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There is currently no released version of Android that uses ART out of the box. It's available behind the development options in KitKat and as default in the L

by crwll 12y ago

There is currently no released version of Android that uses ART out of the box. It's available behind the development options in KitKat and as default in the L developer preview, but that's it. The "optimizing applications" screen comes after system upgrades also with Dalvik.