I am trying to replicate this answer: Setting attribute of child element of included layout
I have a simple custom_edit_text.xml:
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable name="hint123" type="String" />
</data>
<android.support.design.widget.TextInputLayout
android:id="@+id/emailInputLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<android.support.v7.widget.AppCompatEditText
android:id="@+id/emailField"
android:layout_width="275dp"
android:layout_height="wrap_content"
android:paddingBottom="16dp"
android:paddingTop="14dp"
android:hint="@{hint123}"
android:textCursorDrawable="@null"
android:background="@drawable/edit_text_background"
android:fontFamily="@font/eina_regular"
android:textColor="@color/edit_text_color"
android:textColorHint="@color/edit_text_color"
android:textSize="15sp"
/>
</android.support.design.widget.TextInputLayout>
</layout>
And I include it in another file:
<?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">
<include
layout="@layout/custom_edit_text"
app:hint123="Email"/>
</layout>
However the project refuses to compile after a clean & rebuild with the error:
AAPT: error: attribute hint123 (aka inc.company.appname:hint123) not found.
Any ideas?
I also have
dataBinding {
enabled = true
}
enabled in the app level build.gradle
I think I've hit upon the solution. To activate data binding, you need to use a @{} expression, and what's in the braces must be valid Java code. So a literal string must be enclosed in quotes... which must be encoded as " inside an XML attribute value. Put it all together and you get:
<include
layout="@layout/custom_edit_text"
app:hint123="@{"Email"}"/>
Data binding does work for include files, it's just that the syntax for a literal is a bit convoluted. I had the same issue and this form is working in my project.
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