Xamarin Android : cannot convert from 'AndroidX.Fragment.App.FragmentManager' to 'Android.Support.V4.App.FragmentManager'

Issue

I'm trying Migrate my Xamarin Android app with AndroidX. After Migrate this error is coming.

cannot convert from 'AndroidX.Fragment.App.FragmentManager' to 'Android.Support.V4.App.FragmentManager'

using AndroidX.Fragment.App;
using Xamarin.Forms.Platform.Android;
using AndroidX.AppCompat.App;

 private void ShowDatePicker()
    {
        if (_monthYearPickerDialog == null)
        {
            _monthYearPickerDialog = new MonthYearPickerDialog();
            _monthYearPickerDialog.OnDateTimeChanged += OnDateTimeChanged;
            _monthYearPickerDialog.OnClosed += OnClosed;
        }
        _monthYearPickerDialog.Date = Element.Date;
        var appcompatActivity = CrossCurrentActivity.Current.Activity as AppCompatActivity;
        var mFragManager = appcompatActivity?.SupportFragmentManager;
        if (mFragManager != null)
        {
            _monthYearPickerDialog.Show(mFragManager, nameof(MonthYearPickerDialog));
        }
    }

Any help is appreciated. Thanks!

Solution

You cannot mix types from Support.V4 namespace with AndroidX namespace. So it is super weird that you are defining this in the top of the file:

using Fragment = Android.Support.V4.App.Fragment;
using SupportV4 = Android.Support.V4.App;

You should use Fragment from AndroidX.Fragment instead.

Stop mixing up things and your errors will go away.

Answered By - Cheesebaron