I built the physics demo from here:
https://wiki.jmonkeyengine.org/legacy/doku.php/jme3:beginner:hello_physics
When I try to run it on my Samsung Galaxy S II, the framerate is less than 1. I had previously downloaded and tested the JMonkeyEngine Demo from the Marketplace, and all the demos worked fine, with no obvious slowness. Has anyone else built & run applications like the physics demo that run smoothly on their Android device? The SGS2 is fairly new and powerful, so it should handle this application better.
from this thread:
http://hub.jmonkeyengine.org/groups/android/forum/topic/bullet-and-android-and-eclipse/
sounds like i need to swap out the jbullet library with this one:
http://hub.jmonkeyengine.org/2011/04/27/jme3-native-bullet-physics-is-available-for-testing/