How can i set sharedpreferences update value in dropdown menu - android-studio

Question

In my app I have a feature, the feature is localise. first, I am using an exposed dropdown menu(using textinputlayout) and this dropdown shows the language list when the user selects the language the app shows the text based on the user's selected language and I save user value in sharedpreference and it's working fine but the problem is when the user closes the app and reopen user can show their selected language text but the dropdown can't change based on sharedpreference value.
MainActivity.kt
class MainActivity : AppCompatActivity() {
companion object {
const val TAG = "MainActivity"
}
lateinit var lanList: List<String>
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
PrefHelper.init(this)
lanList = arrayListOf("EN","AR")
var la = PrefHelper.getValue("localise","")
Log.i("la", "onCreate: $la")
val adapter = MyAdapter(this, android.R.layout.simple_spinner_dropdown_item, lanList)
binding?.typesFilter?.setAdapter(adapter)
binding?.typesFilter.onItemClickListener =
AdapterView.OnItemClickListener { parent, view, position, id ->
val selectedLang: String = parent?.getItemAtPosition(position).toString()
when (selectedLang) {
"EN" -> {
binding.typesFilter.dismissDropDown()
lifecycleScope.launchWhenCreated {
delay(100)
setLocalise("en")
recreate()
}
}
"AR" -> {
binding.typesFilter.dismissDropDown()
lifecycleScope.launchWhenCreated {
delay(100)
setLocalise("ar")
recreate()
}
}
}
}
binding.typesFilter.post {
binding.typesFilter.dismissDropDown()
}
binding?.typesFilter.setDropDownBackgroundDrawable(
ResourcesCompat.getDrawable(
resources,
R.drawable.filter_spinner_dropdown_bg,
null
)
)
}
override fun attachBaseContext(newBase: Context?) {
PrefHelper.init(newBase!!)
super.attachBaseContext(LanguageChangeHelper.setLanguage(newBase!!,PrefHelper.getValue("localise","")!!))
}
private fun setLocalise(lan: String) {
var p:String = PrefHelper.setValue("localise",lan).toString()!!
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.textfield.TextInputLayout
android:id="#+id/typesFilterContainer"
style="#style/Widget.MaterialComponents.TextInputLayout.FilledBox.ExposedDropdownMenu"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_marginTop="32dp"
android:background="#drawable/filter_spinner_dropdown_bg"
app:boxBackgroundColor="#color/pastel_orange_light"
app:boxCornerRadiusBottomEnd="20dp"
app:boxCornerRadiusBottomStart="20dp"
app:boxCornerRadiusTopEnd="20dp"
app:boxCornerRadiusTopStart="20dp"
app:boxStrokeWidth="0dp"
app:boxStrokeWidthFocused="0dp"
app:endIconDrawable="#drawable/ic_baseline_keyboard_arrow_down_24"
app:endIconTint="#color/pastel_orange_txt_highlight"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<AutoCompleteTextView
android:id="#+id/typesFilter"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#null"
android:dropDownSelector="#drawable/filter_spinner_dropdown_bg"
android:ellipsize="end"
android:inputType="none"
android:maxLines="1"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:singleLine="true"
android:text="EN"
android:textAlignment="center"
android:textColor="#color/pastel_orange_txt_highlight"
tools:ignore="LabelFor">
<requestFocus />
</AutoCompleteTextView>
</com.google.android.material.textfield.TextInputLayout>
<TextView
android:id="#+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="16dp"
android:text="#string/title_text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/typesFilterContainer" />
<TextView
android:id="#+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:text="#string/body_text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:layout_marginEnd="16dp"
android:text="Button"
android:visibility="gone"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
MyAdapter.kt
class MyAdapter : ArrayAdapter<Any?> {
constructor(context: Context, resource: Int) : super(context, resource) {}
constructor(context: Context, resource: Int, textViewResourceId: Int) : super(
context,
resource,
textViewResourceId
) {
}
constructor(context: Context, resource: Int, objects: Array<Any?>) : super(
context,
resource,
objects
) {
}
constructor(
context: Context,
resource: Int,
textViewResourceId: Int,
objects: Array<Any?>
) : super(context, resource, textViewResourceId, objects) {
}
constructor(context: Context, resource: Int, objects: List<*>) : super(
context,
resource,
objects
) {
}
constructor(context: Context, resource: Int, textViewResourceId: Int, objects: List<*>) : super(
context,
resource,
textViewResourceId,
objects
) {
}
override fun getFilter(): Filter {
return object : Filter() {
override fun performFiltering(constraint: CharSequence?): FilterResults? {
return null
}
override fun publishResults(constraint: CharSequence?, results: FilterResults?) {}
}
}
}
PrefHelper.kt
object PrefHelper {
private lateinit var prefs: SharedPreferences
private const val PREF_NAME = "PrefHelper"
fun init(context: Context){
prefs = context.getSharedPreferences(PREF_NAME,Context.MODE_PRIVATE)
}
//For String
fun getValue(key:String,value:String):String?{
return prefs.getString(key, value)
}
fun setValue(key:String,value:String){
val prefEditor: SharedPreferences.Editor = prefs.edit()
with(prefEditor){
putString(key,value)
commit()
}
}
}
LanguageChangeHelper.kt
object LanguageChangeHelper {
fun setLanguage(context: Context,lan:String): Context? {
return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
updateResources(context,lan)
} else updateResourcesLegacy(context,lan)
}
#TargetApi(Build.VERSION_CODES.N)
private fun updateResources(context: Context, language: String): Context? {
val locale = Locale(language)
val configuration = context.resources.configuration
val localeList = LocaleList(locale)
LocaleList.setDefault(localeList)
configuration.setLocales(localeList)
return context.createConfigurationContext(configuration)
}
private fun updateResourcesLegacy(context: Context, language: String): Context? {
val locale = Locale(language)
Locale.setDefault(locale)
val resources = context.resources
val configuration = resources.configuration
configuration.locale = locale
resources.updateConfiguration(configuration, resources.displayMetrics)
return context
}
}
better understanding I also show my app
first time open the app
after change the language
when user reopen the app
how can i change user selected option based sharedpreferences?
Thank you