DIREKT Android State Management¶

Model¶

Unidirectional data flow:

• user intent;
• ViewModel;
• use case/repository;
• immutable UI state;
• one-time effect only for navigation/system operations.

UI state¶

State must explicitly represent:

• initial/loading;
• data;
• empty;
• refreshing;
• stale/offline;
• recoverable failure;
• permission blocked;
• unauthorized/session expired;
• submitting with duplicate-action prevention.

Do not encode state as unrelated booleans that allow impossible combinations.

Events¶

User actions are functions/intents. One-time effects use a controlled channel/flow and survive/reconcile process loss where business-critical.

Source of truth¶

• backend: trust, permissions, payment, publication;
• Room: cached public data, own draft/queue;
• DataStore: preferences;
• ViewModel: transient presentation.

Time and IDs¶

Inject clock and ID generator for testing. Display local time but store/transport UTC.

Error mapping¶

Network/database/domain errors map to typed user-safe states with correlation reference. Compose never parses raw exception text.