empty-view | displays state of screen | Android library

I am having difficulty figuring out how user authentication/sign-in via FirebaseUI works in relation to the offline persistence of data from a Firestore database in Android.

I understand a user must be signed in in order to retrieve their documents from the database but what happens when the user is offline? How do I set up the flow of user and data checks in my app before displaying the user's list of documents, if any?

Please correct me if my understanding of the documentation (FirebaseUI and Firestore offline data) below is wrong.

So there are I think basically 3 pages a user would see:

1. A sign-up/sign-in page
2. An empty page when the user has no data in the database
3. A list of their documents

The first sign-up/sign-in page should be displayed for first time users and signed out users (whether the user has signed-out themselves or their sign-in token has expired). This is where FirebaseUI comes to the rescue. Can I check for both cases with just the getCurrentUser method? What does this method return when the user is offline? Have I missed this somewhere in the documentation on managing users?

The second empty page should be displayed for signed in users who don't have any data in the database (whether because they have just signed in for the first time or they have deleted all of their data). Do I use a get call to check for data? What does it return when there is no data or what listener do I have to use? Have I missed this somewhere in the documentation on getting data?

The third list page should be displayed for signed in users who have existing data or who have just created data/documents. This can be obtained with a query on a collection via a get call on that collection.

Finally, would you tie all this together from within one activity/fragment in the following way and order in onCreate/onCreateView?

First - Check for first time and signed out users: If yes then display (inflate) the first page (i.e. launch the FirebaseUI sign in intent activity). What happens after the user has signed up/signed in? Is the user brought back to the originating activity/fragment? How do I handle this?

Second - Check for data in the database: If there is no data then display an 'empty' page. If there is data then display the list of documents instead. It seems this can be handled by switching visibility between say a TextView with the text "Empty" and the RecyclerView in the same layout (see this SO post).

Please help!

In my app.component.html, I have my navigation bar and router-outlet. I want to hide navbar from the login page and show it after login.I used angular-2/jwt helper for checking whether a token is available in the local-storage and I hide the navbar from the login page based on the return value. but after login navbar is not showing Please help me.Thanks in advance

I had downloaded angular 4 template, In that they provide navigation elements in the app.component.html. i wanted to display only my login page as my default page and hide the navigation part.how to hide the navigation before login?

So the issue is that whenever I set my empty view for the recycler view, it always shows the empty view. I tried following some suggested solutions like the one in this url: FirebaseRecyclerAdapter with empty view, but the problem is that Firebase listeners are asynchronous and runs on its own thread. Before even setting the empty view, the fragment's onCreateView method already returns the view and so the empty view is not set appropriately. Are there any other way to implement the setting of empty view for FirebaseRecyclerAdapter?

Here is the snippet of the code: