Embedding an SQLite Database in an Android App
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Embedding an SQLite Database in an Android App

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

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

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    Embedding an SQLite Database in an Android App Embedding an SQLite Database in an Android App Presentation Transcript

    • 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
    • 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
    • Adding A Database Create a Class that extends SQLiteOpenHelper Override the Constructor Override the onCreate and onUpgrade Saturday 13 July 13
    • Create the Custom Class You need to override the onCreate and onUpgrade Custom class, notice there is an error, we need a constructor Saturday 13 July 13
    • Add A Constructor Added the constructor with Eclipse’s help Saturday 13 July 13
    • Define Fields Statement to create the database Database version, very important, used when upgrading Database name, and column name for the table Saturday 13 July 13
    • Modify Constructor Use database name , context and version for the constructor Saturday 13 July 13
    • Code onCreate Create the table, this runs once Saturday 13 July 13
    • Code onUpgrade NB, you will lose data, need better implementation to save user data Saturday 13 July 13
    • That’s it, we are done with that part Saturday 13 July 13
    • CRUD Saturday 13 July 13
    • CRUD Saturday 13 July 13
    • Implementing CRUD Instantiate the Database Helper Class Get a Writable / Readable Database Perform CRUD operations Saturday 13 July 13
    • Instantiate Database Helper Class Instantiate the helper class and get a writable database Declare an instance of the SQLiteDatabase Saturday 13 July 13
    • Insert into the Database Use the ContentValues class Use the various put* methods Use the db.insert statement Saturday 13 July 13
    • 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 Saturday 13 July 13
    • 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 Saturday 13 July 13
    • Let’s whack a record Saturday 13 July 13
    • 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 Saturday 13 July 13
    • 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 Saturday 13 July 13
    • Bind Results to ListView Define a SimpleCursorAdapter Extend ListActivity for the class setListAdapter Saturday 13 July 13
    • SimpleCursorAdapter Saturday 13 July 13
    • 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 Saturday 13 July 13
    • UI Make sure the id is type of @android:id/list Saturday 13 July 13
    • 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
    • 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