36.3 Adding the Layout Element

As described in “An Overview of Android Jetpack Data Binding”, in order to be able to use data binding, the layout hierarchy must have a layout component as the root view. This requires that the following changes be made to the main_fragment.xml layout file (app -> res -> layout -> main_fragment.xml). Open this file in the layout editor tool, switch to Code mode and make these changes:

<?xml version="1.0" encoding="utf-8"?>

 

<layout xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    xmlns:android="http://schemas.android.com/apk/res/android">

 

        <androidx.constraintlayout.widget.ConstraintLayout

            android:id="@+id/main...