How to enable Heap updates on my android client
On the devices tab, there are a bunch of icons starting with a green bug. To the right of that is the "Update Heap: button which looks like a green cylinder that is half full. Press that button and the heap tab should be enabled. Click "Cause GC" to populate the Heap tab.
It is worth to mention one thing, you have to put in android:debuggable="true" in the AndroidManifest.xml (under Application tag) in order to see the process list appear under the available device/simulator (in DDMS). Even though you are not trying to run your application in debug mode.