Programming Android
- 2. Links for later ● eclipse.org/ Integrated Development Environment for Java ● developer.android.com/ Complete developer’s guide and reference ● slidesha.re/soQgoZ These slides ● github.com/league/android2011/ Source code for my sample apps
- 3. Teach Yourself Java in 21 seconds ● All code is in the context of a class ● Class can contain fields, methods, inner classes ● Static pertains to class itself, not every object ● All objects are references, and can be null ● Inherit and override methods from base classes ● Import classes from library packages ● The rest is mostly the same as C/C++/C# ● Beginners should use an IDE, such as Eclipse
- 4. Eclipse
- 5. Eclipse toolbar Run » Run Android SDK Android Virtual (Ctrl+F11) Manager Device Manager
- 6. AVD, AVD, wherefore art thee?
- 8. Importing an Eclipse project ● Download: http://bit.ly/liu-android-zip ● Eclipse menu: File » Import ● Import source: General » Existing Projects
- 9. Importing an Eclipse project ● Select archive file: browse to downloaded league-liu-android-blahblah.zip ● Select all; Finish
- 10. open FloodPuz » FloodPuzActivity
- 12. Check progress in console
- 13. Check progress in console
- 14. Activities ● Roughly: each UI screen in your app is an activity
- 15. Activities ● Multiple activities sequenced using back stack
- 16. Layouts, views, & widgets
- 17. Layouts, views, & widgets
- 19. Starting a new project ● File » New » Project ● Android » Android Project (Next) ● Project name: MyApp (Next) ● Target: Android 4.0 (Next) ● Package name: net.liucs (Next) ● Finish
- 20. Initial files
- 22. XML Layout editor ● Drag a button onto the layout ● Right-click “hello” text, edit ID
- 23. Access widgets in Java code Source » Organize Imports (Ctrl+Shift+O) to fix
- 24. Access widgets in Java code Or, get this code at https://gist.github.com/1410641
- 25. Next steps ● Try to extend my projects, especially SketchBot ● Additional colors ● Draw shapes instead of just lines ● Save drawing across application switch
- 26. Docs are your friends