Molecule: Using Compose for Presentation Logic
summary
Molecule turns Compose’s compiler plugin into a presenter builder so presentation logic runs as Compose code but without Compose UI dependencies. It exposes launchMolecule API returning a StateFlow, uses Compose primitives like mutableStateOf, remember and launchedEffect to cancel/restart work, and requires a recomposition clock (choose recomposition clock: context or immediate). Tests run with CashApp’s Turbine and immediate clock. Key behaviors: combines streams with ordinary Kotlin control flow and yields one emission per frame, matching the Android UI dispatcher.
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chapters (11)
- 0:00Molecule and Compose intro
- 2:25What Molecule lets us write
- 3:52Reactive programming on Android
- 9:35Flow and suspend limits
- 10:38Compose for presentation logic
- 15:53Why Molecule is needed
- 16:58Using Molecule in projects
- 19:54Recomposition clocks
- 21:40Building a search screen
- 23:24Testing Molecule presenters
- 24:25Key takeaways
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