[代码] AsyncImageLoader.java
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package cn.com.mzba.service;
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import java.io.InputStream;
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import java.lang.ref.SoftReference;
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import java.net.URL;
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import java.util.HashMap;
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import android.graphics.drawable.Drawable;
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import android.os.Handler;
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import android.os.Message;
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import android.widget.ImageView;
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/**
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* 实现图片的异步载入显示
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* @author kandanle
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*
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*/
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public class AsyncImageLoader {
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/**
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* 软引用对象，在响应内存需要时，由垃圾回收器决定是否清除此对象。软引用对象最常用于实现内存敏感的缓存。
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*/
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private HashMap<String, SoftReference<Drawable>> imageCache;
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public AsyncImageLoader(){
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imageCache = new HashMap<String, SoftReference<Drawable>>();
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}
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public Drawable loadDrawable(final String imageUrl,final ImageView imageView,finalImageCallback imagecallback){
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if(imageCache.containsKey(imageUrl)){
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//从缓存中读取人人
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SoftReference<Drawable> softReference = imageCache.get(imageUrl);
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Drawable drawable = softReference.get();
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if(drawable != null){
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return drawable;
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}
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}
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final Handler handler = new Handler(){
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@Override
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public void handleMessage(Message msg) {
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super.handleMessage(msg);
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imagecallback.imageLoaded((Drawable)msg.obj, imageView, imageUrl);
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}
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};
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new Thread(){
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public void run() {
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Drawable drawable = loadImageFromUrl(imageUrl);
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imageCache.put(imageUrl, new SoftReference<Drawable>(drawable));
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Message message = handler.obtainMessage(0, drawable);
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handler.sendMessage(message);
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}
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}.start();
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return null;
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}
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public static Drawable loadImageFromUrl(String urlPath){
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URL url;
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InputStream is = null;
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try{
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url = new URL(urlPath);
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is = (InputStream)url.getContent();
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}catch(Exception e){
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e.printStackTrace();
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}
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Drawable drawable = Drawable.createFromStream(is, "src");
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return drawable;
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}
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}
[代码] ImageCallback.java
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package cn.com.mzba.service;
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import android.graphics.drawable.Drawable;
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import android.widget.ImageView;
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public interface ImageCallback {
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public void imageLoaded(Drawable imageDrawable,ImageView imageView, String imageUrl);
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}
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Drawable drawable = asyncImageLoader.loadDrawable(weiboInfo.getUserIcon(), viewUserIcon,new ImageCallback() {
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@Override
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public void imageLoaded(Drawable imageDrawable, ImageView imageView,String imageUrl) {
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imageView.setImageDrawable(imageDrawable);
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}
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});
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if(drawable == null){
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viewUserIcon.setImageResource(R.drawable.portrait);
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}else{
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viewUserIcon.setImageDrawable(drawable);
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}
