Are you sure the dives are not exported? I think all dives are exported, but not all dives are imported into DiveMate. In this case the problem would be on the DiveMate side. You can try to create a new empty DiveMate logbook and try the import into the empty logbook.
I've tried several times to start an Android version of Diving Log, but unfortunately the initial hurdle is high, at least for me. I find the developer tools very lacking and creating a full featured dive log app is not as easy as it sounds. And the development time is even longer when the language and the tools are not familar. But I have not given up completely
