Postpone the entering activity transition when Activity was started with ActivityOptions.makeSceneTransitionAnimation(android.app.Activity, android.util.Pair<android.view.View, java.lang.String>...).
This method gives the Activity the ability to delay starting the entering and shared element transitions until all data is loaded. Until then, the Activity won't draw into its window, leaving the window transparent. This may also cause the returning animation to be delayed until data is ready. This method should be called in Activity.OnCreate(Android.OS.Bundle) or in Activity.OnActivityReenter(int, Android.Content.Intent). Activity.StartPostponedEnterTransition must be called to allow the Activity to start the transitions. If the Activity did not use ActivityOptions.makeSceneTransitionAnimation(android.app.Activity, android.util.Pair<android.view.View, java.lang.String>...), then this method does nothing.