From Any to correct type

1

My class looks like this

class somethins(ele:Any){
      /*ele could be any type of View. TextView, ImageView, Editable and so on i would like do something like*/
    var element=ele as typeOf(ele)
}

But how can i achieve that? Reflection wont work because of type Any

2

If you want to get the type and then work with this type statically, it is impossible in principle. Type is not known in compile time. If you want to do a dynamic dispatch, then use standard idiom:

when(element){
  is A -> doSomethingWithA()
  is B -> doSomethingWithB()
  else -> error()
}
1 Like
3

Thanks, but gave me an error while coding


class somethins(ele:Any){
when(ele){ //<- ERROR Expecting member declaration
    //Everything is in red error waves
}
}
4

I can’t help you with a syntactic problem when you do not give any input. Please read the appropriate documentation section.

1 Like
5

I wrote an animation class.
So that class should (e.G.) move givenElement.x=200f

But because i create my Views dynamically with different types (TextView, Buttons, ImageViews and so on)
i have pass type Any to my class (Because, could be Any)

But with “Any”, there is no ele.x (x is red and unassigned)

An i really hope that there is a way to not do the whole class for each Type

6

And about input. I stopped writing anything within when, because it came errorred while typing “when(ele){}”

7

It would even help me if there is a solution to pass it from outside the class

E.g.
[class]
class forAnimation{
var ele:Any?=null
}
var cl:forAnimation = forAnimation()
cl.ele=myImageView
[/class]

But it’s not working either. Giess it’s as you said. Not possible in a strict language. Compiler need to know beforehand

8

EDIT: SOLVED

class something(ele:View){
var element=ele

//element.x is available
}
9

It would help if you gave us code examples. To do that, start a single line with three back ticks followed by run-kotlin. :

```run-kotlin
interface View {
val x: Float
}
class A (ele: View)
```

class View {
  val x: Float = 0f
}
class A (ele: View) 

fun main() {
  val a = A(View())
}
10

Actually View isn’t a class. It’s a given Type of kotlin. “TextView,Button,Editable,View” and so on. Basically everything can be catched from layout

View is the general one (one size fits all) if i had a good understanding of it

Completely wrong: see @al3c 's post below

1 Like
11

You seem a bit confused about class and types, View is a class:

Also it has not much to do with Kotlin itself, it’s defined by the android framework, which is made by Google.

2 Likes
12

Ah, okay. Thank you for that.

The only thing i know, that i don’t have to write a class View. So it seems to be a predefined class of google.
However. If im right, it does exactly what i need.

And as im usinig Kotlin for Android app developement only, should be my choice, right?

1 Like