AI BriefingAdopting StateFlow in Android Kotlin
Key point
Shares the experience of replacing LiveData with StateFlow in Android development to implement Clean Architecture.
Details
The previously used LiveData has the advantage of being lifecycle-aware for Android components, but it has the limitation of being dependent on the Android platform. Because of this, it is difficult to use in the platform-independent Domain Layer, and dependency issues can arise during modularization.
To solve this, StateFlow, an extended form of Kotlin Flow, was introduced. StateFlow has the following characteristics:
- It operates as a Hot Stream, always maintaining the latest state value and supporting multiple Collectors
- An initial value is required, and the latest value is always delivered at the point of subscription
- Unlike SharedFlow, it holds state, making it effective for exposing UI state
In actual implementation, the ViewModel updates state via MutableStateFlow, while the Activity/Fragment uses lifecycleScope and repeatOnLifeCycle to safely collect data in a lifecycle-aware manner.
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