feat: navigation header styling support

android/src/main/kotlin/com/google/maps/flutter/navigation/GoogleMapsBaseNavigationView.kt

@@ -18,6 +18,7 @@ package com.google.maps.flutter.navigation
 
 import com.google.android.libraries.navigation.ForceNightMode
 import com.google.android.libraries.navigation.NavigationView
+import com.google.android.libraries.navigation.StylingOptions
 
 /**
  * Base class for map views backed by a [NavigationView] from the Navigation SDK.
@@ -45,6 +46,7 @@ abstract class GoogleMapsBaseNavigationView(
   private var _isTrafficIncidentCardsEnabled: Boolean = true
   private var _isTrafficPromptsEnabled: Boolean = true
   private var _isNavigationHeaderEnabled: Boolean = true
+  private var _navigationHeaderStylingOptions = NavigationHeaderStylingOptionsDto()
   private var _isNavigationFooterEnabled: Boolean = true
   private var _isRecenterButtonEnabled: Boolean = true
   private var _isReportIncidentButtonEnabled: Boolean = true
@@ -116,6 +118,48 @@ abstract class GoogleMapsBaseNavigationView(
     _isNavigationHeaderEnabled = enabled
   }
 
+  fun getNavigationHeaderStylingOptions(): NavigationHeaderStylingOptionsDto {
+    return _navigationHeaderStylingOptions
+  }
+
+  fun setNavigationHeaderStylingOptions(stylingOptions: NavigationHeaderStylingOptionsDto) {
+    val builder = StylingOptions()
+
+    stylingOptions.primaryDayModeBackgroundColor?.let {
+      builder.primaryDayModeThemeColor(it.toInt())
+    }
+    stylingOptions.secondaryDayModeBackgroundColor?.let {
+      builder.secondaryDayModeThemeColor(it.toInt())
+    }
+    stylingOptions.primaryNightModeBackgroundColor?.let {
+      builder.primaryNightModeThemeColor(it.toInt())
+    }
+    stylingOptions.secondaryNightModeBackgroundColor?.let {
+      builder.secondaryNightModeThemeColor(it.toInt())
+    }
+    stylingOptions.largeManeuverIconColor?.let { builder.headerLargeManeuverIconColor(it.toInt()) }
+    stylingOptions.smallManeuverIconColor?.let { builder.headerSmallManeuverIconColor(it.toInt()) }
+    stylingOptions.nextStepTextColor?.let { builder.headerNextStepTextColor(it.toInt()) }
+    stylingOptions.nextStepTextSize?.let { builder.headerNextStepTextSize(it.toFloat()) }
+    stylingOptions.distanceValueTextColor?.let { builder.headerDistanceValueTextColor(it.toInt()) }
+    stylingOptions.distanceUnitsTextColor?.let { builder.headerDistanceUnitsTextColor(it.toInt()) }
+    stylingOptions.distanceValueTextSize?.let { builder.headerDistanceValueTextSize(it.toFloat()) }
+    stylingOptions.distanceUnitsTextSize?.let { builder.headerDistanceUnitsTextSize(it.toFloat()) }
+    stylingOptions.instructionsTextColor?.let { builder.headerInstructionsTextColor(it.toInt()) }
+    stylingOptions.instructionsFirstRowTextSize?.let {
+      builder.headerInstructionsFirstRowTextSize(it.toFloat())
+    }
+    stylingOptions.instructionsSecondRowTextSize?.let {
+      builder.headerInstructionsSecondRowTextSize(it.toFloat())
+    }
+    stylingOptions.guidanceRecommendedLaneColor?.let {
+      builder.headerGuidanceRecommendedLaneColor(it.toInt())
+    }
+
+    navigationView.setStylingOptions(builder)
+    _navigationHeaderStylingOptions = stylingOptions
+  }
+
   fun isNavigationFooterEnabled(): Boolean {
     return _isNavigationFooterEnabled
   }

android/src/main/kotlin/com/google/maps/flutter/navigation/GoogleMapsViewMessageHandler.kt

@@ -320,6 +320,17 @@ class GoogleMapsViewMessageHandler(private val viewRegistry: GoogleMapsViewRegis
     getNavigationView(viewId.toInt()).setNavigationHeaderEnabled(enabled)
   }
 
+  override fun getNavigationHeaderStylingOptions(viewId: Long): NavigationHeaderStylingOptionsDto {
+    return getNavigationView(viewId.toInt()).getNavigationHeaderStylingOptions()
+  }
+
+  override fun setNavigationHeaderStylingOptions(
+    viewId: Long,
+    stylingOptions: NavigationHeaderStylingOptionsDto,
+  ) {
+    getNavigationView(viewId.toInt()).setNavigationHeaderStylingOptions(stylingOptions)
+  }
+
   override fun isNavigationFooterEnabled(viewId: Long): Boolean {
     return getNavigationView(viewId.toInt()).isNavigationFooterEnabled()
   }