Adding Firebase Authentication to a Jetpack Compose app

Part two of the Make It So Android development series explains how to build login and sign-up flows with Jetpack Compose, Firebase Authentication, Hilt, ViewModels, and a service layer. The app starts users in an anonymous Firebase session so they can create and manage tasks without registering, then lets them link that existing account to an email-and-password credential from the settings screen, preserving their data rather than creating a second account. It outlines adding Firebase configuration and Authentication dependencies, keeping Activities and composables separate from business logic, and using ViewModel-managed UI state to synchronize text fields and trigger Compose recomposition as users enter credentials. Authentication operations are encapsulated in an AccountService that creates anonymous sessions, signs users in, and links accounts through Firebase callbacks, while successful account changes update the settings UI to replace sign-in options with sign-out and account-deletion controls. The next installment will address Crashlytics, snackbars, and code-reuse improvements, while noting that newer versions of the sample use Kotlin Coroutines and Flow instead of callbacks.

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