Provide way guide(Android)

Open Source Routing Engine Mobile
1

How do i add directions such as turn left, turn right etc. on android using graphhopper?

2

If you mean the turn instructions you can get them from the routing result, see documentation for the API.

3

Hello, I’ve added the code here. But it crashes and no error message is displayed. Secondly, i’ve added it onPostExecute() but it throws an error of java.lang.IllegalArgumentException: To access instructions you need to enable creation before routing

protected PathWrapper doInBackground(Void… v) {
StopWatch sw = new StopWatch().start();
GHRequest req = new GHRequest(fromLat, fromLon, toLat, toLon).
setAlgorithm(DIJKSTRA_BI);
req.getHints().
put(Routing.INSTRUCTIONS, “false”);
GHResponse resp = hopper.route(req);
time = sw.stop().getSeconds();

            InstructionList il = resp.getBest().getInstructions();
            for(Instruction instruction : il) {
                logUser(instruction.getName());
            }

            return resp.getBest();
        }
4

You can enable the instructions by removing the:

req.getHints().put(Routing.INSTRUCTIONS, "false");

For any crash you can have a look at Android logcat for any exceptions.

5

Hi, it works! But how do i display turn left, turn right, etc.? I tried .getName but it only displays the street names

6

You can look at other getters in Instruction class, like getTurnDescription etc.

1 Like
7

thank you! At first, i was not sure on how to initialize the Translation but a few google search help.