Device implementations MUST support the full Dalvik Executable (DEX) format and Dalvik bytecode specification and semantics. Device implementers SHOULD use ART, the reference upstream implementation of the Dalvik Executable Format, and the reference implementation’s package management system.
Device implementations MUST configure Dalvik runtimes to allocate memory in accordance with the upstream Android platform, and as specified by the following table. (See section 7.1.1 for screen size and screen density definitions.) Note that memory values specified below are considered minimum values and device implementations MAY allocate more memory per application.