Android SQLite interaction best practice

Is it OK to have SQLite interactions on UI thread ??
Is it a best practice to embed interactions with SQLite within a service(AsyncTask or IntentService) or should we use CursorLoader for SQLite??

1)If I use IntentService to return a list of user defined objects then how do I that. Should we use BroadcastReciever and put the list of objects in intent as ArrayList of Parcelable objects and send it back to UI thread.

2)If I have to use cursor Loaders then I need to write custom loader for SQLite by extending AsyncTaskLoader and override doInBackGround method where I add required code.

Please suggest me which is better approach as I am new to android and also share the code if anybody has it