SharedPreferences - Save and Retrieve Data || Android Studio || Kotlin Tutorial

 In this post, we will learn how to save and retrieve data using SharedPreferences. We will save and then retrieve the username and password in our app. so let's begin with a few steps:

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Step 1: Create a new project with an empty activity

Step 2: Add the following XML code in the activity_main.xml file

<?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">


    <EditText
        android:id="@+id/Edittext"
        android:layout_width="300dp"
        android:layout_height="50dp"
        android:layout_marginTop="200dp"
        android:hint="username"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.495"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/edittext2"
        android:layout_width="300dp"
        android:layout_height="50dp"
        android:layout_marginTop="50dp"
        android:hint="password"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.495"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/Edittext" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="save"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.17"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/Edittext"
        app:layout_constraintVertical_bias="0.334" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="load"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.826"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/Edittext"
        app:layout_constraintVertical_bias="0.334" />


</androidx.constraintlayout.widget.ConstraintLayout>

Step 3: Add the following kotlin code in MainActivity.kt file

package com.example.myapplication

import android.content.Context
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)



        val save = findViewById<Button>(R.id.button)
        val load = findViewById<Button>(R.id.button2)
        val editText = findViewById<EditText>(R.id.Edittext)
        val editText2 = findViewById<EditText>(R.id.edittext2)
        val sharedPref = getSharedPreferences("myPref", MODE_PRIVATE)





        save.setOnClickListener {
            val editor =sharedPref.edit()
            val userName = editText.text.toString()
            val pass = editText2.text.toString()
            editor.apply {
                putString("user_name",userName)
                putString("passsword",pass)
                apply()
            }
        }


        


        load.setOnClickListener {
             val userName = sharedPref.getString("user_name",null)
                val pass = sharedPref.getString("passsword",null)
            editText.setText(userName)
            editText2.setText(pass)
            }

        }

    }

Step 4: Now Run App.

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