public class User {
    private final String firstName;
    private final String lastName;

    public User(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ActivityBasicBinding binding = DataBindingUtil.setContentView(
            this, R.layout.activity_basic);
    User user = new User("fei", "Liang");
    binding.setUser(user);
}

setFirstName(String firstName);
setLastName(String lastName);

public class MyStringUtils {
    public static String capitalize(final String word) {
        if (word.length() > 1) {
            return String.valueOf(word.charAt(0)).toUpperCase() + word.substring(1);
        }
        return word;
    }
}

<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="@{MyStringUtils.capitalize(user.firstName)}" />

android:text="@{user.displayName ?? user.lastName}"

android:text="@{user.displayName != null ? user.displayName : user.lastName}"

public class ObservableUser extends BaseObservable {
    private String firstName;
    private String lastName;

    @Bindable
    public String getFirstName() {
        return firstName;
    }

    @Bindable
    public String getLastName() {
        return lastName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
        notifyPropertyChanged(BR.firstName);
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
        notifyPropertyChanged(BR.lastName);
    }
}

public class PlainUser {
    public final ObservableField<String> firstName = new ObservableField<>();
    public final ObservableField<String> lastName = new ObservableField<>();
    public final ObservableInt age = new ObservableInt();
}

public final TextView firstName;

binding = DataBindingUtil.setContentView(this, R.layout.activity_view_stub);
binding.viewStub.setOnInflateListener(new ViewStub.OnInflateListener() {
	@Override
	public void onInflate(ViewStub stub, View inflated) {
		ViewStubBinding binding = DataBindingUtil.bind(inflated);
		User user = new User("fee", "lang");
		binding.setUser(user);
	}
});

public static class BindingHolder extends RecyclerView.ViewHolder {
    private ViewDataBinding binding;

    public BindingHolder(View itemView) {
        super(itemView);
    }

    public ViewDataBinding getBinding() {
        return binding;
    }

    public void setBinding(ViewDataBinding binding) {
        this.binding = binding;
    }
}

@Override
public BindingHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    ViewDataBinding binding = DataBindingUtil.inflate(
            LayoutInflater.from(viewGroup.getContext()),
            R.layout.list_item,
            viewGroup,
            false);
    BindingHolder holder = new BindingHolder(binding.getRoot());
    holder.setBinding(binding);
    return holder;
}

@Override
public void onBindViewHolder(BindingHolder holder, int position) {
    User user = users.get(position);
    holder.getBinding().setVariable(BR.user, user);
    holder.getBinding().executePendingBindings();
}

ViewDataBinding binding = DataBindingUtil.inflate(
	LayoutInflater.from(viewGroup.getContext()),
	R.layout.list_item,
	viewGroup,
	false);

public class UserAdapter extends RecyclerView.Adapter<UserAdapter.UserHolder> {
    private static final int USER_COUNT = 10;

    @NonNull
    private List<User> mUsers;

    public UserAdapter() {
        mUsers = new ArrayList<>(10);
        for (int i = 0; i < USER_COUNT; i ++) {
            User user = new User(RandomNames.nextFirstName(), RandomNames.nextLastName());
            mUsers.add(user);
        }
    }

    public static class UserHolder extends RecyclerView.ViewHolder {
        private UserItemBinding mBinding;

        public UserHolder(View itemView) {
            super(itemView);
            mBinding = DataBindingUtil.bind(itemView);
        }

        public void bind(@NonNull User user) {
            mBinding.setUser(user);
        }
    }

    @Override
    public UserHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.user_item, viewGroup, false);
        return new UserHolder(itemView);
    }

    @Override
    public void onBindViewHolder(UserHolder holder, int position) {
        holder.bind(mUsers.get(position));
    }

    @Override
    public int getItemCount() {
        return mUsers.size();
    }
}

@BindingConversion
public static ColorDrawable convertColorToDrawable(int color) {
    return new ColorDrawable(color);
}