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package com.dm.tutorialdaynight3

import android.content.Context
import android.content.SharedPreferences            //Importazione della Classe SharedPreferences
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.RadioButton
import android.widget.TextView
import androidx.appcompat.app.AppCompatDelegate     //Importazione della Classe AppCompactDelegate

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val appSettingPrefs: SharedPreferences = getSharedPreferences("AppSettingPrefs", Context.MODE_PRIVATE)
val sharedPrefsEdit: SharedPreferences.Editor = appSettingPrefs.edit()
val isNightMode = appSettingPrefs.getInt("NightMode", -1)
/*MODE_NIGHT_FOLLOW_SYSTEM = -1
* MODE_NIGHT_AUTO = 0 (deprecated)
* MODE_NIGHT_NO = 1
* MODE_NIGHT_YES = 2
* MODE_NIGHT_AUTO_BATTERY = 3*/

when (isNightMode) {

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val mode = AppCompatDelegate.getDefaultNightMode()
sharedPrefsEdit.putInt("NightMode", mode)
sharedPrefsEdit.apply()

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package com.dm.tutorialdaynight2

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.RadioButton
import androidx.appcompat.app.AppCompatDelegate     //Importazione della Classe AppCompactDelegate

class MainActivity : AppCompatActivity() {

    private var rbDay: RadioButton? = null

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView

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

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>

        <item name="android:windowBackground">@color/backgroundwindow</item>
    </style>

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<item name="android:windowBackground">@color/backgroundwindow</item>

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//Imposta il tema in base all'attivazione della modalità risparmio energia
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY)

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//Imposta il tema in base all'impostazione di sistema
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)

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//Imposta il tema chiaro
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)