[android] Adding multiple markers dynamically with rotation

[benjisora]

Platform: Android
Mapbox SDK version: 4.2.0beta

Explained issue

I am a student who's doing his best to use MapBox Android SDK !
I'm using MapBox to display a LOT of markers on a map (which is already kind of an issue since I can't find any tutorial on how to do marker clustering with MapBox Android SDK... but that's not my main issue for now, if someone could explain how to do marker clustering with MapBox Android SDK though, it'd be awesome)

The markers must have a definite colour (out of 4 available), and they must be differently oriented (rotation in degrees of the displayed marker).

What I'm currently doing

mapView.getMapAsync(new OnMapReadyCallback() {
           @Override
           public void onMapReady(final MapboxMap mapboxMap) {


                      //Cleaning the map if it had anything on it before
                      mapboxMap.removeAnnotations();

                      //Creating a list of markers
                      List<MarkerOptions> markers = new ArrayList<>();

                      //Creating my Icon from a drawable ressource
                      Icon yellowIcon = IconFactory.getInstance(context).fromDrawable(ContextCompat.getDrawable(context, R.drawable.yellow_marker));

                      //Filling up the list
                      for (int i = 0; i < numberOfMarkers; i++){
                            markers.add(new MarkerOptions()
                                        .position(lat,lng)
                                        .title("blabla")
                                        .snippet("blabla too")
                                        .icon(yellowIcon)
                            )
                       }

                      //Adding all the markers to the map
                       mapboxMap.addMarkers(markers);

           }
});

Problems I have with what I'm doing

There's no way to rotate the marker the way I'd like to. MarkerViews have a "rotate" option, but there's no way of adding points like I did, dynamically from a List, by calling "add" once only (and not as many times as there are markers).

I did try to create a rotated bitmap of the ressource I need before creating an Icon out of it and using it for the markers, but when I do so :

• I run into an OutOfMemory exception (something like "failed to allocate") if I run that piece of code multiple times.
• The markers appear once, and if I refresh them they're not displayed anymore (I don't really know why) even though they still seem to be created since I still run into the OOM exception caused by the rotated bitmap creations. NOTE: this problem doesn't appear when I don't put any icon, or when I put a custom one, it really just appears when I try to rotate a bitmap beforehand, to use as an Icon

Questions

• Is there any way to rotate a marker icon that is a MarkerOption and not a MarkerView (so I can still use addMarkers to add them all at once) ? Something that doesn't imply having 360 icons for each degree of rotation, multiplicated by the four icon colors I need.
• Is is possible to cluster the markers with what I'm doing to add my markers on the map with Mapbox 4.2.0beta, and if yes, how could I do so (I really can't find any tutorial that properly explains how with mapbox)

Thank you so much for your time, I'm sorry if it was a lot to read, and I hope someone out there will find solutions to my issues ! I'll answer as fast as possible to any kind of question.

Benjisora

[jfirebaugh]

The answer in both cases is unfortunately, no, not at this time.

Markers added via addMarkers can't be rotated; #1734 tracks supporting that.

Marker annotations don't support clustering; #5814 tracks supporting that.

[basitsaleemmb]

@jfirebaugh @benjisora

is there a way that i can remove added list of marker from mapBoxMap ?