Report to the system that your app is now fully drawn, purely for diagnostic purposes (calling it does not impact the visible behavior of the activity). This is only used to help instrument application launch times, so that the app can report when it is fully in a usable state; without this, the only thing the system itself can determine is the point at which the activity's window is first drawn and displayed. To participate in app launch time measurement, you should always call this method after first launch (when Activity.OnCreate(Android.OS.Bundle) is called), at the point where you have entirely drawn your UI and populated with all of the significant data. You can safely call this method any time after first launch as well, in which case it will simply be ignored.