Add theme settings

app/src/main/java/org/koitharu/kotatsu/KotatsuApp.kt

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu
 
 import android.app.Application
+import androidx.appcompat.app.AppCompatDelegate
 import androidx.room.Room
 import coil.Coil
 import coil.ImageLoader
@@ -23,6 +24,7 @@ class KotatsuApp : Application() {
 		super.onCreate()
 		initKoin()
 		initCoil()
+		AppCompatDelegate.setDefaultNightMode(AppSettings(this).theme)
 	}
 
 	private fun initKoin() {

app/src/main/java/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -3,9 +3,11 @@ package org.koitharu.kotatsu.core.prefs
 import android.content.Context
 import android.content.SharedPreferences
 import android.content.res.Resources
+import androidx.appcompat.app.AppCompatDelegate
 import androidx.preference.PreferenceManager
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.utils.delegates.prefs.EnumPreferenceDelegate
+import org.koitharu.kotatsu.utils.delegates.prefs.StringIntPreferenceDelegate
 
 class AppSettings private constructor(resources: Resources, private val prefs: SharedPreferences) : SharedPreferences by prefs {
 
@@ -13,6 +15,8 @@ class AppSettings private constructor(resources: Resources, private val prefs: S
 
 	var listMode by EnumPreferenceDelegate(ListMode::class.java, resources.getString(R.string.key_list_mode), ListMode.DETAILED_LIST)
 
+	val theme by StringIntPreferenceDelegate(resources.getString(R.string.key_theme), AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
+
 	fun subscribe(listener: SharedPreferences.OnSharedPreferenceChangeListener) {
 		prefs.registerOnSharedPreferenceChangeListener(listener)
 	}

app/src/main/java/org/koitharu/kotatsu/ui/common/BasePreferenceFragment.kt

@@ -1,6 +1,5 @@
 package org.koitharu.kotatsu.ui.common
 
-import android.content.Context
 import androidx.annotation.StringRes
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
@@ -13,8 +12,8 @@ abstract class BasePreferenceFragment(@StringRes private val titleId: Int) :
 
 	protected val settings by inject<AppSettings>()
 
-	override fun onAttach(context: Context) {
-		super.onAttach(context)
+	override fun onResume() {
+		super.onResume()
 		activity?.setTitle(titleId)
 	}
 

app/src/main/java/org/koitharu/kotatsu/ui/settings/AppearanceSettingsFragment.kt

@@ -3,12 +3,15 @@ package org.koitharu.kotatsu.ui.settings
 import android.content.SharedPreferences
 import android.os.Bundle
 import android.view.View
+import androidx.appcompat.app.AppCompatDelegate
 import androidx.collection.arrayMapOf
+import androidx.preference.ListPreference
 import androidx.preference.Preference
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.prefs.ListMode
 import org.koitharu.kotatsu.ui.common.BasePreferenceFragment
 import org.koitharu.kotatsu.ui.main.list.ListModeSelectDialog
+import org.koitharu.kotatsu.utils.ext.bindSummary
 
 class AppearanceSettingsFragment : BasePreferenceFragment(R.string.appearance),
 	SharedPreferences.OnSharedPreferenceChangeListener {
@@ -18,6 +21,7 @@ class AppearanceSettingsFragment : BasePreferenceFragment(R.string.appearance),
 
 		findPreference<Preference>(R.string.key_list_mode)?.summary =
 			listModes[settings.listMode]?.let(::getString)
+		findPreference<ListPreference>(R.string.key_theme)?.bindSummary()
 	}
 
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -44,6 +48,9 @@ class AppearanceSettingsFragment : BasePreferenceFragment(R.string.appearance),
 		when (key) {
 			getString(R.string.key_list_mode) -> findPreference<Preference>(R.string.key_list_mode)?.summary =
 				listModes[settings.listMode]?.let(::getString)
+			getString(R.string.key_theme) -> {
+				AppCompatDelegate.setDefaultNightMode(settings.theme)
+			}
 		}
 	}
 

app/src/main/java/org/koitharu/kotatsu/utils/delegates/prefs/StringIntPreferenceDelegate.kt

@@ -0,0 +1,20 @@
+package org.koitharu.kotatsu.utils.delegates.prefs
+
+import android.content.SharedPreferences
+import androidx.core.content.edit
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+class StringIntPreferenceDelegate(private val key: String, private val defValue: Int) :
+	ReadWriteProperty<SharedPreferences, Int> {
+
+	override fun getValue(thisRef: SharedPreferences, property: KProperty<*>): Int {
+		return thisRef.getString(key, defValue.toString())?.toIntOrNull() ?: defValue
+	}
+
+	override fun setValue(thisRef: SharedPreferences, property: KProperty<*>, value: Int) {
+		thisRef.edit {
+			putString(key, value.toString())
+		}
+	}
+}

app/src/main/res/values/arrays.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string-array name="themes">
+        <item>@string/automatic</item>
+        <item>@string/light</item>
+        <item>@string/dark</item>
+    </string-array>
+</resources>

app/src/main/res/values/constants.xml

@@ -1,4 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 	<string name="key_list_mode">list_mode</string>
+	<string name="key_theme">theme</string>
+	<string-array name="values_theme">
+		<item>-1</item>
+		<item>1</item>
+		<item>2</item>
+	</string-array>
 </resources>

app/src/main/res/values/strings.xml

@@ -56,4 +56,8 @@
 	<string name="genre">Genre</string>
 	<string name="filter">Filter</string>
 	<string name="appearance">Appearance</string>
+    <string name="theme">Theme</string>
+	<string name="light">Light</string>
+	<string name="dark">Dark</string>
+	<string name="automatic">Automatic</string>
 </resources>

app/src/main/res/xml/pref_appearance.xml

@@ -3,10 +3,19 @@
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto">
 
+	<ListPreference
+		android:defaultValue="-1"
+		android:entries="@array/themes"
+		android:entryValues="@array/values_theme"
+		android:key="@string/key_theme"
+		android:title="@string/theme"
+		app:iconSpaceReserved="false" />
+
 	<Preference
 		android:key="@string/key_list_mode"
-		android:title="@string/list_mode"
 		android:persistent="false"
+		android:title="@string/list_mode"
+		app:allowDividerAbove="true"
 		app:iconSpaceReserved="false" />
 
 </PreferenceScreen>