How to Use checkBox to DarkMode in Android

Hello friends today we will learn about How to Use checkBox to DarkMode in Android.Today we see in many apps, we are seeing the use of dark theme, so today we will see how we will use dark theme in our app.

First of all we will do a project in our android studio or where we want to use it.

activity_main

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:layout_marginTop="130dp"

        android:text="checkBox"

        android:textColor="@color/purple_500"

        android:textSize="20sp"

        android:textStyle="bold" />

    <CheckBox

        android:id="@+id/checkBox"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:text="Night Mode" />

</LinearLayout>

MainActivity

package com.example.darkmode;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.view.View;

import android.widget.CheckBox;

import androidx.annotation.Nullable;

import androidx.appcompat.app.AppCompatActivity;

import androidx.appcompat.app.AppCompatDelegate;

public class MainActivity extends AppCompatActivity {

    private CheckBox checkBox;

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        getSupportActionBar().setBackgroundDrawable(getDrawable(R.color.purple_700));

        checkBox = findViewById(R.id.checkBox);

        SharedPreferences sharedPreferences = getSharedPreferences("check", MODE_PRIVATE);

        final SharedPreferences.Editor editor = sharedPreferences.edit();

        checkBox.setChecked(sharedPreferences.getBoolean("checkBox", false));

        final boolean isDarkMode = sharedPreferences.getBoolean("isDarkMode", false);

        if (isDarkMode) {

            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);

        } else {

            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);

        }

        checkBox.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                if (checkBox.isChecked()) {

                    if (isDarkMode) {

                        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);

                        editor.putBoolean("isDarkMode", false);

                        editor.apply();

                        editor.putBoolean("checkBox", true);

                        editor.apply();

                        checkBox.setChecked(true);

                    }

                } else {

                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);

                    editor.putBoolean("isDarkMode", true);

                    editor.apply();

                    editor.putBoolean("checkBox", false);

                    editor.apply();

                    checkBox.setChecked(false);

                }

            }

        });

    }

}

Thanks