TabTrader is hands down the best trading app on Google play (4.6* rating), making it easy to go about your day without the urge to look up quotes and place trades from a desktop.
By connecting your exchange account(s) you will be able to monitor your balances in real time, analyse past prices and manage orders right from your Android smartphone.
Currently the following exchanges are supported: Coinbase, Bitstamp, ANXPRO, HitBtc, BTC-E, BTCChina, Huobi, Kraken, ItBit, Bitbay, Cryptsy, Bter, Bitfinex, Clevercoin, Bitmarket, Poloniex. New ones added with every update.
Order book and chart trading capabilities reduce order input time substantially giving you an edge over peers and in the world where getting there first is everything, it could make a difference between a profit and a loss.
What’s changed since previous post:
Margin trading support and multiple bug fixes
Account opening via API for selected exchanges
Exchange API keys encryption
Newsfeed aggregates all relevant news in one tab
Unlimited number of price alerts by push
Improved overall data efficiency (3 mb/month with average use)
PIN protection
Completely FREE with no annoying ads

To address any security concerns: please note that only permissions to buy, sell and view balance are needed, thus your funds are unhackable.
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Yes, I think the trader tab is a very good mobile app, I'm also a tabtrader user, it really helps me to see the android device market situation and I'm very happy to use it.