You’re welcome. This is indeed the only Activity code needed if you followed the Getting started guide, as it connects your widgets to your Algolia account:
// This creates a Searcher with your credentials, which can perform searches
searcher = Searcher.create(ALGOLIA_APP_ID, ALGOLIA_SEARCH_API_KEY, ALGOLIA_INDEX_NAME);
// This connects the Searcher to your Widgets for displaying results
// (e.g. populating Hits' list)
helper = new InstantSearchHelper(this, searcher);
// This triggers a search with empty query, sending all results to Widgets
Feel free to check the InstantSearch Examples repository, you’ll find several example apps demonstrating further how you can use the library!