使用Bitmap遍历Assets目录下图片

布局文件：

<?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" >        <Button         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/btn"        android:text="change img"/>    <ImageView         android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/img"/></LinearLayout>

java代码：

package com.example.android_test;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;public class AssetTest extends Activity {Button button;ImageView image;AssetManager manager=null;String[] images=null;int currentImg=0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.asset_layout);button=(Button) findViewById(R.id.btn);image=(ImageView) findViewById(R.id.img);try {//获取资源manager=getAssets();//获取该目录下所有文件images=manager.list("");for (int i = 0; i < images.length; i++) {System.out.println(images[i]);}} catch (IOException e) {e.printStackTrace();}button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {for (;;) {System.out.println("当前文件："+images[currentImg]+currentImg);//遍历文件为以后缀为".jpg"的文件if (images[currentImg].endsWith(".jpg")) {if (currentImg>=images.length) {currentImg=0;}InputStream in=null;try {//打开一个输入流in=manager.open(images[currentImg]);} catch (IOException e) {e.printStackTrace();}BitmapDrawable bitmapDrawable=(BitmapDrawable) image.getDrawable();//如果图片还未回收，强制回收if (bitmapDrawable!=null && !bitmapDrawable.getBitmap().isRecycled()) {System.out.println("bitmapDrawable!=null:"+(bitmapDrawable!=null)+"..."+"!bitmapDrawable.getBitmap().isRecycled():"+(!bitmapDrawable.getBitmap().isRecycled()));bitmapDrawable.getBitmap().recycle();}else {System.out.println("空的...");}image.setImageBitmap(BitmapFactory.decodeStream(in));currentImg++;break;}else {currentImg++;}if (currentImg>=images.length) {currentImg=0;}}}});}}

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