今天小研究了一下GridView,目的是为了实现 下面的效果(GridView多项选择):

首先,在布局文件添加GridView ,创建适配器的items...

具体的都在注释里边了,下面是 程序源码 片段,由于xml文件比较简单,故不在贴出.

MainActivity.java

package com.app.gridview;

import android.os.Bundle;

import android.app.Activity;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.GridView;

public class MainActivity extends Activity {

	static  MainActivity  instance;//实例

	GridView gridView1;//声明对象

	MyGridViewAdapter adapter;//声明适配器

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		instance =this;

		//获得组件

		gridView1  =(GridView) findViewById(R.id.gridView1);

		gridView1.setNumColumns(2);

		//获得适配器

		adapter  = new MyGridViewAdapter(instance);

		//设置适配器到组件

		gridView1.setAdapter(adapter);

		//添加监听

		gridView1.setOnItemClickListener(new OnItemClickListener() {

			@Override

			public void onItemClick(AdapterView<?> parent, View view,

					int position, long id) {

				//更改显示

				adapter.changeState(position);

			}

		});

	}

}

自定义适配器 MyGridViewAdapter.java

package com.app.gridview;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.graphics.drawable.LayerDrawable;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

public class MyGridViewAdapter extends BaseAdapter {

	Context context;

	boolean isCheck;// 选中

	Boolean boo[] = {false, false, false, false, false};

	int imgsid[] = {R.drawable.aa_badge_ad, R.drawable.aa_badge_award,

			R.drawable.aa_badge_exclusive, R.drawable.aa_badge_gift,

			R.drawable.aa_badge_new,};

	public MyGridViewAdapter(Context context) {

		this.context = context;

		isCheck = false;

	}

	@Override

	public int getCount() {

		return imgsid.length;

	}

	@Override

	public Object getItem(int position) {

		return imgsid[position];

	}

	@Override

	public long getItemId(int position) {

		return position;

	}

	@Override

	public View getView(int position, View convertView, ViewGroup parent) {

		ImageView imageView;

		if (convertView == null) {

			imageView = new ImageView(context);

			imageView.setLayoutParams(new GridView.LayoutParams(200, 200));// 设置ImageView对象布局

			imageView.setAdjustViewBounds(false);// 设置边界对齐

			imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);// 设置刻度的类型

			imageView.setPadding(8, 8, 8, 8);// 设置间距

		} else {

			imageView = (ImageView) convertView;

		}

		imageView.setImageDrawable(makeBmp(imgsid[position], boo[position]));

		// imageView.setImageResource(imgsid[position]);//为ImageView设置图片资源

		return imageView;

	}

	private LayerDrawable makeBmp(int id, boolean isChosen) {

		Bitmap bitmap = ((BitmapDrawable) context.getResources()

				.getDrawable(id)).getBitmap();

		// 根据isChosen来选取对勾的图片

		Bitmap seletedBmp;

		if (isChosen == true) {

			seletedBmp = BitmapFactory.decodeResource(context.getResources(),

					R.drawable.btncheck_yes);

		} else {

			seletedBmp = BitmapFactory.decodeResource(context.getResources(),

					R.drawable.btncheck_no);

		}

		// 使 Drawable叠加层（合成图片)

		Drawable[] array = new Drawable[2];

		array[0] = new BitmapDrawable(bitmap);

		array[1] = new BitmapDrawable(seletedBmp);

		// 层图形对象

		LayerDrawable mLayerDrawable = new LayerDrawable(array);// 参数为上面的Drawable数组

		/*

		 * Specify modifiers to the bounds for the drawable[index].索引号 left += l

		 * top += t; right -= r; bottom -= b;

		 */

		mLayerDrawable.setLayerInset(0, 0, 0, 0, 0); // 第一个参数0代表数组的第一个元素

		mLayerDrawable.setLayerInset(1, 88, 0, 0, 88);// 第一个参数1代表数组的第二个元素

		return mLayerDrawable; // 返回合成后的图

	}

	/*

	 * 被点击的时候调用,改变点击后的状态

	 */

	public void changeState(int position) {

		if (isCheck == false) {

			if (position < boo.length) {

				boo[position] = !boo[position];

				isCheck = !isCheck;

			}

		} else {

			if (position < boo.length) {

				boo[position] = !boo[position];

				isCheck = !isCheck;

			}

		}

		// 调用适配器的更新状态方法

		notifyDataSetChanged();

	}

}