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android {
    ...
    dataBinding{
        enabled = true
    }
}

dependencies {
    def lifecycle_version = "2.0.0"
    ...

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public class LoginActivity extends AppCompatActivity {

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

        //ActivityLoginBinding is generated after build project
        //and set layout and view model
        ActivityLoginBinding activityLoginBinding
                = DataBindingUtil.setContentView(this,R.layout.activity_login);

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public class LoginModel {

    private String email;

    private String password;

    public LoginModel(String email, String password) {
        this.email = email;
        this.password = password;
    }

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public class LoginViewModel extends BaseObservable {

    private final int PASSWORD_MIN_LENGTH = 8;

    private LoginModel loginModel;

    private boolean isSuccess;

    public LoginViewModel(){
        this.loginModel = new LoginModel("","");

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<?xml version="1.0" encoding="utf-8"?>
<!--Root element maybe Layout-->
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:bind="http://schemas.android.com/tools">

    <data>
        <!--Login view model-->
        <variable
            name="viewModel"
            type="com.example.mvvm_ac.viewmodels.LoginViewModel" />

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public class AppInformation : IAppInformation
{
    public string Version
    {
        get
        {
            var context = Application.Context;

            PackageManager manager = context.PackageManager;
            PackageInfo info = manager.GetPackageInfo( context.PackageName, default(int) );

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namespace DependencyInjection.iOS.Dependencies
{
    public class AppInformation : IAppInformation
    {
        public string Version => 
            NSBundle.MainBundle.ObjectForInfoDictionary( "CFBundleShortVersionString" ).ToString();
    }
}

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public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
{
    public override bool FinishedLaunching(UIApplication app, NSDictionary options)
    {
        this.registerDependencies();

        LoadApplication(new App());

        return base.FinishedLaunching(app, options);
    }

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public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
    protected override void OnCreate(Bundle savedInstanceState)
    {
        //...

        this.registerDependencies();

        LoadApplication(new App());
    }

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public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();

        //Resolve ViewModel instance and his dependencies
        BindingContext = App.Container.Resolve(typeof(MainViewModel));
    }
}