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Asynchronously identifies the visible graphics at the given screen point in all graphics overlays in this view.
As locations from user gestures are not always accurate to the exact pixel, a tolerance for the identify can be
defined. The tolerance parameter indicates the radius of a circle, centered at screenPoint, in
density-independent pixels (dp). The results returned will include any visible graphics that, when rendered
with the appropriate symbols, intersect this circle, up to the maximumResults parameter limit.
The identified graphic(s) are returned from IdentifyGraphicsOverlayResult.getGraphics(), subject to the
returnPopupsOnly parameter. If an overlay is an enabled PopupSource,
then the IdentifyGraphicsOverlayResult.getPopups() list for that overlay will also contain pop-ups.
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