GridView网格控件

     GridView控件用于显示一个网格图像，GridView主要是用在一些相册的布局显示图片。

     GridView采用的是二维表的方式显示单元格，就需要设置二维表的行和列。

一、建立工程，如图

二、图片和xml

三、activity_main.xml中代码

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

   <GridView
       android:id="@+id/gridview"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:horizontalSpacing="6dp"
       android:numColumns="4"
       android:padding="20dp"
       android:verticalSpacing="6dp"
       >
       
   </GridView>
   <ImageView 
       android:id="@+id/imageview"
       android:layout_width="fill_parent"
       android:layout_height="150dp"
       
       />
    
</LinearLayout>

四、cell.xml中代码

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

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="48dp"
        android:layout_height="48dp"
         />

</LinearLayout>

五、Mainactivity.java中代码

package com.study.gridview;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ImageView;
import android.widget.SimpleCursorAdapter;

public class MainActivity extends Activity implements OnItemSelectedListener,OnItemClickListener{

    private ImageView imageView;
    private int[] resIds = new int[]{R.drawable.item1,R.drawable.item2,R.drawable.item3,
            R.drawable.item4,R.drawable.item5,R.drawable.item6,
            R.drawable.item7,R.drawable.item8,R.drawable.item9,
            R.drawable.item10,R.drawable.item11,R.drawable.item12,
            R.drawable.item13,R.drawable.item14,R.drawable.item15};
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        GridView gridView = (GridView)this.findViewById(R.id.gridview);
        List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
        for(int i=0;i<resIds.length;i++){
            Map<String, Object> cell = new HashMap<String, Object>();
            cell.put("imageview", resIds[i]);
            list.add(cell);
        }
        SimpleAdapter simpleAdapter = new SimpleAdapter(this, list, R.layout.cell, 
                new String[]{"imageview"}, new int[]{R.id.imageView1});
        gridView.setAdapter(simpleAdapter);
        imageView = (ImageView)this.findViewById(R.id.imageview);
        gridView.setOnItemClickListener(this);
        gridView.setOnItemSelectedListener(this);
        imageView.setImageResource(resIds[0]);
        
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        imageView.setImageResource(resIds[position]);
        
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position,
            long id) {
        imageView.setImageResource(resIds[position]);
        
    }


    @Override
    public void onNothingSelected(AdapterView<?> parent) {
        // TODO Auto-generated method stub
        
    }
    
}

六、效果图