Fully Understanding Dagger Hilt Migration from First Principles
summary
A step-by-step migration from Dagger/Dagger Android to Hilt, demonstrated with a sample repo of four buildable commits. Covers concrete code edits: removing component factories, turning ApplicationComponent into EntryPoints backed by SingletonComponent, creating an aggregator module and moving modules into it, switching scope annotations and annotating activities/fragments with @AndroidEntryPoint, and removing DispatchingAndroidInjector. Also explains handling UI test issues (Robolectric, FCM, services) by replacing @AndroidEntryPoint with explicit EntryPoint lookups and guarded fallbacks, plus the Gradle/plugin configuration required for Hilt’s bytecode transformation.
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chapters (14)
- 0:00Introduction
- 1:51Dagger fundamentals
- 4:18Dagger vs Dagger-Android
- 7:27Hilt approach
- 10:57Migration steps
- 11:59Component tree grafting
- 14:47Replacing scope annotations
- 15:49Migrating Activities
- 17:12Login migration
- 18:57Fragments migration
- 19:40Migration cleanup
- 20:01Common issues
- 24:13Hilt in UI testing
- 25:19Summary
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