add a setting for always using dark background at fullscreen media

app/src/main/kotlin/com/simplemobiletools/gallery/activities/SettingsActivity.kt

@@ -32,6 +32,7 @@ class SettingsActivity : SimpleActivity() {
         setupAnimateGifs()
         setupMaxBrightness()
         setupCropThumbnails()
+        setupDarkBackground()
         setupScreenRotation()
         setupShowMedia()
         updateTextColors(settings_holder)
@@ -103,6 +104,14 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupDarkBackground() {
+        settings_dark_background.isChecked = config.darkBackground
+        settings_dark_background_holder.setOnClickListener {
+            settings_dark_background.toggle()
+            config.darkBackground = settings_dark_background.isChecked
+        }
+    }
+
     private fun setupScreenRotation() {
         settings_screen_rotation.text = getScreenRotationText()
         settings_screen_rotation_holder.setOnClickListener {

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Config.kt

@@ -148,6 +148,10 @@ class Config(context: Context) : BaseConfig(context) {
         get() = prefs.getBoolean(DISPLAY_FILE_NAMES, false)
         set(display) = prefs.edit().putBoolean(DISPLAY_FILE_NAMES, display).apply()
 
+    var darkBackground: Boolean
+        get() = prefs.getBoolean(DARK_BACKGROUND, false)
+        set(darkBackground) = prefs.edit().putBoolean(DARK_BACKGROUND, darkBackground).apply()
+
     var showMedia: Int
         get() = prefs.getInt(SHOW_MEDIA, IMAGES_AND_VIDEOS)
         set(showMedia) = prefs.edit().putInt(SHOW_MEDIA, showMedia).apply()

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/Constants.kt

@@ -13,6 +13,7 @@ val MAX_BRIGHTNESS = "max_brightness"
 val CROP_THUMBNAILS = "crop_thumbnails"
 val SCREEN_ROTATION = "screen_rotation"
 val DISPLAY_FILE_NAMES = "display_file_names"
+val DARK_BACKGROUND = "dark_background"
 val PINNED_FOLDERS = "pinned_folders"
 val DIR_COLUMN_CNT = "dir_column_cnt"
 val MEDIA_COLUMN_CNT = "media_column_cnt"

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

@@ -188,6 +188,26 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_dark_background_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_dark_background"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/dark_background_at_fullscreen"/>
+
+        </RelativeLayout>
+
         <RelativeLayout
             android:id="@+id/settings_screen_rotation_holder"
             android:layout_width="match_parent"

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">System setting</string>
     <string name="screen_rotation_device_rotation">Device rotation</string>
     <string name="screen_rotation_aspect_ratio">Aspect ratio</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">Systemeinstellung</string>
     <string name="screen_rotation_device_rotation">Gerätedrehung</string>
     <string name="screen_rotation_aspect_ratio">Seitenverhältnis</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">Paramètres système</string>
     <string name="screen_rotation_device_rotation">Rotation de l\'appareil</string>
     <string name="screen_rotation_aspect_ratio">Ratio d\'aspect</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">System setting</string>
     <string name="screen_rotation_device_rotation">Device rotation</string>
     <string name="screen_rotation_aspect_ratio">Aspect ratio</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">Impostazione di sistema</string>
     <string name="screen_rotation_device_rotation">Rotazione dispositivo</string>
     <string name="screen_rotation_aspect_ratio">Proporzioni</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">System setting</string>
     <string name="screen_rotation_device_rotation">Device rotation</string>
     <string name="screen_rotation_aspect_ratio">Aspect ratio</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">System setting</string>
     <string name="screen_rotation_device_rotation">Device rotation</string>
     <string name="screen_rotation_aspect_ratio">Aspect ratio</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-pt-rBR/strings.xml

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">Padrão do sistema</string>
     <string name="screen_rotation_device_rotation">Sensor do aparelho</string>
     <string name="screen_rotation_aspect_ratio">Proporção da mídia</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">Системные настройки</string>
     <string name="screen_rotation_device_rotation">Поворот устройства</string>
     <string name="screen_rotation_aspect_ratio">Соотношение сторон</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">Systémového nastavenia</string>
     <string name="screen_rotation_device_rotation">Otočenia zariadenia</string>
     <string name="screen_rotation_aspect_ratio">Pomeru strán</string>
-    <string name="dark_background_at_fullscreen">Stále použiť tmavé pozadie pri médiách na celú obrazovku</string>
+    <string name="dark_background_at_fullscreen">Tmavé pozadie pri médiách na celú obrazovku</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">System setting</string>
     <string name="screen_rotation_device_rotation">Device rotation</string>
     <string name="screen_rotation_aspect_ratio">Aspect ratio</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">Sistem ayarı</string>
     <string name="screen_rotation_device_rotation">Cihaz döndürme</string>
     <string name="screen_rotation_aspect_ratio">En-boy oranı</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-zh-rCN/strings.xml

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">System setting</string>
     <string name="screen_rotation_device_rotation">Device rotation</string>
     <string name="screen_rotation_aspect_ratio">Aspect ratio</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

app/src/main/res/values-zh-rTW/strings.xml

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">System setting</string>
     <string name="screen_rotation_device_rotation">Device rotation</string>
     <string name="screen_rotation_aspect_ratio">Aspect ratio</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->

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

@@ -92,7 +92,7 @@
     <string name="screen_rotation_system_setting">System setting</string>
     <string name="screen_rotation_device_rotation">Device rotation</string>
     <string name="screen_rotation_aspect_ratio">Aspect ratio</string>
-    <string name="dark_background_at_fullscreen">Always use dark background at fullscreen media</string>
+    <string name="dark_background_at_fullscreen">Dark background at fullscreen media</string>
 
     <!-- Strings displayed only on Google Playstore. Optional, but good to have -->
     <!-- Short description has to have less than 80 chars -->