我可以推断委托中的属性类型吗？

Question

I have this code. It will findViewById with a delegate.

val backgroundImage: ImageView by lazy { view<ImageView>(R.id.item_component_section_background) }

fun <T: View> view(id : Int) : T {
    val view : View = findViewById(id) ?: throw IllegalArgumentException("Given ID could not be found in current layout!")

    @Suppress("UNCHECKED_CAST")
    return view as T
}

Is there any way to remove the view<ImageView> for something like view in the lazy-block? Can I get or infer the type of the property in the function view() ?

Answer 1

You can have

val backgroundImage by lazy { view<ImageView>(R.id.imageView) }

or

val backgroundImage by lazy<ImageView> { view(R.id.imageView) }

Note that in both cases the type of backgroundImage is inferred from the right hand side expression type.