We have upgraded our continuous test environment from Android 2.x to Android 3.2. In the process we have fixed the following two issues:
db4o used to generate its unique signature for a new database file by asking the device for it's host name. With newly introduced behaviour in Android 3.x, this call would trigger a NetworkOnMainThreadException if executed in the UI thread and database creation would fail. We fixed the issue by creating the database signature on Android from random numbers only.
The built-in serialization architecture has changed with Android 3.x and db4o's method of instantiating objects without constructor invocation by calling ObjectInputStream#newInstance() would no longer work. We have found an alternative, we now use ObjectStreamClass#newInstance() to keep the functionality available.
Android continues to be a very important platform for db4o. Every build runs all tests against an Android 3.2 emulator before it goes live.
Enjoy using db4o on Android!