Feature Layer Query

Screenshot of Feature Layer Query App

Description

This sample demonstrates how to query a feature layer via feature table.

How it Works

When you hit the search button, the sample creates a query parameter object and specifies the where clause on it, using the text you provided. It then fires the query on the feature table using the query features method. In the completion block it gets back an feature query result. It iterates through the results and finds the first feature which it then highlights using select features method on the feature layer.

Code

/* Copyright 2016 ESRI
 *
 * All rights reserved under the copyright laws of the United States
 * and applicable international laws, treaties, and conventions.
 *
 * You may freely redistribute and use this sample code, with or
 * without modification, provided you include the original copyright
 * notice and use restrictions.
 *
 * See the Sample code usage restrictions document for further information.
 *
 */

package com.esri.arcgisruntime.samples.featurelayerquery;

import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;

import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.Feature;
import com.esri.arcgisruntime.data.FeatureQueryResult;
import com.esri.arcgisruntime.data.QueryParameters;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
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 com.esri.arcgisruntime.symbology.SimpleFillSymbol;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;


public class MainActivity extends AppCompatActivity {

    MapView mMapView;
    ServiceFeatureTable mServiceFeatureTable;
    FeatureLayer mFeaturelayer;

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

        // inflate MapView from layout
        mMapView = (MapView) findViewById(R.id.mapView);

        // create a map with the topographic basemap
        final ArcGISMap map = new ArcGISMap(Basemap.createTopographic());
        // set the map to be displayed in the mapview
        mMapView.setMap(map);

        // create feature layer with its service feature table
        // create the service feature table
        mServiceFeatureTable = new ServiceFeatureTable(getResources().getString(R.string.sample_service_url));
        // create the feature layer using the service feature table
        mFeaturelayer = new FeatureLayer(mServiceFeatureTable);
        mFeaturelayer.setOpacity(0.8f);
        //override the renderer
        SimpleLineSymbol lineSymbol= new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLACK, 1);
        SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.YELLOW, lineSymbol);
        mFeaturelayer.setRenderer(new SimpleRenderer(fillSymbol));

        // add the layer to the map
        map.getOperationalLayers().add(mFeaturelayer);

        // zoom to a view point of the USA
        mMapView.setViewpointCenterAsync(new Point(-11000000, 5000000, SpatialReferences.getWebMercator()), 100000000);
    }

    /**
     * Handle the search intent from the search widget
     */
    @Override
    protected void onNewIntent(Intent intent) {
        setIntent(intent);
        if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
            String searchString = intent.getStringExtra(SearchManager.QUERY);

            searchForState(searchString);
        }
    }

    public void searchForState(final String searchString) {

        // clear any previous selections
        mFeaturelayer.clearSelection();

        // create objects required to do a selection with a query
        QueryParameters query = new QueryParameters();
        //make search case insensitive
        query.setWhereClause("upper(STATE_NAME) LIKE '%" + searchString.toUpperCase() + "%'");

        // call select features
        final ListenableFuture<FeatureQueryResult> future = mServiceFeatureTable.queryFeaturesAsync(query);
        // add done loading listener to fire when the selection returns
        future.addDoneListener(new Runnable() {
            @Override
            public void run() {
                try {
                    // call get on the future to get the result
                    FeatureQueryResult result = future.get();

                    // check there are some results
                    if (result.iterator().hasNext()) {

                        // get the extend of the first feature in the result to zoom to
                        Feature feature = result.iterator().next();
                        Envelope envelope = feature.getGeometry().getExtent();
                        mMapView.setViewpointGeometryAsync(envelope, 200);

                        //Select the feature
                        mFeaturelayer.selectFeature(feature);

                    } else {
                        Toast.makeText(MainActivity.this, "No states found with name: " + searchString, Toast.LENGTH_SHORT).show();
                    }
                } catch (Exception e) {
                    Toast.makeText(MainActivity.this, "Feature search failed for: " + searchString + ". Error=" + e.getMessage(), Toast.LENGTH_SHORT).show();
                    Log.e(getResources().getString(R.string.app_name), "Feature search failed for: " + searchString + ". Error=" + e.getMessage());
                }
            }
        });
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);

        // Get the SearchView and set the searchable configuration
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
        // Assumes current activity is the searchable activity
        searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
        searchView.setIconifiedByDefault(false); // Do not iconify the widget; expand it by default

        return true;
    }

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

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