I have a ListFragment that uses an IntentService to make a network request and a local
BroadcastReceiver to get results back. I'm wondering if I'm using the fragment's lifecycle
events properly:

1. I start the service in onActivityCreated().
2. I register the receiver in onResume().
3. I unregister the receiver in onPause().

I'm trying to implement infinite scrolling for a recycler view. 
Here's where I've taken inspiration for writing my custom scroll listener- https://gist.github.com/rogerhu/17aca6ad4dbdb3fa5892#file-endlessrecyclerviewscrolllistener-java 

The API I'm hitting gives back response in the form of 5 objects, every time offset is changed. 

I'm struggling with setting the Threshold value, especially for accomodating cases such as total count of response being less than 5.

Aah.Ok. So the use case here is to implement pagination. And the solution that came to my mind was infinte scrolling.

The main screen of the app displays a list of contacts. The list of contacts is returned
from the entwork. When the user adds or deletes a contact, the list needs to be updated
from the network, but that's the only time.

I am trying to work out a design to meet the following requirement:

When the app starts, it needs to start polling for Bluetooth input,
and continue polling as long as the app runs (across different activities).

Here is the design I'm thinking of:
1. Use an IntentService to handle reading the Bluetooth messages.
2. In the IntentService, use a LinkedBlockingQueue to manage worker threads
to do the reading.
3. In the IntentService, use an endless for loop to add Runnables to
the LinkedBlockingQueue. Each Runnable blocks until it reads one message.
4. Use a LocalBroadcastManager to transmit received messages to activities,
as appropriate.

Is this reasonable?

I am writing an app with TreeView, with the data taken from database at the moment. I have a base adapter implementing ListAdapter and a mainAdapter extending the base adapter. 
For unit testing these custom adapters, 
1)	Should I test the base adapter and the main adapter individually or do I only test the mainAdapter? 
2)	Which class should my unit test case derive from? Should it be AndroidTestCase or something else? 
3)	I assume for the unit testing of the adapter, I can skip the database, but use some static data. Am I right?
4)	Is it enough if I test the public methods in the adapter class(s)?