I'm having trouble installing, too. Forgive me if my questions are very basic, by the way. I just installed Android on my Touchpad today. For this. So, I'm a major newb.
First, my Touchpad doesn't have an sdcard0, which may be the issue. It just has an sdcard1. Perhaps this doesn't matter, and it just points to sdcard.
Anyway, I'm getting the "Failed to open directory: SoldierName/" error.
I downloaded the apk and installed it.
Next, I created an sdcard1\OpenXcom\Data. In it I pasted GEODATA, GEOGRAPH, Language, MAPS, Resources, ROUTES, Ruleset, Shaders, SoldierName, SOUND, TERRAIN, UFOGRAPH, UFOINTRO, and UNITS.
I then ran the apk and got the DOS-like screen. Anyone have any ideas as to what I'm doing wrong and how I may correct it?