nanoConverter

nanoConverter - a simple, small, fast and convenient open source currency converter for Android. You will always know the current rates for exchange and can easily transfer them between themselves.

Play Google: com.nanoconverter.zlab
Discuss on Forum: forum.motofan.ru/nanoConverter

Features:

• Convert currencies between themselves
• View and use the actual exchange rates
• Ability to work offline
• Courses can be viewed with respect to different currencies for your choice
• Currency exchange rates the central banks of various countries
• Your own rates
• Automatic updating of courses at your desire

36 currency (need more? Leave suggestions in the comments):

USD / EUR / CHF / GBP / JPY / UAH / RUB / MDL / BYR / PLN / LTL / LVL / AZN / AUD / AMD / BGN / BRL / HUF / DKK / INR / KZT / CAD / KGS / CNY / NOK / RON / XDR / SGD / TJS / TRY / TMT / UZS / CZK / SEK / ZAR / KRW

By default: automatic updates is turned off, to not spend your internet traffic.
Update spends a couple of KB of traffic (data obtained in XML).

In the settings you can enable two types of automatic updates, or update the rates manually (by default):
1) Update in the background - once application started, in background thread tries to update the currency exchange rates, while rates have not been updated to work with you previously saved the exchange rates.
2) Pre-update - at startup, the application immediately tries to update the rates. Then you can get to work.

First way: You can instantly get to work. Second way: You will only work with actual current exchange rates.