Added marker is not visible - Mapbox 6.7.0 - mapbox

Question

While trying to add marker to mapbox using symbol layer, the marker was not visible.
Tried to add marker as shown below,
mapView.getMapAsync(m -> {
isMapReady = true;
mapboxMap = m;
mapboxMap.addOnMapClickListener(MapViewFragment.this);
addMarkerToSymbolLayer(45);
updateCameraPosition(location); });
private void updateCameraPosition(Location location){
if (mapboxMap != null) {
LatLng latLong = new LatLng();
if (location != null) {
latLong.setLatitude(location.getLatitude());
latLong.setLongitude(location.getLongitude());
}
final CameraPosition cameraPosition = new CameraPosition.Builder()
.target(latLong)
.build();
mapboxMap.moveCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
mapView.postDelayed(() -> mapboxMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition), AppConstants.MAP_CAMERA_ANIMATE_DURATION_MS_5000), 100);
private void addMarkerToSymbolLayer(float headDirection) {
GeoJsonSource geoJsonSource = new GeoJsonSource("geojson-source",
Feature.fromGeometry(Point.fromLngLat(77.6387, 12.9610)));
mapboxMap.addSource(geoJsonSource);
Bitmap compassNeedleSymbolLayerIcon = BitmapFactory.decodeResource(
getResources(), R.drawable.compass_needle);
mapboxMap.addImage("compass-needle-image-id", compassNeedleSymbolLayerIcon);
SymbolLayer aircraftLayer = new SymbolLayer("aircraft-layer", "geojson-source")
.withProperties(
PropertyFactory.iconImage("compass-needle-image-id"),
PropertyFactory.iconRotate(headDirection),
PropertyFactory.iconIgnorePlacement(true),
PropertyFactory.iconAllowOverlap(true)
);
mapboxMap.addLayer(aircraftLayer);
}
If addMarkerToSymbolLayer() is called after moving camera then the marker is visibile. Why is that adding marker dependent on camera position? I have to move camera many times to meet my requirement. How to handle this?
Also in the Deprecated MarkerView and MarkerViewOptions I didnt have any issues while adding marker.
I noticed that if given a delay of 100ms while calling the function addMarkerToSymbolLayer(45), the marker is visible and things work fine !

Answer 1

The onMapReady() is called even before all the styles have been loaded. It is necessary that all styles be loaded before adding a symbol layer. Add the following listener and call for adding marker inside it.
mapView.addOnDidFinishLoadingStyleListener(new MapView.OnDidFinishLoadingStyleListener() {
#Override
public void onDidFinishLoadingStyle() {
}
});