My current project had been building with Gradle just fine, since I created it (about a month ago), after acquiring Android-Studio. [I installed some earlier updates to Andr
Gradle should be updated already, you just need to let your previous projects know gradle has been updated.
Source
Edit your build.gradle file to show this:
dependencies {
classpath 'com.android.tools.build:gradle:0.5.+'
}
This should only be required for projects created with the previous version of Android Studio. New projects you create will have that by default.