How to use Graphhopper in Android to get a road line on a map (OpenStreetMap)?

Parkash_Singh · September 14, 2016, 5:37pm

hi,

i want to use this API in android but not understand how to start any one give me idea how i can start my app building with graphhoper API and open street API.

devemux86 · September 14, 2016, 5:57pm

Besides the Routing via Java API guide, there is an Android sample which you can study.

Parkash_Singh · September 15, 2016, 5:18am

i know this sample . but i want step by step starting that help me to exact understand on use of graphhopper API

Parkash_Singh · September 15, 2016, 2:04pm

how create path between two point???

karussell · September 15, 2016, 2:52pm

Please avoid asking questions without investing a bit of your time, nobody here will do this for you and all here invest their spare-time so it should be used wisely

E .g. try to formulate specific questions when you took the code from the example and copied it into your code. What went wrong, which error message, or screenshot etc

Parkash_Singh · September 16, 2016, 1:43pm

Sorry sir but i really spend many time on open street map and graphopper api.But their is no tutorial provided to use graphhopper with OSM.

i made this application with the help of OSM.

But i want something else like first use of OSM with graphhopper .
2. Draw Route between two point with help of grapphopper.
3. A navigation of that route.
4. Distance between two point,Estimated Time Arrival,Remaining time also Directions.
5. how customize OSM map.

I dont know how use graphhoper api in android and what is its benefit
how get data from graphhoper and how use it.

what is use of this url?
“https://graphhopper.com/api/1/route?point=30.7086243%2C76.727869&point=30.7176455%2C76.7241826&vehicle=car&locale=en&points_encoded=false&key=b759c972-7efd-4cb1-a47f-c12abd018980”

and use of its json output ?

Please give me suggestion on these question and how i proceed. thank you in advance

and the sample you send earlier that never use graphhoper Api.

karussell · September 16, 2016, 1:58pm

Do you want online routing with a service hosted from someone else then you have a look here and into the provided Java clients. If you need offline routing then the sample above should help you. Still usage is very similar for both cases.

devemux86 · September 16, 2016, 4:19pm

GraphHopper Android sample is a complete example of how to use the Java API with offline graphs.
Best tutorial is often a working sample covering the library’s features.

It demonstrates the routing request between two points, how to read the answer, draw the calculated route and retrieve distance / time.
Most of the questions are answered in the sample code, you need to study it.

For the map it uses the Mapsforge offline vector map library.
So to customize the map, you can check Mapsforge forum.

Parkash_Singh · September 20, 2016, 12:19pm

Thank you sir for this sample i get much knowledge. but still this sample has many limitations that i face in it.

sir is their any way to search destination by town/city or postcode.this application uses x,y axis to get latitude and longitude.
As the vehicle travels along the route, the app should show and say directions when
approaching junctions and roundabouts etc how this will be happen ?

devemux86 · September 20, 2016, 1:03pm

The example shows library’s features, i.e. the routing.

Additional options like geocoding or directions need development by the user with e.g. OSM Nominatim, GraphHopper Geocoding API, Google Text-to-Speech, etc.

Mantj · October 17, 2016, 6:33am

Hi, I follow your suggestion in:

github.com

graphhopper/graphhopper/blob/master/docs/core/routing.md

# Routing via Java API

To use the following examples you need to specify the dependency in
your [Maven config](/README.md#maven) correctly.

To do routing in your Java code you'll need just a few lines of code:

```java
// create one GraphHopper instance
GraphHopper hopper = new GraphHopperOSM().forServer();
hopper.setDataReaderFile(osmFile);
// where to store graphhopper files?
hopper.setGraphHopperLocation(graphFolder);
hopper.setEncodingManager(new EncodingManager("car"));

// now this can take minutes if it imports or a few seconds for loading
// of course this is dependent on the area you import
hopper.importOrLoad();

// simple configuration of the request object, see the GraphHopperServlet classs for more possibilities.

This file has been truncated. show original

GraphHopper hopper = new GraphHopperOSM().forServer();
hopper.setOSMFile(osmFile);
hopper.setGraphHopperLocation(graphFolder);
hopper.setEncodingManager(new EncodingManager(“car”));
hopper.importOrLoad();

But it goes error(in Android) when it comes to:

hopper.importOrLoad();

here is my log:

10-17 14:28:31.861 32197-774/com.example.administrator.myapplication E/AndroidRuntime: java.lang.VerifyError: com/graphhopper/reader/OSMInputFile
10-17 14:28:31.861 32197-774/com.example.administrator.myapplication E/AndroidRuntime: at com.graphhopper.reader.OSMReader.preProcess(OSMReader.java:168)
10-17 14:28:31.861 32197-774/com.example.administrator.myapplication E/AndroidRuntime: at com.graphhopper.reader.OSMReader.readGraph(OSMReader.java:148)
10-17 14:28:31.861 32197-774/com.example.administrator.myapplication E/AndroidRuntime: at com.graphhopper.GraphHopper.importData(GraphHopper.java:759)
10-17 14:28:31.861 32197-774/com.example.administrator.myapplication E/AndroidRuntime: at com.graphhopper.GraphHopper.process(GraphHopper.java:725)
10-17 14:28:31.861 32197-774/com.example.administrator.myapplication E/AndroidRuntime: at com.graphhopper.GraphHopper.importOrLoad(GraphHopper.java:698)
10-17 14:28:31.861 32197-774/com.example.administrator.myapplication E/AndroidRuntime: at com.example.administrator.myapplication.MainActivity$6.run(MainActivity.java:628)

could you please tell me what I can do next?

jasmeet_sahni · June 30, 2017, 5:16pm

hello parkash sir i am also new to this field and also want to create an app using openstreetmap with graphhopper . i searched a lot about it but only get confused. can u tell me from i should start for this.
Thanks
Jasmeet

karussell · June 30, 2017, 7:03pm

@jasmeet_sahni Please do not hi-jack topics, instead create a new and show what you have done (like which steps from the docs) and what the problem is that you have.

Parkash_Singh · July 1, 2017, 6:44am

Hi jasmeet_sahni

Please clear your problem what exactly you want to do and what you done right now.

jasmeet_sahni · July 1, 2017, 9:35am

actually i want to create an android app which uses openstreetmap data and i want to calculate route between two areas.
Also want to show navigation and directions from one place to another with calculated time.
But i am new to this work can anyone suggest me something what can i do or from where i should start my work.
until now i have implemented basic graphhopper sample code but in this it is using europe cities how can i use other countries like india, china.

Thanks in advance