Android读取assets目录下所有文件

package org.crazyit.image;import java.io.IOException;import java.io.InputStream;import android.app.Activity;import android.content.res.AssetManager;import android.graphics.BitmapFactory;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;/** * Description: * 
site: crazyit.org  * 
Copyright (C), 2001-2012, Yeeku.H.Lee * 
This program is protected by copyright laws. * 
Program Name: * 
Date: * @author  Yeeku.H.Lee kongyeeku@163.com * @version  1.0 */public class BitmapTest extends Activity{String[] images = null;AssetManager assets = null;int currentImg = 0;ImageView image;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);image = (ImageView)findViewById(R.id.image);try{assets = getAssets();//获取/assets/目录下所有文件images = assets.list("");}catch (IOException e){e.printStackTrace();}//获取bn按钮final Button next = (Button)findViewById(R.id.next);//为bn按钮绑定事件监听器，该监听器将会查看下一张图片next.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View sources){//如果发生数组越界if (currentImg >= images.length){currentImg = 0;}//找到下一个图片文件while (!images[currentImg].endsWith(".png")&& !images[currentImg].endsWith(".jpg")&& !images[currentImg].endsWith(".gif"));{currentImg++;//如果已发生数组越界if (currentImg >= images.length){currentImg = 0;}}InputStream assetFile = null;try{//打开指定资源对应的输入流assetFile = assets.open(images[currentImg++]);}catch (IOException e){e.printStackTrace();}BitmapDrawable bitmapDrawable = (BitmapDrawable) image.getDrawable();//如果图片还未回收，先强制回收该图片if (bitmapDrawable != null&& !bitmapDrawable.getBitmap().isRecycled())             //①{bitmapDrawable.getBitmap().recycle();}//改变ImageView显示的图片image.setImageBitmap(BitmapFactory.decodeStream(assetFile)); //②}});}}
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