Kotlin Data Collection Application

Question

Hi Community,

I am trying to develop a Kotlin android application using ArcGIS Maps SDK Kotlin and ArcGIS Runtime 200. The data collection I want to apply for a polygon layer. I had gone through some of the sample projects which is talking about data collection on a point Layer. My question here is to implement the polygon editin g which classes i have to use. Is it com.esri.arcgismaps.geometry.Polygon and addFeature function OR use the Sketch Editor.

HarishKV · Answer

@RamaChintapalli expecting you reply

HarishKV · Answer

Hi Rama,

I had written the code like follows and has some errors in the applyEdits can you check and comment on the same "

package com.esri.arcgismaps.sample.sketchonmap

import android.content.pm.PackageManager
import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.AdapterView
import android.widget.ArrayAdapter
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.lifecycleScope
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.arcgismaps.Color
import com.arcgismaps.data.ServiceFeatureTable
import com.arcgismaps.geometry.GeometryBuilder
import com.arcgismaps.geometry.GeometryType
import com.arcgismaps.geometry.Multipoint
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.Polygon
import com.arcgismaps.geometry.Polyline
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleFillSymbol
import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.geometryeditor.GeometryEditor
import com.arcgismaps.mapping.view.geometryeditor.VertexTool
import com.arcgismaps.mapping.layers.FeatureLayer
import com.arcgismaps.mapping.view.LocationDisplay
import com.esri.arcgismaps.sample.sketchonmap.databinding.ActivityMainBinding
import com.google.android.material.snackbar.Snackbar
import kotlinx.coroutines.launch
import android.Manifest
import android.widget.Toast

class MainActivity : AppCompatActivity() {

private val activityMainBinding: ActivityMainBinding by lazy {
        DataBindingUtil.setContentView(this, R.layout.activity_main)
}

private val mapView by lazy {
        activityMainBinding.mapView
    }

private val selectedGeometryDropdown by lazy {
        activityMainBinding.pointLinePolygonToolbar.selectGeometryDropdown
    }

private val locationDisplay: LocationDisplay by lazy {
        mapView.locationDisplay
    }

// create a symbol for the point graphic
    private val pointSymbol: SimpleMarkerSymbol by lazy {
        SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Square,
            Color(getColor(R.color.point_symbol_color)),
            20f)
}

// create a symbol for a line graphic
    private val lineSymbol: SimpleLineSymbol by lazy {
        SimpleLineSymbol(
            SimpleLineSymbolStyle.Solid,
            Color(getColor(R.color.line_symbol_color)),
            4f
        )
}

// create a symbol for the fill graphic
    private val fillSymbol: SimpleFillSymbol by lazy {
        SimpleFillSymbol(
            SimpleFillSymbolStyle.Cross,
            Color(getColor(R.color.fill_symbol_color)),
            lineSymbol
        )
}

// keep the instance graphic overlay to add graphics on the map
    private var graphicsOverlay: GraphicsOverlay = GraphicsOverlay()

// keep the instance of the vertex tool
    private val vertexTool: VertexTool = VertexTool()

// keep the instance to create new geometries, and change existing geometries
    private var geometryEditor: GeometryEditor = GeometryEditor()

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.API_KEY)
lifecycle.addObserver(mapView)

// create and add a map with a navigation night basemap style
        mapView.apply {
            map = ArcGISMap(BasemapStyle.ArcGISLightGray)
            setViewpoint(Viewpoint(34.056295, -117.195800, 100000.0))
graphicsOverlays.add(graphicsOverlay)
val landUrl = "https://services7.arcgis.com/r3Nggl3TgKPtY1CE/arcgis/rest/services/Plot_area/FeatureServer"
            val landServiceFeatureTable = ServiceFeatureTable(landUrl)
map!!.operationalLayers.add(FeatureLayer.createWithFeatureTable(landServiceFeatureTable))

}

// set MapView's geometry editor to sketch on map
        mapView.geometryEditor = geometryEditor

// enable/disable the undo button if last event can be undone
        lifecycleScope.launch {
            geometryEditor.canUndo.collect { value ->
                activityMainBinding.pointLinePolygonToolbar.undoButton.isEnabled = value
}
        }

// enable/disable the redo button if the last event can be redone
        lifecycleScope.launch {
            geometryEditor.canRedo.collect { value ->
                activityMainBinding.pointLinePolygonToolbar.redoButton.isEnabled = value
}
        }

// set up the geometry list dropdown
        selectedGeometryDropdown.apply {
            // set the adapter to the list of geometries
            setAdapter(
                ArrayAdapter(
applicationContext,
                    com.esri.arcgismaps.sample.sampleslib.R.layout.custom_dropdown_item,
                    resources.getStringArray(R.array.geometry_list)
                )
            )

// set the dropdown click listener
            onItemClickListener = AdapterView.OnItemClickListener { _, _, position, _ ->
                // set the GeometryEditorTool and then start the editing process
                geometryEditor.apply {
                    when (position) {
0 -> {
tool = vertexTool
                            start(GeometryType.Polygon)
                        }

}
}
            }
        }
    }

/**
     * Undo the last event on the GeometryEditor.
     */
    fun undo(view: View) {
geometryEditor.undo()
    }

/**
     * Redo the last undone event on the GeometryEditor.
     */
    fun redo(view: View) {
geometryEditor.redo()
    }

private fun requestPermissions() {
// coarse location permission
        val permissionCheckCoarseLocation =
            ContextCompat.checkSelfPermission(
this@MainActivity,
                Manifest.permission.ACCESS_COARSE_LOCATION
            ) ==
                    PackageManager.PERMISSION_GRANTED
        // fine location permission
        val permissionCheckFineLocation =
            ContextCompat.checkSelfPermission(
this@MainActivity,
                Manifest.permission.ACCESS_FINE_LOCATION
            ) ==
                    PackageManager.PERMISSION_GRANTED

// if permissions are not already granted, request permission from the user
        if (!(permissionCheckCoarseLocation && permissionCheckFineLocation)) {
            ActivityCompat.requestPermissions(
this@MainActivity,
                arrayOf(
                    Manifest.permission.ACCESS_COARSE_LOCATION,
                    Manifest.permission.ACCESS_FINE_LOCATION
                ),
                2
            )
        } else {
// permission already granted, so start the location display
            lifecycleScope.launch {
                locationDisplay.dataSource.start()
}
        }
    }

override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<String>,
        grantResults: IntArray
    ) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
// if request is cancelled, the results array is empty
        if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
lifecycleScope.launch {
                locationDisplay.dataSource.start()
}
        }

}

private fun showError(message: String) {
        Toast.makeText(applicationContext, message, Toast.LENGTH_LONG).show()
        Log.e(localClassName, message)
    }

/**
     * When the stop button is clicked, check that sketch is valid. If so, get the geometry from
     * the sketch, set its symbol and add it to the graphics overlay.
     */
    fun stop(view: View) {
// get the geometry from sketch editor
        val sketchGeometry = geometryEditor.geometry.value
            ?: return showMessage("Error retrieving geometry")

if (!GeometryBuilder.builder(sketchGeometry).isSketchValid) {
return reportNotValid()
        }

// stops the editing session
        geometryEditor.stop()

// clear the UI selection
        selectedGeometryDropdown.setText("")
selectedGeometryDropdown.clearFocus()

// create a graphic from the sketch editor geometry
        val graphic = Graphic(sketchGeometry).apply {
            // assign a symbol based on geometry type
            symbol = when (sketchGeometry) {
is Polygon -> fillSymbol
                is Polyline -> lineSymbol
                is Point, is Multipoint -> pointSymbol
                else -> null
            }
}

// add the graphic to the graphics overlay
        graphicsOverlay.graphics.add(graphic)

applyEditsToServiceFeatureTable(graphic)
    }

private fun applyEditsToServiceFeatureTable(graphic: Graphic) {

val landUrl = "https://services7.arcgis.com/r3Nggl3TgKPtY1CE/arcgis/rest/services/Plot_area/FeatureServer"
        val landServiceFeatureTable = ServiceFeatureTable(landUrl)

// Create a feature with the geometry from the graphic
        val feature = landServiceFeatureTable.createFeature(graphic.geometry as com.arcgismaps.geometry.Geometry)

// Add the feature to the list of features to be updated
        val featuresToUpdate = mutableListOf(feature)

// Apply edits to the service feature table
        landServiceFeatureTable.applyEditsAsync(featuresToUpdate, null, null) { result ->
            if (result.isSuccessful) {
                showMessage("Edits applied successfully")
            } else {
                showMessage("Error applying edits: ${result.error.message}")
            }
}

}

/**
     * Clear the MapView of all the graphics and reset selections
     */
    fun clear(view: View) {
geometryEditor.clearGeometry()
geometryEditor.clearSelection()
geometryEditor.stop()
selectedGeometryDropdown.setText("")
selectedGeometryDropdown.clearFocus()
        showMessage(getString(R.string.cleared_message))
    }

/**
     * Clear all editing and applied graphics on the map
     */
    fun restart(view: View) {
graphicsOverlay.graphics.clear()
geometryEditor.clearGeometry()
geometryEditor.clearSelection()
geometryEditor.stop()
selectedGeometryDropdown.setText("")
selectedGeometryDropdown.clearFocus()
        showMessage(getString(R.string.restart_message))
    }

/**
     * Called if sketch is invalid. Reports to user why the sketch was invalid.
     */
    private fun reportNotValid() {
// get the geometry currently being added to map
        val geometry = geometryEditor.geometry.value ?: return showMessage("Geometry not found")
// find the geometry type, and set the valid message
        val validIfText: String = when (geometry) {
is Point -> getString(R.string.invalid_point_message)
is Multipoint -> getString(R.string.invalid_multipoint_message)
is Polyline -> getString(R.string.invalid_polyline_message)
is Polygon -> getString(R.string.invalid_polygon_message)
else -> getString(R.string.none_selected_message)
        }
// set the invalid message to the TextView.
        showMessage(validIfText)
    }

private fun showMessage(message: String) {
        Log.e(localClassName, message)
        Snackbar.make(mapView, message, Snackbar.LENGTH_SHORT).show()
    }
}

"

RamaChintapalli · Answer

Hi,

For sketching (including polygon) you can use the GeometryEditor. Here is a sample that show cases the sketching experience. The result geometry from the sketching can then be applied to your feature table edits.

Thanks
Rama