Show callout

Show a callout with the latitude and longitude of user-tapped points.

Use case

Callouts are used to display temporary detail content on a map. You can display text and arbitrary UI controls in callouts.

How to use the sample

Tap anywhere on the map. A callout showing the WGS84 coordinates for the tapped point will appear.

How it works

1. Listen for GeoViewTapped events on the map view.
2. When the user taps, get the tapped location from the Location property of the GeoViewInputEventArgs.
3. Project the geometry to WGS84 using GeometryEngine.Project.
4. Create a string to display the coordinates; note that latitude and longitude in WGS84 map to the Y and X coordinates.
5. Create a new callout definition using a title and the coordinate string.
6. Display the callout by calling ShowCalloutAt on the map view with the location and the callout definition.

Relevant API

• CalloutDefinition
• GeometryEngine.Project
• GeoViewTappedEventArgs
• MapView.GeoViewTapped
• MapView.ShowCalloutAt

Tags

balloon, bubble, callout, flyout, flyover, info window, popup, tap

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<?xml version="1.0" encoding="utf-8" ?>

<ContentPage x:Class="ArcGISRuntime.Samples.ShowCallout.ShowCallout"
             xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms;assembly=Esri.ArcGISRuntime.Xamarin.Forms">
    <StackLayout Orientation="Vertical">
        <Label Text="Tap to show a callout." VerticalOptions="Start" />
        <esriUI:MapView x:Name="MyMapView" VerticalOptions="FillAndExpand" />
    </StackLayout>
</ContentPage>