Add gray reader background option (closes #3019)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -128,7 +128,8 @@ class ReaderActivity : BaseRxActivity<ReaderActivityBinding, ReaderPresenter>()
         setTheme(
             when (preferences.readerTheme().get()) {
                 0 -> R.style.Theme_Reader_Light
-                else -> R.style.Theme_Reader
+                2 -> R.style.Theme_Reader_Dark_Grey
+                else -> R.style.Theme_Reader_Dark
             }
         )
         super.onCreate(savedInstanceState)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderSettingsSheet.kt

@@ -81,7 +81,7 @@ class ReaderSettingsSheet(private val activity: ReaderActivity) : BottomSheetDia
         viewer.setSelection(activity.presenter.manga?.viewer ?: 0, false)
 
         rotation_mode.bindToPreference(preferences.rotation(), 1)
-        background_color.bindToPreference(preferences.readerTheme())
+        background_color.bindToIntPreference(preferences.readerTheme(), R.array.reader_themes_values)
         show_page_number.bindToPreference(preferences.showPageNumber())
         fullscreen.bindToPreference(preferences.fullscreen())
         cutout_short.bindToPreference(preferences.cutoutShort())

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsReaderController.kt

@@ -68,8 +68,8 @@ class SettingsReaderController : SettingsController() {
             intListPreference {
                 key = Keys.readerTheme
                 titleRes = R.string.pref_reader_theme
-                entriesRes = arrayOf(R.string.white_background, R.string.black_background)
-                entryValues = arrayOf("0", "1")
+                entriesRes = arrayOf(R.string.black_background, R.string.gray_background, R.string.white_background)
+                entryValues = arrayOf("1", "2", "0")
                 defaultValue = "1"
                 summary = "%s"
             }

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

@@ -24,13 +24,15 @@
     </string-array>
 
     <string-array name="reader_themes">
-        <item>@string/white_background</item>
         <item>@string/black_background</item>
+        <item>@string/gray_background</item>
+        <item>@string/white_background</item>
     </string-array>
 
     <string-array name="reader_themes_values">
-        <item>0</item>
         <item>1</item>
+        <item>2</item>
+        <item>0</item>
     </string-array>
 
     <string-array name="image_decoders">

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

@@ -240,6 +240,7 @@
     <string name="pref_read_with_long_tap">Long tap dialog</string>
     <string name="pref_reader_theme">Background color</string>
     <string name="white_background">White</string>
+    <string name="gray_background">Gray</string>
     <string name="black_background">Black</string>
     <string name="pref_viewer_type">Default viewer</string>
     <string name="default_viewer">Default</string>

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

@@ -217,14 +217,14 @@
         <item name="switchStyle">@style/Theme.Widget.BasicSwitch</item>
     </style>
 
-    <style name="Theme.Reader" parent="Theme.Base.Reader.Dark">
-        <!-- Attributes specific for SDK 16 to SDK 20 -->
-    </style>
+    <style name="Theme.Reader.Dark" parent="Theme.Base.Reader.Dark" />
 
-    <style name="Theme.Reader.Light" parent="Theme.Base.Reader.Light">
-        <!-- Attributes specific for SDK 16 to SDK 20 -->
+    <style name="Theme.Reader.Dark.Grey" parent="Theme.Base.Reader.Dark">
+        <item name="android:colorBackground">@color/backgroundDark</item>
     </style>
 
+    <style name="Theme.Reader.Light" parent="Theme.Base.Reader.Light" />
+
 
     <!--===============-->
     <!-- Launch Screen -->