android 异步加载图片，,AsyncImageLo

android 异步加载图片，,AsyncImageLo

AsyncImageLoader.java

package cn.com.mzba.service;import java.io.InputStream;import java.lang.ref.SoftReference;import java.net.URL;import java.util.HashMap;import android.graphics.drawable.Drawable;import android.os.Handler;import android.os.Message;import android.widget.ImageView;/** * 实现图片的异步载入显示 * @author kandanle * */public class AsyncImageLoader {    /**     * 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。     */    private HashMap<String, SoftReference<Drawable>> imageCache;    public AsyncImageLoader(){        imageCache = new HashMap<String, SoftReference<Drawable>>();    }    public Drawable loadDrawable(final String imageUrl,final ImageView imageView,final ImageCallback imagecallback){        if(imageCache.containsKey(imageUrl)){            //从缓存中读取人人            SoftReference<Drawable> softReference = imageCache.get(imageUrl);            Drawable drawable = softReference.get();            if(drawable != null){                return drawable;            }        }        final Handler handler = new Handler(){            @Override            public void handleMessage(Message msg) {                super.handleMessage(msg);                imagecallback.imageLoaded((Drawable)msg.obj, imageView, imageUrl);            }        };        new Thread(){            public void run() {                Drawable drawable = loadImageFromUrl(imageUrl);                imageCache.put(imageUrl, new SoftReference<Drawable>(drawable));                Message message = handler.obtainMessage(0, drawable);                handler.sendMessage(message);            }        }.start();        return null;    }    public static Drawable loadImageFromUrl(String urlPath){        URL url;        InputStream is = null;        try{            url = new URL(urlPath);            is = (InputStream)url.getContent();        }catch(Exception e){            e.printStackTrace();        }        Drawable drawable = Drawable.createFromStream(is, "src");        return drawable;    }}

ImageCallback.java

package cn.com.mzba.service;import android.graphics.drawable.Drawable;import android.widget.ImageView;public interface ImageCallback {    public void imageLoaded(Drawable imageDrawable,ImageView imageView, String imageUrl);}Drawable drawable = asyncImageLoader.loadDrawable(weiboInfo.getUserIcon(), viewUserIcon, new ImageCallback() {    @Override    public void imageLoaded(Drawable imageDrawable, ImageView imageView,String imageUrl) {    imageView.setImageDrawable(imageDrawable);        }});if(drawable == null){    viewUserIcon.setImageResource(R.drawable.portrait);}else{    viewUserIcon.setImageDrawable(drawable);}