iv_1 = new ImageView(UIActivity6.this);

                iv_1.setLayoutParams(new GridView.LayoutParams(100,100));  //属性设置

                iv_1.setScaleType(ImageView.ScaleType.FIT_XY);  //FIT_XY:自动全部充满

            }

            else

            {

               iv_1 = (ImageView)convertView;  //强转

            }

            iv_1.setImageResource(Imageid);

            return iv_1;

        }

    }

}