How to get the fields in each layer of a DynamicMapServiceLayer?

FrancisGagne

Here's a bit of code I got:

('layer' is a ArcGISDynamicMapServiceLayer already initialized)

ArcGISLayerInfo[] childLayers = layer.getAllLayers();

for (ArcGISLayerInfo child : childLayers) {

     LayerServiceInfo serviceInfo = child.getLayerServiceInfo();

     for (Field field : serviceInfo.getFields()) {

            childInfo.addFieldName(field.getName());

     }

....

}

When I print the serviceInfo.toString(), I get:

Layers [id=4, name=Lage druk, defaultVisibility=true, parentLayerId=-1,

             subLayerIds=[5, 19, 20, 21, 22],

             geometryType=null,

             fields=null,

             objectIdField=null, globalIdField=null, typeIdField=null,

             featureTypes=null,

             hasAttachments=false,

             definitionExpression=null]

Can I have access to the fields of an DynamicMapServiceLayer like this?

Thanks,

MengyiGuo

Yes. You need to fetch the information once in your application, otherwise it will be null. Once you fetched it, it will be stored.

fetchLayerServiceInfo asynchronously fetches the <A href="https://developers.arcgis.com/android/api-reference/reference/com/esri/core/ags/LayerServiceInfo.html" style="color: #006699;" rel="nofollow noopener noreferrer">LayerServiceInfo</A> for the specified sublayer. If the LayerServiceInfo has already been fetched, then it will simply return that. Otherwise a network request will be made to fetch it. Once it has been fetched, it will be cached so that<A href="https://developers.arcgis.com/android/api-reference/reference/com/esri/android/map/ags/ArcGISDynamicMapServiceLayer.html#getLayerServiceInfo(int)" style="color: #006699;" rel="nofollow noopener noreferrer">getLayerServiceInfo(int)</A> will return it, and so that it won't be fetched more than once.