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I made the updating of Android Studio 2.3.3 for 3.0. From there, only headache: ready designs with problem.
Both in the design tab of layouts as in the preview window (preview), the drawing of the screen does not appear (the design of layout). What appears in the preview window is the message android..ActionBarOverlayLayout
as noted in the image below. In addition, queries in the database via HTTP also stopped!
What can it be?
I believe the problem has to do with configuration and not code. It follows image of Toolbar created, which in android studio 2.3 appeared in preview and design tab, and in this new version is not appearing.
You can provide a larger image or at least include part of the problem code in the question?
– José
edited the post and added new image. Thank you
– Nilson Serafim Vieira