I have listview that is populated through CursorLoader. CursorLoader is created by LoaderManager.LoaderCallback's createLoader method. I have no problems with this. The problem is in that I want to start another task when listview population is completed and fill listviews with additional data. My current solution is to start a another loader inside onLoadFinished method.
Is this right solution or it can be done in more elegant and efficient way? Could you give some advice, because I don't have much experience in android development. Thanks in advance.
Loading from onLoadFinished will working without a problem. I did something similar in a pet project I had. I loaded data from my own ContentProvider and from there loaded contacts data from the phone's Contact ContentProvider. Each entry in my db could reference multiple contacts so I had to load my item before I knew which contact info to load. I chained the init/restart LoaderManager call to when I first received my item data in onLoadFinished. It works just fine and I used the contact data as a list afterwards. Granted I didn't use this approach to load data into a view inside an existing list view item. I used the data inside its own list in a detail view for my item. It should still work with what you want to do, but it can get messy appending data to the views and whatnot, especially since the view "lifecycle" is outside your control.
A better approach, IMO, would be to code a custom CursorAdapter that would use an AsyncTask or AsyncQueryHandler to fetch the extra data as the views are being created. Make sure to cache the data for subsequent use as the list scrolls. This second approach has the benefit of being independent of the external/secondary loader. It encapsulates all the logic required to display the data you need which includes loading the missing parts. It keeps the view data and display logic cohesive, safely tucked away inside a reusable module.