Android 4.1 Jelly Bean is the most secure version yet. Android now fully implements Address Space Layout Randomization (ASLR) ... heap, and stack, in a process's address space.

Increasing the Heap Size on an Android Application. In each Android app, a heap size is dynamically created to take care of the new objects you create in the Android program.

Android Jumps to Top of the Smartphone Heap. Net Work By Tony Bradley, Apr 6, 2011 7:45 am PDT. Android has a message for other mobile OS platforms: “You will be assimilated.