Android——GridView

layout文件：

 <?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:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.hanqi.testapp2.TestActivity9">

     <GridView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:id="@+id/gv_1"
         android:numColumns="4"
         android:stretchMode="columnWidth"
         android:gravity="center"
         android:horizontalSpacing="30dp"></GridView>
 </LinearLayout>

java类：

 package com.hanqi.testapp2;

 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.GridView;
 import android.widget.ImageView;

 import java.util.ArrayList;
 import java.util.List;

 public class TestActivity9 extends AppCompatActivity {

     GridView gv_1;
     List<Integer> liv;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_test9);
         gv_1 = (GridView)findViewById(R.id.gv_1);

         //1、数据 图片的id
         liv = new ArrayList<>();
         liv.add(R.drawable.f1);
         liv.add(R.drawable.f2);
         liv.add(R.drawable.f3);
         liv.add(R.drawable.f4);
         liv.add(R.drawable.f5);
         liv.add(R.drawable.f6);
         liv.add(R.drawable.f7);
         liv.add(R.drawable.f8);
         gv_1.setAdapter(new ImageAdapter());
     }
     //适配器
     class ImageAdapter extends BaseAdapter
     {
         @Override
         public int getCount() {
             return liv.size();
         }

         @Override
         public Object getItem(int position) {
             return liv.get(position);
         }

         @Override
         public long getItemId(int position) {
             return 0;
         }

         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             //1.得到数据 图片的id
             Integer ivid = liv.get(position);
             //2.准备View
             if (convertView ==null) {
                 convertView = new ImageView(TestActivity9.this);
             }
             //3.适配
             //转换
             ImageView imageView = (ImageView)convertView;
             imageView.setImageResource(ivid);

             //imageView.setMaxHeight(70);
             //imageView.setMaxWidth(70);

             imageView.setLayoutParams(new GridView.LayoutParams(110, 110));

             return imageView;
         }
     }
 }

效果图为：