Add: Dynamic theming preference

src/main/kotlin/com/machiav3lli/fdroid/content/Preferences.kt

@@ -219,7 +219,8 @@ object Preferences {
 
     sealed class Theme(override val valueString: String) : Enumeration<Theme> {
         override val values: List<Theme>
-            get() = if (Android.sdk(29)) listOf(System, AmoledSystem, Light, Dark, Amoled)
+            get() = if (Android.sdk(31)) listOf(Dynamic, System, AmoledSystem, Light, Dark, Amoled)
+            else if (Android.sdk(29)) listOf(System, AmoledSystem, Light, Dark, Amoled)
             else listOf(Light, Dark, Amoled)
 
         abstract fun getResId(configuration: Configuration): Int
@@ -238,6 +239,12 @@ object Preferences {
             }
         }
 
+        object Dynamic : Theme("dynamic-system") {
+            override fun getResId(configuration: Configuration): Int {
+                return -1
+            }
+        }
+
         object Light : Theme("light") {
             override fun getResId(configuration: Configuration): Int = R.style.Theme_Main_Light
         }

src/main/kotlin/com/machiav3lli/fdroid/ui/fragments/PrefsUserFragment.kt

@@ -32,6 +32,7 @@ class PrefsUserFragment : PrefsNavFragmentX() {
                     is Preferences.Theme.AmoledSystem -> getString(R.string.system) + " " + getString(
                         R.string.amoled
                     )
+                    is Preferences.Theme.Dynamic -> getString(R.string.dynamic)
                     is Preferences.Theme.Light -> getString(R.string.light)
                     is Preferences.Theme.Dark -> getString(R.string.dark)
                     is Preferences.Theme.Amoled -> getString(R.string.amoled)

src/main/kotlin/com/machiav3lli/fdroid/utility/Utils.kt

@@ -241,6 +241,12 @@ val isBlackTheme: Boolean
         else -> false
     }
 
+val isDynamicColorsTheme: Boolean
+    get() = when (Preferences[Preferences.Key.Theme]) {
+        is Preferences.Theme.Dynamic -> true
+        else -> false
+    }
+
 fun Context.showBatteryOptimizationDialog() {
     AlertDialog.Builder(this)
         .setTitle(R.string.ignore_battery_optimization_title)

src/main/res/values/strings.xml

@@ -207,4 +207,5 @@
     <string name="loading_list">Loading list…</string>
     <string name="releases">Releases</string>
     <string name="no_updates_available">No versions available</string>
+    <string name="dynamic">System dynamic</string>
 </resources>