(MapFragment)FragmentManager.FindFragmentById(Resource.Id.map) retuns null always - visual-studio

Question

I am trying to import google map in to my xamarin.android application. I set the key and written code as following `
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.Maps);
SetUpMap();
FindViewElements();
}
private void SetUpMap()
{
if (mMap == null)
{
var _mapFragment = FragmentManager.FindFragmentByTag("maptag") as MapFragment;//null
var mapFragment = (MapFragment)FragmentManager.FindFragmentById(Resource.Id.map);//null
// var mapFragment = FragmentManager.FindFragmentById<MapFragment>(Resource.Id.map);//Here are also null
// var _mapFragment = SupportFragmentManager.FindFragmentById(Resource.Id.map) as SupportMapFragment; /null
}
}
protected override async void FindViewElements()
{
_mapsModel = new MapsModel
{
MapsFragment = FragmentManager.FindFragmentById<MapFragment>(Resource.Id.map),
MapTypeSpinner = FindViewById<Spinner>(Resource.Id.spinner),
Toolbar = FindViewById<Toolbar>(Resource.Id.mapToolbar),
};
SetSupportActionBar(_mapsModel.Toolbar);
SupportActionBar.Title = "Maps";
SupportActionBar.SetHomeButtonEnabled(true);
SupportActionBar.SetDisplayHomeAsUpEnabled(true);
_mapsModel.MapsFragment.GetMapAsync(this);
_mapsModel.MapTypeSpinner.ItemSelected += MapTypeSpinner_ItemSelected;
}
I have axml as following
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:id="#+id/header">
<include
android:id="#+id/mapToolbar"
layout="#layout/toolbar" />
</RelativeLayout>
<Spinner
android:id="#+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:entries="#array/maptype_arrays" />
<fragment
android.id="#+id/map"
android:tag="maptag"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
</LinearLayout>
I tried every possible way which I found like replacing Fragment to suppportFragment but nothing got helped. Can any one please suggest me to achieve this.
Thanks in advance

Answer 1

I try your axml, and I get the result as your, so I suggest you can add fragment in FrameLayout, so you can get this fragment by Id. Like this:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="#+id/zoomInButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Zoom In" />
<Button
android:id="#+id/zoomOutButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Zoom Out" />
<Button
android:id="#+id/animateButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Animate to Location" />
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</FrameLayout>
var mapFragment = (MapFragment)FragmentManager.FindFragmentById(Resource.Id.map);
var mapFragment = (MapFragment)FragmentManager.FindFragmentById(Resource.Id.map);
You can also take a look the MSDN document about importing Google map in your project:
https://learn.microsoft.com/en-us/xamarin/android/platform/maps-and-location/maps/maps-api