this weird run time exception keep coming up - kotlin

Question

This is the runtime exception: "lateinit property name Session has not been initialized" that keeps coming up.
class GalasatyActivity : BaseActivity() {
private lateinit var binding: ActivityGalasatyBinding
private val list = ArrayList<Post>()
private lateinit var readingTypes: String
private lateinit var student :String
private lateinit var statue :String
private var sessionType by Delegates.notNull<Int>()
private lateinit var nameSession:String
private lateinit var mSharedPreferences: SharedPreferences
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityGalasatyBinding.inflate(layoutInflater)
setContentView(binding.root)
setUpActionBar()
setupGalasatyList()
mSharedPreferences = getSharedPreferences(Constants.PREFERENCE_NAME, Context.MODE_PRIVATE)
//nameSession = findViewById<TextView>(R.id.tv_galsa).toString()
readingTypes = findViewById<TextView>(R.id.tv_reading_type).toString()
student = findViewById<TextView>(R.id.tv_student).toString()
statue = findViewById<TextView>(R.id.tv_statue).toString()
sessionType = findViewById<TextView>(R.id.tv_session_type).toString().toInt()
nameSession = findViewById<TextView>(R.id.tv_galsa).toString()
}
private fun setUpActionBar(){
setSupportActionBar(binding.toolBarGalasaty)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
binding.toolBarGalasaty.setNavigationOnClickListener {
doubleBackToExit()
}
}
private fun setupGalasatyList(){
hideProgressBar()
//getGalasatDetails(name,readingTypes,student,statue,sessionType)
DataRetrofit.instance.getSessions(nameSession,readingTypes,student,statue,sessionType).enqueue(object :Callback<Post?>{
override fun onResponse(call: Call<Post?>, response: Response<Post?>) {
binding.rvGalasatyList.layoutManager = LinearLayoutManager(this#GalasatyActivity,LinearLayoutManager.VERTICAL,false)
binding.rvGalasatyList.setHasFixedSize(true)
val galsaAdapter = GalasatyItemListAdapter(this#GalasatyActivity, list)
binding.rvGalasatyList.adapter = galsaAdapter
galsaAdapter.setOnClickListener(object : GalasatyItemListAdapter.OnClickListener{
override fun onClick(position: Int, model: Post) {
startActivity(Intent(this#GalasatyActivity,GalsaActivity::class.java))
}
})
}
override fun onFailure(call: Call<Post?>, t: Throwable) {
Toast.makeText(this#GalasatyActivity, t.message, Toast.LENGTH_SHORT).show()
}
})
}
private fun getGalasatDetails(name:String, readingTypes: String, student:String, statement:String, sessionType:Int){
if (Constants.isInternetAvailable(this)){
val retrofit: retrofit2.Retrofit = retrofit2.Retrofit.Builder().baseUrl(Constants.BASE_URL)
.addConverterFactory(GsonConverterFactory.create()).build()
val service: DataAPI = retrofit.create(DataAPI::class.java)
val listCall: Call<Post> = service.getSessions(name,readingTypes,student,statement,sessionType)
showProgressDialog(resources.getString(R.string.please_wait))
listCall.enqueue(object :Callback<Post?> {
#RequiresApi(Build.VERSION_CODES.N)
override fun onResponse(call: Call<Post?>, response: Response<Post?>) {
if (response.isSuccessful){
hideProgressBar()
val galasatList: Post? = response.body()
val sessionResponseJsonString = Gson().toJson(galasatList)
val editor = mSharedPreferences.edit()
editor.putString(Constants.SESSIONS_RESPONSE_DATA, sessionResponseJsonString)
editor.apply()
setupUI()
Log.i("Response result","$galasatList")
}else{
when(response.code()){
400->{
Log.e("Error 400","Bad connection")
}404->{
Log.e("Error 404","Not found")
}else->{
Log.e("Error","Generic error")
}
}
}
}
override fun onFailure(call: Call<Post?>, t: Throwable) {
hideProgressBar()
Log.e("erorrr", t.message.toString())
}
})
}else{
Toast.makeText(this,"No internet connection", Toast.LENGTH_SHORT).show()
}
}
private fun setupUI(){
val galasatResponseJsonString = mSharedPreferences.getString(Constants.SESSIONS_RESPONSE_DATA,"")
if (!galasatResponseJsonString.isNullOrEmpty()) {
val galasatList = Gson().fromJson(galasatResponseJsonString, Post::class.java)
for (i in Post.toString()) {
readingTypes = galasatList.readingType
student = galasatList.student
statue = galasatList.student
nameSession = galasatList.name
}
}
}
}

Answer 1

You're initializing a view into a string which is outrightly wrong.
See, here you've declared a variable as lateinit var nameSession: String and then you're initializing it with a view as nameSession = findViewById<TextView>(R.id.tv_galsa).toString() , that too as String which actually doesn't make sense.
Second, the error is about nameSession which as I said earlier is used first in the line no. 64 - DataRetrofit.instance.getSessions(nameSession,..., so the code breaks at this very point and you think that it will work with others, just not this which is again not the case because your code is wrong.
See, There are two cases, Either you want to pass the text value of the TextView nameSession and others, or the view in the getSessions().
To passs the view, declare it as lateinit var nameSession: TextView, initialize it as nameSession = findViewById<TextView>(R.id.tv_galsa) and pass it as DataRetrofit.instance.getSessions(nameSession,...).
To pass the text value of the TextView, declare and initialize it exactly as my first point, just pass it as DataRetrofit.instance.getSessions(nameSession.text,...).
Do the 2nd point for others as well. You DON'T convert the view to String, you convert the value of the view to String, and to get the value, you use the .text property of the TextView as I've used in the 2nd point.(setText() and getText() in Java).
So, convert all your variables as Views, and then pass their value using the .text property. One more of doing it will be nameSession = binding.tv_galsa.text.