Wsrtjtyk

i would like to retrieve data of manchester city team from :

API Link using OKHttp. I would like to display information such as club name, info logo etc. i tried to display it badge first.

here is my "Testgambar.kt" file

package com.eldarcreative.portalbola







import android.support.v7.app.AppCompatActivity



import android.os.Bundle

import android.support.v7.widget.LinearLayoutManager

import com.google.gson.GsonBuilder

import kotlinx.android.synthetic.main.activity_tes_gambar.*

import okhttp3.*

import java.io.IOException



class TesGambar : AppCompatActivity() {



    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_tes_gambar)



        detailrv.layoutManager= LinearLayoutManager(this)





        fetchJSONHome()





    }



    fun fetchJSONHome(){

        val urlhome = "https://www.thesportsdb.com/api/v1/json/1/lookupteam.php?id=133613"



        val request = Request.Builder().url(urlhome).build()



        val client = OkHttpClient()



        client.newCall(request).enqueue(object: Callback {

            override fun onResponse(call: Call, response: Response) {

                val body = response?.body()?.string()

                val gson = GsonBuilder().create()



                val DataTeam= gson.fromJson(body, Datatim::class.java)



                runOnUiThread {

                    detailrv.adapter = TeamAdapterZ(DataTeam)

                }

            }



            override fun onFailure(call: Call, e: IOException) {



            }



        })

    }



    }



    class Datatim(val loglog : List<DetailTim>)

Datatim.kt

data class DetailTim (

val idTeam:String?,

val strTeamLogo:String?,

val strTeamBadge:String?



)

TeamAdapterZ.kt

import android.support.v7.widget.RecyclerView

import android.view.LayoutInflater

import android.view.View

import android.view.ViewGroup

import com.squareup.picasso.Picasso

import kotlinx.android.synthetic.main.activity_detail.view.*



public  var logologo:String? = null



class TeamAdapterZ (val datatim :Datatim)  : RecyclerView.Adapter<TeamAdapterZ.TeamViewHolder>(){

    override fun onBindViewHolder(holder:TeamViewHolder, position: Int) {

        val timdata=datatim.loglog.get(position)

        holder.view.cadangantandang.text=timdata.idTeam



    }



    override fun getItemCount(): Int {



            return datatim.loglog.count() ;



    }



    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TeamAdapterZ.TeamViewHolder {

        val layoutInflater = LayoutInflater.from(parent.context)

        val cellforrow = layoutInflater.inflate(R.layout.activity_detail, parent, false)

        return TeamAdapterZ.TeamViewHolder(cellforrow)

    }



    class TeamViewHolder (val view: View):RecyclerView.ViewHolder(view){



    }

    }

my first test is to find out whether the data is retrieve or not, but it's return null value on logcat

java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.Collection.size()' on a null object reference
at com.eldarcreative.portalbola.TeamAdapterZ.getItemCount(TeamAdapterZ.kt:25)

anyone knew how to fix it?.