harmonyos-app

HarmonyOS app development with ArkTS uses the Stage model for UIAbility lifecycle management and declarative ArkUI components. Set up a module with an AbilityStage, create UIAbility entries, wire ArkTS components with strict typing, and structure cross-device logic through modules and services. Stage model replaces the older FA model with improved resource management and multi-device support.

ArkTS enforces strict typing—no dynamic types allowed—and requires immutable state updates for reliable UI rendering. Components must be reusable and properly scoped within the Stage model lifecycle. Cross-device distribution demands atomic services and KV storage patterns; mutable shared state across devices breaks isolation guarantees.

Yes. HarmonyOS distributed design patterns enable cross-device data sharing and ability orchestration through Stage-based architecture. Use KV storage for synchronized state, atomic services for modular cross-device operations, and explicit ability routing to coordinate phone, tablet, watch, and TV instances.

ArkUI components in HarmonyOS are built with ArkTS strict typing and declared as reusable composites within modules. Leverage the Stage model's component lifecycle, immutable @State properties, and module boundaries to isolate component logic. Export components through barrel files for consistent cross-module imports.

The Stage model introduces UIAbility-based lifecycle management, atomic services, and multi-device orchestration—replacing the earlier FA model. Stage provides stricter resource scoping, better cross-device distribution support, and cleaner separation between UI and service logic through explicit module and ability boundaries.

HarmonyOS multi-device projects use shared ArkTS and ArkUI code with responsive layout patterns and device-specific resource qualification. The Stage model and atomic services enable single-codebase deployment across form factors; device-specific behavior is handled through responsive breakpoints and resource configuration, not separate implementations.