Boilr is an Android application which monitors cryptocurrencies and bullion prices, and triggers alarms according to user settings. You can see it in action at http://boilr.mobi. Download: preferably through F-Droid. You can also download the APK and check the source code at Boilr's GitHub. Boilr supports 2 alarm types:
Price Hit - Triggered when price crosses the alarm's upper or lower limit.
Price Change - Triggered when price changes more than X amount (in currency or percentage) in a specified time frame (e.g. 1 day).
Market data is retrieved directly from the exchanges using Wi-Fi or Mobile Data (if allowed). Boilr supports all exchanges available on libdynticker, as all their pairs.
PS. We would be grateful if any of you could contribute with a German translation.