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androidkotlindata-binding

BindingAdapter for Numberpicker

I'm implementing a "Wheel picker" using NumberPicker as explained in this SO answer.

I'm also using data binding and trying to populate the view at the XML.

Here is what I've done:

    @BindingAdapter("maxValue")
internal fun NumberPicker.customSetMaxValue(max: Int){
  maxValue = max
}

@BindingAdapter("minValue")
internal fun NumberPicker.customSetMinValue(min: Int){
  minValue = min
}

@BindingAdapter("values")
internal fun NumberPicker.customSetDisplayedValues(data: List<String>){
  displayedValues = data.toTypedArray()
}

<NumberPicker
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:entries="@array/dosage_type"
          app:maxValue="2"/>

Despite of this, I get: error: attribute maxValue (aka com.company.project.dev:maxValue) not found

What am I doing wrong?

Solution

  • I'm using app:maxValue="2"

    That is not a binding expression. Even if your value is a constant, you need to have it be in a binding expression:

    app:maxValue="@{2}"