android学习---gridview

布局文件：

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FFFFFF"
    android:orientation="horizontal" >

    <GridView
        android:id="@+id/gridview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:horizontalSpacing="10dp"
        android:numColumns="3"
        android:padding="20dp"
        android:verticalSpacing="10dp" >
    </GridView>

    <ImageView
        android:id="@+id/imageview"
        android:layout_width="fill_parent"
        android:layout_height="150dp" >
    </ImageView>

</LinearLayout>

新建xml文件，cell.xml

<?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/imageview"
        android:layout_width="72dp"
        android:layout_height="72dp" >
    </ImageView>

</LinearLayout>

实现代码：

package com.leaf.android;

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

import android.app.Activity;
import android.os.Bundle;
import android.telephony.CellLocation;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.SimpleAdapter;

public class Main extends Activity implements OnItemClickListener,
        OnItemSelectedListener {

    private ImageView imageView;
    private GridView gridView;
    private int[] resIds = new int[] { R.drawable.car1, R.drawable.car2,
            R.drawable.car3, R.drawable.car4, R.drawable.car5, R.drawable.car6,
            R.drawable.car7, R.drawable.car8, R.drawable.car9 };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        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(Main.this, list,
                R.layout.cell, new String[] { "imageview" },
                new int[] { R.id.imageview });
        gridView.setAdapter(simpleAdapter);
        imageView = (ImageView) this.findViewById(R.id.imageview);
        gridView.setOnItemSelectedListener(this);
        gridView.setOnItemClickListener(this);
        imageView.setImageResource(resIds[0]);

    }

    public void onItemSelected(AdapterView<?> parent, View view, int position,
            long id) {
        // TODO Auto-generated method stub
        imageView.setImageResource(resIds[position]);
    }

    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }

    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        // TODO Auto-generated method stub
        imageView.setImageResource(resIds[position]);

    }
}

效果：