Ever shipped an Android app where the first tap on Login does nothing, then works on the second t...Ever shipped an Android app where the first tap on Login does nothing, then works on the second t...
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Ever shipped an Android app where the first tap on Login does nothing, then works on the second tap? 🤔
It's not random. It's a race condition in Room.
If you seed default data inside RoomDatabase.Callback.onCreate() by launching a coroutine, onCreate() returns before the insert finishes. The query that triggered database creation then runs too early and finds nothing. That's why it only happens on the very first launch.
Two fixes I cover in the article: âś… Call the insert directly with runBlocking inside onCreate(). Room already runs it on a background thread. âś… For complex or async seeding, warm up the database at startup and gate the UI until it's ready.
Have you hit this one before? #Android #Kotlin #Room #JetpackCompose

medium.com

Room’s “Lazy Initialization” Trap: Why the First Action Always Fails on a Fresh Install

If you’ve ever shipped an Android app that seeds a predefined user (or any default data) into Room on first launch, you may have run into…

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