How to get data from JsonObject and set as Array on RecyclerView in Kotlin?

Question

I'm working on a project that was previously done by another developer. I continue to call API for the project. I've followed his way. But, I get stuck when I want to retrieve JsonArray and show it into RecyclerView. How I can to get the data from JSONArray.

Interface:

interface TripService {
    @FormUrlEncoded
    @POST("driver/getAvailableTripList")
    fun availableTripList(@Field("page") page : String): Call<JsonObject>
}

TripServiceHandler:

class TripServiceHandler {
    private var instance: TripService? = null
    // Singleton instance to access through the application

    init {
        if(instance == null) {
            instance = TripFactory().createJourney(TripService::class.java)
        }
    }


    // Method for Driver Balance Service
    fun availableTripList(page: String, listener: ServerCallbackListener) =
            this.instance?.let {this.instance!!.availableTripList(page).enqueue(RetrofitCallBackHandler.getHandler(listener)) 
}

Fragment:

private fun getAvailableTrip(){
    showLoading()
    TripServiceHandler().availableTripList("1", availableTripHandler)
}

private var availableTripHandler: ServerCallbackListener = object : ServerCallbackListener {
    override fun onSuccess(baseResponse: JsonObject?) {
        hideLoading()
        val data = baseResponse!!.getAsJsonObject(AppConstants.KEY_DATA)

    }

    override fun onFailure(message: String?) {
        showMessageBar(message, SnackBarUtility.MessageType.ERROR)
    }

}

Data Model:

class Trip : Serializable {

    @SerializedName("tid")
    var tripId: String? = null

    @SerializedName("max_passengers")
    var maxPass: String? = null

    @SerializedName("driver_revenue")
    var priceTrip: String? = null

    @SerializedName("origin_coordinate")
    var originCoordinate: List<Coordinate>? = null

    @SerializedName("destination_coordinate")
    var destCoordinate: List<Coordinate>? = null
}

the jsonArray

"rows": [
            {
                "tid": "44551",
                "did": null,
                "status": 1,
                "leaving_time": "1547093186",
                "max_passengers": 12,
                "total_revenue": 0,
                "driver_revenue": 0,
                "origin_coordinate": {
                    "x": 1.43762623,
                    "y": 103.80153311
                },
                "destination_coordinate": {
                    "x": 1.29481854,
                    "y": 103.78735487
                },
                "total_requests": 12,
                "destination_geom": "0101000020E610000048F0284063F25940854F5F1901BFF43F",
                "origin_geom": "0101000020E61000002AB6CC40C7F25940032A19ECF7E4F63F",
                "stops": [
                    {
                        "sid": "46969",
                        "count": "4",
                        "order_seq": 1,
                        "mode": 0,
                        "name": "Woodlands Ave 4",
                        "description": "Blk 532",
                        "coordinate": {
                            "x": 1.43059181782,
                            "y": 103.792699721
                        },
                        "eta_time": "1547093186",
                        "leaving_time": "1547093366"
                    },

What is the response of this api "driver/getAvailableTripList" ? — Mahmoud Elshamy, Jan 02 '19 at 07:22
have u tried to print out your data when you processed an json object type value — DemiDust, Jan 02 '19 at 07:41
what is the log? it might help in finding your issue @Mavisa9 — DemiDust, Jan 02 '19 at 08:14
the log is the JsonArray of the api. i already my Question and put the data on it @DemiDust — Mavisa9, Jan 02 '19 at 08:24
try this, it might help https://stackoverflow.com/questions/40103987/parse-json-android-convert-jsonobject — DemiDust, Jan 02 '19 at 08:32
or this https://stackoverflow.com/questions/6079505/converting-json-string-to-java-object — DemiDust, Jan 02 '19 at 08:36
Hi @DemiDust i've tried that. but i still confuse. can you help me? — Mavisa9, Jan 02 '19 at 21:36
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/186079/discussion-between-mavisa9-and-demidust). — Mavisa9, Jan 03 '19 at 04:22

score 1 · Answer 1 · answered Jan 03 '19 at 03:27

As I have seen, your data should be a JSONobject type value already and since you are using serialized name i assume you are using Gson library for it.

First, make another model beforehand to contain your List (since it passed in rows)

data class TripList:Serializeable{
    @("rows")
    myList:List<Trip> = ArrayList()
}

Then, you can try this

val tripList = gson.fromJson(data, TripList::class.java)

Your tripList will then be TripList type of class, access your list with tripList.myList. Hope it will work for your solution

How to get data from JsonObject and set as Array on RecyclerView in Kotlin?

1 Answers1