Should be noted that there is a 10% developer fee that isn't mentioned in OP.
From Google Play Store:
A scrypt miner for mining litecoin through litecoinpool.org.
Features:
- Mine in the background
- Mine only when charging (Optional)
- Mine only on WIFI (Optional)
- Choose mining threads
- Stop mining on low battery (Optional)
Totally free, just donates one in ten shares to developer.
Disclaimer:
Mining is a very intense task that puts strain on your CPU and will make your device get very hot. The developer is not liable for any effect this app has on your device in any way.