DATA PERSISTENCE IN ANDROID OPERATING SYSTEM

DATA PERSISTENCE IN ANDROID OPERATING SYSTEM

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

2. Is Android
supports only
SQLITE?
????
???N
O
NO

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.

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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 providersC
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CHECK THE
CODE OF
CONTENT
PROVIDER

50. Internal
Storage
Hira saeed(46)

56. External
Storage
Hamna Nasir(55)

61. SQLITE
Tehseen Iqbal(06)