Method IdentifyGraphicsOverlaysAsync

IdentifyGraphicsOverlaysAsync(PointF, Double, Boolean)

Identifies the topmost graphic in each graphics overlay, at the given screen point.

Declaration

public async Task<IReadOnlyList<IdentifyGraphicsOverlayResult>> IdentifyGraphicsOverlaysAsync(PointF screenPoint, double tolerance, bool returnPopupsOnly)

Parameters

Type	Name	Description
Android.Graphics.PointF	screenPoint	The screen coordinates to identify the graphics.
System.Double	tolerance	A radius in device-independent pixels (DIP) that specifies how precise the identify operation should be.
System.Boolean	returnPopupsOnly	true includes only popups in the identify results. false includes both geoelements and popups in the identify results.

Returns

Type	Description
System.Threading.Tasks.Task<System.Collections.Generic.IReadOnlyList<IdentifyGraphicsOverlayResult>>	A task that represents the asynchronous identify operation on all graphics overlays in the view The value of the TResult parameter contains a read-only collection of IdentifyGraphicsOverlayResult in top to bottom order.

Remarks

Results are returned in the same order as the graphic overlays in the GraphicsOverlays collection.

As locations from user gestures are not always accurate to the exact pixel, you can define a tolerance for the identify operation. The tolerance parameter sets the radius of a circle, centered at the specified coordinates, in device-independent pixels (DIP). If the tolerance value is 0, identify performs the test at the specified coordinates. If it is greater than 0, identify tests inside the circle. For touch displays a value of 22 is recommended to cover an average finger tap. The maximum allowed value is 100 DIPs.

The returnPopupsOnly parameter controls which properties are populated in the IdentifyGraphicsOverlayResult instance. If true, only Popups is populated. If false, both Graphics and Popups are populated, if the overlay has popups.

Applies to

Platforms and versions

Target	Versions
.NET Android	200.3 - 200.5
Xamarin.Android	100.0 - 100.14

IdentifyGraphicsOverlaysAsync(PointF, Double, Boolean, Int64)

Identifies a limited number of graphics in all graphics overlays, at the given screen point.

Declaration

public async Task<IReadOnlyList<IdentifyGraphicsOverlayResult>> IdentifyGraphicsOverlaysAsync(PointF screenPoint, double tolerance, bool returnPopupsOnly, long maximumResultsPerOverlay)

Parameters

Type	Name	Description
Android.Graphics.PointF	screenPoint	The screen coordinates to identify the graphics.
System.Double	tolerance	A radius in device-independent pixels (DIP) that specifies how precise the identify operation should be.
System.Boolean	returnPopupsOnly	true includes only popups in the identify results. false includes both geoelements and popups in the identify results.
System.Int64	maximumResultsPerOverlay	The maximum number of graphics and/or popups returned in the IdentifyGraphicsOverlayResult per graphics overlay. A value of -1 indicates unlimited results.

Returns

Type	Description
System.Threading.Tasks.Task<System.Collections.Generic.IReadOnlyList<IdentifyGraphicsOverlayResult>>	A task that represents the asynchronous identify operation on all graphics overlays in the view The value of the TResult parameter contains a read-only collection of IdentifyGraphicsOverlayResult in top to bottom order.

Remarks

As locations from user gestures are not always accurate to the exact pixel, you can define a tolerance for the identify operation. The tolerance parameter sets the radius of a circle, centered at the specified coordinates, in device-independent pixels (DIP). If the tolerance value is 0, identify performs the test at the specified coordinates. If it is greater than 0, identify tests inside the circle. For touch displays a value of 22 is recommended to cover an average finger tap. The maximum allowed value is 100 DIPs.

The returnPopupsOnly parameter controls which properties are populated in the IdentifyGraphicsOverlayResult instance. If true, only Popups is populated. If false, both Graphics and Popups are populated, if the overlay has popups.

Results are returned in a top-to-bottom order.

Applies to

Platforms and versions

Target	Versions
.NET Android	200.3 - 200.5
Xamarin.Android	100.0 - 100.14