seniorAndroid
What is Dependency Injection (Hilt) in Android?
Updated Feb 20, 2026
Short answer
Dependency Injection (DI) is a design pattern where dependencies are provided externally, and Hilt is a modern Android library that simplifies DI.
Deep explanation
🔹 What Problem DI Solves
Without DI:
- Classes create their own dependencies
- Leads to tight coupling and poor testability
With DI:
- Dependencies are injected → loose coupling
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🔹 Hilt in Android
- Built on top of Dagger
- Automatically provides dependencies
- Reduces boilerplate
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🔹 Key Concepts
- @Inject → request dependency
- @Module → define how to provide
- @HiltAndroidApp → entry point
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🔹 System-Level Insight…
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