android中异步加载图片.doc

packagecom.down;

importjava.io.IOException;
importjava.io.InputStream;
importjava.lang.ref.SoftReference;
importjava.net.MalformedURLException;
importjava.net.URL;
importjava.util.HashMap;

importandroid.app.Activity;
importandroid.graphics.drawable.Drawable;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.view.View;
importandroid.widget.ImageView;

//importcom.down.AsyncImageLoader.ImageCallback;

//异步加载
publicclassLazyLoadImageActivityextendsActivity{

AsyncImageLoaderasyncImageLoader;
StringimageUrl;
Callbackimgcallback;
Drawabledrawable;
android.widget.ImageViewimageView1;
android.widget.ImageViewimageView2;
android.widget.ImageViewimageView3;
AsyncImageLoaderloder;
Stringpath="http://192.168.1.66:8080/downPicService/DownPicServlet";
Stringimgpath;
Stringstr;
HashMap<String,SoftReference<Drawable>>hashmap;

publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
hashmap=newHashMap<String,SoftReference<Drawable>>();
imageView1=(android.widget.ImageView)this.findViewById(R.id.image1);
imageView2=(android.widget.ImageView)this.findViewById(R.id.image2);
imageView3=(android.widget.ImageView)this.findViewById(R.id.image3);

}

publicvoidbtn1(Viewv){
imgpath=receive(path);

loadImage(imgpath,R.id.image1);

}

publicvoidbtn2(Viewv){
imgpath=receive(path);

loadImage(imgpath,R.id.image2);
}

publicvoidbtn3(Viewv){
imgpath=receive(path);
loadImage(imgpath,R.id.image3);
}

//从服务端得到图片地址url
publicvoidloadImage(Stringurl,intid){
loder=newAsyncImageLoader();
ImageViewimageView=(ImageView)this.findViewById(id);
callback=newCallbackimg(imageView);

Drawabledrawable=loder.loadDrawable(url);

if(drawable!=null){
imageView.setImageDrawable(drawable);
}
}

publicStringreceive(Stringpath){

try{
//服务器Url对象
java.net.URLurl=newjava.net.URL(path);
java.net.HttpURLConnectionhttpConnection=(java.net.HttpURLCo