Create a custom View/ViewGroup class in Anko DSL

问题:

I want to create a custom View which is just a wrapper of some Android Views. I looked into creating a custom ViewGroup which manages the layout of it's child views, but I don't need such complexity. What I basically want to do is something like:

class MainActivity
verticalLayout {
  textView {
    text = "Something that comes above the swipe"
  }
  swipeLayout {
  }
}

class SwipeLayout
linearLayout {
  textView {
    text = "Some text"
  }
  textView {
    text = "Another text"
  }
}

The reason is that I'd like to move the SwipeLayout code into a separate file but don't want to do any complex layout stuff myself. Is this possible using Anko?

Edit: As suggested, Is it possible to reuse a layout in Kotlin Anko solves this problem if the view is a root layout. But as shown in the example, I'd like to include this within another layout. Is that possible?

回答1:

you can use ViewManager.

fun ViewManager.swipeLayout() = linearLayout {
  textView {
    text = "Some text"
  }
  textView {
    text = "Another text"
  }
}

---

class MainActivity
  verticalLayout {
    textView {
      text = "Something that comes above the swipe"
    }
    swipeLayout {}
}

回答2:

I was looking for something like this too, but the most optimal solution i found for custom views is something like this:

public inline fun ViewManager.customLayout(theme: Int = 0) = customLayout(theme) {}
public inline fun ViewManager.customLayout(theme: Int = 0, init: CustomLayout.() -> Unit) = ankoView({ CustomLayout(it) }, theme, init)

class CustomLayout(c: Context) : LinearLayout(c) {
    init {
        addView(textView("Some text"))
        addView(textView("Other text"))
    }
}