How to set a view's height match parent in ConstraintLayout?

Question

I am creating a layout.I want to set my custom toolbar(Which is another layout) to the top of layout and the FrameLayout

Answer 1

Note, that unlike other viewgroups in android, constraintlayout should have circular dependencies between the child views. Herewith, you should use 0dp instead of 'match_parent' width and constraints for each side of the child view.