Anyone managed to use android databinding with bin...

# multiplatform

[Mgj]

Anyone managed to use android databinding with binding to StateFlow or MutableStateFlow properties? I've created custom binding adapters before, but i cannot get it to work properly with StateFlows

[louiscad]

What doesn't work exactly?

[Mgj]

I couldnt get two-way binding to work. Usually you would have something like:

@InverseBindingAdapter(attribute = "flowText")
@JvmStatic
fun getText(view: MyEditText): String {
    return view.text.toString()
}

@BindingAdapter("flowText")
@JvmStatic
fun setText(view: MyEditText, newValue: String) {
    if (view.text.toString != newValue) {
        view.text = newValue
        view.textChangedListener?.onChange()
    }
}

@BindingAdapter("flowTextAttrChanged")
@JvmStatic
fun setListeners(
    view: MyEditText,
    attrChange: InverseBindingListener
) {
    view.textChangedListener = attrChange
}

But when replacing String with MutableStateFlow<String> the InverseBindingAdapter would never be called or used by the generated binding code

[Mgj]

I ended up just forcing two-way binding on it by subscribing to the StateFlow in the BindingAdapter and updating it with a TextWatcher 🤷 not really ideal but it seems to work

[Orhan Tozan]

Thats why I use LiveData, it has out of the box db support

[Mgj]

Right, i use LiveData for native android app's but for KMP i'd like to share the viewmodels between platforms... not possible with LiveData

[louiscad]

You have flow.asLiveData()

[Mgj]

But surely that cannot be used in common code right? I'd have to do that in the android code

[Orhan Tozan]

Yea, just like you use BindingAdapter

[Mgj]

Right. Hmm its an interesting option for sure, thanks

[Mgj]

@louiscad asLiveData is neat, but i cant seem to find a asMutableLiveData... Seems like i'd still have to make bindingAdapter-like code to enable two-way binding

[louiscad]

@Mgj You can make your own asMutableLiveData if you want.

[Mgj]

Should probably have made it more clear, its what i meant by "bindingAdapter-like code". Its still a cool idea but loses some of its appeal