如果你在Android Market上发布了程序，怎么通过程序访问，查看程序的信息呢？谷歌大神为我们提供了--An open-source API for the Android Market，另外，也给Ruby和PHP都留了接口，当然了访问是需要Google帐户滴，更多信息请看考：

OK,废话少说，That's it！

Current progress¶

• You can browse market with any carrier or locale you want.
• Search for apps using keywords or package name.
• Retrieve an app info using an app ID.
• Retrieve comments using an app ID.
• Get PNG screenshots and icon

Requirement：

• A google account is required.
• Include androidmarketapi-X.Y.jar and protobuf-java-X.Y.Z.jar in your classpath ，下载地址：

需要把这两个JAR导入项目中，由于很好理解，代码就不加注释了 :-）

HowToSearchApps  ：

You can search by package using :

1. String query = "pname:<package>"; 

By developper name :

1. String query = "pub:<name>"; 

1. String query = "pname:com.luckyxmobile.timers4me";// 通过包名查找程序
2. MarketSession session = new MarketSession();  
3. session.login("your gmail account", "your password");  
4. AppsRequest appsRequest = AppsRequest.newBuilder().setQuery(query).setStartIndex(0).setEntriesCount(10).setWithExtendedInfo(true).build();  
5. session.append(appsRequest, new MarketSession.Callback<AppsResponse>() {  
6. @Override 
7. public void onResult(ResponseContext context, AppsResponse response) {  
8. TextView text = (TextView) findViewById(R.id.text);  
9. String id = response.getApp(0).getId();  
10. String creatorID = response.getApp(0).getCreatorId();  
11. String creator = response.getApp(0).getCreator();  
12. String packageName = response.getApp(0).getPackageName();  
13. String price = response.getApp(0).getPrice();  
14. String rating = response.getApp(0).getRating();  
15. int ratingCount = response.getApp(0).getRatingsCount();  
16. String title = response.getApp(0).getTitle();  
17. String version = response.getApp(0).getVersion();  
18. int versionCode = response.getApp(0).getVersionCode();  
19. int serializedSize = response.getApp(0).getSerializedSize();  
20. ExtendedInfo extendedInfo = response.getApp(0).getExtendedInfo();  
21. text.setText("id:" + id + "\nCreatorId:" + creatorID  
22. + "\nCreator:" + creator + "\nPackageName:"+ packageName + "\nPrice:" + price + "\nrating:"+ rating + "\nRatingCount:" + ratingCount + "\ntitle:" 
23. + title + "\nVersion:" + version + "\nversionCode:" 
24. + versionCode + "\nDownloadsCount:" 
25. + extendedInfo.getDownloadsCount()  
26. + "\nDownloadsCountText:"+extendedInfo.getDownloadsCountText()+ "\nInstallSize:" + extendedInfo.getInstallSize()  
27. + "\nSerializedSize:" + serializedSize+ "\nDecription:" + extendedInfo.getDescription()+ "\nContactEmail:" + extendedInfo.getContactEmail()+ "\nContactPhone:" + extendedInfo.getContactPhone()+ "\nContactWebsite:" 
28. + extendedInfo.getContactWebsite());  
29.             }  
30.         });  
31. session.flush();//发送并刷新 

 这是Timers4Me的运行结果：

HowToGetAppComments:

1. CommentsRequest commentsRequest = CommentsRequest.newBuilder().setAppId("7065399193137006744").setStartIndex(0).setEntriesCount(10).build();session.append(commentsRequest, new Callback<CommentsResponse>() {    
2. @Override public void onResult(ResponseContext context, CommentsResponse response) {        
3. System.out.println("Response : " + response);  
4. // response.getComments(0).getAuthorName()      
5. // response.getComments(0).getCreationTime()    
6. // ...   
7.     } });    
8. session.flush();   

HowToGetAppScreenshot   ：

1. GetImageRequest imgReq = GetImageRequest.newBuilder().setAppId("-7934792861962808905").setImageUsage(AppImageUsage.SCREENSHOT).setImageId("1").build();       
2. session.append(imgReq, new Callback<GetImageResponse>() {   
3. @Override public void onResult(ResponseContext context, GetImageResponse response) {      
4. try {                        
5. FileOutputStream fos = new FileOutputStream("icon.png");      
6. fos.write(response.getImageData().toByteArray());      
7. fos.close();                           
8. } catch(Exception ex) {      
9. ex.printStackTrace();     
10. }}});   
11. session.flush();  

以上只是抛砖引玉，更多精彩，只有动手才能看到，good luck！