Query feature table

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Sample viewer app

Find features in a feature table which match an SQL query.

Image of query feature table

Use case

Query expressions can be used in ArcGIS to select a subset of features from a feature table. This is most useful in large or complicated data sets. A possible use case might be on a feature table marking the location of street furniture through a city. A user may wish to query by a TYPE column to return "benches". In this sample, we query a U.S. state by STATE_NAME from a feature table containing all U.S. states.

How to use the sample

Input the name of a U.S. state into the text field. When you click the search icon on the device keypad or press the enter key, a query is performed and the matching features are highlighted or an error is returned.

How it works

Create a ServiceFeatureTable using the URL of a feature service.
Create a QueryParameters with a where clause specified using whereClause().
Perform the query using queryFeatures(queryParameters) on the service feature table.
When complete, the query will return a FeatureQueryResult which can be iterated over to get the matching features.

Relevant API

FeatureLayer
FeatureQueryResult
QueryParameters
ServiceFeatureTable

About the data

This sample uses U.S. State polygon features from the USA 2016 Daytime Population feature service.

Additional information

This sample uses the GeoViewCompose Toolkit module to be able to implement a Composable MapView.

Sample Code

MainActivity.kt

MapViewModel.kt

MainScreen.kt

SearchBar.kt

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/* Copyright 2023 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.
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package com.esri.arcgismaps.sample.queryfeaturetable

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.runtime.Composable
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.esri.arcgismaps.sample.sampleslib.theme.SampleAppTheme
import com.esri.arcgismaps.sample.queryfeaturetable.screens.MainScreen

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // authentication with an API key or named user is
        // required to access basemaps and other location services
        ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.ACCESS_TOKEN)

        setContent {
            SampleAppTheme {
                QueryFeatureTableApp()
            }
        }
    }

    @Composable
    private fun QueryFeatureTableApp() {
        Surface(
            color = MaterialTheme.colorScheme.background
        ) {
            MainScreen(
                sampleName = getString(R.string.query_feature_table_app_name)
            )
        }
    }
}