hi, Preonix, android wallet can backup and restore wallet, but can not import the private key now, maybe the feature will be added in the future.
the issue you reported will be fixed in the next android version.
release of 10.3.3 will be delayed, it can not be released on Friday, hope it will be released before next Monday. there are some issues found while testing.
Was tested android wallet left a good impression. Of defects inscription Bitcoin likely due localization Russian. When you add addresses to the address book off (label in Russian)
How to import the private key?