Is possible to use the routing engine in react native on the client side (offline without server)?

[abdelhadidevv]

We need build an offline maps app with OpenStreetMap and with routing feature on offline mode. so we need to know it's possible to make this engine run without command line?

I am a React Native developer and i don't have any experience with C++.

[datendelphin]

I would have a look at osmand for offline maps and routing. I don't think anyone made the osrm server part run in javascript only if I understand your question correctly

[abdelhadidevv]

We've already taken a look at osmand the Android app. They have all the features we need, but we need to build this app with React Native, so we need to build a library that supports Android and iOS.

I tried to understand how they handle the offline routing, but I found the structure of the project too complex.

[danpat]

People have made OSRM run natively on Android and iOS, but it requires some pretty low-level C++ skills and an understanding of writing native code on those platforms. If you don't have any experience with C++, then it is not the first C++ project I would attempt.

The Valhalla routing project has also been built for Android/iOS - but it's similar in a way - you need to have reasonable C++ code and native platform skills to wire things up, it's not out-of-the-box.

Graphhopper is written in Java and may be easier to work with on Android, but I'm not sure how you'd fare on iOS.

The only "plug-and-play" options I know of are commercial systems, like Mapbox's Navigation SDK (disclaimer: I work for Mapbox). I'm not current on how easy they are to integrate with React Native though.

[abdelhadidevv]

Thanks for the advice, I don't have a problem learning C++, but I want to know if it's possible to run this routing engine on React Native (without a command line). We can't run command line in React Native.

I will take a look at Valhalla. I've actually already taken a look at Mapbox it's good, but we're looking for a free service.

[danpat]

Yes - you can link against the libosrm.so module that is generated as part of the build and call routing functions directly.

Take a look at the C++ example here:

https://github.com/Project-OSRM/osrm-backend/blob/master/example/example.cpp

which shows how to call the routing functions on the library interface without running a separate process. How to get from the C++ interface into something React can understand is beyond my experience, you're on your own with that.

[abdelhadidevv]

Thanks for that, I will try to make that work in React Native :)