问题
I have added ConstraintLayout 1.0.0 to my project as a dependency and it builds successfully. But in Android Studio 2.2 in activity_main.xml in Design tab I always receive this message:
Rendering Problems The following classes could not be found: - android.support.constraint.ConstraintLayout ( Add constraint-layout library dependency to the project, Fix Build Path, Edit XML, Create Class) Tip: Try to build the project. Tip: Try to refresh the layout.
Because of that visual editor doesn't display components I add.
What to do?
来源：https://stackoverflow.com/questions/42442240/rendering-problems-the-following-classes-could-not-be-found-android-support-con