android-navigation-type-safe

Android Navigation Standards

Priority: P0 (CRITICAL)

Implementation Guidelines

Type-Safe Navigation

• Library: Navigation Compose 2.8.0+.
• Routes: Use @Serializable objects/classes instead of String routes.
• Arguments: No manual bundle parsing. Use .toRoute<T>().

Structure

• Graphs: Split large apps into nested navigation graphs (navigation extension functions).
• Hoisting: Hoist navigation events out of Screens. Composable screens should accept callbacks (onNavigateToX).

Anti-Patterns

• No String Routes: Use @Serializable typed objects/classes for destinations.
• No NavController in Composables: Hoist navigation events to screen-level callbacks.

References

• Route Definitions

Required route example

• For a product detail argument, define @Serializable data class ProductDetail(val productId: Long) and navigate with the typed destination; retrieve it with toRoute<ProductDetail>().

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

• Define ProductDetail(val productId