<?xml version="1.0" encoding="utf-8"?>
<!-- Wrap your Layout into <layout></layout> tags -->
<layout [...]>

    <!-- define variables and imports you want to use -->
    <data>
        <variable name="model" type="de.schroepf.databinding.model.User" />
     </data>

    <LinearLayout [...]>

        <!-- Surround any data binding expression with @{...} -->
        <ImageView [...] app:imageResource='@{model.photo}' />
        <TextView [...] android:text='@{model.firstName + " " + model.lastName}' />
    </LinearLayout>
</layout>

// The fields of this model class can be accessed in the layout.xml file 
// Extend BaseObservable or use ObservableFields to allow the layout to respond to changes.
public class User {
    public final String firstName;
    public final String lastName;
    @DrawableRes
    public final int photo;

    public User(String firstName, String lastName, @DrawableRes int photo) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.photo = photo;
    }
}

public class MainActivity extends Activity { 
    // represents the state we want to display in this activity
    private User myModel = new User("Coffee", "Toffee", R.drawable.coffee_toffee);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Make sure to use DataBindingUtil to setContentView/inflate your view and retrieve the binding
        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);

        // use the binding to access the layout's view hierarchy (typesafe!) and set variables
        binding.setModel(myModel);
    }
}