How to set app: backgroundTint using Android Databinding LiveData

Question

val inputUnderLineColor = MutableLiveData(R.color.red2)

app:backgroundTint="@{viewModel.inputUnderLineColor}"

I want to set the EditText UnderLine color value depending on the state, but I get the following error

Cannot find a setter for <android.widget.EditText app:backgroundTint> that accepts parameter type 'androidx.lifecycle.MutableLiveData<java.lang.Integer>'

How do you solve this ??

Answer 1

You can use it like below ContextCompat.getColor()

 <layout>
         <data>
                <import type="android.support.v4.content.ContextCompat"/>
                <variable name="viewModel" type="com.example.myapp.yourObject" />
            </data>
        ...
         <EditText 
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@{data.text}"
                android:textColor="@{ContextCompat.getColor(context, viewModel.inputUnderLineColor)}" />
    </layout>

1. Make sure to import ContextCompat as shown above.

2. You can automagically 'context' as a method parameter for ContextCompat.getColor() because it will be automatically resolved to the view's context.