Use annotation sublayers to gain finer control of annotation layer subtypes.
Use case
Annotation, which differs from labels by having a fixed place and size, is typically only relevant at particular scales. Annotation sublayers allow for finer control of annotation by allowing properties (like visibility in the map and legend) to be set and others to be read (like name) on subtypes of an annotation layer.
An annotation dataset which marks valves as "Opened" or "Closed", might be set to display the "Closed" valves over a broader range of scales than the "Opened" valves, if the "Closed" data is considered more relevant by the map's author. Regardless, the user can be given a manual option to set visibility of annotation sublayers on and off, if required.
How to use the sample
Start the sample and take note of the visibility of the annotation. Zoom in and out to see the annotation turn on and off based on scale ranges set on the data.
Use the checkboxes to manually set "Open" and "Closed" annotation sublayers visibility to on or off.
How it works
Load a MobileMapPackage that contains AnnotationSublayer.
Get the sublayers from the map package's layers by calling sublayer.subLayerContents[i].
You can toggle the visibility of each sublayer manually by setting the sublayer.visible property.
To determine if a sublayer is visible at the current scale of the MapView, use sublayer.isVisibleAtScale(), by passing in the map's current scale.
Relevant API
AnnotationLayer
AnnotationSublayer
LayerContent
Offline Data
Read more about how to set up the sample's offline data here.