Add a toolbar in a MvxPreferenceFragmentCompat - xamarin

Question

I'm getting some problems creating a settings page using MvxPreferenceFragmentCompat. I've already shown the preferences view, but I could not include the toolbar in the same page.
I'm using XPlatformMenus sample to create my app.
I've already try many solutions like
attempt 1 or attempt 2, but no success.
Here is my current code:
SettingsFragment.cs
[MvxFragment(typeof(MainViewModel), Resource.Id.content_frame)]
[Register("myapp.droid.fragments.SettingsFragment")]
public class SettingsFragment : BasePreferenceFragment<SettingsViewModel>
{
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
base.showHamburgerMenu = true;
return base.OnCreateView(inflater, container, savedInstanceState);
}
public override void OnCreatePreferences(Bundle savedInstanceState, string rootKey)
{
this.AddPreferencesFromResource(FragmentId);
}
protected override int FragmentId
{
get
{
return Resource.Layout.fragment_settings;
}
}
}
fragment_settings.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<CheckBoxPreference
android:key="pref_sync"
android:title="Title sample"
android:summary="Here is the checkbox summary"
android:defaultValue="true" />
</PreferenceScreen>
BasePreferenceFragment
public abstract class BasePreferenceFragment : MvxPreferenceFragmentCompat
{
protected Toolbar _toolbar;
protected MvxActionBarDrawerToggle _drawerToggle;
/// <summary>
/// If true show the hamburger menu
/// </summary>
protected bool showHamburgerMenu = false;
protected BasePreferenceFragment()
{
RetainInstance = true;
}
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
var view = base.OnCreateView(inflater, container, savedInstanceState);
_toolbar = view.FindViewById<Toolbar>(Resource.Id.toolbar);
if (_toolbar != null)
{
((MainActivity)Activity).SetSupportActionBar(_toolbar);
if (showHamburgerMenu)
{
((MainActivity)Activity).SupportActionBar.SetDisplayHomeAsUpEnabled(true);
_drawerToggle = new MvxActionBarDrawerToggle(
Activity, // host Activity
((MainActivity)Activity).DrawerLayout, // DrawerLayout object
_toolbar, // nav drawer icon to replace 'Up' caret
Resource.String.drawer_open, // "open drawer" description
Resource.String.drawer_close // "close drawer" description
);
_drawerToggle.DrawerOpened += (object sender, ActionBarDrawerEventArgs e) =>
{
if (Activity != null)
((MainActivity)Activity).HideSoftKeyboard();
};
((MainActivity)Activity).DrawerLayout.AddDrawerListener(_drawerToggle);
}
}
return view;
}
protected abstract int FragmentId { get; }
public override void OnConfigurationChanged(Configuration newConfig)
{
base.OnConfigurationChanged(newConfig);
if (_toolbar != null && null != _drawerToggle)
{
_drawerToggle.OnConfigurationChanged(newConfig);
}
}
public override void OnActivityCreated(Bundle savedInstanceState)
{
base.OnActivityCreated(savedInstanceState);
if (_toolbar != null && null != _drawerToggle)
{
_drawerToggle.SyncState();
}
}
}
public abstract class BasePreferenceFragment<TViewModel> : BasePreferenceFragment where TViewModel : class, IMvxViewModel
{
public new TViewModel ViewModel
{
get { return (TViewModel)base.ViewModel; }
set { base.ViewModel = value; }
}
}
toolbar_actionbar.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:id="#+id/appbar"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
local:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>
fragment_setting_screen.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
layout="#layout/toolbar_actionbar" />
<FrameLayout
android:id="#+id/content_frame"
android:layout_below="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
What am I doing wrong? Any idea?