<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.a15083.testnine.MainActivity">

    <GridView
        android:id="@+id/grid_view"
        android:numColumns="3"
        android:stretchMode="columnWidth"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

//设置图片资源
    int[] imgId = new int[]{R.drawable.a,R.drawable.b,R.drawable.c,R.drawable.d,R.drawable.e,R.drawable.f,R.drawable.g,R.drawable.h,R.drawable.i,R.drawable.j,R.drawable.k,R.drawable.l,R.drawable.m,R.drawable.n,R.drawable.o};
    private SimpleAdapter simpleAdapter;