How to properly load a geopackage?

[Rafael_LuizFontana]

Hi,

I'm trying to follow this sample code https://developers.arcgis.com/net/latest/android/sample-code/featurelayergeopackage.htm#GUID-D49CFDE... but in JAVA, using this file https://www.arcgis.com/home/item.html?id=68ec42517cdd439e81b036210483e8e7. 

When I try to get the feature layer (line 51) the list is empty. Did I do something wrong?

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.LinearLayout;

import com.esri.arcgisruntime.data.FeatureTable;
import com.esri.arcgisruntime.data.GeoPackage;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.MapView;

import java.io.File;

public class MainActivity extends AppCompatActivity {

    private MapView mapView;
    private final String filename = "AuroraCO.gpkg";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        createLayout();
        initialize();
    }

    private void createLayout() {
        LinearLayout linearLayout = new LinearLayout(this);
        linearLayout.setOrientation(LinearLayout.VERTICAL);
        mapView = new MapView(this);
        linearLayout.addView(mapView);
        setContentView(linearLayout);
    }

    private void initialize() {
        new AsyncTask<Void, Void, Void>() {
            @Override
            protected void onPreExecute() {
                mapView.setMap(new ArcGISMap(Basemap.Type.LIGHT_GRAY_CANVAS, 39.7294, -104.8319, 9));
            }

            @Override
            protected Void doInBackground(Void... voids) {
                String geoPackagePath = getGeoPackagePath();
                final GeoPackage geoPackage = new GeoPackage(geoPackagePath);

                geoPackage.addDoneLoadingListener(new Runnable() {
                    @Override
                    public void run() {
                        FeatureTable featureTable = geoPackage.getGeoPackageFeatureTables().get(0);
                        final FeatureLayer featureLayer = new FeatureLayer(featureTable);
                        featureLayer.addDoneLoadingListener(new Runnable() {
                            @Override
                            public void run() {
                                mapView.getMap().getOperationalLayers().add(featureLayer);
                            }
                        });
                        featureLayer.loadAsync();
                    }
                });
                geoPackage.loadAsync();
                return null;
            }
        }.execute();
    }

    private String getGeoPackagePath() {
        String folder = "/storage/emulated/0/labs/";
        File file = new File(folder + filename);
        if(!file.exists()){
            return "";
        }
        return file.getPath();
    }
}
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