图片异步下载加载代码

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;
import android.widget.ImageView;

public class DrawableManager {

    private final Map<String, Drawable> drawableMap;

    public DrawableManager() {
        drawableMap = new HashMap<String, Drawable>();
    }

    public Drawable fatchDrawable(String urlString) {
        if (drawableMap.containsKey(urlString)) {
            return drawableMap.get(urlString);
        }
        try {
            InputStream is = fetch(urlString);
            Drawable drawable = Drawable.createFromStream(is, "src");
            drawableMap.put(urlString, drawable);
            return drawable;
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }

    }

    public void fetchDrawableOnThread(final String urlString,
            final ImageView imageView) {
        if (drawableMap.containsKey(urlString)) {
            imageView.setImageDrawable(drawableMap.get(urlString));
        }
        final Handler handler = new Handler() {

            @Override
            public void handleMessage(Message msg) {
                // TODO Auto-generated method stub
                imageView.setImageDrawable((Drawable) msg.obj);
            }
        };

        Thread thread = new Thread() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                Drawable drawable = fatchDrawable(urlString);
                Message msg = handler.obtainMessage(1, drawable);
                handler.sendMessage(msg);
            }
        };
        thread.start();
    }

    private InputStream fetch(String urlString) throws ClientProtocolException,
            IOException {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet request = new HttpGet(urlString);
        HttpResponse response = httpClient.execute(request);
        return response.getEntity().getContent();

    }
}

补充：移动开发 , Android ,

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