Add support for custom font stack in symbol options

android/src/main/java/com/mapbox/mapboxgl/Convert.java

@@ -294,6 +294,10 @@ static void interpretSymbolOptions(Object o, SymbolOptionsSink sink) {
     if (iconAnchor != null) {
       sink.setIconAnchor(toString(iconAnchor));
     }
+    final ArrayList fontNames = (ArrayList) data.get("fontNames");
+    if (fontNames != null) {
+      sink.setFontNames((String[]) fontNames.toArray(new String[0]));
+    }
     final Object textField = data.get("textField");
     if (textField != null) {
       sink.setTextField(toString(textField));

android/src/main/java/com/mapbox/mapboxgl/SymbolBuilder.java

@@ -49,6 +49,9 @@ public void setIconAnchor(String iconAnchor) {
     symbolOptions.withIconAnchor(iconAnchor);
   }
 
+  @Override
+  public void setFontNames(String[] fontNames) { symbolOptions.withTextFont(fontNames); }
+
   @Override
   public void setTextField(String textField) {
     symbolOptions.withTextField(textField);

android/src/main/java/com/mapbox/mapboxgl/SymbolController.java

@@ -67,6 +67,9 @@ public void setIconAnchor(String iconAnchor) {
     symbol.setIconAnchor(iconAnchor);
   }
 
+  @Override
+  public void setFontNames(String[] fontNames) { symbol.setTextFont(fontNames); }
+
   @Override
   public void setTextField(String textField) {
     symbol.setTextField(textField);

android/src/main/java/com/mapbox/mapboxgl/SymbolOptionsSink.java

@@ -23,6 +23,8 @@ interface SymbolOptionsSink {
 
   void setIconAnchor(String iconAnchor);
 
+  void setFontNames(String[] fontNames);
+
   void setTextField(String textField);
 
   void setTextSize(float textSize);

example/lib/place_symbol.dart

@@ -106,13 +106,28 @@ class PlaceSymbolBodyState extends State<PlaceSymbolBody> {
   }
 
   SymbolOptions _getSymbolOptions(String iconImage, int symbolCount){
-    return SymbolOptions(
-      geometry: LatLng(
-        center.latitude + sin(symbolCount * pi / 6.0) / 20.0,
-        center.longitude + cos(symbolCount * pi / 6.0) / 20.0,
-      ),
-      iconImage: iconImage,
+    LatLng geometry = LatLng(
+      center.latitude + sin(symbolCount * pi / 6.0) / 20.0,
+      center.longitude + cos(symbolCount * pi / 6.0) / 20.0,
     );
+    return iconImage == 'customFont'
+        ? SymbolOptions(
+            geometry: geometry,
+            iconImage: 'airport-15',
+            fontNames: ['DIN Offc Pro Bold', 'Arial Unicode MS Regular'],
+            textField: 'Airport',
+            textSize: 12.5,
+            textOffset: Offset(0, 0.8),
+            textAnchor: 'top',
+            textColor: '#000000',
+            textHaloBlur: 1,
+            textHaloColor: '#ffffff',
+            textHaloWidth: 0.8,
+          )
+        : SymbolOptions(
+            geometry: geometry,
+            iconImage: iconImage,
+          );
   }
 
   Future<void> _addAll(String iconImage) async {
@@ -334,6 +349,10 @@ class PlaceSymbolBodyState extends State<PlaceSymbolBody> {
                           onPressed: () =>
                               (_symbolCount == 12) ? null : _add("networkImage"), //networkImage added to the style in _onStyleLoaded
                         ),
+                        FlatButton(
+                          child: const Text('add (custom font)'),
+                          onPressed: () => (_symbolCount == 12) ? null : _add("customFont"),
+                        )
                       ],
                     ),
                     Column(

ios/Classes/Convert.swift

@@ -176,6 +176,9 @@ class Convert {
         if let iconHaloBlur = options["iconHaloBlur"] as? CGFloat {
             delegate.iconHaloBlur = iconHaloBlur
         }
+        if let fontNames = options["fontNames"] as? [String] {
+            delegate.fontNames = fontNames
+        }
         if let textField = options["textField"] as? String {
             delegate.text = textField
         }

mapbox_gl_platform_interface/lib/src/symbol.dart

@@ -49,6 +49,7 @@ class SymbolOptions {
     this.iconRotate,
     this.iconOffset,
     this.iconAnchor,
+    this.fontNames,
     this.textField,
     this.textSize,
     this.textMaxWidth,
@@ -78,6 +79,7 @@ class SymbolOptions {
   final double iconRotate;
   final Offset iconOffset;
   final String iconAnchor;
+  final List<String> fontNames;
   final String textField;
   final double textSize;
   final double textMaxWidth;
@@ -113,6 +115,7 @@ class SymbolOptions {
       iconRotate: changes.iconRotate ?? iconRotate,
       iconOffset: changes.iconOffset ?? iconOffset,
       iconAnchor: changes.iconAnchor ?? iconAnchor,
+      fontNames: changes.fontNames ?? fontNames,
       textField: changes.textField ?? textField,
       textSize: changes.textSize ?? textSize,
       textMaxWidth: changes.textMaxWidth ?? textMaxWidth,
@@ -152,6 +155,7 @@ class SymbolOptions {
     addIfPresent('iconRotate', iconRotate);
     addIfPresent('iconOffset', _offsetToJson(iconOffset));
     addIfPresent('iconAnchor', iconAnchor);
+    addIfPresent('fontNames', fontNames);
     addIfPresent('textField', textField);
     addIfPresent('textSize', textSize);
     addIfPresent('textMaxWidth', textMaxWidth);