State management

Flow APIs Overview

Flow

• A type that can emit multiple values sequentially
• A terminal operator like collect is needed to trigger the flow to start listening for values

LiveData

• Observable data holder class
• Only updates app component observers that are in an active lifecycle state

StateFlow

• Observable data holder class

SharedFlow

• Configurable generalization of StateFlow

stateIn

• Converts a cold Flow into a hot StateFlow that is started in the given coroutine scope, sharing the most recently emitted value from a single running instance of the upstream flow with multiple downstream subscribers.

shareIn

• Converts a cold Flow into a hot SharedFlow that is started in the given coroutine scope, sharing emissions from a single running instance of the upstream flow with multiple downstream subscribers, and replaying a specified number of replay values to new subscribers.