android: Add black backgrounds toggle

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/Settings.kt

@@ -137,6 +137,7 @@ class Settings {
         const val PREF_FIRST_APP_LAUNCH = "FirstApplicationLaunch"
         const val PREF_THEME = "Theme"
         const val PREF_THEME_MODE = "ThemeMode"
+        const val PREF_BLACK_BACKGROUNDS = "BlackBackgrounds"
 
         private val configFileSectionsMap: MutableMap<String, List<String>> = HashMap()
 

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -10,6 +10,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.preference.PreferenceManager
 import org.yuzu.yuzu_emu.R
 import org.yuzu.yuzu_emu.YuzuApplication
+import org.yuzu.yuzu_emu.features.settings.model.AbstractBooleanSetting
 import org.yuzu.yuzu_emu.features.settings.model.AbstractIntSetting
 import org.yuzu.yuzu_emu.features.settings.model.AbstractSetting
 import org.yuzu.yuzu_emu.features.settings.model.IntSetting
@@ -380,6 +381,28 @@ class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView)
                     R.array.themeModeValues
                 )
             )
+
+            val blackBackgrounds: AbstractBooleanSetting = object : AbstractBooleanSetting {
+                override var boolean: Boolean
+                    get() = preferences.getBoolean(Settings.PREF_BLACK_BACKGROUNDS, false)
+                    set(value) {
+                        preferences.edit().putBoolean(Settings.PREF_BLACK_BACKGROUNDS, value).apply()
+                        settingsActivity.recreate()
+                    }
+                override val key: String? = null
+                override val section: String? = null
+                override val isRuntimeEditable: Boolean = true
+                override val valueAsString: String
+                    get() = preferences.getBoolean(Settings.PREF_BLACK_BACKGROUNDS, false).toString()
+            }
+
+            add(
+                SwitchSetting(
+                    blackBackgrounds,
+                    R.string.use_black_backgrounds,
+                    R.string.use_black_backgrounds_description
+                )
+            )
         }
     }
 }

src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/ThemeHelper.kt

@@ -33,6 +33,9 @@ object ThemeHelper {
             DEFAULT -> activity.setTheme(R.style.Theme_Yuzu_Main)
             MATERIAL_YOU -> activity.setTheme(R.style.Theme_Yuzu_Main_MaterialYou)
         }
+        if (preferences.getBoolean(Settings.PREF_BLACK_BACKGROUNDS, false)) {
+            activity.setTheme(R.style.ThemeOverlay_Yuzu_Dark)
+        }
     }
 
     @JvmStatic

src/android/app/src/main/res/layout/activity_settings.xml

@@ -4,7 +4,8 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?attr/colorSurface">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appbar_settings"

src/android/app/src/main/res/values-night/themes.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <style name="ThemeOverlay.Yuzu.Dark" parent="">
+        <item name="colorSurface">@android:color/black</item>
+        <item name="android:colorBackground">@android:color/black</item>
+    </style>
+
+</resources>

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

@@ -241,4 +241,8 @@
     <string name="theme_mode_light">Light</string>
     <string name="theme_mode_dark">Dark</string>
 
+    <!-- Black backgrounds theme -->
+    <string name="use_black_backgrounds">Use Black Backgrounds</string>
+    <string name="use_black_backgrounds_description">When using the dark theme, apply black backgrounds.</string>
+
 </resources>