The only way I found to get the exp4j classes to be built and included in the apk...
[debian/openrocket] / android / src / net / sf / openrocket / android /
drwxr-xr-x   ..
-rw-r--r-- 1681 AboutDialogFragment.java
-rw-r--r-- 1551 ActivityHelpers.java
-rw-r--r-- 2079 Application.java
-rw-r--r-- 4323 CurrentRocket.java
-rw-r--r-- 244 CurrentRocketHolder.java
-rw-r--r-- 2072 Main.java
-rw-r--r-- 1493 MotorDatabaseAdapter.java
-rw-r--r-- 3893 PreferencesActivity.java
-rw-r--r-- 2414 PreferencesAdapter.java
drwxr-xr-x - db
drwxr-xr-x - events
drwxr-xr-x - filebrowser
drwxr-xr-x - motor
drwxr-xr-x - rocket
drwxr-xr-x - simservice
drwxr-xr-x - simulation
drwxr-xr-x - thrustcurve
drwxr-xr-x - util