Shared Preferences - Android Studio - Kotlin

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In this example, we will store string, int & boolean data into sharedpreferences on save button click. On view button click we will display sharedpreferences stored data into textview & Clear sharedpreferences stored data on clear button click. See the following example:

activity_main.xml

Add the following code in the activity_main.xml file.

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:orientation="vertical"
    android:layout_margin="15dp"
    tools:context=".MainActivity">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="SharedPreference"
            android:textSize="30dp"
            android:gravity="center"
            android:layout_marginTop="10dp"
            android:layout_marginBottom="30dp"/>

        <EditText
            android:id="@+id/edt_UserId"
            android:hint="Enter User Id"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:layout_margin="5dp"
            android:background="#E7E7E7"/>

        <EditText
            android:id="@+id/edt_Name"
            android:hint="Enter Name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:layout_margin="5dp"
            android:background="#E7E7E7"/>

        <EditText
            android:id="@+id/edt_Email"
            android:hint="Enter Email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:layout_margin="5dp"
            android:background="#E7E7E7"/>

        <LinearLayout
            android:layout_marginTop="30dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center">

                <Button
                    android:id="@+id/btn_Save"
                    android:layout_margin="5dp"
                    android:layout_weight="1"
                    android:text="Save"
                    android:textAllCaps="false"
                    android:background="@color/colorAccent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />

                <Button
                    android:id="@+id/btn_View"
                    android:layout_margin="5dp"
                    android:layout_weight="1"
                    android:textAllCaps="false"
                    android:text="View"
                    android:background="@color/colorAccent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />

                <Button
                    android:id="@+id/btn_Clear"
                    android:layout_margin="5dp"
                    android:layout_weight="1"
                    android:textAllCaps="false"
                    android:text="Clear"
                    android:background="@color/colorAccent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />

        </LinearLayout>

        <TextView
            android:id="@+id/txt_Display_Info"
            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="18dp"/>

</LinearLayout>
Create new SharedPreference.kt class and add following code:
SharedPreference.kt
package com.study.kotlinkatta

import android.content.Context
import android.content.SharedPreferences

class SharedPreference (val context: Context) {
    private val preference_Name = "Kotlinkatta"
    val shared_Pref: SharedPreferences = context.getSharedPreferences(preference_Name, Context.MODE_PRIVATE)

    /*Stored String Data*/
    fun save_String(key_name: String, text: String) {
        val editor: SharedPreferences.Editor = shared_Pref.edit()
        editor.putString(key_name, text)
        editor.commit()
    }

    fun getPreferenceString(key_name: String): String? {
        return shared_Pref.getString(key_name, null)
    }

    /*Stored Int Data*/
    fun save_Int(key_name: String, value: Int) {
        val editor: SharedPreferences.Editor = shared_Pref.edit()
        editor.putInt(key_name, value)
        editor.commit()
    }

    fun getPreferenceInt(key_name: String): Int {
        return shared_Pref.getInt(key_name, 0)
    }

    /*Stored Boolean Data*/
    fun save_Boolean(key_name: String, status: Boolean) {
        val editor: SharedPreferences.Editor = shared_Pref.edit()
        editor.putBoolean(key_name, status!!)
        editor.commit()
    }

    fun getPreferenceBoolean(key_name: String, defaultValue: Boolean): Boolean {
        return shared_Pref.getBoolean(key_name, defaultValue)
    }

    fun clearSharedPreference() {
        val editor: SharedPreferences.Editor = shared_Pref.edit()
        editor.clear()
        editor.commit()
    }

    fun removeValue(key_name: String) {
        val editor: SharedPreferences.Editor = shared_Pref.edit()
        editor.remove(key_name)
        editor.commit()
    }
}
MainActivity.kt
Add the following code in the MainActivity.kt class.
package com.study.kotlinkatta
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() {

    var sharedPreference:SharedPreference? = null
    lateinit var edt_UserId: EditText
    lateinit var edt_Name: EditText
    lateinit var edt_Email: EditText
    lateinit var btn_Save: Button
    lateinit var btn_View: Button
    lateinit var btn_Clear: Button
    lateinit var txt_Display_Info: TextView

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

        sharedPreference =SharedPreference(this)
        edt_UserId = findViewById(R.id.edt_UserId)
        edt_Name = findViewById(R.id.edt_Name)
        edt_Email = findViewById(R.id.edt_Email)
        btn_Save = findViewById(R.id.btn_Save)
        btn_View = findViewById(R.id.btn_View)
        btn_Clear = findViewById(R.id.btn_Clear)
        txt_Display_Info = findViewById(R.id.txt_Display_Info)

        btn_Save.setOnClickListener {
            val str_user_id = edt_UserId.text.toString()
            val str_name = edt_Name.text.toString()
            val str_email = edt_Email.text.toString()

            if(str_user_id.equals("") || str_name.equals("") || str_email.equals("")){
                Toast.makeText(this,"Please Enter Details.",Toast.LENGTH_SHORT).show()
            }else {
                sharedPreference!!.save_String("user_id",str_user_id)
                sharedPreference!!.save_String("name",str_name)
                sharedPreference!!.save_String("email",str_email)
                Toast.makeText(this,"Data Saved Successfully.",Toast.LENGTH_SHORT).show()
                txt_Display_Info.setText("")
            }
        }

        btn_View.setOnClickListener {
            val user_id = sharedPreference!!.getPreferenceString("user_id")
            val name = sharedPreference!!.getPreferenceString("name")
            val email = sharedPreference!!.getPreferenceString("email")
            if(user_id == null || name == null || email == null){
                Toast.makeText(this,"No Data Available.",Toast.LENGTH_SHORT).show()
                txt_Display_Info.setText("")
            }else {
                txt_Display_Info.setText("Info:-" + "\nUser Id:" + user_id + "\nName: " + name + "\nEmail: " + email)
            }
        }

        btn_Clear.setOnClickListener {
            sharedPreference!!.clearSharedPreference()
            Toast.makeText(this,"Data Clear Successfully.",Toast.LENGTH_SHORT).show()
            txt_Display_Info.setText("")
        }
    }
}
Output:

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