Step-1: Enable data binding to android project ADD below line to your app level build.gradle file. android { buildFeatures { dataBinding = true } } Setp-2 : Add all your XML layout design inside this <layout></layout> tag <?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" xmlns:tools="http://schemas.android.com/tools"> <androidx.constraintlayout.widget.ConstraintLayout android:id="@+id/main" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/greeting_text_view" android:layout_width="wrap_content" android:lay...