Hello I m trying to use com shopify livedataktx MutableLiveD kotlinlang #android

Channels

100daysofkotlin

100daysofkotlin-2021

algolialibraries

android-architecture

android-databinding

androidgithubprojects

androidx-xprocessing

arrow-contributors

beepiz-libraries

cincinnati-user-group

codemash-precompiler

codingconventions

competitive-programming

competitivecoding

compose-android

compose-desktop

compose-ui-showcase

connect-audit-events

cscenter-course-2016

domain-driven-design

effective-kotlin

effectivekotlin

embedded-kotlin

event21-community-content

fb-internal-demo

fluid-libraries

framework-elide

getting-started

github-workflows-kt

graviton-browser

image-processing

intellij-plugins

intellij-tricks

introduce-yourself

java-to-kotlin-refactoring

jhipster-kotlin

jvm-ir-backend-feedback

k2-early-adopters

kotest-contributors

kotlin-by-example

kotlin-data-storage

kotlin-foundation

kotlin-in-action

kotlin-multiplatform-contest

kotlin-pakistan

kotlinforbeginners

kotlingforbeginners

kotlinprogrammers

kotlintest-devs

kotlinultimatechallenge

kotlinx-datetime

lambdaworld_cadiz

language-evolution

language-proposals

leedskotlinusergroup

library-development

machinelearningbawas

myndocs-oauth2-server

navigation-architecture-component

ohio-kotlin-users

pattern-matching

pocketgitclient

practical-functional-programming

prozis-android-backup

python-contributors

realworldkotlin

refactoring-to-kotlin

refreshversions

russian-kotlinasfirst

skia-wasm-interop-temp

sofl-user-group

spring-security

squarelibraries

stayhungrystayfoolish

strife-discord-lib

swagger-gradle-codegen

swiss-user-group

tricity-kotlin-user-group

Title

m

melatonina

11/26/2019, 12:05 AM

Hello. I'm trying to use com.shopify.livedataktx.MutableLiveDataKtx to avoid the invasion of nullables and !! in kotlin code using ViewModel. How do you make a two-way binding with that kind of MutableLiveDataKtx?

r

rkeazor

11/26/2019, 1:45 AM

probably the same way you use liveData

But its only nullable,because of platform type, dont see the big deal really

m

melatonina

11/26/2019, 8:34 AM

@rkeazor it is a big deal: it introduces null everywhere.

@rkeazor In order to perform a two-way binding with MutableLiveDataKtx I had to use a binding converter. This triggers a NPE at compile-time. https://gist.github.com/mel4tonin4/05451ba80aca392caf12f661cc71b431

I have no idea of how to debug that. Do you see where the problem is?

r

rkeazor

11/26/2019, 12:04 PM

Isnt MutableLiveDataKtx a child of LiveData

You shouldnt have to do that

Just when you bind it remember to bind the lifecycle owner as well

There is something werid about your inverse binding adapter. But before you do that ,Make MutableLivrDataKtx extend mutableLiveData. Not livedata. It should work out the box with 2 way data binding

m

melatonina

11/26/2019, 1:00 PM

I'll look into that. I didn't write MutableLiveDataKtx. No idea why they subclassed LiveData

MutableLiveDataKtx subclassed LiveDataKtx and makes the mutating methods public, just like MutableLiveData does with LiveData.

r

rkeazor

11/26/2019, 1:15 PM

Does LiveDataKtx subclass livedata

I say just use MutableLiveData

It's not as big of deal as you think it is lol. The wrapper, isnt anything special

m

melatonina

12/17/2019, 12:18 AM

Thanks, Robert.

7 Views

#android Join Slack