Include layout with custom attributes

I know this is an old question but I came across it and found that it is now possible thanks to Data Binding.

First you need to enable Data Binding in your project. Use DataBindingUtil.inflate (instead of setContentView, if it’s Activity) to make it work.

Then add data binding to the layout you want to include:

<?xml version="1.0" encoding="utf-8"?>    
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable name="title" type="java.lang.String"/>
    </data>
    <RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/screen_header"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:gravity="center">

    ...

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:textSize="20sp"
            android:textStyle="bold"
            android:text="@{title}"/>

    ...

    </RelativeLayout>
</layout>

Finally, pass the variable from the main layout to the included layout like this:

<?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>
        ...
    </data>
    ...
    <include layout="@layout/included_layout"
        android:id="@+id/title"
        app:title="@{@string/title}"/>
    ...
</layout>