[android] - correct anchoring when Icon is updated (#8519)

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/annotations/MarkerView.java

@@ -389,6 +389,15 @@ public class MarkerView extends Marker {
     }
   }
 
+  /**
+   * Invalidates the MarkerView resulting in remeasuring the View.
+   */
+  void invalidate() {
+    width = height = 0;
+    offsetX = offsetY = MapboxConstants.UNMEASURED;
+    markerViewManager.invalidateViewMarkersInVisibleRegion();
+  }
+
   /**
    * Get the String representation of a MarkerView.
    *

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/annotations/MarkerViewManager.java

@@ -233,6 +233,7 @@ public class MarkerViewManager implements MapView.OnMapChangedListener {
     View convertView = markerViewMap.get(markerView);
     if (convertView != null && convertView instanceof ImageView) {
       ((ImageView) convertView).setImageBitmap(markerView.getIcon().getBitmap());
+      markerView.invalidate();
     }
   }