NZB Leech is a very simple native usenet download client for android. Import nzb files into NZB Leech and download on the go! Supports repairing and extracting files. You need a paid newsgroup provider to use this app.

Support up to 6 usenet servers with a mix of primary and backup/fill servers. After 7 day trial you can only use 1 server.
SSL supported
password protected nzbs supported - add password to nzb name: "my nzb {{mypassword}}.nzb" or manually provide password when extracting from file tab (paid only)
automatic extract rar and 7zip (7 day trial)
integrated search sites (7 day trial)
add custom newznab websites (7 day trial)
add custom rss feeds (7 day trial)
view nfo and txt files (7 day trial)
run par repair manually from file tab (7 day trial)
run extract manually from file tab (7 day trial)
settings are restored on reinstall in Android 6.0+ if turned on in Android Settings -> Backup & reset
Background downloading supported even when phone is sleeping
Indicates which files are incomplete files (in red text)
Newly downloaded media passed to Android on download success

Troubleshoot donation (in app purchase): https://goo.gl/GSpdXv

Nzb Leech is on twitter!
http://twitter.com/nzbleech