Android I am attaching the same `textChangedListener` to mul

Question

Android I am attaching the same `textChangedListener` to multiple input fields Currently I have this ``` withdraw input textChangedListener afterTextChanged validateInput reg number textChangedListener afterTextChanged validateInput ``` I cannot figure out how to extract the listener to a variable and then re use it instead of defining the same listener multiple times I guess it s just a syntax issue thinking face Any hints slightly smiling face

karelpeeters · Answer

Do you happen to use some Kotlin library for this `EditTest textChangedListener` doesn t exist for me

karelpeeters · Answer

Maybe it s even a builder because that `afterTextChanged` doesn t look like function override syntax to me

Mathias Brandt · Answer

Don t think so I m not too good at the super short Kotlin syntax yet so I m actually not even sure what I m doing

karelpeeters · Answer

Can you `ctrl+B` go to definition on that function

Mathias Brandt · Answer

It s defined in `ListenersWithCoroutines kt`

karelpeeters · Answer

You re using `anko` then slightly smiling face

Mathias Brandt · Answer

Oh that s an external library

Mathias Brandt · Answer

Didn t start this project so I was not aware

karelpeeters · Answer

Yea it s a util library from jetbrains for android and kotlin

Mathias Brandt · Answer

Oh okay smile

karelpeeters · Answer

So yea there s some DSL trickery going on

Mathias Brandt · Answer

Yep Probably gonna try a solution without anko then

Mathias Brandt · Answer

Gotta know what s going on before using the magic tools

karelpeeters · Answer

```fun textChangedListener context CoroutineContext = UI init TextWatcher gt Unit android text TextWatcher = TextWatcher context apply init ```

karelpeeters · Answer

If you put that somewhere then you can create a variable `listener = textChangedListener ` and reuse that

Mathias Brandt · Answer

What if I want to do it without the coroutines stuff something like Shawn is suggesting

Mathias Brandt · Answer

so basically an anon inner class

karelpeeters · Answer

```val listener = object TextWatcher override fun afterTextChanged s Editable override fun beforeTextChanged s CharSequence start Int count Int after Int override fun onTextChanged s CharSequence start Int before Int count Int editText addTextChangedListener listener ```

karelpeeters · Answer

That s going to be ugly

Mathias Brandt · Answer

Hmm yes I liked the solution I made because I only had to override a single function from TextWatcher

karelpeeters · Answer

Right that s kinda the point of using anko makes everything way more elegant

karelpeeters · Answer

You can just use the snippet I posted above to do about the same

Mathias Brandt · Answer

Yes I will probably do that even though I find that code confusing as well

karelpeeters · Answer

You only need the function once just hide it somewhere in a Util kt file stuck out tongue

karelpeeters · Answer

If you want to know what s going on read <https kotlinlang org docs reference type safe builders html>

Mathias Brandt · Answer

Haha never speak of it again I like that

Mathias Brandt · Answer

It says conflicting declarations

Mathias Brandt · Answer

val listener TextWatcher and val listener TextWatcher gt Unit

karelpeeters · Answer

What line gives that error message Maybe a sceenshot

Mathias Brandt · Answer

Oh never mind had some other old code that didnt compile

karelpeeters · Answer

Yea that s what I figured slightly smiling face

Mathias Brandt · Answer

It s been a long day I really appreciate your help slightly smiling face

karelpeeters · Answer

My pleasure

Mathias Brandt · Answer

Okay so I ve defined the listener as you said but cannot figure out how to attach it to the view thinking face

Mathias Brandt · Answer

Oh just had to call addTextChangedListener Right makes sense

Mathias Brandt · Answer

Okay I think I ve the right solution now even though I m still not sure what s going on I have an idea though wink Will look at the link you provided Thanks again for your help slightly smiling face

karelpeeters · Answer

I d say read trough the entire reference if you find the time it s really good

karelpeeters · Answer

Good luck

Mathias Brandt · Answer

Thanks slightly smiling face