The use case is having a DatabindingAdapter that changes the Drawable color of a viewHolder item accordingly.
@BindingAdapter("setBackgroundColor")
fun setColor(imageView: ImageView, id: String) {
imageView.background =
(ContextCompat.getDrawable(
imageView.context,
R.drawable.background_corner_right
) as LayerDrawable?)?.run {
imageViewBackground =
(findDrawableByLayerId(R.id.corneredDrawable) as GradientDrawable)
.apply {
mutate()
}
this
}
imageViewBackground?.setColor(Color.parseColor(id))
}
and in the XML part :
<ImageView
android:id="@+id/iv_color"
android:layout_width="50dp"
android:layout_height="30dp"
setBackgroundColor="@{contractType.color}"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintHorizontal_bias="0.0"/>
This works just fine ,but i want optimise more by not explicitly call findDrawableByLayerId,neither R.drawable.background_corner_right
is there anyway i can pass those in Xml and into the BindingAdapter as parameters ? this would make the BindingAdapter more generic and reusable
Turns out that i can access my DrawableLayer in the layer listed by its index ,so (findDrawableByLayerId(R.id.corneredDrawable) as GradientDrawable) get replaced by (findDrawableByLayerId(getId(0)) as GradientDrawable)
as for the background itself, i added it to the XML and called it by (imageView.background as LayerDrawable)
resolved.