Shared Preference in Android Kotlin

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>
    <LinearLayout 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=".Login"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Regitsration"
            />

        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="email"
            android:id="@+id/email"
            android:textColorHint="@color/black"
            android:textColor="@color/design_default_color_error"
            android:textAllCaps="true"
            android:textSize="20sp"
            android:textStyle="italic"
            android:layout_margin="5dp"
            android:padding="5dp"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="password"
            android:id="@+id/password"
            android:textColorHint="@color/black"
            android:textColor="@color/design_default_color_error"
            android:textAllCaps="true"
            android:textSize="20sp"
            android:textStyle="italic"
            android:layout_margin="5dp"
            android:padding="5dp"/>

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Login"
            android:id="@+id/login"
            android:layout_margin="5dp"
            android:padding="5dp"/>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="New User Register here"
            android:id="@+id/newuser"
            android:textStyle="bold"
            android:textColor="@color/black"
            android:textSize="25sp"
            android:layout_margin="10dp"
            android:padding="10dp"/>

    </LinearLayout>
</layout>

MainActivity.kt

package com.androindian.sampleproject

import android.content.Intent
import android.content.SharedPreferences
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.databinding.DataBindingUtil
import com.androindian.sampleproject.databinding.ActivityLoginBinding


class Login : AppCompatActivity() {

    var binding: ActivityLoginBinding? = null
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_login)


        

        binding?.login?.setOnClickListener {
            
                var s1 = binding?.email?.text.toString().trim()
                var s2 = binding?.password?.text.toString().trim()

     
                            //adding data to shared preferences
      var sharedPreferences = getSharedPreferences("Login", MODE_PRIVATE)
                            var editor = sharedPreferences.edit()
                            editor.putString("email", s1)
                            editor.putString("password", s2)
                            editor.commit()

                   var intent = Intent(this@Login, HomePage::class.java)
                            startActivity(intent)
                            finish()
                
            }


        }
    }

Homepage Activity.kt

package com.androindian.sampleproject

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.databinding.DataBindingUtil
import com.androindian.sampleproject.databinding.ActivityHomePageBinding

class HomePage : AppCompatActivity() {

    var binding:ActivityHomePageBinding?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding=DataBindingUtil.setContentView(this,R.layout.activity_home_page)

        var sharedPreferences=getSharedPreferences("Login", MODE_PRIVATE)

        var s1=sharedPreferences.getString("email",null)
        var s2=sharedPreferences.getString("password",null)

        binding?.logindata?.text=s1+s2

        binding?.logout?.setOnClickListener {
            var editor=sharedPreferences.edit()
            editor.clear()
           // editor.remove()
            editor.apply();
            var intent= Intent(this@HomePage,Login::class.java)
            startActivity(intent)
        }

    }
}

activity_home_page.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>
<LinearLayout 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=".HomePage"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/logindata"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="logut"
        android:id="@+id/logout"/>

</LinearLayout>
</layout>