Add ability to sort items on a Spinner widget

[f-odhiambo]

Use case:

The spinner widget picks the data from the database and then filters it into the dropdown items (in our case locations) using fhir-path expression - Dynamic answerExpression. The implementation for this was done here #2052. POst QA we have a requirement to view the listed items in an alphabetical order (a-z)/asc/desc or by ID

Requirement
Add the ability to sort items on a Spinner widget based on defined criteria

Sample Screenshots

[pld]

How are these being sorted for display now? If it's by an internal ID, is there a way we can control that for now (e.g. based on creation order) that can serve as a temporary work around?

[brandyodhiambo]

So the sorting ability should be added here on the file DropDownViewHolderFactory
on this answerOptionList

  val answerOptionList =
          this.questionnaireViewItem.enabledAnswerOptions
            .map {
              DropDownAnswerOption(
                it.value.identifierString(context),
                it.value.displayString(context),
                it.itemAnswerOptionImage(context),
              )
            }
            .toMutableList()
        answerOptionList.add(
          0,
          DropDownAnswerOption(
            context.getString(R.string.hyphen),
            context.getString(R.string.hyphen),
            null,
          ),
        )

[jingtang10]

Closing with the same rationale as #2410. @f-odhiambo if you still need this please reopen and add rationale.

[jingtang10]

@f-odhiambo @pld just for your context - I commented in the other issue that sorting is not a behaviour well defined in the spec. I think we should respect whatever order that is provide after answer options have been resolved. we can however, define a custom extension and publish it if it's indeed what we need. please feel free to reopen if that's what you want to do.

[jingtang10]

How are these being sorted for display now? If it's by an internal ID, is there a way we can control that for now (e.g. based on creation order) that can serve as a temporary work around?

sorry missed this - we don't change the order at all, so if the locations are in a value set this would just be the order of the values in the valueset.