In this session we demonstrate how to use and create an android app with an sqlite database backend storage

1. Using SQLite database in
Android Apps
Presented @ Cape Town Android Meetup
Joseph Kandi
Peruzal (PTY) LTD
Email: joseph@peruzal.co.za
Web: http://www.peruzal.co.za
Facebook: http://www.facebook.com/peruzal
July 13 2013
Saturday 13 July 13

2. Take Aways
Add persistence to an Android App
Use custom helper classes
Perform CRUD(Create, Read, Update, Delete)
Use ADB shell with sqlite3
Use SimpleCursorAdapter
Bind Data to a ListView
Saturday 13 July 13

3. Adding A Database
Create a Class that extends SQLiteOpenHelper
Override the Constructor
Override the onCreate and onUpgrade
Saturday 13 July 13

4. Create the Custom Class
You need to override the onCreate
and onUpgrade
Custom class, notice there is an
error, we need a constructor
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5. Add A Constructor
Added the constructor with Eclipse’s
help
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6. Define Fields
Statement to create the database
Database version, very important, used
when upgrading
Database name, and column name for
the table
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7. Modify Constructor
Use database name , context and
version for the constructor
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8. Code onCreate
Create the table, this runs once
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9. Code onUpgrade
NB, you will lose data, need better
implementation to save user data
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10. That’s it, we are done with that
part
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11. CRUD
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12. CRUD
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13. Implementing CRUD
Instantiate the Database Helper Class
Get a Writable / Readable Database
Perform CRUD operations
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14. Instantiate Database Helper
Class
Instantiate the helper class and get a
writable database
Declare an instance of the
SQLiteDatabase
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15. Insert into the Database
Use the ContentValues class
Use the various put* methods
Use the db.insert statement
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16. Perform Insert
Operation
Instantiate an object type
ContentValues, and add the values to
insert into the database
Perform the insert operation.
Returns 1 if successful otherwise an
arbitrary number
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17. Let’s Read
Columns we are interested in, food
idea to limit to only what’s needed,
also define sort ordering
Run query against database and
return a Cursor
NB move to first row before stating
to read
Get column by names instead of
column number
Read until the end
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18. Let’s whack a record
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19. Delete a row
Define a constraint first, equivalent of
the WHERE clause in SQL
Perform the delete, and note the
return. Returns 0 if no rows are
deleted, otherwise returns the number
of rows deleted
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20. Update
Define a constraint first, equivalent of
the WHERE clause in SQL
Use ContentValues class to fill in new
details
Perform insert and check for the
return type, greater than 0 means
success
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21. Bind Results to ListView
Define a SimpleCursorAdapter
Extend ListActivity for the class
setListAdapter
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22. SimpleCursorAdapter
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23. Instantiate an Adapter
Define columns to glue from the
database to the ListView Define the UI id’s to glue to the
database columns
Use the current content, the android
built in layout to glue the database
columns to the ListView UI
Make the link here, and don’t forget
to close the database
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24. UI
Make sure the id is type of
@android:id/list
Saturday 13 July 13

25. Thanks for your time
By the way we an have Android Development
Essentials Course on special running from the
29th - 31st of July - “Shameless marketing”
http://www.peruzal.co.za
http://www.facebook.com/peruzal
Saturday 13 July 13

26. Thanks for your time
By the way we an have Android Development
Essentials Course on special running from the
29th - 31st of July - “Shameless marketing”
http://www.peruzal.co.za
Saturday 13 July 13