popup window on my map Fragment android studio - android-studio

Question

can anyone help me with this i want to show a popupwindow on top of my map fragment when i click on a button it will display a popupwindow that contains text for example the text will be how the user will navigate the map
public class FirstFragment extends Fragment {
public FirstFragment() {
// require a empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_first, container, false);
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.maps); //use SuppoprtMapFragment for using in fragment instead of activity MapFragment = activity SupportMapFragment = fragment
mapFragment.getMapAsync(new OnMapReadyCallback() {
public void onMapReady(#NonNull GoogleMap googleMap) {
GoogleMap mMap = googleMap;
mMap.getUiSettings().setMyLocationButtonEnabled(true);
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.setBuildingsEnabled(true);
mMap.setInfoWindowAdapter(new CustomInfoWindowAdapter(requireContext()));
mMap.setMapStyle(
MapStyleOptions.loadRawResourceStyle(requireContext(), R.raw.style));
CameraPosition googlePlex = CameraPosition.builder()
.target(new LatLng(14.5768, 121.0332))
.zoom(15)
.bearing(0)
.tilt(60)
.build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(googlePlex), 4000, null);
mMap.addMarker(new MarkerOptions()
.icon(bitmapDescriptorFromVector(getActivity(), R.drawable.ic_baseline_location_city_24))
.position(new LatLng(14.5768, 121.0332))
.title("Mandaluyong");
KmlLayer layer = null;
try {
layer = new KmlLayer(mMap, R.raw.mandaluyong, getContext());
} catch (Exception e) {
e.printStackTrace();
}
for (KmlPlacemark placemark : layer.getPlacemarks()) {
}
layer.addLayerToMap();
mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
#Override
public void onMapLongClick(LatLng point) {
mMap.addMarker(new MarkerOptions()
.position(point)
.title("Home")
.snippet("Your PlaceMarker!!!"));
this is the xml file i've added a floating action button on it now when click it i want to display a popup window that will show on top of my map fragment ive tried different things and it crashes or doesnt show the popup ive decided to ask here because i am stuck in this part
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
xmlns:app="http://schemas.android.com/apk/res-auto">
<fragment
android:id="#+id/maps"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/infobutton"
android:src="#drawable/ic_baseline_info_24"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="30dp"
android:layout_marginTop="30dp"
android:layout_marginEnd="2dp"
android:layout_marginRight="2dp"
android:layout_marginBottom="97dp"
android:clickable="true"
android:rotation="0" />
<FrameLayout
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_marginLeft="60dp"
android:layout_marginTop="300dp">
</FrameLayout>
</RelativeLayout>
here are the java and xml files of the map fragment that i used
[maps app pic][1]
[1]: https://i.stack.imgur.com/xaBIR.png