Android Studio 实现九宫格功能

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

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent">

 <gridview
 android:id="@+id/gridview"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:verticalspacing="10dp"
 android:columnwidth="90dp"
 android:numcolumns="3"
 android:stretchmode="columnwidth"
 android:gravity="center"
 android:background="#f3dcf3">
 </gridview>
 <!--
 容器大小和父容器一样大：match_parent
 每列之间的间距为27dp：android:verticalspacing="27dp"
 指定列宽为90dp：android:columnwidth="90dp"
 每一行自动填充3个：android:numcolumns="3"
 空余的位置均分给列填充：android:stretchmode="columnwidth"
 显示位置居中：android:gravity="center"
 -->
</relativelayout>

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:background="#f3dcf3">


 <imageview
 android:id="@+id/itemimage"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerhorizontal="true">
 </imageview>

 <textview
 android:id="@+id/itemtext"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_below="@+id/itemimage"
 android:layout_centerhorizontal="true" >
 </textview>
 <!--
 该控件设置在相对于父控件水平居中的位置:layout_centerhorizontal="true"
 该控件位于@+id的下面：layout_below="@+id/itemimage"
 -->


</relativelayout>

package edu.hrbust.syoneninelayout;

import android.annotation.suppresslint;
import android.app.activity;
import android.os.bundle;
import android.view.view;
import android.widget.adapterview;
import android.widget.adapterview.onitemclicklistener;
import android.widget.gridview;
import android.widget.simpleadapter;
import android.widget.toast;

import java.util.arraylist;
import java.util.hashmap;

public class mainactivity extends activity {
 // 调用活动
 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 // 关联activity_main.xml 和 控件gridview
 setcontentview(r.layout.activity_main);
 gridview gridview = (gridview) findviewbyid(r.id.gridview);
 // 构建arraylist是hashmap格式，hashmap格式是<string,object>
 arraylist<hashmap<string,object>> meumlist = new arraylist<hashmap<string, object>>();
 // 向arraylist填入数据 图片+i i设置为1~9,形成九宫格
 for(int i = 1; i < 10; i++){
  hashmap<string,object> map = new hashmap<string, object>();
  //r.mipmap.ic_luminggai是关联的图片 我的图片在res的mipmap下面
  map.put("itemimage",r.mipmap.ic_luminggai);
  map.put("itemtext",""+i);
  meumlist.add(map);
 }
 // 构建数据适配器
 simpleadapter saitem = new simpleadapter(this,
  meumlist,
  r.layout.item,
  new string[]{"itemimage","itemtext"},
  new int[]{r.id.itemimage,r.id.itemtext});
 // 应用适配器
 gridview.setadapter(saitem);
 gridview.setonitemclicklistener(
  new onitemclicklistener() {
   @suppresslint("wrongconstant")
   public void onitemclick(adapterview<?> arg0, view arg1, int arg2, long arg3) {
   int index = arg2 + 1;
   toast.maketext(getapplicationcontext(),"点击了选项：" + index,0).show();
   }
  }
 );
 }
}