This document discusses different options for data persistence in Android applications. It explains that persistence allows data to survive after the creating process ends by writing to non-volatile storage. The main options covered are shared preferences for small chunks of data, file systems for internal and external storage, and SQLite databases to allow relational data through a database management system. Code examples are provided for shared preferences and content providers.

1. Data
persistence in
Android
CS-6TH
E
AYESHA JAVED (30)
Hira Saeed(46)
Hamna Nasir(55)
Tehseen Iqbal(06)

2. Is Android
supports only
SQLITE?
????
???
NONO

3. What is Data persistence?
• Persistence is "the continuance of an effect after its
cause is removed". In the context of storing data in a
computer system, this means that the data survives after
the process with which it was created has ended. In
other words, for a data store to be
considered persistent, it must write to non-volatile
storage

4. WHY Persisting data ?
• Persisting data is an important topic in application
development, as users typically expect to reuse data in the
future. For Android, there are primarily Four basic ways of
persisting data:
• A lightweight mechanism known as shared preferences to save
small chunks of data
• Traditional file systems (Internal)
• External systems (Flash,drive)..
• A relational database management system through the
support of SQLite databases

5. Android Storage Options:-

6. Shared
Preferences

7. s

17. Shared preferences
internal structure
• Shared preferences internally has an in-memory storage on
top of disk storage. Every operation goes through in-memory
storage first and then to the disk.
• In-memory storage is basically a HashMap which allows O(1)
runtime complexity for all operations.

20. V

26. CHECK THE
CODE OF
SHARED
PREFERENCES
CHECK THE
CODE OF
SHARED
PREFERENCES

27. Content
Provider
Ayesha javed(30)

42. Cursor cursor =
getContentResolver().query(Uri.parse(queryUri), projection,
selectionClause, selectionArgs, sortOrder);

44. • <provider android:name=".WordListContentProvider"
android:authorities="com.android.example.wordlistsqlwithco
ntentprovider.provider" android:exported="true"/>

46. ``

49. • shared preferences are the location where you can store the
secret information for your app, like setting cookies in the
browser, this can be used for login credentials and other.
• where as content provider stores and retrieves the data and
make it available to other applications also. like suppose you
want to access the contacts available in the android phone,
they can be accessed by content providers
CHECK THE
CODE OF
CONTENT
PROVIDER
CHECK THE
CODE OF
CONTENT
PROVIDER

50. Internal
Storage
Hira saeed(46)

56. External
Storage
Hamna Nasir(55)

61. SQLITE
Tehseen Iqbal(06)