how can I get GeoJson data from a url in Kotlin

Question

I am a beginner in kotlin and I would like to have the information contained in a url:

in my case I have a list of url, each url contains information formatted in geojson and I would like to get this information. Does anyone have an idea of how I can do this?

here is an example of the url that can be found in my list :

https://database-geojsons-test.s3.amazonaws.com/COOPERATIVES/Maps%2520test/Exploitation/Alpha/Alpha.geojson

so you want info that is inside the geojson file and not in the url itself your intentions are not clear from the question — Rahul Rawat, Jul 07 '21 at 14:35
You are building it on android or is it a general kotlin project? — Rahul Rawat, Jul 07 '21 at 14:41
To read GeoJson from URL see https://stackoverflow.com/questions/49394844/kotlin-how-to-read-json-string-on-url; To parse GeoJson data from String use https://github.com/data2viz/geojson-kotlin/releases/tag/v0.6.0 — Михаил Нафталь, Jul 08 '21 at 08:27
It's not working, it's always go to the function onFailure(), but the url si valid — dja, Jul 20 '21 at 09:52

score 1 · Accepted Answer · answered Jul 28 '21 at 09:47

1

It's quite simple as I use Retrofit I created a method that will retrieve the json content

@GET
    suspend fun getGeoJsonData(@Url url: String) : String

and I could retrieve the content by calling this method for each json

answered Jul 28 '21 at 09:47

dja

53
6

score 1 · Answer 2 · answered Jul 29 '21 at 12:55

you can use Retrofit and add a Gson converterFactory. You can read more about it on the android developer web site.

Here is just an exemple:

private val BASE_URL : String = "http [your URL]"

val interceptor: HttpLoggingInterceptor = HttpLoggingInterceptor().apply {
        this.level = HttpLoggingInterceptor.Level.BODY
    }

val client: OkHttpClient = OkHttpClient.Builder().apply {
        this.addInterceptor(interceptor)
    }.build()

private val retrofit = Retrofit.Builder()
            .baseUrl(BASE_URL)
            .client(client)
            .addConverterFactory(GsonConverterFactory.create()) //Converters can be added to support other types in body
            .build()

I hope that works for you :)

how can I get GeoJson data from a url in Kotlin

2 Answers2