Add a point, line, and polygon

Learn how to display point, line, and polygon graphics in a map.

You typically use graphics to display geographic data that is not connected to a database and that is not persisted, like highlighting a route between two locations, displaying a search buffer around a point, or tracking the location of a vehicle in real-time. Graphics are composed of a geometry, symbol, and attributes.

In this tutorial, you display points, lines, and polygons on a map as graphics.

Prerequisites

Steps

Open an Android Studio project

1. To start this tutorial, complete the Display a map tutorial. Or download and unzip the Display a map solution in a new folder.

2. Modify the old project for use in this new tutorial. Expand More info for instructions.

   More info

   1. On your file system, delete the .idea folder, if present, at the top level of your project.

   2. In the Android tool window, open app > res > values > strings.xml.

      In the <string name="app_name"> element, change the text content to Add a point, line, and polygon.

      strings.xml

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      <resources>
      
          <string name="app_name">Add a point, line, and polygon</string>
      
      </resources>

   3. In the Android tool window, open Gradle Scripts > settings.gradle.

      Change the value of rootProject.name to "Add a point, line, and polygon".

      settings.gradle

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      rootProject.name = "Add a point, line, and polygon"
      
      include ':app'

   4. Click File > Sync Project with Gradle files. Android Studio will recognize your changes and create a new .idea folder.

3. If you downloaded the solution project, set your API key.

   More info

   An API Key enables access to services, web maps, and web scenes hosted in ArcGIS Online.

   1. Go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

   2. In Android Studio: in the Android tool window, open app > java > com.example.app > MainActivity.

   3. In the setApiKey() function, find the ApiKey.create() call and paste your API key inside the quotes, replacing YOUR_API_KEY.

      MainActivity.kt

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          private fun setApiKey() {
              // It is not best practice to store API keys in source code. We have you insert one here
              // to streamline this tutorial.
      
              ArcGISEnvironment.apiKey = ApiKey.create("YOUR_API_KEY")
      
          }
      

Add import statements

1. Replace app-specific import statements with the imports needed for this tutorial.

   MainActivity.kt

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   package com.example.app
   
   import androidx.appcompat.app.AppCompatActivity
   import android.os.Bundle
   import android.util.Log
   import android.widget.Toast
   import androidx.databinding.DataBindingUtil
   import com.arcgismaps.ApiKey
   import com.arcgismaps.ArcGISEnvironment
   import com.arcgismaps.Color
   import com.arcgismaps.geometry.Point
   import com.arcgismaps.geometry.PolygonBuilder
   import com.arcgismaps.geometry.PolylineBuilder
   import com.arcgismaps.geometry.SpatialReference
   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.MapView
   import com.example.app.databinding.ActivityMainBinding
   
   class MainActivity : AppCompatActivity() {
   

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Add a graphics overlay

A graphics overlay is a container for graphics. It is used with a map view to display graphics on a map. You can add more than one graphics overlay to a map view. Graphics overlays are displayed on top of all the other layers.

1. In Android Studio, in the Android tool window, open app > java > com.example.app > MainActivity.

2. Create a new function named addGraphics().

3. Create a GraphicsOverlay to display point, line, and polygon graphics and add it to the mapView's collection of graphics overlays.

4. Call the addGraphics() function from the onCreate() lifecycle function.

   MainActivity.kt

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       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
   
           lifecycle.addObserver(mapView)
   
           setApiKey()
   
           setupMap()
   
           addGraphics()
   
       }
   
       private fun setApiKey() {
           // set your API key
           // Note: it is not best practice to store API keys in source code. The API key is referenced
           // here for the convenience of this tutorial.
           ArcGISEnvironment.apiKey = ApiKey.create("YOUR_API_KEY")
       }
   
       private fun addGraphics() {
   
           // create a graphics overlay and add it to the graphicsOverlays property of the map view
           val graphicsOverlay = GraphicsOverlay()
           mapView.graphicsOverlays.add(graphicsOverlay)
   
       }
   

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Add a point graphic

A point graphic is created using a point and a marker symbol. A point is defined with x and y coordinates, and a spatial reference. For latitude and longitude coordinates, the spatial reference is WGS84.

1. Create a Point and a SimpleMarkerSymbol. To create the point, provide longitude (x) and latitude (y) coordinates and a SpatialReference. In this tutorial, call wgs84() on SpatialReference.

   More info

   Point graphics support a number of symbol types such as SimpleMarkerSymbol, PictureMarkerSymbol, and TextSymbol. Learn more about symbols at Symbol in the API Reference.

   Next create a solid, blue, 2px-wide SimpleLineSymbol and assign it to the outline property of simpleMarkerSymbol.

   MainActivity.kt

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       private fun addGraphics() {
   
           // create a graphics overlay and add it to the graphicsOverlays property of the map view
           val graphicsOverlay = GraphicsOverlay()
           mapView.graphicsOverlays.add(graphicsOverlay)
   
           // create a point geometry with a location and spatial reference
           // Point(latitude, longitude, spatial reference)
           val point = Point(-118.8065, 34.0005, SpatialReference.wgs84())
   
           // create a point symbol that is an small red circle
           val simpleMarkerSymbol = SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.red, 10f)
   
           // create a blue outline symbol and assign it to the outline property of the simple marker symbol
           val blueOutlineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(0, 0, 255), 2f)
           simpleMarkerSymbol.outline = blueOutlineSymbol
   
       }
   

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2. Create a Graphic with the point and simpleMarkerSymbol. Display the graphic by adding it to the graphics property of graphicsOverlay.

   MainActivity.kt

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           // create a blue outline symbol and assign it to the outline property of the simple marker symbol
           val blueOutlineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(0, 0, 255), 2f)
           simpleMarkerSymbol.outline = blueOutlineSymbol
   
           // create a graphic with the point geometry and symbol
           val pointGraphic = Graphic(point, simpleMarkerSymbol)
   
           // add the point graphic to the graphics overlay
           graphicsOverlay.graphics.add(pointGraphic)
   

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3. Click Run > Run > app to run the app.

   More info

   In Android Studio, you have two choices for running your app: an actual Android device or the Android Emulator.

   Android device

   Connect your computer to your Android device, using USB or Wi-Fi. For more details, see How to connect your Android device.

   Android Emulator

   Create an AVD (Android Virtual Device) to run in the Android Emulator. For details, see Run apps on the Android Emulator.

   Selecting a device

   When you build and run an app in Android Studio, you must first select a device. From the Android Studio toolbar, you can access the drop-down list of your currently available devices, both virtual and physical.

   .

   If you cannot access the list on the toolbar, click Tools > Device Manager.

You should see a point graphic in Point Dume State Beach.

Add a line graphic

A line graphic is created using a polyline and a line symbol. A polyline is defined as a sequence of points.

1. Create a Polyline and a SimpleLineSymbol. To create the polyline: create a PolylineBuilder, and then call toGeometry() on the polygon builder to get the polyline.

   More info

   Line graphics support a number of symbol types such as SimpleMarkerSymbol and TextSymbol. Learn more about symbols at Symbol in the API Reference.

   MainActivity.kt

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           // add the point graphic to the graphics overlay
           graphicsOverlay.graphics.add(pointGraphic)
   
           // Create a polylineBuilder with a spatial reference and add three points to it.
           // Then get the polyline from the polyline builder
   
           // create a blue line symbol for the polyline
           val polylineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(0, 0, 255), 3f)
           val polylineBuilder = PolylineBuilder(SpatialReference.wgs84()) {
               addPoint(-118.8215, 34.0139)
               addPoint(-118.8148, 34.0080)
               addPoint(-118.8088, 34.0016)
           }
           val polyline = polylineBuilder.toGeometry()
   
   

   Expand

2. Create a Graphic with the polyline and polylineSymbol. Display the graphic by adding it to the graphics property of graphicsOverlay.

   MainActivity.kt

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           // create a blue line symbol for the polyline
           val polylineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(0, 0, 255), 3f)
           val polylineBuilder = PolylineBuilder(SpatialReference.wgs84()) {
               addPoint(-118.8215, 34.0139)
               addPoint(-118.8148, 34.0080)
               addPoint(-118.8088, 34.0016)
           }
           val polyline = polylineBuilder.toGeometry()
   
           // create a polyline graphic with the polyline geometry and symbol
           val polylineGraphic = Graphic(polyline, polylineSymbol)
   
           // add the polyline graphic to the graphics overlay
           graphicsOverlay.graphics.add(polylineGraphic)
   

   Expand

3. Click Run > Run > app to run the app.

   More info

   In Android Studio, you have two choices for running your app: an actual Android device or the Android Emulator.

   Android device

   Connect your computer to your Android device, using USB or Wi-Fi. For more details, see How to connect your Android device.

   Android Emulator

   Create an AVD (Android Virtual Device) to run in the Android Emulator. For details, see Run apps on the Android Emulator.

   Selecting a device

   When you build and run an app in Android Studio, you must first select a device. From the Android Studio toolbar, you can access the drop-down list of your currently available devices, both virtual and physical.

   .

   If you cannot access the list on the toolbar, click Tools > Device Manager.

You should see a point and line graphic along Westward Beach.

Add a polygon graphic

A polygon graphic is created using a polygon and a fill symbol. A polygon is defined as a sequence of points that describe a closed boundary.

1. Create a Polygon and a SimpleFillSymbol. To create the polygon: create a PolygonBuilder, and then call toGeometry() on the polygon builder to get the polygon.

   More info

   Polygon graphics support a number of symbol types such as SimpleFillSymbol, PictureFillSymbol, SimpleMarkerSymbol and TextSymbol. Learn more about symbols at Symbol in the API Reference.

   Next, create a SimpleFillSymbol that has a solid red fill with an alpha channel of 128 and uses the blueOutlineSymbol defined earlier.

   MainActivity.kt

   Expand

   Use dark colors for code blocks

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   Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.

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           // add the polyline graphic to the graphics overlay
           graphicsOverlay.graphics.add(polylineGraphic)
   
           // Create a polygon builder with a spatial reference and add five vertices (points) to it.
           // Then get the polygon from the polygon builder.
           val polygonBuilder = PolygonBuilder(SpatialReference.wgs84()) {
               addPoint(-118.8189, 34.0137)
               addPoint(-118.8067, 34.0215)
               addPoint(-118.7914, 34.0163)
               addPoint(-118.7959, 34.0085)
               addPoint(-118.8085, 34.0035)
           }
           val polygon = polygonBuilder.toGeometry()
   
           // Create a red fill symbol with an alpha component of 128: values can run from 0 to 255).
           // Then create the blue simple line symbol
           val polygonFillSymbol =
               SimpleFillSymbol(
                   SimpleFillSymbolStyle.Solid,
                   Color.fromRgba(255, 0, 0, 128),
                   blueOutlineSymbol
               )
   
   

   Expand

2. Create a Graphic with the polygon and polygonFillSymbol. Display the graphic by adding it to the graphics property of graphicsOverlay.

   MainActivity.kt

   Expand

   Use dark colors for code blocks

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   Add line.Add line.Add line.Add line.

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           // Create a red fill symbol with an alpha component of 128: values can run from 0 to 255).
           // Then create the blue simple line symbol
           val polygonFillSymbol =
               SimpleFillSymbol(
                   SimpleFillSymbolStyle.Solid,
                   Color.fromRgba(255, 0, 0, 128),
                   blueOutlineSymbol
               )
   
           // create a polygon graphic from the polygon geometry and symbol
           val polygonGraphic = Graphic(polygon, polygonFillSymbol)
           // add the polygon graphic to the graphics overlay
           graphicsOverlay.graphics.add(polygonGraphic)
   

   Expand

3. Click Run > Run > app to run the app.

   More info

   In Android Studio, you have two choices for running your app: an actual Android device or the Android Emulator.

   Android device

   Connect your computer to your Android device, using USB or Wi-Fi. For more details, see How to connect your Android device.

   Android Emulator

   Create an AVD (Android Virtual Device) to run in the Android Emulator. For details, see Run apps on the Android Emulator.

   Selecting a device

   When you build and run an app in Android Studio, you must first select a device. From the Android Studio toolbar, you can access the drop-down list of your currently available devices, both virtual and physical.

   .

   If you cannot access the list on the toolbar, click Tools > Device Manager.

You should see a point, line, and polygon graphic around Mahou Riviera in the Santa Monica Mountains.