MapFragment inside a ScrollView

Activity.cs

public class MyActivity : Activity
{
  private GoogleMap _map;
  private HorizontalScrollView _hsv;

  protected override void OnCreate(Bundle bundle)
  {
    base.OnCreate(bundle);
    SetContentView(Resource.Layout.rtc);

    _hsv = FindViewById<HorizontalScrollView>(Resource.Id.scroll);
    SetupMapIfNeeded();
  }
	
  private void SetupMapIfNeeded()
  {
    if (null != _map) return;

    var frag = FragmentManager.FindFragmentById<TouchableMapFragment>(Resource.Id.map);
    if (frag != null)
    {
      frag.TouchUp += (sender, args) => _hsv.RequestDisallowInterceptTouchEvent(false);
      frag.TouchDown += (sender, args) => _hsv.RequestDisallowInterceptTouchEvent(true);

      _map = frag.Map;
      if (_map == null) return; // will probably not happen
			
      // do stuff to _map here, such as adding overlays etc.
    }
  }
}

TouchableMapFragment.cs

public class TouchableMapFragment : MapFragment
{
  public event EventHandler TouchDown;
  public event EventHandler TouchUp;

  public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
  {
    var root = base.OnCreateView(inflater, container, savedInstanceState);
    var wrapper = new TouchableWrapper(Activity);
    wrapper.SetBackgroundColor(Resources.GetColor(Android.Resource.Color.Transparent));
    ((ViewGroup) root).AddView(wrapper,
      new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.MatchParent));

    wrapper.TouchUp = () =>
    {
      if (TouchUp != null)
        TouchUp(this, EventArgs.Empty);
    };
    wrapper.TouchDown = () =>
    {
      if (TouchDown != null)
        TouchDown(this, EventArgs.Empty);
    };

    return root;
  }

  class TouchableWrapper : FrameLayout
  {
    public Action TouchDown;
    public Action TouchUp;

    #region ctors
    protected TouchableWrapper(IntPtr javaReference, JniHandleOwnership transfer) 
      : base(javaReference, transfer) {}
    public TouchableWrapper(Context context) 
      : this(context, null) {}
    public TouchableWrapper(Context context, IAttributeSet attrs) 
      : this(context, attrs, 0) {}
    public TouchableWrapper(Context context, IAttributeSet attrs, int defStyle) 
      : base(context, attrs, defStyle) { }
    #endregion

    public override bool DispatchTouchEvent(MotionEvent e)
    {
      switch (e.Action)
      {
        case MotionEventActions.Down:
          if (TouchDown != null)
            TouchDown();
          break;
        case MotionEventActions.Cancel:
        case MotionEventActions.Up:
          if (TouchUp != null)
            TouchUp();
          break;
      }

      return base.DispatchTouchEvent(e);
    }
  }
}

view.axml

<?xml version="1.0" encoding="utf-8"?>
<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/scroll">
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="wrap_content"
        android:layout_height="match_parent">
        <fragment
            android:id="@+id/map"
            android:layout_width="600dp"
            android:layout_height="match_parent"
            android:name="my.awesome.namespace.TouchableMapFragment" />
    </LinearLayout>
</HorizontalScrollView>