This is the TopoDroid app (com.topodroid.TDX) repository.
TopoDroid is a productivity Android app for cave surveying. It is specially designed to do cave surveying with an integrated electronic surveying device, although it can be profitably used even without it. Supported devices: DistoX (v. 1, 2, and BLE), Cavway X1, BRIC (4 and 5), SAP (5 and 6), DiscoX, and JedEye.
Visit the website https://sites.google.com/site/speleoapps for more informations about TopoDroid, and in particular for the old version changes doc.
The most recent TopoDroid apks, as well as recent version changes info, are on http://marcocorvi.altervista.org/caving/speleoapps/speleoapks/TopoDroidApks.html
All the code on this repository is provided under GNU General Public Licence v. 3.