Shared Preferences in Android

 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="28dp"
        android:text="Shared Preferences"
        android:textColor="@android:color/black"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/edit1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textview"
        android:layout_marginStart="20dp"
        android:layout_marginEnd="20dp"
        android:hint="Enter Name"
        android:padding="10dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edit2" />

    <EditText
        android:id="@+id/edit2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/edit1"
        android:layout_marginStart="20dp"
        android:layout_marginTop="48dp"
        android:layout_marginEnd="20dp"
        android:hint="Enter Number"
        android:inputType="number"
        android:padding="10dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textview" />

    <Button
        android:id="@+id/btnSubmit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Submit"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edit1" />

    <TextView
        android:id="@+id/txtname"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="4dp"
        android:textColor="@android:color/black"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.211"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txgage" />

    <TextView
        android:id="@+id/txgage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="40dp"
        android:textColor="@android:color/black"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.211"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnSubmit" />

 </androidx.constraintlayout.widget.ConstraintLayout>

 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import com.velodate.myapplication.databinding.ActivityMainActivityoneBinding

 class MainActivityone : AppCompatActivity() {
    private lateinit var mainBinding: ActivityMainActivityoneBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        mainBinding = ActivityMainActivityoneBinding.inflate(layoutInflater)
        setContentView(mainBinding.root)

        //Get name and age in pref data
        val sh = getSharedPreferences("MySharedPref", MODE_PRIVATE)
        val name = sh.getString("name", "")
        val age = sh.getInt("age", 0)
        
        // Setting the fetched data in the EditTexts
        mainBinding.txtname.setText(name)
        if (age != 0) {
            mainBinding.txgage.setText(age.toString())
        }
        mainBinding.btnSubmit.setOnClickListener {
            //save data in pref name and age
            val sharedPreferences = getSharedPreferences("MySharedPref", MODE_PRIVATE)
            val myEdit = sharedPreferences.edit()
            myEdit.putString("name", mainBinding.edit1.text.toString())
            myEdit.putInt("age", mainBinding.edit2.text.toString().toInt())
            myEdit.apply()
            //Get name and age in pref data
            val sh = getSharedPreferences("MySharedPref", MODE_PRIVATE)
            val s1 = sh.getString("name", "")
            val a = sh.getInt("age", 0)
            // Setting the fetched data in the EditTexts
            mainBinding.txtname.setText(s1)
            mainBinding.txgage.setText(a.toString())

         }
     }
 }