black theme option

src/Android/Resources/values/styles.xml

@@ -49,6 +49,7 @@
   </style>
 
   <style name="BlackTheme.Base" parent="DarkTheme.Base">
+    <item name="android:windowBackground">@android:color/black</item>
   </style>
 
   <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">

src/App/Pages/Accounts/HomePage.xaml.cs

@@ -9,7 +9,8 @@ namespace Bit.App.Pages
         public HomePage()
         {
             InitializeComponent();
-            _logo.Source = ThemeManager.GetTheme() == "dark" ? "logo_white.png" : "logo.png";
+            var theme = ThemeManager.GetTheme();
+            _logo.Source = theme == "dark" || theme == "black" ? "logo_white.png" : "logo.png";
         }
 
         private void LogIn_Clicked(object sender, EventArgs e)

src/App/Pages/Settings/OptionsPage.xaml.cs

@@ -1,5 +1,6 @@
 using Bit.App.Resources;
 using System;
+using System.Collections.Generic;
 using Xamarin.Forms;
 
 namespace Bit.App.Pages

src/App/Pages/Settings/OptionsPageViewModel.cs

@@ -59,6 +59,10 @@ namespace Bit.App.Pages
                 new KeyValuePair<string, string>("light", AppResources.Light),
                 new KeyValuePair<string, string>("dark", AppResources.Dark),
             };
+            if(Device.RuntimePlatform == Device.Android)
+            {
+                ThemeOptions.Add(new KeyValuePair<string, string>("black", AppResources.Black));
+            }
             UriMatchOptions = new List<KeyValuePair<UriMatchType?, string>>
             {
                 new KeyValuePair<UriMatchType?, string>(UriMatchType.Domain, AppResources.BaseDomain),

src/App/Resources/AppResources.Designer.cs

@@ -726,6 +726,15 @@ namespace Bit.App.Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Black.
+        /// </summary>
+        public static string Black {
+            get {
+                return ResourceManager.GetString("Black", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Brand.
         /// </summary>

src/App/Resources/AppResources.resx

@@ -1576,4 +1576,8 @@
   <data name="PINRequireMasterPasswordRestart" xml:space="preserve">
     <value>You you want to require unlocking with your master password when the application is restarted?</value>
   </data>
+  <data name="Black" xml:space="preserve">
+    <value>Black</value>
+    <comment>The color black</comment>
+  </data>
 </root>