passing object between ListView and Webservices class

Question

I have a class A which is responsible for fetching data from web services in android and i have a class B which is responsible for creating and rendering List View in android

Now how can i populate data on List View once the data is fetched successfully. well i have following options but which one is better .. (if someone has anyother then i don't mind)

1) Create an intent of Class B and pass the data that need to be populated

2) Creating a static method int Class B which will accept the data as an argument and call setListAdapter

in class B i have used Holder Patter to create ListActivity. ( for reference List14.java in samples of Android )

Answer 1

Option #1 is not a good idea, IMHO.

Option #2 is impossible, since setListAdapter() is not a static method.

Class A's responsibility should be to fetch and store data from Web services. Here, "store" could be:

• A database
• A flat file
• Data cached in a custom Application object
• Data cached in a static data member

Class A can then notify class B to get the data from the store. Here, "notify" could be:

• a broadcast Intent
• using the PendingIntent from createPendingResult()
• some other PendingIntent
• a callback or listener object registered by Class B on Class A via bindService() and use of the subsequent local service API (assuming class A is a Service)