I have been using an Android app "Got To Do" (by Slamjibe) into Toodledo for 1-2 years. Works great and is solid. Tried others like DGT GTD but they were not reliable.
The original product was dropped by the original developer when he got a new job but that was a year ago and the product must be supported by someone else or is so stable as not to require support (?).
It is called "Got To Do" by SLAMJIBE. It runs great on my Thunderbolt phone and on my Lenovo Thinkpad Tablet. I would be lost without it.
-I tried out the Lite version and then paid for the paid upgrade to handle nested tasks, etc.