WFS XML query

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/*
 * Copyright 2019 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.wfsxmlquery;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

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

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.FeatureQueryResult;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.ogc.wfs.OgcAxisOrder;
import com.esri.arcgisruntime.ogc.wfs.WfsFeatureTable;

public class MainActivity extends AppCompatActivity {

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

  private MapView mMapView;

  @Override protected void onCreate(@Nullable 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);

    mMapView = findViewById(R.id.mapView);

    // create a map and set the map to display in the map view
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_NAVIGATION);
    mMapView.setMap(map);

    // create the WFS feature table from URL and name
    WfsFeatureTable statesTable = new WfsFeatureTable(getString(R.string.wfs_feature_table_url),
        getString(R.string.wfs_feature_table_table_name));

    // set the feature request mode and axis order
    statesTable.setAxisOrder(OgcAxisOrder.NO_SWAP);
    statesTable.setFeatureRequestMode(ServiceFeatureTable.FeatureRequestMode.MANUAL_CACHE);

    // create a feature layer to visualize the table.
    FeatureLayer statesLayer = new FeatureLayer(statesTable);

    // add the layer to the map.
    mMapView.getMap().getOperationalLayers().add(statesLayer);

    try {
      String xmlQuery = loadQueryFromAssets();

      ListenableFuture<FeatureQueryResult> featureQueryResultFuture = statesTable
          .populateFromServiceAsync(xmlQuery, true);

      featureQueryResultFuture.addDoneListener(() -> {
        // set the viewpoint of the map view to the extent reported by the feature layer
        mMapView.setViewpointGeometryAsync(statesLayer.getFullExtent(), 50);
      });
    } catch (IOException e) {
      logErrorToUser(getString(R.string.error_reading_xml_file, e.getMessage()));
    }
  }

  private void logErrorToUser(String error) {
    Toast.makeText(this, error, Toast.LENGTH_SHORT).show();
    Log.e(TAG, error);
  }

  private String loadQueryFromAssets() throws IOException {
    StringBuilder xmlString = new StringBuilder();
    BufferedReader bufferedReader = new BufferedReader(
        new InputStreamReader(getAssets().open(getString(R.string.xml_query_file_name))));
    String line;
    while ((line = bufferedReader.readLine()) != null) {
      xmlString.append(line);
    }
    bufferedReader.close();
    return xmlString.toString();
  }

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

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

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