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Working with databases in Android

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A description of a TODO-note application which uses the Android database. The application is due to Lars Vogel.

A description of a TODO-note application which uses the Android database. The application is due to Lars Vogel.

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  • 1. Software Engineering Large PracticalWorking with databases in Android Stephen Gilmore School of Informatics, University of Edinburgh October 17th, 2012 Stephen Gilmore Software Engineering Large Practical
  • 2. A database example In this lecture we will look at an example Android application which creates a database of TODO notes, with reminders of things which need to be done, and descriptions of these. The application is due to Lars Vogel (http://www.vogella.com). Stephen Gilmore Software Engineering Large Practical
  • 3. Lars Vogel example: TODOs Stephen Gilmore Software Engineering Large Practical
  • 4. A database example Stephen Gilmore Software Engineering Large Practical
  • 5. TodoDatabaseAdapter Stephen Gilmore Software Engineering Large Practical
  • 6. TodoDatabaseHelper (onCreate()) Stephen Gilmore Software Engineering Large Practical
  • 7. TodoDatabaseHelper (onUpgrade()) Stephen Gilmore Software Engineering Large Practical
  • 8. TodoDatabaseAdapter (open(), close()) Stephen Gilmore Software Engineering Large Practical
  • 9. The create, update, and delete methods Stephen Gilmore Software Engineering Large Practical
  • 10. The insert() method Stephen Gilmore Software Engineering Large Practical
  • 11. The update() method Stephen Gilmore Software Engineering Large Practical
  • 12. The delete() method Stephen Gilmore Software Engineering Large Practical
  • 13. Fetch data Stephen Gilmore Software Engineering Large Practical
  • 14. Create content values Stephen Gilmore Software Engineering Large Practical
  • 15. Resources Stephen Gilmore Software Engineering Large Practical
  • 16. Running the application When we run the application we are able to create a TODO note, and set its category to Urgent or Reminder. Stephen Gilmore Software Engineering Large Practical
  • 17. Running the TODOs application Stephen Gilmore Software Engineering Large Practical
  • 18. Editing a TODO item Stephen Gilmore Software Engineering Large Practical
  • 19. Setting category to “Urgent” Stephen Gilmore Software Engineering Large Practical
  • 20. TODOs application code We look at the application code to see how the Java code interacts with the XML layout and see how the database state is managed. Stephen Gilmore Software Engineering Large Practical
  • 21. TodoDetails (imports).14.20.png Stephen Gilmore Software Engineering Large Practical
  • 22. TodoDetails (onCreate).14.31.png Stephen Gilmore Software Engineering Large Practical
  • 23. Graphical layout of todo edit.xml.32.52.png Stephen Gilmore Software Engineering Large Practical
  • 24. Text of todo edit.xml.32.48.png Stephen Gilmore Software Engineering Large Practical
  • 25. Outline of todo edit.xml.32.48.png Stephen Gilmore Software Engineering Large Practical
  • 26. TodoDetails (populateFields).14.38.png Stephen Gilmore Software Engineering Large Practical
  • 27. Save state, onPause, onResume.14.48.png Stephen Gilmore Software Engineering Large Practical
  • 28. Save state.14.56.png Stephen Gilmore Software Engineering Large Practical
  • 29. TodosOverview (onCreate).15.04.png Stephen Gilmore Software Engineering Large Practical
  • 30. Options menu, item selected.15.10.png Stephen Gilmore Software Engineering Large Practical
  • 31. Options item selected.15.22.png Stephen Gilmore Software Engineering Large Practical
  • 32. Accessing the insert menu.16.16.png Stephen Gilmore Software Engineering Large Practical
  • 33. Inspecting the database During development we might have bugs in our code which cause problems with the database. In this case we would like to be able to see the content of the database and check that it is as we expect. We can use the Dalvik Debug Monitor Server (DDMS) to do this and we can also inspect the database using other tools for processing SQLlite databases. Stephen Gilmore Software Engineering Large Practical
  • 34. Dalvik Debug Monitor Server (DDMS).21.38.png Stephen Gilmore Software Engineering Large Practical
  • 35. File explorer in DDMS Stephen Gilmore Software Engineering Large Practical
  • 36. /data/data/de.vogella.android.todos/... Stephen Gilmore Software Engineering Large Practical
  • 37. Pulling a file from the device Stephen Gilmore Software Engineering Large Practical
  • 38. Pulling a file from the device Stephen Gilmore Software Engineering Large Practical
  • 39. Get the device file Stephen Gilmore Software Engineering Large Practical
  • 40. Inspecting the file with sqlite3 Stephen Gilmore Software Engineering Large Practical
  • 41. Inspecting the file with sqlite3 on DiCE Stephen Gilmore Software Engineering Large Practical
  • 42. Other tools for inspecting the database Numerous browsers exist for SQLite databases. The CellObject SQLite & XML Browser is an Eclipse plug-in tool built on top of Dalvik Debug Monitor Server (DDMS), intended for Android application developers. It is available from http://cellobject.net/ SQLite Manager is an add-on for Firefox which allows users to browse SQLite databases using the Firefox browser. It is available from https://addons.mozilla.org/en-US/ firefox/addon/sqlite-manager/ SQLite Database Browser allows users to create, design and edit database files compatible with SQLite using a familiar spreadsheet-like interface. It is available from http://sqlitebrowser.sourceforge.net/ Stephen Gilmore Software Engineering Large Practical
  • 43. Using LogCat As usual, the effect of Java exceptions and other problems will appear in the LogCat view. Stephen Gilmore Software Engineering Large Practical
  • 44. Debugs and errors displayed in LogCat.22.45.png Stephen Gilmore Software Engineering Large Practical
  • 45. Can filter messages displayed in LogCat.34.51.png Stephen Gilmore Software Engineering Large Practical
  • 46. Can use view menu to export messages.40.30.png Stephen Gilmore Software Engineering Large Practical

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