The best way would be to pass a function from the ...

# android

[Francesco megna]

The best way would be to pass a function from the layout parent and in the layout of button i write “onClick=“@{onClickGenericMethod}“, but if i want to pass paramater this implementation not work

[nikolay]

but can’t you do android:onClick="@{() -> onClickGenericMethod(someParameter)}"?

[Francesco megna]

Maybe yes, the first question is which type i specify in the layout (<variable name=“onClickGenericMethod” type=“???“), the second question is “if i have i need to pass different paramater to the function called in the same button layout?

[nikolay]

sorry, I don’t really get your question. In my case I have ViewModel from which I’m using the click listener

[Francesco megna]

Don’t worry, thx, maybe i will post the question on stackoverflow with more info and code, i link you the question if you are curious

[nikolay]

yeah, would be nice to see more code

[nikolay]

just to get more context

[Francesco megna]

sure

[gildor]

You cannot pass onClickGenericMethod just as “method reference”

[gildor]

but you can pass it some interface with a single method and invoke this method

[gildor]

so instead

onClickGenericMethod(someParameter)

You can have something like

onClickGenericMethod.run(someParameter)

[Francesco megna]

Yes with interface i can but if I want to pass one parameter to the first button and different parameter to the second?

[Francesco megna]

My intent is to have Button component like React Button component, with data binding

[Francesco megna]

Or maybe with .run you mean to pass the onClickGenericMethod from the parent layout?

[gildor]

As I understand it work if your method and interface have compatible types, the same works for BindingAdapters

[gildor]

If you have simple sample project with this, I can try to show this approach there

[Francesco megna]

My actual project is for my company, but I can create a sample project in this weekend, I’m really curious of your tips

[Francesco megna]

Hey, this is a sample project https://github.com/FransiscoDot/AndroidDataBinding

[Francesco megna]

U can see the button layout used in in main_activity, the limitation is the method in the handlers

[gildor]

Looks like your project contains submodule databindingexample but no sources or url or this submodule

[gildor]

I changes one of my own samples for your case
Please take a look on branch reusable-binding
https://github.com/gildor/kotlin-android-sample/tree/reusable-binding

[gildor]

I prepared 2 samples how to solve your case:
this one looks like your sample
https://github.com/gildor/kotlin-android-sample/blob/reusable-binding/app/src/main/res/layout/button.xml

This one uses separate view model:
https://github.com/gildor/kotlin-android-sample/blob/reusable-binding/app/src/main/res/layout/button_model.xml

Usage of those approaches with my comments:
https://github.com/gildor/kotlin-android-sample/blob/reusable-binding/app/src/main/res/layout/content_main.xml#L36-L59

[gildor]

Also, one more thing. I use android.view.View.OnClickListener on button.xml, but this interface is not special, you can use any SAM interface with required signature, databinding allow you to use any method or interface with compatible signature, it’s how custom listeners for BindingAdapter works, binding compiler just check listener signature, not a type of used interface

[Francesco megna]

Thanks for the answer, when I’m at home I look your samples