HERE SDK in 2025: Developer Insights & Best Practices

Background

As developers continue to build and scale applications using the HERE SDK, the Slack Developer Community has remained a critical space for real-world problem solving, especially as HERE SDKs evolved. alongside platform changes, deprecations, and new navigation capabilities.

In 2025, the community saw 150+ SDK-related interactions, with developers actively discussing navigation stability, rendering behaviour, offline maps, routing edge cases, and SDK migration. Many of these discussions surfaced insights and best practices that go beyond what’s currently documented making the community an essential companion for teams building with the HERE SDK.

This blog post highlights some of the most frequently asked HERE SDK questions in 2025, along with practical solutions shared by community members and HERE engineers. If you’re building with the HERE SDK for Flutter, Android, or iOS, these insights can save you significant development and debugging time.

1. Why does the map freeze or stop updating during navigation in Flutter apps?

This was one of the most recurring SDK topics in 2025, especially after Flutter and Android platform upgrades.

Key insights from the community:

• Freezes were often linked to Flutter version mismatches, hybrid composition or background/foreground lifecycle transitions

• In several cases, downgrading or aligning Flutter versions with supported SDK versions resolved the issue

• Alternatively, use an `AppLifecycleListener` as shown in the example apps or utilize the `MapViewLifecycleListener

Recommendation: Always verify Flutter and Android SDK compatibility and test lifecycle transitions extensively especially when upgrading Flutter or the HERE SDK. More information here.

2. How should offline maps be handled to avoid large updates and storage spikes?

Developers frequently asked how to monitor downloaded regions, estimate update sizes, and avoid unnecessary downloads.

Best practice shared in 2025:

• Query installed regions via MapDownloader

• Compare existing region sizes before triggering updates

• Prefer automatic updates; manual optional

Offline maps continue to be essential for navigation reliability, you can also check out intentional update management to avoid unexpected storage usage. More information here.

3. How do I detect and handle route deviations efficiently in turn-by-turn navigation?

With increased navigation usage, developers needed efficient ways to detect where a user deviated and how to recover smoothly.

Recommended approach:
To handle route deviations efficiently in turn-by-turn navigation, listen for RouteDeviation events from the Navigator or VisualNavigator. Use the deviation distance provided by the SDK and wait for multiple consecutive deviation events before taking action to avoid reacting to GPS noise. Apply a distance threshold to decide when intervention is needed. Once a deviation is confirmed, either guide the user back to the original route using returnToRoute() or calculate a new route from the current location, depending on how far and intentional the deviation is. More info here

4. Can route lines be customized beyond color in navigation mode?

Yes, and this became much easier in 2025. Developers confirmed that route line width can now be modified using: visualNavigator.setMeasureDependentWidth(...),more information here. This allows apps to:

• Improve route visibility

• Match brand styling& Adapt route appearance based on zoom level

5. How can I persist and reuse routes reliably across sessions?

Instead of saving only polylines, developers learned that:

• Saving the full route object is more reliable

• Routes can be restored using importRoute

• Traffic conditions may alter routes unless explicitly disabled

This approach avoids unnecessary recomputation and ensures consistency across sessions. More information here. You can also checkout the new serialize(_:)/deserialize(_:) methods which can be used in this case.

6. Does the HERE SDK provide a built-in voice assistant?

A recurring clarification in 2025:

• The HERE SDK does not include a built-in TTS engine

• It provides navigation strings only

• Developers must integrate platform-native TTS solutions

On Android, the standard TextToSpeech API remained the most common choice. More information here.

7. Can HERE SDK be combined with other HERE APIs (weather, fuel, etc.)?

Yes but not directly through the SDK. Several discussions clarified that:

• Weather, fuel prices, and similar data are accessed via REST API's

• SDKs focus on navigation, rendering, positioning & search and routing

• Hybrid SDK + REST architectures are common and supported

• External tile services (e.g., weather overlays) can be rendered on top of the map using custom raster tile layers

Takeaway: HERE SDK does not directly bundle weather or fuel services, but these can be integrated via REST APIs or rendered as custom raster tile layers on top of the map. More info here

8. How can I reliably detect invalid HERE SDK credentials at runtime when the map loads blank?

Several developers reported cases where:

• hereMapController.isValid is true.

• loadSceneForMapScheme() does not throw an error but the map renders as a blank screen with only the user location indicator visible.More info here.

Recommended: Make a search request with the SearchEngine. It will respond with AUTHENTICATION_FAILED.

9. Why does the map turn black after backgrounding and resuming the app (Android & Flutter)?

This became more common in 2025 with newer Android API levels and Flutter updates.

Root causes identified:

• Android: Improper handling of onPause()/onResume()

• Flutter: MapView lifecycle not reattached correctly

• GPU surface recreation issues on resume

Recommendation:

• Always forward lifecycle events to MapView

• Avoid recreating the map scene unnecessarily

• Test background/foreground transitions on real devices. Check out Skia documentation. More info for Flutter

  & native Android.
  

  ---

10. How can I store and restore routes without triggering unexpected rerouting?

Developers building long-running navigation or delivery apps wanted route persistence across sessions.

Key guidance:

• Save the Route object, not just the polyline using route.serialze(route).

• Restore using importRoute()

• Avoid departure or arrival times in the past

• Disable traffic if route shape must remain unchanged

This pattern became the most reliable way to restore navigation state. More info here.

11. Is it possible to unit test HERE SDK–dependent logic without initializing the full SDK?

As SDK usage matured, teams increasingly asked about testability.

What worked in practice:

• Abstract HERE SDK calls behind interfaces

• Mock route progress, location updates, and navigation events

• Avoid direct SDK dependencies in business logic

This approach enabled unit testing without requiring SDK initialization or emulators. More info on unit testing.

Conclusion:
From navigation stability and rendering quirks, to offline map strategies and lifecycle management, many of the most valuable insights emerged directly from developer conversations. If you’re building with the HERE SDK, the Slack Developer Community remains one of the best places to:

• Learn from real production scenarios

• Discover tips and best practices from the community

• Get fast, experience-backed answers

We encourage you to join the conversation, ask questions, and share your learnings! The community continues to be one of the strongest assets in the HERE developer ecosystem . And hey, did you know that all the above tips and more can be found in our Frequently Asked Questions? Check it out (Android/iOS/Flutter)!