Data Binding with LiveData (Two-way & One-way) - Android Kotlin Tutorial
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- เผยแพร่เมื่อ 18 ก.ย. 2024
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Managing the layout programmatically can be quite time consuming and verbose on Android. Even though Kotlin spares you of calling findViewById, accessing views in the activity code can still get ugly. When you use data binding, you can do most of the UI related stuff right in the XML layouts.
With LiveData, data binding becomes even more powerful and simple to use. While you could create observable fields even in the past when LiveData didn't exist, this new life-cycle aware observable makes data binding even better and simpler.
In this tutorial you are going to learn how to use one-way and two-way data binding with LiveData and MVVM architecture.
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What is two-way data binding? 10:37 - 11:02 .Thank you for the awesome tutorial.
Greeting from Russia! One of the best tutorials I have ever seen!!! The best wishes!
I like your explanation style. I couldn't quite get the repository to build, but I was able to transplant the code into another project and run it. I watched quite a lot of videos on two-way binding and read a lot of tutorials, but yours was the clearest and had code I could use. I'll be looking for other topics, like recycleview with databinding, preferably in Kotlin.
it is clear an d a calming voice.
Greeting from Myanmar! Great tutorials... Wish you get more and more subscribers and keep doing that kind of great tutorials!
Thank you and God bless you for making this helpful tutorial!
been struggling for this thing for days. missing .value and now it work. thanks
Amazing! You are a great teacher
I'm a big fan of your tutorials)) Also, I've added one more imageView in the XML and created a Binding Adapter. Using that, I'm loading an image using Glide. And for the image URL, I've created an Object, where I store my URL. Then I imported that Constants Object inside XML as and used the URL inside that object to load the image.
Clear and concise tutorial, thanks from Brazil!
Thanks for the information about MutableLiveData for two way data binding.
Great tutorial
Thanks for making this video. You explain this concept excellently! Just perfect.
Awesome video bro, also can you please create playlists on android tutorials.
THANK YOU VERY MUCH!!!!!!!!
Perfect! Just what I needed.
Thanks man , nice video 👍
I really wanna know which theme of android studion you are using! It looks awesome
Thank you so much your tutorials are so great.
Is it even needed to use databinding while using kotlin? Woopsies, ur vid description answers my questions
Great tutorial , 2w binding is awesome
Great tutorial.Thanks for the help .
Amazing, thats all i need) thanks
Thank you for your tutorial, it was so clear
Hy i just waanna know that displaying image with glide is a two way binding or not
Great tutorial, thank you
e: error: Bindable must be on a member in an Observable class. MainViewModel is not Observable
please help
Remove `@Bindable` annotation. `@Bindable` is used with `Observable`. It'll work.
Bindable must be on a member in an Observable class. I get this error.
Extend observer class
new sub ;) ur dope bro keep it up
Good Tutorial but i got an error illegal character at index 0 android
which theme you are using
thank you and autosubscribe after watch this excellent tutorial
Amazing channel, please keep doing this!!
Thank you! I'm not planning to stop anytime soon 😉
Remove @Bindable from ViewModel's MutableLiveData field. It's redundant and causes compile time exceptions.
thanks a lot
Thank you for your great tutorials! I noticed you are using AndroidX package which I had no idea what it was until your tutorial :)
Now that this AndroidX package is 1.0.0 production ready as of 21st September, is it recommended to use these over the android.support* packages? Reason I'm also asking is because when using @Bindable in ViewModel the compiler complains about the class not being of Observable which I suspect there may be changes in the new AndroidX package that I'm yet to try to see if it resolves this error...
Oh yes! AndroidX is the new android.support. It may be the case that the new ViewModel implements Observable.
@@ResoCoder Cheers! :) Thanks again for your great content! :)
Hi , I have just one doubt , if we have a dataclass having 2 field name and address and that is intialised with Live data then how can we achieve 2 way binding for that,
i can't next step in type="com.resocoder.databinding.MainViewModel" why??? can help me :(
7:20
Hi, could you please help me. When I try to bind mutablelivedata-string variable it works fine and I can observe any changes in the activity, however, when I try to bind mutablelivedata of custom model type, I am unable to observe any change to the value of the custom model attribute in my activity.
Your voice seems similar to Jiraiya from Naruto series. Only a bit lighter.
Great tutorial, thanks.
I have a question though, imagine we wanted to do something else besides modifying 'editTextContent'. For example store in the database every change (just theoretical example).
I don´t want an observer observe the field from the Activity, because this is a business action, nothing to do with the view.
How could i do this? Is it possible to customize the way the value is set, maybe with a setter method or similar?
@Reso Coder which version of android studio is you are using ?
How @bindable is working in viewmodel??....when I use same like your code ...it reflecting error.....same issue is raised in stackover flow ....no need to use @bindable just @={viewmodel.edittext} is enough...it will update edittext field in viewmodel.
Hello, thank you for a great video on data binding. Could you please tell me what Theme you are using, I really like it.
Material Theme UI
@@ResoCoder Thank you :)
I have an issue with @Bindable val editTextContent = MutableLiveData()
It gives me an error: Bindable must be on a member in an Observable class.
I have the same issue, I just noticed the use of the AndroidX package which is something new to me that I only found out about today. I'm wondering if ViewModel has changed in these new packages.
Actually it's not so much difficult to fix it. I've just created my own ObservableViewModel class which extends the Observable class, and used it in my viewmodel. Then it worked!
@@avaz.alimov Perfect! I'm interested to find out to see if this is what the new AndroidX package does :)
Its not necesari to annotate MutableLiveData with @Bindable, actually MutableLiveData it's not gonna change, just its value and Databinding cares about it
How to use focus listener on edit text and validate the data after loosing focus on edit text. Any Ideas?
Thank you, it was great tutorial , but.... how to start or navigate to another activity
How can I customize my android studio to look like yours?
Hi, can you tell me how did you configure that theme please?
thank you
The way of writing databing related code in the video is over complicated. 5:47 / 32:04
I'v been using ontextchangelistner all the time :/ I didn't know about the @={}. This saves alot of time and a lot cleaner. Dude you are a life saver
how to read ImageView from ViewModel?
becuase live data wont notifiy the ui if the image is changed
You're holding on to the same state - currentRandomFruitName - in two different places while trying to synchronise between them. There should be a law against that.
What color scheme are you using? ^.^
how to set spinner using two way data binding ?
Good Tutorial, i also use Studio 3.2, but your IDE looks Cool, Why ?
Thanks! I'm using this plugin: plugins.jetbrains.com/plugin/8006-material-theme-ui
Thank you !!! Also done by following www.material-theme.com/docs/getting-started/
Use diagrams to explain more clearly
I have a question related with the UI of your Android Studio, how can I implement that UI?
I have downloaded a plugin called "Material Theme UI" and I have chosen the "Material Darker" variant. I'm also using Consolas font because I don't like Fira Sans that comes packaged with the plugin.
thanks!!! By the way amazing channel, I just subscribed and clicked the bell icon!!!!
Thank you!
While textView presenting, you used LiveData instead of MutableLiveData. Why?
because you can only observe changes using Livedata
@@deepakbisht7764 thx
Every one will take only text view and edit text for data binding… no one used check box spinner and other important views along with text views
Pro tip: play the video in 1.25x speed!
downloaded the source code and it has too many errors in MainActivty.
I imported in latest android studio and goes well
its work but its not perfect
Warning... The two way data binding is broken. It creates extraneous callbacks.
This doesn't work anymore. I wasted my time
Good, but why would you use MutableLiveData if you think its unsafe. Why not teach people how to do the proper way instead of an unsafe way. Seems irresponsible...
It's only as unsafe as the programmer writing the code is irresponsible. There's no way around MutableLiveData when it comes to two-way data binding. That's because the data binding needs to "mutate" the data itself.
expose
you talk too much
Thanks!
Great tutorial. Thank you
You're welcome!