getTotalFeatureCount() always 0

CharlesLoftis — Sat, 11 Dec 2021 16:41:22 GMT

Using ArcGIS android API,

I need to count the number of features in a specfic layer for use later in my app.

APPROACH:

After my map's getLoadStatus() returns "LOADED", I iterate through my map's layers. When the appropriate layer is found I cast the layer to a FeatureLayer, then get the feature table and count of items in that table. Code below:

   // Note 'map' is an ArcGISMap object
   MainActivity.this.arcGISMap = map; // save ArcGISMap reference for later
   MainActivity.this.mMapView.setMap(map);
   LayerList mMapOperationalLayers = MainActivity.this.arcGISMap.getOperationalLayers(); // get map's LayerList
   for (final Layer layer : mMapOperationalLayers) {
      Log.d("layer", layer.getName());
      if ((layer.getName().toUpperCase().equals("LAYER_OF_INTEREST")) {
         MainActivity.this.layer_of_interest = (FeatureLayer) layer; // save layer reference for later
       //MainActivity.this.pages_count = (((FeatureLayer) layer).getFeatureTable()).getTotalFeatureCount();
         MainActivity.this.pages_count = MainActivity.this.layer_of_interest.getFeatureTable().getTotalFeatureCount();
         Log.d("loadMobileMapPackage", "pages_count:" + MainActivity.this.pages_count);
      } // end if
   } // end for

PROBLEM

'getTotalFeatureCount()' always returns 0 at runtime, but when I set a breakpoint and step through the code I get the expected feature count for the layer of interest. Is there some race condition with counting?

QUESTION:

What am I doing wrong? Is there a better way to count the number of features having a non-zero attribute value in a specific map layer?

Re: getTotalFeatureCount() always 0

CharlesLoftis — Sat, 11 Dec 2021 16:41:25 GMT

I was able to answer my own question. I needed to wait until the feature table loads before I check the count.

Correct code below:

   LayerList mMapOperationalLayers = MainActivity.this.arcGISMap.getOperationalLayers(); // get map's LayerList
   for (final Layer layer : mMapOperationalLayers) {
      Log.d("layer", layer.getName());
      if ((layer.getName().toUpperCase().equals("LAYER_OF_INTEREST")) {
         MainActivity.this.layer_of_interest = (FeatureLayer) layer; // save layer reference for later
         final FeatureTable featureTable = MainActivity.this.layer_of_interest.getFeatureTable();
         featureTable.addDoneLoadingListener(new Runnable() {
            @Override
            public void run() {
               MainActivity.this.pages_count = featureTable.getTotalFeatureCount();
               Log.d("loadMobileMapPackage", "pages_count:" + MainActivity.this.pages_count);
            }
         });
      } // end if
   } // end for

topic Re: getTotalFeatureCount() always 0 in ArcGIS Runtime SDK for Android Questions

getTotalFeatureCount() always 0

Re: getTotalFeatureCount() always 0