Android惯用控件之GridView使用BaseAdapter

    我们可以为GridView添加自定义的Adapter，首先看下用自定义Adapter的显示效果

在布局文件main.xml文件中定义一个GridView控件

<RelativeLayout 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"    tools:context=".MainActivity" >    <GridView        android:id="@+id/gridView"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:numColumns="4"        android:stretchMode="columnWidth" >    </GridView></RelativeLayout>

package com.example.gridviewadapterdemo;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;import android.widget.AdapterView.OnItemClickListener;public class MainActivity extends Activity {	private GridView gridView = null;	private int[] imageId = new int[] { R.drawable.img01, R.drawable.img02,			R.drawable.img03, R.drawable.img04, R.drawable.img05,			R.drawable.img06, R.drawable.img07, R.drawable.img08,			R.drawable.img09, R.drawable.img10, R.drawable.img11,			R.drawable.img12, }; // 定义并初始化保存图片id的数组	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		gridView = (GridView) findViewById(R.id.gridView);		GridViewAdapter gridViewAdapter = new GridViewAdapter();		gridView.setAdapter(gridViewAdapter);		// 为GridView设定监听器		gridView.setOnItemClickListener(new gridViewListener());	}	class gridViewListener implements OnItemClickListener {		@Override		public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,				long arg3) {			// TODO Auto-generated method stub			System.out.println("arg2 = " + arg2); // 打印出点击的位置		}	}	private class GridViewAdapter extends BaseAdapter {		@Override		public View getView(int position, View convertView, ViewGroup parent) {			ImageView imageview; // 声明ImageView的对象			if (convertView == null) {				imageview = new ImageView(MainActivity.this); // 实例化ImageView的对象				imageview.setScaleType(ImageView.ScaleType.CENTER_INSIDE); // 设置缩放方式				imageview.setPadding(5, 0, 5, 0); // 设置ImageView的内边距			} else {				imageview = (ImageView) convertView;			}			imageview.setImageResource(imageId[position]); // 为ImageView设置要显示的图片			return imageview; // 返回ImageView		}		/*		 * 功能：获得当前选项的ID		 * 		 * @see android.widget.Adapter#getItemId(int)		 */		@Override		public long getItemId(int position) {			//System.out.println("getItemId = " + position);			return position;		}		/*		 * 功能：获得当前选项		 * 		 * @see android.widget.Adapter#getItem(int)		 */		@Override		public Object getItem(int position) {			return position;		}		/*		 * 获得数量 		 * 		 * @see android.widget.Adapter#getCount()		 */		@Override		public int getCount() {			return imageId.length;		}	}}

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