[笔记]android UI ------ GridView

GridView按照行列的方式来显示内容，一般适合显示图标、图片等内容，主要用于设置Adapter
在这里主要是基础BaseAdapter类，重写其中的方法，主要是重写getView方法设置图片的显示格式

实例代码如下
GridViewTest.java

  1 /*
  2 * @author hualang
  3 */
  4 package org.hualang.grid;
  5 
  6 import android.app.Activity;
  7 import android.content.Context;
  8 import android.os.Bundle;
  9 import android.view.View;
 10 import android.view.ViewGroup;
 11 import android.widget.BaseAdapter;
 12 import android.widget.GridView;
 13 import android.widget.ImageView;
 14 
 15 public class GridViewTest extends Activity {
 16     /** Called when the activity is first created. */
 17         private GridView gv;
 18     @Override
 19     public void onCreate(Bundle savedInstanceState) {
 20         super.onCreate(savedInstanceState);
 21         setContentView(R.layout.main);
 22         
 23         //通过findViewById方法获得GridView对象
 24         gv=(GridView)findViewById(R.id.GridView01);
 25         //设置GridView的行数
 26         gv.setNumColumns(4);
 27         gv.setAdapter(new MyAdapter(this));
 28     }
 29     //自定义适配器
 30     class MyAdapter extends BaseAdapter
 31     {
 32             //图片id数组
 33             private Integer[] imgs={
 34                             R.drawable.img01,
 35                             R.drawable.img02,
 36                             R.drawable.img03,
 37                             R.drawable.img04,
 38                             R.drawable.img05,
 39                             R.drawable.img06,
 40                             R.drawable.img07,
 41                             R.drawable.img08,
 42                             
 43                             R.drawable.img01,
 44                             R.drawable.img02,
 45                             R.drawable.img03,
 46                             R.drawable.img04,
 47                             R.drawable.img05,
 48                             R.drawable.img06,
 49                             R.drawable.img07,
 50                             R.drawable.img08
 51             };
 52             //上下文对象
 53             Context context;
 54             //构造方法
 55             MyAdapter(Context context)
 56             {
 57                     this.context=context;
 58             }
 59             //获得数量
 60             public int getCount()
 61             {
 62                     return imgs.length;
 63             }
 64             //获得当前选项
 65             public Object getItem(int item)
 66             {
 67                     return item;
 68             }
 69             //获得当前选项id
 70             public long getItemId(int id)
 71             {
 72                     return id;
 73             }
 74             
 75             //创建View方法
 76             public View getView(int position,View convertView,ViewGroup parent)
 77             {
 78                     ImageView imageView;
 79                     if(convertView==null)
 80                     {
 81                             //实例化ImageView对象
 82                             imageView=new ImageView(context);
 83                             //设置ImageView对象布局
 84                             imageView.setLayoutParams(new GridView.LayoutParams(45,45));
 85                             //设置边界对齐
 86                             imageView.setAdjustViewBounds(false);
 87                             //设置刻度类型
 88                             imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
 89                             //设置间距
 90                             imageView.setPadding(8,8,8,8);
 91                     }else
 92                     {
 93                             imageView=(ImageView)convertView;
 94                     }
 95                     //为ImageView设置图片资源
 96                     imageView.setImageResource(imgs[position]);
 97                     return imageView;
 98             }
 99                 
100     }
101 }

main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7 <GridView 
 8         android:id="@+id/GridView01" 
 9         android:layout_width="wrap_content" 
10         android:layout_height="wrap_content"></GridView>
11 </LinearLayout>

运行结果如下

posted on 2012-07-24 16:43 藤藤蔓蔓阅读(403) 评论(2) 编辑收藏举报