package cn.wangmeng.test;import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;public class AsyncImageLoader {private HashMap<String, SoftReference<Drawable>> imageCache;public AsyncImageLoader() {imageCache = new HashMap<String, SoftReference<Drawable>>();}public Drawable loadDrawable(final String imageUrl, final ImageCallback imageCallback) {if (imageCache.containsKey(imageUrl)) {SoftReference<Drawable> softReference = imageCache.get(imageUrl);Drawable drawable = softReference.get();if (drawable != null) {return drawable;}}final Handler handler = new Handler() {public void handleMessage(Message message) {imageCallback.imageLoaded((Drawable) message.obj, imageUrl);}};new Thread() {@Overridepublic 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 url) {URL m;InputStream i = null;try {m = new URL(url);i = (InputStream) m.getContent();} catch (MalformedURLException e1) {e1.printStackTrace();} catch (IOException e) {e.printStackTrace();}Drawable d = Drawable.createFromStream(i, "src");return d;}public interface ImageCallback {public void imageLoaded(Drawable imageDrawable, String imageUrl);}}

package cn.wangmeng.test;public class ImageAndText {private String imageUrl;private String text;public ImageAndText(String imageUrl, String text) {this.imageUrl = imageUrl;this.text = text;}public String getImageUrl() {return imageUrl;}public String getText() {return text;}
}

package cn.wangmeng.test;import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;public class ViewCache {private View baseView;private TextView textView;private ImageView imageView;public ViewCache(View baseView) {this.baseView = baseView;}public TextView getTextView() {if (textView == null) {textView = (TextView) baseView.findViewById(R.id.text);}return textView;}public ImageView getImageView() {if (imageView == null) {imageView = (ImageView) baseView.findViewById(R.id.image);}return imageView;}}

package cn.wangmeng.test;import java.util.List;import cn.wangmeng.test.AsyncImageLoader.ImageCallback;import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;public class ImageAndTextListAdapter extends ArrayAdapter<ImageAndText> {private ListView listView;private AsyncImageLoader asyncImageLoader;public ImageAndTextListAdapter(Activity activity, List<ImageAndText> imageAndTexts, ListView listView) {super(activity, 0, imageAndTexts);this.listView = listView;asyncImageLoader = new AsyncImageLoader();}public View getView(int position, View convertView, ViewGroup parent) {Activity activity = (Activity) getContext();// Inflate the views from XMLView rowView = convertView;ViewCache viewCache;if (rowView == null) {LayoutInflater inflater = activity.getLayoutInflater();rowView = inflater.inflate(R.layout.image_and_text_row, null);viewCache = new ViewCache(rowView);rowView.setTag(viewCache);} else {viewCache = (ViewCache) rowView.getTag();}ImageAndText imageAndText = getItem(position);// Load the image and set it on the ImageViewString imageUrl = imageAndText.getImageUrl();ImageView imageView = viewCache.getImageView();imageView.setTag(imageUrl);Drawable cachedImage = asyncImageLoader.loadDrawable(imageUrl, new ImageCallback() {public void imageLoaded(Drawable imageDrawable, String imageUrl) {ImageView imageViewByTag = (ImageView) listView.findViewWithTag(imageUrl);if (imageViewByTag != null) {imageViewByTag.setImageDrawable(imageDrawable);}}});if (cachedImage == null) {imageView.setImageResource(R.drawable.default_image);}else{imageView.setImageDrawable(cachedImage);}// Set the text on the TextViewTextView textView = viewCache.getTextView();textView.setText(imageAndText.getText());return rowView;}}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="fill_parent"android:layout_height="wrap_content"><ImageView android:id="@+id/image"android:layout_width="wrap_content"android:layout_height="wrap_content"/><TextView android:id="@+id/text"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout>