Data binding expression not compiling

Question

I'm trying out the new data binding library. I have a weird issue where binding the visibility property is not compiling.

This is a simplified version of the xml file:

<?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="http://schemas.android.com/apk/res/android">      <data>      <variable         name="header"         type="com.example.EmailHeader" />     </data>      <RelativeLayout ... >          <TextView             ...             android:text="@{header.senderName ?? header.senderAddress}"             android:visibility="@{header.hasAttachment ? View.VISIBLE : View.INVISIBLE}" />      </RelativeLayout> </layout> 

I get the follow message when compiling:

Error:Execution failed for task ':app:compileDebugJavaWithJavac'. 

java.lang.RuntimeException: Found data binding errors. ****/ data binding error ****msg:Identifiers must have user defined types from the XML file. View is missing it

Everything compiles (and works!) when I remove the android:visiblity declaration.

I don't see what I'm missing here

Answer 1

Inside of the data tag you need to also add:

<import type="android.view.View" />