 <p>I'm running into the same issue on Xamarin.android. Here's what <a href="https://developer.android.com/reference/android/app/Fragment.html#setArguments%28android.os.Bundle%29" rel="nofollow">the documentation</a> says.</p> <blockquote> <p>This can only be called before the fragment has been attached to its activity</p> </blockquote>