Android Storage MAY 2013 Hu.Cai

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] Outline 1.Storage In General 2.SharedPreferences 3.File 4.Database 5.External Storage(SDCard and Network) 2

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] 1. Storage In General 3 APP StorageInternalSharedPreferencesFileDatabaseExternalSDCardNetwork

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] 2. SharedPreferences 4  Store private primitive data in key-value pairs, data type include: boolean,int,float,long,string  This data will persist across user sessions, even if your application is killed

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SharedPreferences Sample 5 Activity- A, write data Activity- B, read data

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SharedPreferences Sample 6 /data /data/package_name/shared_prefs/config.xml conclusion : light-weight option

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] 3. File 7  Store private data on the device memory.  When the user uninstalls your app, these files are removed.

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] Internal Storage Sample - File 8 Activity- A, write data Activity- B, read data

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] Internal Storage Sample - File 9 /data /data/package_name/files/test.txt conclusion : middle-weight option, depends on the space of your mobile internal storage.

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] 4. Database 10  Store structured data in a private database.  Any databases you create will be accessible by name to any class in the application, but not outside the application.

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SQLite 11 SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine.

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SQLite 12 Implements most of the SQL-92 standard for SQL but it lacks some features. 1.Partial support for triggers. 2.Can't write to views(delete,insert,update). 3.Can’t support full outer join, right outer join 4.Support limit to return records. 5.Case-sensitive

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SQLite  Create or Open database SQLiteDatabase openOrCreateDatabase (String name,int mode, SQLiteDatabase.CursorFactory factory) MODE_PRIVATE,MODE_WORLD_ READABLE,MODE_WORLD_WRITEABLE  Execute non-query SQL execSQL(String sql), support insert,update,delete,create,drop SQL.  Execute query SQL rawQuery(String sql), support select SQL.  Cursor to keep track of location within a resultset 13

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SQLite CRUD - SQLiteDatabase methods  public long insert (String table, String nullColumnHack, ContentValuesinitialValues).  delete(String table, String whereClause, String[] whereArgs)  query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy, String limit)  update(String table, ContentValues values, String whereClause, String[] whereArgs) 14

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SQLite Sample 15

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SQLite Sample 16

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] 5. External Storage(SDCard and Network) 17  Store public data on the shared external storage.  This can be a removable storage media (such as an SD card) or an internal (non-removable) storage.

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SDCard Storage Sample 18 Activity- A, write data Activity- B, read data

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] SDCard Storage Sample 19 /mnt/sdcard/sd.txt conclusion : you can write larger data to file. Such as a game application.

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] Network Storage 20  Store data on the web with your own network server.  Web service, HTTP  java.net.* ， Android.net.*

NAME OF PRESENTATION [CHANGE IN SLIDE MASTER] MONTH, YEAR [CHANGE IN SLIDE MASTER] Which is the best way to store it ? 21 1.How often will the data be accessed or updated? 2.The data is private? 3.Will the data be added to over time? 4.How will the data need to be used? 5.How much space your data requires?

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