MainActivity.cs

using Android.Widget;
using Android.OS;
using Android.Support.Design.Widget;
using Android.Support.V4.Widget;
using Android.Support.V7.Widget;
using Android.Support.V7.App;
using Android.Views;
using Android.App;
using SupportFragment = Android.Support.V4.App.Fragment;


namespace PariwisataApp
{
    [Activity(Label = "Pariwisata App", MainLauncher = false, Theme = "@style/Temaku")]
    public class MainActivity : AppCompatActivity
    {

        //Buat variable
        DrawerLayout drawerLayout;
        private SupportFragment mCurrentFragment;
        private HomeFragment homeFragment;


        protected override void OnCreate(Bundle savedInstanceState)
        {

            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.Main);
            drawerLayout = FindViewById<DrawerLayout>(Resource.Id.drawer_layout);


            // Membuat konfigurasi Toolbar
            var toolbar = FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.app_bar);
            SetSupportActionBar(toolbar);
            SupportActionBar.SetTitle(Resource.String.app_name);
            SupportActionBar.SetDisplayHomeAsUpEnabled(true);
            SupportActionBar.SetDisplayShowHomeEnabled(true);


            // Memasukan item yang terseleksi agar masuk di navigasi
            var navigationView = FindViewById<NavigationView>(Resource.Id.nav_view);
            navigationView.NavigationItemSelected += NavigationView_NavigationItemSelected;

            // Membuat drawer toolbar
            var drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, Resource.String.open_drawer, Resource.String.close_drawer);
            drawerLayout.AddDrawerListener(drawerToggle);
            drawerToggle.SyncState();

            //Definisikan nama fragment agar dapat dipanggil pada navigasi
            homeFragment = new HomeFragment();


            //Menambahkan Fragment
            var trans = SupportFragmentManager.BeginTransaction();

            //Tampilkan home Fragment
            trans.Add(Resource.Id.HomeFrameLayout, homeFragment, "Home");

            trans.Commit();
            mCurrentFragment = homeFragment;
        }





        //Definisikan kemana navigasi akan diarahkan
        void NavigationView_NavigationItemSelected(object sender, NavigationView.NavigationItemSelectedEventArgs e)
        {
            switch (e.MenuItem.ItemId)
            {
                case (Resource.Id.nav_home):
                    Toast.MakeText(this, "Anda memilih halaman Home!", ToastLength.Short).Show();
                    var transaction = SupportFragmentManager.BeginTransaction();
                    HomeFragment homeFragment = new HomeFragment();
                    transaction.Replace(Resource.Id.HomeFrameLayout, homeFragment);
                    transaction.AddToBackStack(null);
                    transaction.Commit();
                    break;

                case (Resource.Id.nav_wisata):
                    Toast.MakeText(this, "Anda memilih halaman Wisata!", ToastLength.Short).Show();

                    break;

                case (Resource.Id.nav_kuliner):
                    Toast.MakeText(this, "Anda memilih halaman Kuliner!", ToastLength.Short).Show();

                    break;

                case (Resource.Id.nav_profil):
                    Toast.MakeText(this, "Anda memilih halaman Profil!", ToastLength.Short).Show();
                    var transactionssss = SupportFragmentManager.BeginTransaction();

                    break;

                case (Resource.Id.nav_hotel):
                    Toast.MakeText(this, "Anda memilih halaman Hotels!", ToastLength.Short).Show();

                    break;



                case (Resource.Id.nav_out):
                    Toast.MakeText(this, "Anda logout sekarang!", ToastLength.Short).Show();
                    this.FinishAffinity();
                    break;
            }
            // Close drawer jika touch diluar drawer layout
            drawerLayout.CloseDrawers();
        }

        //Buat options menu
        public override bool OnCreateOptionsMenu(IMenu menu)
        {
            MenuInflater.Inflate(Resource.Menu.action_menu, menu);
            return true;
        }

        //Jika option menu di pilih
        public override bool OnOptionsItemSelected(IMenuItem item)
        {
            switch (item.ItemId)
            {
                case Resource.Id.action_settings1:
                    Toast.MakeText(this, "Open Bluetooth!", ToastLength.Short).Show();
                    //do something
                    return true;
                case Resource.Id.action_settings2:
                    Toast.MakeText(this, "Logout!", ToastLength.Short).Show();
                    //StartActivity(typeof(LoginActivity));
                    //do something
                    return true;
            }
            return base.OnOptionsItemSelected(item);
        }


        //Fungsi ketika tombol back di prees
        public override void OnBackPressed()
        {
            if (FragmentManager.BackStackEntryCount != 0)
            {
                FragmentManager.PopBackStack();//fragmentManager.popBackStack();
            }
            else
            {
                base.OnBackPressed();
            }
        }

    }
}