We've just pushed Android Studio 2.0 Preview 9 to the canary channel -- along with 2.0.0-alpha9 of the Gradle plugin to jcenter (and as part of the bundled offline repository within the IDE).
In this release, we've completely turned off in-memory dexing by default. We've spent the last couple of previews trying to fine-tune it, but there are lingering issues which continues to affect users. This should hopefully make the builds work a lot better for many of you. (If things were already working well, you can continue with in-memory dexing by turning it on with
We've also continued to fix various Instant Run scenarios; in particular, using APK splits on API 23 seems to trigger some platform bugs, so for now we've switched over to using multidex for coldswap for both Lollipop and Marshmallow.
(Release notes for the Gradle plugin will appear here.)
Thanks for testing our preview builds, and please continue reporting bugs (via Help > Submit Feedback).
You can update your current 2.0 Preview installation to Preview 9 via the built-in patch mechanism (Check for Updates).
You can also update from 1.5 to 2.0 Preview via the patch mechanism, but you may not want to do that: See our page about how to keep multiple installations simultaneously while Studio is in preview mode.
You can also download a full zip of 2.0 Preview from the Android Studio 2.0 Preview 9 page.
If you run into problems, be sure to check the Known Issues page which we'll update as necessary.
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