Upgrading to FirebaseUI 3.0

No breaking changes

• Adapter initialization - in previous versions the adapter classes (FirebaseRecyclerAdapter, FirebaseListAdapter, etc) had multiple constructor overloads. In 3.x, each adapter has a single constructor that takes an Options object like FirebaseRecyclerOptions. These options objects can be constructed via their respective builders. For more information, see database/README.md.
• View logic - adapter classes no longer automatically create View or ViewHolder objects as required by their parent adapter classes. These methods are left to the developer, see the sample app for how to implement onCreateViewHolder() and other required methods.
• Adapter lifecycle - in previous versions the adapters began listening immediately upon instantiation and had a cleanup() call to stop listening. In 3.x you must explicitly call startListening() and stopListening() or pass a LifecycleOwner to the options builder.
• Errors and event types - errors in the adapters are now exposed via the onError() method. Data changes are exposed through onChildChanged() and onDataChanged().
• Indexed adapters - the indexed adapters have been removed. To use indexed data, use the setIndexedQuery() method when building adapter options.
• Observable snapshot arrays - ObservableSnapshotArray<T> and related classes previously implemented List<DataSnapshot>. They now implement List<T> for simpler iteration over model objects.

New module firebase-ui-firestore. See firestore/README.md for more information.

• Glide 4.0 - the underlying Glide dependency was upgraded to version 4.1.x. This new version of Glide changes how custom loaders (like FirebaseImageLoader) are added. Rather than passing a FirebaseImageLoader to each Glide invocation, you must create a Glide app module and register the loader there. For more information see storage/README.md. For comprehensive documentation on upgrading your app to Glide 4.x see the official migration guide.