Allow toggling theme with Android night theme

vector/src/main/java/im/vector/riotx/features/configuration/VectorConfiguration.kt

@@ -65,12 +65,14 @@ class VectorConfiguration @Inject constructor(private val context: Context) {
      *
      * @param theme the new theme
      */
+    /*
     fun updateApplicationTheme(theme: String) {
         ThemeUtils.setApplicationTheme(context, theme)
         updateApplicationSettings(VectorLocale.applicationLocale,
                                   FontScale.getFontScalePrefValue(context),
                                   theme)
     }
+    */
 
     /**
      * Init the configuration from the saved one

vector/src/main/java/im/vector/riotx/features/settings/VectorSettingsPreferencesFragment.kt

@@ -55,7 +55,22 @@ class VectorSettingsPreferencesFragment @Inject constructor(
         findPreference<VectorListPreference>(ThemeUtils.APPLICATION_THEME_KEY)!!
                 .onPreferenceChangeListener = Preference.OnPreferenceChangeListener { _, newValue ->
             if (newValue is String) {
-                vectorConfiguration.updateApplicationTheme(newValue)
+                //vectorConfiguration.updateApplicationTheme(newValue)
+                // Restart the Activity
+                activity?.let {
+                    // Note: recreate does not apply the color correctly
+                    it.startActivity(it.intent)
+                    it.finish()
+                }
+                true
+            } else {
+                false
+            }
+        }
+        findPreference<VectorListPreference>(ThemeUtils.APPLICATION_DARK_THEME_KEY)!!
+                .onPreferenceChangeListener = Preference.OnPreferenceChangeListener { _, newValue ->
+            if (newValue is String) {
+                //vectorConfiguration.updateApplicationTheme(newValue)
                 // Restart the Activity
                 activity?.let {
                     // Note: recreate does not apply the color correctly

vector/src/main/java/im/vector/riotx/features/themes/ThemeUtils.kt

@@ -18,6 +18,7 @@ package im.vector.riotx.features.themes
 
 import android.app.Activity
 import android.content.Context
+import android.content.res.Configuration
 import android.graphics.drawable.Drawable
 import android.util.TypedValue
 import android.view.Menu
@@ -35,6 +36,7 @@ import timber.log.Timber
 object ThemeUtils {
     // preference key
     const val APPLICATION_THEME_KEY = "APPLICATION_THEME_KEY"
+    const val APPLICATION_DARK_THEME_KEY = "APPLICATION_DARK_THEME_KEY"
 
     // the theme possible values
     private const val THEME_DARK_VALUE = "dark"
@@ -57,8 +59,11 @@ object ThemeUtils {
      * @return the selected application theme
      */
     fun getApplicationTheme(context: Context): String {
-        return PreferenceManager.getDefaultSharedPreferences(context)
+        val currentNightMode = context.resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
-                .getString(APPLICATION_THEME_KEY, THEME_LIGHT_VALUE)!!
+        return when (currentNightMode) {
+            Configuration.UI_MODE_NIGHT_YES -> PreferenceManager.getDefaultSharedPreferences(context).getString(APPLICATION_DARK_THEME_KEY, THEME_DARK_VALUE)!!
+            else -> PreferenceManager.getDefaultSharedPreferences(context).getString(APPLICATION_THEME_KEY, THEME_LIGHT_VALUE)!!
+        }
     }
 
     /**

vector/src/main/res/values-de/strings_sc.xml

@@ -3,6 +3,7 @@
 
     <string name="redacted_stub_text">(Gelöschte Nachricht)</string>
 
+    <string name="settings_dark_theme">Nacht-Design</string>
     <string name="sc_theme">SC Schwarz</string>
     <string name="sc_dark_theme">SC Dunkel</string>
     <string name="sc_colored_theme">SC Schwarz, bunte Blasen</string>

vector/src/main/res/values/strings_sc.xml

@@ -3,6 +3,7 @@
 
     <string name="redacted_stub_text">(Deleted message)</string>
 
+    <string name="settings_dark_theme">Night Theme</string>
     <string name="sc_theme">SC Black</string>
     <string name="sc_dark_theme">SC Dark</string>
     <string name="sc_colored_theme">SC Black, colored bubbles</string>

vector/src/main/res/xml/vector_settings_preferences.xml

@@ -21,6 +21,15 @@
             android:title="@string/settings_theme"
             app:iconSpaceReserved="false" />
 
+        <im.vector.riotx.core.preference.VectorListPreference
+            android:defaultValue="dark"
+            android:entries="@array/theme_entries"
+            android:entryValues="@array/theme_values"
+            android:key="APPLICATION_DARK_THEME_KEY"
+            android:summary="%s"
+            android:title="@string/settings_dark_theme"
+            app:iconSpaceReserved="false" />
+
         <im.vector.riotx.core.preference.VectorListPreference
             android:defaultValue="start"
             android:entries="@array/bubble_style_entries"