Android mvvm livedata and databinding
I am experimenting the new architecture components from Google trying to achieve more reactive code using ViewModel, LiveData and DataBinding.
Basically my idea around ViewModel is to have only one field of type Model(user for the record since we are representing a user profile scree). So my ViewModel class is :
class ViewModel : ViewModel() {
var model = MutableLiveData<User>()
and my Model class is :
class User(var name: String, var lastName: String, var age: Int)
In my layout file, I am trying to bind the fields on my Model into the view using DataBinding plugin. The problem is that since my ViewModel has a MutableLiveData<User> I can't access (from xml binding) the fields inside the User class (name, lastName...).
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="viewModel"
type="com.github.andromedcodes.mvvmtutorial.ViewModel" />
</data>
<RelativeLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/text_holder"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="@{viewModel.user.name}"/>
</RelativeLayout>
</layout>
Is it even possible to do that? And which is better, having a ViewModel with separate Fields (String, Int, Whatever...) or re-using a Model?
android mvvm android-databinding 
android-architecture-components android-livedata asked Nov 22 at 22:51
mohamed aouled issa
429416
|
show 4 more comments
I am experimenting the new architecture components from Google trying to achieve more reactive code using ViewModel, LiveData and DataBinding.
Basically my idea around ViewModel is to have only one field of type Model(user for the record since we are representing a user profile scree). So my ViewModel class is :
class ViewModel : ViewModel() {
var model = MutableLiveData<User>()
and my Model class is :
class User(var name: String, var lastName: String, var age: Int)
In my layout file, I am trying to bind the fields on my Model into the view using DataBinding plugin. The problem is that since my ViewModel has a MutableLiveData<User> I can't access (from xml binding) the fields inside the User class (name, lastName...).
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="viewModel"
type="com.github.andromedcodes.mvvmtutorial.ViewModel" />
</data>
<RelativeLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/text_holder"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="@{viewModel.user.name}"/>
</RelativeLayout>
</layout>
Is it even possible to do that? And which is better, having a ViewModel with separate Fields (String, Int, Whatever...) or re-using a Model?
android mvvm android-databinding android-architecture-components android-livedata asked Nov 22 at 22:51
mohamed aouled issa
429416
you should be able to access those fields on your xml layout. are you getting any errors?
– takecare
Nov 23 at 0:02
Yes i get a data accessor error when i write something like android:text="@{viewModel.user.name}"
– mohamed aouled issa
Nov 23 at 0:04
can you paste your xml layout here? are you declaring your viewmodel under the <data> element?
– takecare
Nov 23 at 0:10
Absolutely! all the variables are under <data> tag. I will edit my post with my xml layout.
– mohamed aouled issa
Nov 23 at 0:12
2
from your view model code, i think you should haveandroid:text="@{viewModel.model.name}"(or changemodelon yourViewModeltouser)
– takecare
Nov 23 at 0:17
|
show 4 more comments
I am experimenting the new architecture components from Google trying to achieve more reactive code using ViewModel, LiveData and DataBinding.
Basically my idea around ViewModel is to have only one field of type Model(user for the record since we are representing a user profile scree). So my ViewModel class is :
class ViewModel : ViewModel() {
var model = MutableLiveData<User>()
and my Model class is :
class User(var name: String, var lastName: String, var age: Int)
In my layout file, I am trying to bind the fields on my Model into the view using DataBinding plugin. The problem is that since my ViewModel has a MutableLiveData<User> I can't access (from xml binding) the fields inside the User class (name, lastName...).
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="viewModel"
type="com.github.andromedcodes.mvvmtutorial.ViewModel" />
</data>
<RelativeLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/text_holder"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="@{viewModel.user.name}"/>
</RelativeLayout>
</layout>
Is it even possible to do that? And which is better, having a ViewModel with separate Fields (String, Int, Whatever...) or re-using a Model?
android mvvm android-databinding android-architecture-components android-livedata asked Nov 22 at 22:51
mohamed aouled issa
429416
I am experimenting the new architecture components from Google trying to achieve more reactive code using ViewModel, LiveData and DataBinding.
Basically my idea around ViewModel is to have only one field of type Model(user for the record since we are representing a user profile scree). So my ViewModel class is :
class ViewModel : ViewModel() {
var model = MutableLiveData<User>()
and my Model class is :
class User(var name: String, var lastName: String, var age: Int)
In my layout file, I am trying to bind the fields on my Model into the view using DataBinding plugin. The problem is that since my ViewModel has a MutableLiveData<User> I can't access (from xml binding) the fields inside the User class (name, lastName...).
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="viewModel"
type="com.github.andromedcodes.mvvmtutorial.ViewModel" />
</data>
<RelativeLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/text_holder"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="@{viewModel.user.name}"/>
</RelativeLayout>
</layout>
Is it even possible to do that? And which is better, having a ViewModel with separate Fields (String, Int, Whatever...) or re-using a Model?
android mvvm android-databinding android-architecture-components android-livedata android mvvm android-databinding android-architecture-components android-livedata asked Nov 22 at 22:51
mohamed aouled issa
429416
asked Nov 22 at 22:51
mohamed aouled issa
429416
edited Nov 23 at 0:13
asked Nov 22 at 22:51
mohamed aouled issa
429416
asked Nov 22 at 22:51
mohamed aouled issa
429416
asked Nov 22 at 22:51
mohamed aouled issa
429416
429416
you should be able to access those fields on your xml layout. are you getting any errors?
– takecare
Nov 23 at 0:02
Yes i get a data accessor error when i write something like android:text="@{viewModel.user.name}"
– mohamed aouled issa
Nov 23 at 0:04
can you paste your xml layout here? are you declaring your viewmodel under the <data> element?
– takecare
Nov 23 at 0:10
Absolutely! all the variables are under <data> tag. I will edit my post with my xml layout.
– mohamed aouled issa
Nov 23 at 0:12
2
from your view model code, i think you should haveandroid:text="@{viewModel.model.name}"(or changemodelon yourViewModeltouser)
– takecare
Nov 23 at 0:17
|
show 4 more comments
you should be able to access those fields on your xml layout. are you getting any errors?
– takecare
Nov 23 at 0:02
Yes i get a data accessor error when i write something like android:text="@{viewModel.user.name}"
– mohamed aouled issa
Nov 23 at 0:04
can you paste your xml layout here? are you declaring your viewmodel under the <data> element?
– takecare
Nov 23 at 0:10
Absolutely! all the variables are under <data> tag. I will edit my post with my xml layout.
– mohamed aouled issa
Nov 23 at 0:12
2
from your view model code, i think you should haveandroid:text="@{viewModel.model.name}"(or changemodelon yourViewModeltouser)
– takecare
Nov 23 at 0:17
you should be able to access those fields on your xml layout. are you getting any errors?
– takecare
Nov 23 at 0:02
you should be able to access those fields on your xml layout. are you getting any errors?
– takecare
Nov 23 at 0:02
Yes i get a data accessor error when i write something like android:text="@{viewModel.user.name}"
– mohamed aouled issa
Nov 23 at 0:04
Yes i get a data accessor error when i write something like android:text="@{viewModel.user.name}"
– mohamed aouled issa
Nov 23 at 0:04
can you paste your xml layout here? are you declaring your viewmodel under the <data> element?
– takecare
Nov 23 at 0:10
can you paste your xml layout here? are you declaring your viewmodel under the <data> element?
– takecare
Nov 23 at 0:10
Absolutely! all the variables are under <data> tag. I will edit my post with my xml layout.
– mohamed aouled issa
Nov 23 at 0:12
Absolutely! all the variables are under <data> tag. I will edit my post with my xml layout.
– mohamed aouled issa
Nov 23 at 0:12
2
2
from your view model code, i think you should have
android:text="@{viewModel.model.name}" (or change model on your ViewModel to user)– takecare
Nov 23 at 0:17
from your view model code, i think you should have
android:text="@{viewModel.model.name}" (or change model on your ViewModel to user)– takecare
Nov 23 at 0:17
|
show 4 more comments
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you should be able to access those fields on your xml layout. are you getting any errors?
– takecare
Nov 23 at 0:02
Yes i get a data accessor error when i write something like android:text="@{viewModel.user.name}"
– mohamed aouled issa
Nov 23 at 0:04
can you paste your xml layout here? are you declaring your viewmodel under the <data> element?
– takecare
Nov 23 at 0:10
Absolutely! all the variables are under <data> tag. I will edit my post with my xml layout.
– mohamed aouled issa
Nov 23 at 0:12
2
from your view model code, i think you should have
android:text="@{viewModel.model.name}"(or changemodelon yourViewModeltouser)– takecare
Nov 23 at 0:17