HERE SDK - Raster layers are not transparent - here-api

Question

I am using the Navigate Edition of HERE SDK for Android. I am adding custom raster layers and two of my layers are transparent (Lite Edition showed the layers correctly), but the MapView shows these layers with a white background instead of transparent. This is bad as the white background hides the underlying map. Am I missing something to have the transparent layer?
Here's my code:
private RasterDataSource createRasterDataSource() {
List<Integer> storageLevels = Arrays.asList(2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
RasterDataSourceConfiguration.Provider rasterProviderConfig = new RasterDataSourceConfiguration.Provider(
mTemplateUrl,
TilingScheme.QUAD_TREE_MERCATOR,
storageLevels);
String path = "cache/raster/toner";
long maxDiskSizeInBytes = 1024 * 1024 * 32;
RasterDataSourceConfiguration.Cache cacheConfig = new RasterDataSourceConfiguration.Cache(path, maxDiskSizeInBytes);
return new RasterDataSource(mMapView.getMapContext(),
new RasterDataSourceConfiguration(mName, rasterProviderConfig, cacheConfig));
}
private MapLayer createMapLayer() {
MapLayerPriority priority = new MapLayerPriorityBuilder()
.renderedAfterLayer("ocm_cartography")
.build();
MapLayerVisibilityRange range = new MapLayerVisibilityRange(0, 22 + 1);
try {
MapLayer mapLayer = new MapLayerBuilder()
.forMap(mMapView.getHereMap()) // mandatory parameter
.withName(mName + "Layer") // mandatory parameter
.withDataSource(mName, mMapContentType)
.withPriority(priority)
.withVisibilityRange(range)
.build();
return mapLayer;
} catch (MapLayerBuilder.InstantiationException e) {
throw new RuntimeException(e.getMessage());
}
}
The mMapContentType is MapContentType.RASTER_IMAGE

Answer 1

Got support from HERE team (thanks!) and for transparent layers I had to set the hasAlphaChannel for the RasterDataSourceConfiguration.Provider:
RasterDataSourceConfiguration.Provider rasterProviderConfig = new RasterDataSourceConfiguration.Provider(
url,
TilingScheme.QUAD_TREE_MERCATOR,
storageLevels);
rasterProviderConfig.hasAlphaChannel = true;