android 之GridView 的使用

 源文引入找不到地址了，在此做一个代码的备份，方使以后使用。

 先看一下效果图吧，

首先：看一样main.xml布局代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/bg"
    >
	<GridView
		android:id="@+id/gridview"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:numColumns="3"/>
		
</LinearLayout>

注：用以用到一展图片。bg.png

然后是每一个选项目的gridviewitem.xml 布局代码 ，用于展示每个选项的图标和名称

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent" android:scrollbars="vertical">
	 <ImageView   
               android:layout_height="100dip"   
               android:id="@+id/ItemImage"   
               android:layout_width="80dip" 
               android:src="@drawable/png1" 
               android:layout_gravity="center_horizontal"/> 
                 
         <TextView   
               android:layout_width="wrap_content"   
               android:layout_height="wrap_content" 
               android:layout_gravity="center"  
               android:id="@+id/ItemText" />  
</LinearLayout>

注：用以用到一展图片。png1.png

MainActivity.java

package net.csdn.blog.androidtoast;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
	//定义图片整型数组
	private int[] mImages={
			R.drawable.png1,
			R.drawable.png2,
			R.drawable.png3,
			R.drawable.png4,
			R.drawable.png5,
			R.drawable.png6,
			R.drawable.png7,
			R.drawable.png8,
			R.drawable.png9
	};
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //实例化GridView
        GridView mGridView=(GridView) findViewById(R.id.gridview);
        // 生成动态数组，并且传入数据
        ArrayList<HashMap<String, Object>> lstImageItem = new ArrayList<HashMap<String, Object>>();
        
        for (int i = 0; i < 9; i++) {
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("ItemImage", mImages[i]);// 添加图像资源的ID
            map.put("ItemText", "NO." + String.valueOf(i+1));// 按序号做ItemText
            lstImageItem.add(map);
        }
        //构建一个适配器
        SimpleAdapter simple = new SimpleAdapter(this, lstImageItem,
                R.layout.gridviewitem,
                new String[] { "ItemImage", "ItemText" }, new int[] {
                        R.id.ItemImage, R.id.ItemText });
        mGridView.setAdapter(simple);
        //添加选择项监听事件
        mGridView.setOnItemClickListener(new GridView.OnItemClickListener(){
			@Override
			public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
				Toast toast=Toast.makeText(getApplicationContext(), "你选择了"+(position+1)+"号图片", 1);
				toast.setGravity(Gravity.BOTTOM, 0, 0);
				toast.show();
				
			}
        });
        
    }
}