Taken from the gradle plugin user guide:
With Android KitKat (buildToolsVersion 19) you can use the diamond operator,
multi-catch, strings in switches, try with resources, etc.
Note that you can use minSdkVersion with a value earlier than 19, for all
language features except try with resources. If you want to use try with
resources, you will need to also use a minSdkVersion of 19.
You also need to make sure that Gradle is using version 1.7 or later of the
JDK. (And version 0.6.1 or later of the Android Gradle plugin.)
