异步 加载 图片

引用：http://www.oschina.net/code/snippet_163910_6086

[代码] AsyncImageLoader.java

01	package cn.com.mzba.service;

02

03	import java.io.InputStream;

04	import java.lang.ref.SoftReference;

05	import java.net.URL;

06	import java.util.HashMap;

07

08	import android.graphics.drawable.Drawable;

09	import android.os.Handler;

10	import android.os.Message;

11	import android.widget.ImageView;

12

/**

13	* 实现图片的异步载入显示

14	* @author kandanle

15

*

16

*/

17	public class AsyncImageLoader {

18

19

/**

20	* 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。

21

*/

22	private HashMap<String, SoftReference<Drawable>> imageCache;

23

24	public AsyncImageLoader(){

25	imageCache = new HashMap<String, SoftReference<Drawable>>();

26

}

27

28	public Drawable loadDrawable(final String imageUrl,final ImageView imageView,finalImageCallback imagecallback){

29	if(imageCache.containsKey(imageUrl)){

30	//从缓存中读取人人

31	SoftReference<Drawable> softReference = imageCache.get(imageUrl);

32	Drawable drawable = softReference.get();

33	if(drawable != null){

34	return drawable;

35

}

36

}

37	final Handler handler = new Handler(){

38

@Override

39	public void handleMessage(Message msg) {

40	super.handleMessage(msg);

41	imagecallback.imageLoaded((Drawable)msg.obj, imageView, imageUrl);

42

}

43

};

44	new Thread(){

45	public void run() {

46	Drawable drawable = loadImageFromUrl(imageUrl);

47	imageCache.put(imageUrl, new SoftReference<Drawable>(drawable));

48	Message message = handler.obtainMessage(0, drawable);

49	handler.sendMessage(message);

50

}

51	}.start();

52

53	return null;

54

}

55

56	public static Drawable loadImageFromUrl(String urlPath){

57

URL url;

58	InputStream is = null;

59

try{

60	url = new URL(urlPath);

61	is = (InputStream)url.getContent();

62	}catch(Exception e){

63	e.printStackTrace();

64

}

65	Drawable drawable = Drawable.createFromStream(is, "src");

66	return drawable;

67

}

68

69

}

[代码] ImageCallback.java

view source

print?

01	package cn.com.mzba.service;

02

03	import android.graphics.drawable.Drawable;

04	import android.widget.ImageView;

05

06	public interface ImageCallback {

07	public void imageLoaded(Drawable imageDrawable,ImageView imageView, String imageUrl);

08

}

09

10	Drawable drawable = asyncImageLoader.loadDrawable(weiboInfo.getUserIcon(), viewUserIcon,new ImageCallback() {

11

@Override

12	public void imageLoaded(Drawable imageDrawable, ImageView imageView,String imageUrl) {

13	imageView.setImageDrawable(imageDrawable);

14

}

15

});

16	if(drawable == null){

17	viewUserIcon.setImageResource(R.drawable.portrait);

18

}else{

19	viewUserIcon.setImageDrawable(drawable);

20

}