[Android] Data Storage - Save Persistent Data

1. Docs
• http://developer.android.com/guide/topics/data/data-storage.html
  
2. 4 Types
   Shared PreferencesStore private primitive data in key-value pairs.Internal StorageStore private data on the device memory.External StorageStore public data on the shared external storage.SQLite DatabasesStore structured data in a private database.Network ConnectionStore data on the web with your own network server.
   
3. Backup data to "Clound" storage
   Ref: http://developer.android.com/guide/topics/data/backup.html
   
4. File System
   
   • File
   • App private file
     
     • Context.openFileInput
     • Context.openFileOutput
     • Context.fileList
     • Context.deleteFile
     • Context.getExternalFilesDi
       
     • Context.getExternalCacheDir
       
   • Environment
     
   • xxx
     
5. xxx