LocationDisplay class final

Manages the display of a device's location in an ArcGISMapViewController.

Location display can retrieve the device's current location from a LocationDataSource and display it on top of an ArcGISMap. As the device moves, the map view can respond to new locations by updating the position of the location symbol on the display. It can also set the viewpoint when an updated location is received, or automatically pan and rotate the map when the current location, heading, or course changes.

Each ArcGISMapViewController has its own instance of LocationDisplay so you don't have to explicitly instantiate the location display. The location information is provided by a LocationDataSource. The current position of the device is provided by default from the operating system. To start receiving location updates, and display the current location, you must start the location display's data source.

Apart from the device operating system's built-in location, you can also display locations from other sources, including external (high accuracy) GPS, an indoor positioning system (IPS), or simulated locations (for mocking location updates) using the following location data sources:

By default, the location display uses a blue, round symbol to show the current location. Depending on signal strength, satellite positions, and other factors, the accuracy of the reported location can vary. An additional blue circle (LocationDisplay.accuracySymbol) around the location symbol indicates the estimated range of accuracy for the current location. As locations are read from the configured LocationDataSource, this outer circle may contract and expand as accuracy increases or decreases. You can display further information about the location using the following symbols:

You can change the default symbology of these symbols to make them more visible against the underlying map cartography, increase their visibility for visually impaired users, or match an app's visual appearance.

Implemented types

Constructors

LocationDisplay()
Creates a location display that can be assigned to an ArcGISMapViewController.
factory

Properties

accuracySymbol ↔ ArcGISSymbol
A symbol used to represent location accuracy.
getter/setter pair
acquiringSymbol ↔ ArcGISSymbol
The symbol used to display the last known location while the current location is being acquired.
getter/setter pair
arcGISMapLocation → ArcGISPoint?
The map position of the most recent location reported by the location data source in the projection of the current map view.
no setter
autoPanMode ↔ LocationDisplayAutoPanMode
Defines how the ArcGISMapViewController reacts when location updates are received.
getter/setter pair
courseSymbol ↔ ArcGISSymbol
The symbol used to display the current location and the course (direction of travel) when moving.
getter/setter pair
dataSource ↔ LocationDataSource
The location data source used for generating location updates.
getter/setter pair
defaultSymbol ↔ ArcGISSymbol
The symbol used for the location when not moving.
getter/setter pair
hashCode → int
The hash code for this object.
no setterinherited
heading → double
The heading angle of the current location in degrees relative to north.
no setter
headingSymbol ↔ ArcGISSymbol
The symbol used for the location when the auto-pan mode is LocationDisplayAutoPanMode.compassNavigation.
getter/setter pair
initialZoomScale ↔ double
The scale that the map should automatically be zoomed to upon receiving the first location update.
getter/setter pair
location → ArcGISLocation?
The most recent location reported by the location data source.
no setter
The navigation point height factor. The factor will decide the location symbol position vertically from the bottom of the map when the auto-pan mode is LocationDisplayAutoPanMode.navigation. When navigating in a map, the current location is typically vertically positioned near the bottom of the map, and horizontally centered in the map, so that the map displays as much of the route ahead as possible.
getter/setter pair
onAutoPanModeChanged → Stream<LocationDisplayAutoPanMode>
Sets a callback to be invoked when the LocationDisplay.autoPanMode of the location display has been changed.
no setter
onLocationChanged → Stream<ArcGISLocation>
Sets a callback to be invoked when the location property of the location display has been changed.
no setter
onStatusChanged → Stream<bool>
Sets a callback to be invoked when the started property of the location display has been changed.
no setter
opacity ↔ double
The opacity value of all symbols displayed by the LocationDisplay. The value should be between 0 and 1.
getter/setter pair
pingAnimationSymbol ↔ ArcGISSymbol
The symbol that will be animated around the location symbol, to indicate when location updates are received.
getter/setter pair
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
showAccuracy ↔ bool
True if the LocationDisplay.accuracySymbol is shown, false otherwise.
getter/setter pair
showLocation ↔ bool
True if location symbols are shown, false otherwise.
getter/setter pair
showPingAnimationSymbol ↔ bool
True if the LocationDisplay.pingAnimationSymbol is shown, false otherwise.
getter/setter pair
started → bool
True if the location display is currently active (the LocationDataSource has been started), false otherwise.
no setter
useCourseSymbolOnMovement ↔ bool
True if the LocationDisplay.courseSymbol is used to display current location, when the location updates indicate the device is moving, false otherwise.
getter/setter pair
wanderExtentFactor ↔ double
The wander extent factor controls the re-centering behavior of the ArcGISMapViewController when the location changes.
getter/setter pair

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
start() → void
The method is to call the start callback function of the location data source.
stop() → void
The method is to call the stop callback function of the location data source.
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited