Offline support is a product decision: decide which jobs must remain possible and make the status of every saved change clear.
Decide what should work without a connection
Offline support does not have to mean that every feature works without the internet. Start with the tasks that users must be able to complete in poor coverage: reading an assigned job, drafting a report or reviewing recently loaded information.
Android’s architecture guidance describes an offline-first approach that serves critical functionality from a local data source. The application can update that data through network-backed synchronisation. This is a useful foundation for a mobile workflow that should remain responsive when connectivity changes.
Make pending work visible
Imagine a technician submitting a visit report in a basement. The app should explain whether the report is saved on the device, waiting to upload or accepted by the server. Those are different states, and each one changes what the user can safely do next.
Avoid a success message that only means a local write succeeded when the user expects the whole team to see the update. Instead, use a distinct pending state and offer a way to inspect unresolved uploads.
Decide what happens if the app is closed, the device restarts or the user signs out before synchronisation completes. These recovery paths are part of the feature, not edge cases to leave until launch.
Choose conflict rules deliberately
Two people may edit the same record while one of them is offline. A simple overwrite may be acceptable for a personal draft but inappropriate for a shared order or inventory count.
Our suggested approach is to classify data by consequence. Separate append-only events from editable fields. For a consequential conflict, show the competing versions or request a fresh server check rather than silently replacing someone’s work.
Test connection changes as a normal journey
Test transitions, not only a device that starts fully offline. Interrupt a save, restore the connection, repeat a tap and reopen the app. Check that a retry does not create a duplicate action.
- A draft remains readable after the app restarts.
- Pending changes have a clear status and a recovery action.
- Repeated uploads do not create duplicate records.
- A server rejection explains what the user needs to correct.
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