[android] - introduce StyleCallback, make parent class for StateCallback

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/NativeMapView.java

@@ -48,7 +48,7 @@ final class NativeMapView {
 
   private static final String TAG = "Mbgl-NativeMapView";
 
-  //Hold a reference to prevent it from being GC'd as long as it's used on the native side
+  // Hold a reference to prevent it from being GC'd as long as it's used on the native side
   private final FileSource fileSource;
 
   // Used to schedule work on the MapRenderer Thread
@@ -71,7 +71,8 @@ final class NativeMapView {
   // Flag to indicating destroy was called
   private boolean destroyed = false;
 
-  private Style style;
+  // Used for style load callbacks
+  private StyleCallback styleCallback;
 
   // Holds the pointer to JNI NativeMapView
   @Keep
@@ -939,8 +940,8 @@ final class NativeMapView {
   @Keep
   private void onWillStartLoadingMap() {
     stateCallback.onWillStartLoadingMap();
-    if (style != null) {
-      style.onWillStartLoadingStyle();
+    if (styleCallback != null) {
+      styleCallback.onWillStartLoadingMap();
     }
   }
 
@@ -976,7 +977,7 @@ final class NativeMapView {
 
   @Keep
   private void onDidFinishLoadingStyle() {
-    style.onDidFinishLoadingStyle();
+    styleCallback.onDidFinishLoadingStyle();
     stateCallback.onDidFinishLoadingStyle();
   }
 
@@ -1341,9 +1342,8 @@ final class NativeMapView {
     });
   }
 
-  // TODO remove dependency of Style on NativeMapView
-  public void setStyle(Style style) {
-    this.style = style;
+  void setStyleCallback(@NonNull StyleCallback callback) {
+    this.styleCallback = callback;
   }
 
   //
@@ -1407,15 +1407,19 @@ final class NativeMapView {
     Bitmap getViewContent();
   }
 
-  public interface StateCallback {
+  interface StyleCallback {
+    void onWillStartLoadingMap();
+
+    void onDidFinishLoadingStyle();
+  }
+
+  interface StateCallback extends StyleCallback {
     void onCameraWillChange(boolean animated);
 
     void onCameraIsChanging();
 
     void onCameraDidChange(boolean animated);
 
-    void onWillStartLoadingMap();
-
     void onDidFinishLoadingMap();
 
     void onDidFailLoadingMap(String error);
@@ -1428,8 +1432,6 @@ final class NativeMapView {
 
     void onDidFinishRenderingMap(boolean fully);
 
-    void onDidFinishLoadingStyle();
-
     void onSourceChanged(String sourceId);
   }
 }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/Style.java

@@ -25,7 +25,7 @@ import java.util.List;
  * has been loaded by underlying map.
  * </p>
  */
-public class Style {
+public class Style implements NativeMapView.StyleCallback {
 
   private final NativeMapView nativeMapView;
   private final HashMap<String, Source> sources = new HashMap<>();
@@ -365,7 +365,8 @@ public class Style {
    * Called when the underlying map will start loading a new style. This method will clean up this style
    * by setting the java sources and layers in a detached state and removing them from core.
    */
-  void onWillStartLoadingStyle() {
+  @Override
+  public void onWillStartLoadingMap() {
     for (Source source : sources.values()) {
       if (source != null) {
         source.setDetached();
@@ -388,7 +389,8 @@ public class Style {
    * Called when the underlying map has finished loading this style.
    * This method will add all components added to the builder that were defined with the 'with' prefix.
    */
-  void onDidFinishLoadingStyle() {
+  @Override
+  public void onDidFinishLoadingStyle() {
     if (!styleLoaded) {
       styleLoaded = true;
       for (Source source : builder.sources) {
@@ -597,7 +599,7 @@ public class Style {
      */
     void build(@NonNull NativeMapView nativeMapView, @Nullable OnStyleLoaded styleLoaded) {
       Style style = new Style(this, nativeMapView, styleLoaded);
-      nativeMapView.setStyle(style);
+      nativeMapView.setStyleCallback(style);
 
       if (styleUrl != null) {
         nativeMapView.setStyleUrl(styleUrl);