literal with array or listOf does not work

[tobias-r]

Environment

Android SDK 11.3.1

Observed behavior and steps to reproduce

iconTranslate(
   Expression.switchCase(
   Expression.eq(Expression.get("has-icon"), Expression.literal(true)),
   Expression.literal(listOf(7.0,7.0)),
   Expression.literal(listOf(7.0,7.0))
))

Notes / preliminary analysis

This code gives me the error: Cannot access 'literal': it is internal in 'Companion' It makes sense, but how else should I do it then?

Apparently this has been a bug in SDK 10 before (there is a Github bug ticket) and it is supposed to be fixed.

Any help?

[pengdev]

@tobias-r please try with array expression instead of constructing a list literal

[tobias-r]

You mean this way? Then the app crashes with the following error:

com.mapbox.maps.MapboxStyleException: Add layer failed: Failed to set icon-translate property for count layer. Error: [2][1]: The item type argument of "array" must be one of string, number, boolean

val arrayExpressionWithIcon = Expression.array(
    Expression.literal(10.0),
    Expression.literal(-10.0)
)
val arrayExpressionWithoutIcon = Expression.array(
    Expression.literal(6.0),
    Expression.literal(-6.0)
)

iconTranslate(
    Expression.switchCase(
    Expression.eq(Expression.get("has-icon"), Expression.literal(true)),
    arrayExpressionWithIcon,
    arrayExpressionWithoutIcon
))

[pengdev]

Hey @tobias-r , I tried to replicate your expression as follows using Expression DSL and it works as expected:

import com.mapbox.maps.extension.style.expressions.dsl.generated.*

switchCase {
  eq {
    get("has-icon")
    literal(true)
  }
  literal(listOf(0.7, 0.7))
  literal(listOf(0.7, 0.7))
}

however, it seems like iconTranslate is a constant data type and doesn't support data driven expressions(e.g. get expression)

[tobias-r]

Ok, got it, that's the reason then. Could you maybe change this in a future release?

I am using this in a cluster layer and not all the features have the same size. So i need to move the little bubble with the cluster count to different positions, depending on the size of the cluster. One that has an icon => "has-icon" and one that doesn't. It seems currently impossible or am I wrong?

Thanks very much for the feedback, I appreciate it!