getlastlocation returns null on android 29 or Higher. But I can get location Data on Lower version

Question

I need to device location on android. I get this on Android 27 or lower. But when I checked on Android 29 or Higher, Its return null.

How can I do? Advanced Thanks.

private FusedLocationProviderClient client;

on code:

client = LocationServices.getFusedLocationProviderClient(getContext());
client.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {
        @Override
        public void onComplete(@NonNull Task<Location> task) {

            Location location = task.getResult();

            if (location != null){
                double latitude = location.getLatitude();
                double longitude = location.getLongitude();
                latLng = new LatLng(latitude, longitude);

                try {
                    String address = Common_Resources.getAttendanceAddress(getContext(), latitude, longitude);
                    check_In_Out_Dialog(type, address, latitude, longitude);
                } catch (IOException e) {
                    e.printStackTrace();
                    Context context;
                    AlertDialog.Builder alert = new AlertDialog.Builder(getContext());
                    alert.setTitle("Please Enable your Location.");
                    alert.setNegativeButton("Close", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
                    alert.show();
                }
            } else {
                Log.e("Location: ", "onComplete: Location: "+ location);
            }


        }
    });