无法从微调下拉菜单中选择项目

如何解决无法从微调下拉菜单中选择项目

我正在尝试实现一个下拉菜单，用于在片段中选择状态。我正在使用一个 API，它从 json 数组中给出“state_id”和“state_name”，我将其存储在一个数组中，该数组的类型已定义为 StateModel 数据类。问题是微调器显示了所有状态名称，但是当我单击状态时，它没有出现在 setSelection 中，也没有显示为 Toast 消息。

片段类：

import android.graphics.Color
import android.os.Bundle
import android.util.Log
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.AdapterView
import android.widget.ArrayAdapter
import android.widget.SpinnerAdapter
import android.widget.Toast
import androidx.core.view.get
import com.android.volley.Request
import com.android.volley.toolBox.JsonObjectRequest
import com.android.volley.toolBox.Volley
import com.iam18.dose.databinding.FragmentdistrictSearchBinding
import org.json.JSONException

class districtSearchFragment : Fragment() {

    private var _binding: FragmentdistrictSearchBinding? = null
    private val binding get() = _binding!!

    private var stateList = ArrayList<StateModel>()


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        arguments?.let {
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
    ): View {
        _binding =  FragmentdistrictSearchBinding.inflate(inflater,container,false)
        return binding.root
    }

    companion object {
        @JvmStatic
        fun newInstance() =
            districtSearchFragment().apply {
                arguments = Bundle().apply {

                }
            }
    }

    override fun onViewCreated(view: View,savedInstanceState: Bundle?) {
        super.onViewCreated(view,savedInstanceState)
        getStateList()

        binding.stateSelect.adapter = ArrayAdapter(requireContext(),R.layout.support_simple_spinner_dropdown_item,stateList)

        binding.stateSelect.onItemSelectedListener = object :
            AdapterView.OnItemSelectedListener {
            override fun onItemSelected(parent: AdapterView<*>,view: View,position: Int,id: Long) {
                val item = parent.getItemAtPosition(position).toString()
                Toast.makeText(activity,item,Toast.LENGTH_LONG).show()
                binding.stateSelect.setSelection(position)
            }

            override fun onnothingSelected(parent: AdapterView<*>) {
                // write code to perform some action
            }
        }
    }


    private fun getStateList(){
        val url = "https://cdn-api.co-vin.in/api/v2/admin/location/states"
        val queue = Volley.newRequestQueue(activity)
        val request = JsonObjectRequest(Request.Method.GET,url,null,{ response ->
            Log.e("request","Success response is $response")
            try {
                val stateArray = response.getJSONArray("states")
                for (i in 0 until stateArray.length()) {
                    val stateObj = stateArray.getJSONObject(i)
                    val stateId = stateObj.getInt("state_id")
                    val stateName = stateObj.getString("state_name")
                    val state = StateModel(stateId,stateName)
                    stateList.add(state)
                }
            } catch (e: JSONException) {
                e.printstacktrace()
            }
        },{ error ->
            Log.e("Error","Response is $error")
            Toast.makeText(activity,"Failed to get response",Toast.LENGTH_SHORT).show()
        })
        queue.add(request)
    }

}

StateModel 数据类：

data class StateModel(
    val stateId: Int,val stateName: String
){
    override fun toString(): String {
        return stateName
    }
}

片段 XML：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".districtSearchFragment">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Select State"
            android:textSize="22sp"/>


        <Spinner
            android:id="@+id/stateSelect"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:spinnerMode="dialog" />

    </LinearLayout>

</FrameLayout>

使用的 API：https://cdn-api.co-vin.in/api/v2/admin/location/states

谁能帮我从下拉列表中选择州？另外，我想在从下拉列表中选择状态后获取 state_id 以进行进一步的工作。