Database
- 2. WHY DATABASES ON ANDROID? Common usage for a database • Huge amounts of data • Convenient query language to obtain data • Accessed/modified by huge amount of users Applications: • backend for multi-tier web architecture, • backend for business process architectures like SAP • areas: banks, insurance companies, ... Android • Small scale architecture, little data, few applications ...
- 3. What is SQLite? • SQLite is Open Source Database embedded into Mobile Devices. • SQLite supports SQL syntax, transactions and prepared statements. • SQLite consumes low memory approx. 250Kbyte.
- 4. SQLite • Relational database with tables (DB schema) • Popular embedded database, here: integrated in Android • SQL interface + small memory footprint + decent speed • Native API not JDBC • Properties (from http://www.sqlite.org/different.html) • Zero configuration and serverless • Single database file & stable across platforms • Compact, public domain, readable source code • Manifest typing and variable length records
- 5. SQLite vs Content Provider • SQLite • Persistent storage of data • Data accessible to a single application (the owner) • Often wrapped by a Content Provider • Content Provider • Specialized type of data store to share data across apps • Exposes standardized ways to retrieve/manipulate data • Query with URI: <standard_prefix>://<authority>/<data_path>/<id> • Examples: content://browser/bookmarks, content://contacts/people • Built in
- 7. Make a demo project
- 9. Create Database Add that CREATE_TABLE_SQL into onCreate Method
- 12. Now in Main Activity
- 13. Add Button Click
- 14. Output
- 15. Now Get Data From Database
- 16. Add a Layout to Show Data in List
- 17. Add another Layout for List Row listrow.xml
- 19. Add Button Click On MainActivity Add another button name Show All Contact in our activity_main.xml with id:btnAllContact
- 20. Add getContacts() in DatabaseAdapter Class This method will return data from database in a Arraylist.
- 22. Make a Custom Adepter As you have done before in ListView Session Create a CustomAdapter to bind data in list adapter. Then set the adapter in our listview.
- 24. Now back in our ContactListActivity
- 25. Output