The following is an example code demonstrating how data binding can be implemented in Android programming.

XML Layout

The XML layout file, activity_main.xml, can contain the following code using ConstraintLayout:

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="<http://schemas.android.com/apk/res/android>">
    <data>
        <variable
            name="user"
            type="com.example.User" />
    </data>
    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView
            android:id="@+id/tv_first_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{user.firstName}"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent" />
        <TextView
            android:id="@+id/tv_last_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{user.lastName}"
            app:layout_constraintTop_toBottomOf="@id/tv_first_name"
            app:layout_constraintStart_toStartOf="@id/tv_first_name"
            app:layout_constraintEnd_toEndOf="@id/tv_first_name" />
    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

Kotlin Code

The Kotlin code can contain the following code:

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        val user = User("John", "Doe")
        binding.user = user
    }
}

Conclusion

That's it! This simple code demonstrates how to use data binding with ConstraintLayout in Android programming.