我在一个android应用程序中使用google sheets api，并试图在一个单独的线程中获取凭据。
GoogleSheets是我创建的一个类，用于获取电子表格的凭据和单元格值
private lateinit var sheets: GoogleSheets是一个示例变量，我在类的开头声明了这个变量。

load.setOnClickListener(View.OnClickListener {
            Thread {
                sheets = GoogleSheets(requireContext(), "1fs1U9-LMmkmQbQ2Kn-rNVHIQwh6_frAbwaTp7MSyDIA")
            }.start()
            println(sheets)
            println(sheets.getValues("A1"))
        })

但是它告诉我sheets变量还没有初始化：

kotlin.UninitializedPropertyAccessException: lateinit property sheets has not been initialized

下面是完整的类：

import android.Manifest
import android.content.Intent
import android.content.pm.PackageManager
import android.net.Uri
import android.os.Build
import android.os.Bundle
import android.os.Environment
import android.provider.Settings
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.EditText
import androidx.activity.result.contract.ActivityResultContracts
import androidx.annotation.RequiresApi
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import androidx.fragment.app.Fragment
import com.example.frcscout22.GoogleSheets
import com.example.frcscout22.R

// TODO: AUTOMATICALLY SWITCH TO DATA TAB AFTER LOAD OR CREATE NEW

class Home: Fragment(R.layout.fragment_home) {
    private lateinit var sheets: GoogleSheets
    private val STORAGE_PERMISSION_CODE = 100

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

    @RequiresApi(Build.VERSION_CODES.P)
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val view: View = inflater.inflate(R.layout.fragment_home, container, false)

        val load = view.findViewById<Button>(R.id.button3)
        val new = view.findViewById<Button>(R.id.button4)
        val editText = view.findViewById<EditText>(R.id.editTextTextPersonName)

        if (!checkPermission()) {
            println("requested")
            requestPermission()
        }

        new.setOnClickListener(View.OnClickListener {
            val sheets = GoogleSheets(requireContext(),"1fs1U9-LMmkmQbQ2Kn-rNVHIQwh6_frAbwaTp7MSyDIA")
            sheets.setValues("A1", "this is a test", "USER_ENTERED")
            println(sheets.getValues("A1").values)
        })

        load.setOnClickListener(View.OnClickListener {
            Thread {
                sheets = GoogleSheets(requireContext(), "1fs1U9-LMmkmQbQ2Kn-rNVHIQwh6_frAbwaTp7MSyDIA")
            }.start()
            println(sheets)
            println(sheets.getValues("A1"))
        })
        return view
    }

    private fun requestPermission(){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R){
            //Android is 11(R) or above
            try {
                val intent = Intent()
                intent.action = Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION
                val uri = Uri.fromParts("package", requireActivity().packageName, "Home")
                intent.data = uri
                storageActivityResultLauncher.launch(intent)
            }
            catch (e: Exception){
                val intent = Intent()
                intent.action = Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION
                storageActivityResultLauncher.launch(intent)
            }
        }
        else{
            //Android is below 11(R)
            ActivityCompat.requestPermissions(requireActivity(),
                arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE),
                STORAGE_PERMISSION_CODE
            )
        }
    }

    private val storageActivityResultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()){
        //here we will handle the result of our intent
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R){
            //Android is 11(R) or above
            if (Environment.isExternalStorageManager()){
                //Manage External Storage Permission is granted
            }
        }
        else{
            //Android is below 11(R)
        }
    }

    private fun checkPermission(): Boolean{
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R){
            //Android is 11(R) or above
            Environment.isExternalStorageManager()
        }
        else{
            //Android is below 11(R)
            val write = ContextCompat.checkSelfPermission(requireContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE)
            val read = ContextCompat.checkSelfPermission(requireContext(), Manifest.permission.READ_EXTERNAL_STORAGE)
            write == PackageManager.PERMISSION_GRANTED && read == PackageManager.PERMISSION_GRANTED
        }
    }
}

我不知道为什么变量没有被初始化。它是否与它在线程中有关？我如何解决这个问题？谢谢！！