Hi how can I use an abstract class in databinding 3 2 0 beta kotlinlang #android

Channels

lincheck

kobweb

koalaql

kotlin-multiplatform-contest

osgi

brikk

revolver

tricity-kotlin-user-group

cincinnati-user-group

prozis-android-backup

refactoring-to-kotlin

russian-kotlinasfirst

androidgithubprojects

navigation-architecture-component

stayhungrystayfoolish

practical-functional-programming

tensorflow

swagger-gradle-codegen

kotlinultimatechallenge

competitive-programming

skia-wasm-interop-temp

java-to-kotlin-refactoring

event21-community-content

myndocs-oauth2-server

jvm-ir-backend-feedback

Title

rattleshirt

07/06/2018, 8:25 AM

Hi, how can I use an abstract class in databinding (3.2.0-beta02), it gives me a

Could not find accessor companyName

when using

android:text="@{data.invoice.companyName}"

(kotlin v1.2.51) with

abstract var companyName: String?

. In the kotlin bytecode I see a

getCompanyName()

method but that doesn’t work either

arekolek

07/06/2018, 8:31 AM

Maybe you have

data.getInvoice()

that is chosen over

data.invoice

and doesn't have the

companyName

. That was the problem here https://stackoverflow.com/questions/32683129/android-databinding-error-could-not-find-accessor

rattleshirt

07/06/2018, 9:14 AM

Doesn’t seem to be my case

gildor

07/06/2018, 9:15 AM

You can use abstract method, sure. Hard to see what is your problem, maybe you could to reproduce on some sampl

rattleshirt

07/06/2018, 9:16 AM

but also field?

gildor

07/06/2018, 9:16 AM

Databinding lib does the same what Kotlin, you can use `companyName`instead of

getCompanyName()

maybe your problem with invoice method

maybe invoice type doesn’t contain companyName property

rattleshirt

07/06/2018, 9:18 AM

This is what I have

abstract class InvoiceType {
    abstract var companyName: String?
}

interface AfterpayInvoice<T : InvoiceType> {
    var invoice: T
}

with

data class Invoice(@PrimaryKey
    var orderNumber: String,
    override var companyName: String?
) : InvoiceType()

class InvoiceWithDetails : AfterpayInvoice<Invoice> {
    @Embedded
    override lateinit var invoice: Invoice
}

It can find the invoice

It probably doesn’t know the type of invoice yet because of the generic

gildor

07/06/2018, 9:36 AM

Yes, generic can be a problem

rattleshirt

07/06/2018, 9:37 AM

It is 😞

interface AfterpayInvoice<T : InvoiceType> {
    var invoice: T

    fun getterForInvoice() : InvoiceType
}

this seems to work

gildor

07/06/2018, 9:59 AM

You can fix it by using non-generic version of your

data

so instead type of your ViewModel SomeData<InvoiceType> (or how does it work) You can use

class InvoiceSomeData : SomeData<InvoiceType>

rattleshirt

07/06/2018, 10:15 AM

Sorry, I don’t follow

gildor

07/06/2018, 10:49 AM

It can be a problem of type check with generic on compile time and because of type erasure you cannot use model with generic, I saw something similar, so to fix this you can use ViewModel without generic param

#android Join Slack