DataBindingExample

activity_main.xml

<layout>

    <data>

        <variable
            name="user"
            type="com.example.belladunovska.databinding.User" />

    </data>


    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/first_name_list_item_text_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@{user.firstName}" />

        <Button
            android:id="@+id/change_name_button"
            android:layout_width="match_parent"
            android:layout_height="30dp" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="300dp" />

    </LinearLayout>
</layout>

item_list.xml

<layout>

    <data>

        <variable
            name="user"
            type="com.example.belladunovska.databinding.User" />

    </data>


    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/first_name_list_item_text_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@{user.firstName}" />

        <TextView
            android:id="@+id/last_name_list_item_text_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@{user.lastName}" />


    </LinearLayout>
</layout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private User user;
    private LinearLayoutManager layoutManager;
    private RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);

        user = new User("Bella", "Dunovska", false);

        binding.setUser(user);
        layoutManager = new LinearLayoutManager(this);

        recyclerView = binding.recyclerView;

        recyclerView.setHasFixedSize(false);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(new RecyclerAdapter(this, generateDummyData()));
        binding.changeNameButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                user.setFirstName("Rocks");
            }
        });
    }

    public ArrayList<User> generateDummyData(){
        ArrayList<User> rockstars = new ArrayList<>();
        User user = new User("Rob","Halford", true);
        User user1 = new User("Bruce","Dickinson", true);
        User user3 = new User("Till","Lindemann", true);
        rockstars.add(user);
        rockstars.add(user1);
        rockstars.add(user3);
        return rockstars;
    }
}

RecyclerAdapter.java

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
    private Context context;
    private ArrayList<User> users;

    public RecyclerAdapter(Context context, ArrayList<User> users) {
        this.users = users;
        this.context = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ItemListBinding listItemUserBinding = DataBindingUtil.inflate(layoutInflater, R.layout.item_list, parent, false);
        return new ViewHolder(listItemUserBinding);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.listItemUserBinding.setUser(users.get(position));
    }


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

    class ViewHolder extends RecyclerView.ViewHolder {
        private ItemListBinding listItemUserBinding;

        public ViewHolder(ItemListBinding itemListBinding) {
            super(itemListBinding.getRoot());
            this.listItemUserBinding = itemListBinding;

        }
    }
}

User.java

public class User extends BaseObservable {
    public String firstName;
    public String lastName;
    public boolean isRockStar;

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

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

    public String getLastName() {
        return lastName;
    }

    public boolean getRockStar() {
        return isRockStar;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
        notifyPropertyChanged(com.example.belladunovska.databinding.BR.firstName);
    }

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