SharedPrefrences.kt

activity_shared_pref.xml

<?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=".splash.SharedPrefActivity">

    <EditText
        android:id="@+id/et_password"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Enter aa password"
        app:layout_constraintBottom_toTopOf="@+id/et_email"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.417"
        app:layout_constraintStart_toStartOf="parent" />

    <EditText
        android:id="@+id/et_email"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="20dp"
        android:layout_marginTop="192dp"
        android:ems="10"
        android:hint="Enter a email"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/et_dob"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="20dp"
        android:layout_marginTop="12dp"
        android:ems="10"
        android:hint="Enter a dob"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/et_email" />

    <Button
        android:id="@+id/b_save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="12dp"
        android:text="Save"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.061"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/et_dob" />

    <Button
        android:id="@+id/b_clear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="196dp"
        android:layout_marginTop="12dp"
        android:text="Clear"
        app:layout_constraintStart_toEndOf="@+id/b_save"
        app:layout_constraintTop_toBottomOf="@+id/et_dob" />

</androidx.constraintlayout.widget.ConstraintLayout>

SharedPrefActivity.kt

package com.akhteakh.akhteakh.splash

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.akhteakh.akhteakh.databinding.ActivitySharedPrefBinding
import com.akhteakh.akhteakh.splash.figures.CubeActivity

class SharedPrefActivity : AppCompatActivity() {

    private lateinit var binding: ActivitySharedPrefBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivitySharedPrefBinding.inflate(layoutInflater)
        setContentView(binding.root)

        getValues()
        setValuesToViews()

        binding.bSave.setOnClickListener {
            val email = binding.etEmail.text.toString()
            val dob = binding.etDob.text.toString()
            val pass = binding.etPassword.text.toString()

            SharedPrefHelper.saveEmail(this, email)
            SharedPrefHelper.saveDob(this, dob)
            SharedPrefHelper.savePassword(this, pass)

        }

        binding.bClear.setOnClickListener {

            SharedPrefHelper.clearEmail(this)
            SharedPrefHelper.clearDob(this)
            SharedPrefHelper.clearPassword(this)

            binding.etEmail.setText("")
            binding.etDob.setText("")
            binding.etPassword.setText("")

        }

    }

    private fun getValues() {
        val email = SharedPrefHelper.getEmail(this)
        val dob = SharedPrefHelper.getDob(this)
        val pass = SharedPrefHelper.getPassword(this)

        if (email != null && dob != null &&  pass != null) {
            if (email.isNotEmpty() && dob.isNotEmpty()) {
                val intent = Intent(this, CubeActivity::class.java)
                startActivity(intent)
                finish()
            }
        }
    }

    private fun setValuesToViews() {
        val email = SharedPrefHelper.getEmail(this)
        val dob = SharedPrefHelper.getDob(this)
        val pass = SharedPrefHelper.getPassword(this)

        binding.etEmail.setText(email)
        binding.etDob.setText(dob)
        binding.etPassword.setText(pass)

    }
}

SharedPrefHelper.kt

package com.akhteakh.akhteakh.splash

import android.content.Context
import android.preference.PreferenceManager

object SharedPrefHelper {

    fun saveEmail(context: Context, email: String) {
        PreferenceManager.getDefaultSharedPreferences(
            context
        )
            .edit()
            .putString("EMAIL", email)
            .apply()
    }

    fun savePassword(context: Context, password: String){
        PreferenceManager.getDefaultSharedPreferences(
            context
        )
            .edit()
            .putString("PASSWORD", password)
            .apply()
    }
    
    fun saveDob(context: Context, dob: String) {
        PreferenceManager.getDefaultSharedPreferences(context)
            .edit()
            .putString("DOB", dob)
            .apply()
    }

 
    fun getEmail(context: Context): String? {
        return PreferenceManager.getDefaultSharedPreferences(
            context
        ).getString("EMAIL", "")
    }
    
    fun getPassword(context: Context): String? {
        return PreferenceManager.getDefaultSharedPreferences(
            context
        ).getString("PASSWORD", "")
    }

    fun getDob(context: Context): String? {
        return PreferenceManager.getDefaultSharedPreferences(context)
            .getString("DOB", "")
    }

    fun clearEmail(context: Context) {
        PreferenceManager.getDefaultSharedPreferences(context)
            .edit()
            .remove("EMAIL").apply()
    }

    fun clearDob(context: Context) {
        PreferenceManager.getDefaultSharedPreferences(context)
            .edit()
            .remove("DOB").apply()
    }

    fun clearPassword(context: Context) {
        PreferenceManager.getDefaultSharedPreferences(context)
            .edit()
            .remove("PASSWORD").apply()
    }

}