We just published ConstraintLayout beta 1 -- our first release candidate for the upcoming 1.0 stable release.
As always, it's available in the SDK Manager (under the "Support Repository" section).
Note: As for alpha 8 and 9, if you are using Android Studio 2.2 and it is your first installation of ConstraintLayout, you might have to restart studio (or invalidate caches) after installing beta 1 (the editor behavior may not be correct, with widgets temporarily snapping to the top left corner).
We fixed several issues in this build:
Few small features were added as we are heading toward a stable release in the next few weeks:
The documentation has been updated https://developer.android.com/reference/android/support/constraint/package-summary.html
Important: The layout editor in AndroidStudio 2.2 does not support the new Chains feature, so will not have affordances to help you interact with chains. The preview visualization ("design mode") in the layout editor will show you the correct positioning if you use chains, but the blueprint mode will not, showing incorrect bounds for the widgets. We are planning to update the editor in our next Android Studio preview release, to support Chains adequately.
Please give us feedback on this release, as this is the first release candidate :)
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