How can I detect the Android runtime (Dalvik or ART)?

Question

Google added a new ART runtime with Android 4.4. How can I determine whether ART or Dalvik is the current runtime?

Answer 1

The Android docs actually give the following suggestion:

You can verify which runtime is in use by calling System.getProperty("java.vm.version"). If ART is in use, the property's value is "2.0.0" or higher.

This seems accurate on my Nexus 4 w/ ART enabled (running Android 4.4.4). Nexus 5 on Dalvik returned 1.6.0.