Feature layer (GeoPackage)

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Sample viewer app

Display features from a local GeoPackage.

Image of feature layer geopackage

Use case

A GeoPackage is an OGC standard, making it useful when your project requires an open source data format or when other, non-ArcGIS systems may be creating the data. Accessing data from a local GeoPackage is useful when working in an environment that has an inconsistent internet connection or that does not have an internet connection at all. For example, a department of transportation field worker might source map data from a GeoPackage when conducting signage inspections in rural areas with poor network coverage.

How to use the sample

Pan and zoom around the map. View the data loaded from the geopackage.

How it works

  1. Create a GeoPackage passing the URI string into the constructor.
  2. Load the GeoPackage with GeoPackage.loadAsync
  3. When it's done loading, get the GeoPackageFeatureTable objects from the geopackage with geoPackage.getGeoPackageFeatureTables()
  4. Create a FeatureLayer(featureTable) for each feature table and add it to the map as an operational layer. Add each to the map as an operational layer with map.getOperationalLayers().add(featureLayer)

Relevant API

  • ArcGISMap
  • FeatureLayer
  • GeoPackage
  • GeoPackageFeatureTable

Offline Data

  1. Download the data from ArcGIS Online.
  2. Extract the contents of the downloaded zip file to disk.
  3. Open your command prompt and navigate to the folder where you extracted the contents of the data from step 1.
  4. Push the data into the scoped storage of the sample app: adb push AuroraCO.gpkg /Android/data/com.esri.arcgisruntime.sample.featurelayergeopackage/files/AuroraCO.gpkg

About the data

The map shows point locations of public art installations in Aurora, Colorado.

Tags

feature table, geopackage, gpkg, OGC, package, standards

Sample Code

MainActivity.java
                                                                                                           
/* Copyright 2017 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.esri.arcgisruntime.sample.featurelayergeopackage;

import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.FeatureTable;
import com.esri.arcgisruntime.data.GeoPackage;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;

public class MainActivity extends AppCompatActivity {

  private final String TAG = MainActivity.class.getSimpleName();

  private MapView mMapView;
  private ArcGISMap mMap;
  // objects that implement Loadable must be class fields to prevent being garbage collected before loading
  private GeoPackage mGeoPackage;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // authentication with an API key or named user is required to access basemaps and other
    // location services
    ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);

    // inflate MapView from layout
    mMapView = findViewById(R.id.mapView);
    // create a map with the BasemapType topographic
    mMap = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    // set the map to be displayed in this view
    mMapView.setMap(mMap);
    mMapView.setViewpoint(new Viewpoint(39.7294, -104.8319, 100000));

    // Get the full path to the local GeoPackage
    String geoPackagePath = getExternalFilesDir(null) + getString(R.string.aurora_co_gpkg);

    // Open the GeoPackage
    mGeoPackage = new GeoPackage(geoPackagePath);
    mGeoPackage.loadAsync();
    mGeoPackage.addDoneLoadingListener(() -> {
      if (mGeoPackage.getLoadStatus() == LoadStatus.LOADED) {
        // Read the feature tables and get the first one
        FeatureTable geoPackageTable = mGeoPackage.getGeoPackageFeatureTables().get(0);

        // Make sure a feature table was found in the package
        if (geoPackageTable == null) {
          Toast.makeText(MainActivity.this, "No feature table found in the package!", Toast.LENGTH_LONG).show();
          Log.e(TAG, "No feature table found in this package!");
          return;
        }

        // Create a layer to show the feature table
        FeatureLayer featureLayer = new FeatureLayer(geoPackageTable);

        // Add the feature table as a layer to the map (with default symbology)
        mMap.getOperationalLayers().add(featureLayer);
      } else {
        Toast.makeText(MainActivity.this, "GeoPackage failed to load! " + mGeoPackage.getLoadError(), Toast.LENGTH_LONG).show();
        Log.e(TAG, "GeoPackage failed to load!" + mGeoPackage.getLoadError());
      }
    });
  }

  @Override
  protected void onPause() {
    super.onPause();
    mMapView.pause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mMapView.dispose();
  }
}