These are a few of the best android Bitcoin and altcoin cryptocurrency trading tools and alerts.
zTrader
zTrader is a fully-featured, lightweight, and secure trading client for the largest Bitcoin and altcoin exchanges. Capable of trading hundreds of digital currencies on 17 different exchanges, zTrader has everything you need to trade right from your Android device.
https://play.google.com/store/apps/details?id=co.bandicoot.ztrader&hl=en_GB
Ethereum stats
Tired of checking multiple places for all the Ethereum prices, mining information, blog posts and charts?
Install this app and have all the Ethereum information right at your finger tips:
https://play.google.com/store/apps/details?id=com.christiangrieger.ethereumstats&hl=en_GB
Bitcoin Checker - * Not only for BTC, but for all CRYPTO and ALT *
Monitor the most RECENT prices of all CRYPTO-currencies on over 80 exchanges from all around the world. Watch the prices displayed in readable notifications right in your status bar. Along with price check, several alarm conditions can alert you about current price changes/level (either by sound or customized Text-to-Speech announcement). We put a large emphasis on having great contact with our users and give them ability customize almost every part of app according to their needs.
Please understand that this app is NOT for drawing charts!
https://play.google.com/store/apps/details?id=com.mobnetic.coinguardian&hl=en_GB