Zoho Books Android App

I recently moved from Zoho Invoice to Zoho books. Now I have stumbled upon the fact that Zoho Books has no android (or other) app. I can no longer enter time billable to my clients while I am at the client (or en-route/leaving). And my nifty Zoho Invoice app is useless. I'm not going to enter things twice and deal with all the mess of transporting the data between the two, nearly identical, systems (identical for the purposes of this discussion, for time tracking and invoicing).

Questions:

1. What am I to do? How do you deal with mobile data entry in Books?

2. When will you make the Zoho Books app? I'm also a coder (not mobile apps) for some clients and to me it seems with so much existing code shared by both web apps that it'd not be a far stretch to copy-and-tweak the Invoice app to have the Books app. Books grew out of Invoice. I suggest the Books App grow out of the Invoice App and that it be done ASAP, since it seems so little work.

Or, at the very least, tell me the details and the truth and let me decide whether I wish to stay with Books at all.

Thank you.