From 7bbe3fb9b57dc3b8c49552784dc9c724e400cddd Mon Sep 17 00:00:00 2001
From: Philipp Crocoll <philipp@crocoll.net>
Date: Fri, 19 Feb 2021 12:04:47 +0100
Subject: [PATCH] allow to choose Light/Dark Design as indicated by the system
 settings (Android 10+), closes
 https://github.com/PhilippC/keepass2android/issues/966

---
 src/keepass2android/Resources/values-de/strings.xml |  1 +
 src/keepass2android/Resources/values/config.xml     |  3 ++-
 src/keepass2android/Resources/values/strings.xml    |  1 +
 src/keepass2android/Utils/ActivityDesign.cs         | 11 +++++++++++
 4 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/keepass2android/Resources/values-de/strings.xml b/src/keepass2android/Resources/values-de/strings.xml
index 30f25237..92ae5b65 100644
--- a/src/keepass2android/Resources/values-de/strings.xml
+++ b/src/keepass2android/Resources/values-de/strings.xml
@@ -943,6 +943,7 @@ Erstes öffentliches Release</string>
   <string-array name="design_options">
     <item>Hell</item>
     <item>Dunkel</item>
+    <item>Wie System</item>
   </string-array>
   <string name="design_title">Design</string>
   <string-array name="ftp_encryption_modes">
diff --git a/src/keepass2android/Resources/values/config.xml b/src/keepass2android/Resources/values/config.xml
index 9ee8fe7d..38c93f9c 100644
--- a/src/keepass2android/Resources/values/config.xml
+++ b/src/keepass2android/Resources/values/config.xml
@@ -177,10 +177,11 @@
     	<item>28</item>
     </string-array>
 
-	<string name="design_default">Light</string>
+	<string name="design_default">System</string>
 	<string-array name="design_values">
 		<item>Light</item>
 		<item>Dark</item>
+    <item>System</item>
 	</string-array>
 	
 	<string name="AcceptAllServerCertificates_default">WARN</string>
diff --git a/src/keepass2android/Resources/values/strings.xml b/src/keepass2android/Resources/values/strings.xml
index f4ad145f..0b63b250 100644
--- a/src/keepass2android/Resources/values/strings.xml
+++ b/src/keepass2android/Resources/values/strings.xml
@@ -1198,6 +1198,7 @@ Initial public release
 	<string-array name="design_options">
 		<item>Light</item>
 		<item>Dark</item>
+    <item>System settings</item>
 	</string-array>
 
 	<string name="design_title">Design</string>
diff --git a/src/keepass2android/Utils/ActivityDesign.cs b/src/keepass2android/Utils/ActivityDesign.cs
index d47a5549..9d345433 100644
--- a/src/keepass2android/Utils/ActivityDesign.cs
+++ b/src/keepass2android/Utils/ActivityDesign.cs
@@ -1,6 +1,8 @@
 using System;
 using System.Linq;
 using Android.App;
+using Android.Content.Res;
+using Android.OS;
 using Android.Preferences;
 
 namespace keepass2android
@@ -121,6 +123,15 @@ namespace keepass2android
 			{
 				var prefs = PreferenceManager.GetDefaultSharedPreferences(_activity);
 				string design = prefs.GetString(_activity.GetString(Resource.String.design_key), _activity.GetString(Resource.String.design_default));
+
+                if ((design == "System") && (int)Build.VERSION.SdkInt>=29 && _activity.Resources.Configuration != null)
+                {
+                    UiMode nightModeFlags = ((UiMode)((int)_activity.Resources.Configuration.UiMode & (int)Android.Content.Res.UiMode.NightMask));
+
+                    if (nightModeFlags == UiMode.NightYes)
+                        return true;
+                }
+
 				bool dark = (design == "Dark");
 				return dark;
 			}