数据存储

1. Shared Preferences -- store private primitive data in key-value pairs
2. Internal Storage -- private data on the device memory
3. External storage -- public data on the shared external storage
4. SQLite Databases -- structed data in a private database
5. network connection -- store data on the web with your own network server

http://docs.eoeandroid.com/guide/topics/data/data-storage.html