How to save state of Switch in android

Hello friend today we will learn about How to save state of Switch in android.Today we use switch in many ways in our app like to change dark mode or theme.

activity_main

<?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:gravity="center_horizontal"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        android:text="Switch"
        android:textColor="@color/purple_500"
        android:textSize="20sp"
        android:textStyle="bold" />

    <androidx.appcompat.widget.SwitchCompat
        android:id="@+id/switch1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        tools:layout_editor_absoluteY="197dp" />

</LinearLayout>

MainActivity

package com.example.darkmode;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.SwitchCompat;

public class MainActivity  extends AppCompatActivity {
SwitchCompat switchCompat;
Button btn;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn=findViewById(R.id.secondActivity);
        switchCompat=findViewById(R.id.switch1);
        SharedPreferences sharedPreferences = getSharedPreferences("share", MODE_PRIVATE);
        final SharedPreferences.Editor editor = sharedPreferences.edit();
        switchCompat.setChecked(sharedPreferences.getBoolean("isOpen", true));
        switchCompat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (switchCompat.isChecked()) {

                        editor.putBoolean("isOpen", true);
                        editor.apply();
                        switchCompat.setChecked(true);
                    Toast.makeText(SecondActivity.this, "Switch Open ...", Toast.LENGTH_SHORT).show();


                } else {
                    editor.putBoolean("isOpen", false);
                    editor.apply();
                    switchCompat.setChecked(false);
                    Toast.makeText(SecondActivity.this, "Switch Close ...", Toast.LENGTH_SHORT).show();

                }
            }
        });
       
    }
}