I’m more or less finished with an initial Version of the Android App and Desktop Software. The Desktop part consists of 2 Elements. First is the Server running in the Background (no Gui) and Second is an Applet.
The Server shows Desktop Notifications and sends Information to the Applet via Dbus. The Applet is specific to the Desktop Environment (Gnome, Unity,…)  you use. The Gnome Shell Version is ready and a Demo can be seen in this Video

I didn’t show the File Transfer and some other stuff, but this is how it will look like.

I’m currently fixing some Bugs, after that I’ll release a first version for Gnome and start working on a Unity Applet. I’ll also describe how the whole Security works in another Post.