how can get attribute view in xml from viewModel

Question

I have a 3 files(Activity, ViewModel,XML)

I use MVVM and connect XML to ViewModel.

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <data>
        <variable
            name="viewModel"
            type="com.example.MainViewModel"/>
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <androidx.appcompat.widget.AppCompatTextView
            android:id="@+id/priceTv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@={viewModel.price}"/>
        
    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

ViewModel.class

open class MainViewModel : ViewModel() {

    val price = MutableLiveData<String>()
    val priceTextViewWidth = MutableLiveData<Int>()

}

and in the activity, I connect XML to view model with

 binding.viewModel = viewModel

I can update Textview with change price variable in View Model but I need to pass TextView width to priceTextViewWidth in ViewModel.

I need to pass TextView width to priceTextViewWidth in ViewModel. so you want to set the variable in the ViewModel as equal to the View width? Can I ask why? Also does this help? — Stachu
– Stachu, Commented Aug 18, 2020 at 9:14
because in ViewModel I need to the width text view for a logic code — Rasoul Miri
– Rasoul Miri, Commented Aug 18, 2020 at 10:03
I don't think you can do that without involving Activity. What's the logic that requires it? I find it surprising that the way something is displayed affects the business logic — Stachu
– Stachu, Commented Aug 18, 2020 at 10:40

Abhimanyu · Accepted Answer · 2020-08-18 09:12:39Z

1

Replace :

android:layout_width="wrap_content"

with

android:layout_width="@{viewModel.priceTextViewWidth}"

answered Aug 18, 2020 at 9:12

Abhimanyu

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4 Comments

Rasoul Miri Over a year ago

I need to use android:layout_width to wrap_content value and get size in view model

Rasoul Miri Over a year ago

I need to detect if width change in XML , view model detect

Abhimanyu Over a year ago

So your question is to get the dimensions of the textview in the inflated layout?

Rasoul Miri Over a year ago

yes, but I won't pass these dimensions from activity to view model. I like to from XML to view model directly

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