Key concepts that every Android developer needs to understand to be successful.

1. Getting Dirty With Android

2. Brent Edwards Senior Consultant with Magenic BrentE@magenic.com @brentledwards brentedwards.net

3. What We Will Cover Menus Layout Styles Lifecycle Management AsyncTask All while building a sample app

4. Assumptions Basic understanding of… Android Activities and Intents Resources

5. Menus

6. Menus 3 Flavors Options Menu Primary Menu Type Menu Button Pressed First 5-6 Options -> Icon Menu When 7+ options, Option 6+ -> Expanded Menu Context Menu Long Press Sub Menu

7. Menus Define menus in XML res/menu/ Inflate the XML resource in code

8. Menus [Demo]

9. Layout

10. Layout Defines what the UI looks like Where views are placed How big views are How views flow Made up of nested views

11. Layout 2 Ways to define layout XML Provides most flexibility Better separation of UI from logic Easier to visualize Programmatically Can be more difficult Best when coupled with XML and LayoutInflater

12. Layout - XML Valid XML file Each node maps to a view instance Attributes set properties on the view Layout File Convention Have .xml extension Named with all lowercase Placed in res/layout/ folder

13. Layout Most Useful Layout Objects LinearLayout RelativeLayout

14. Layout - LinearLayout Views are stacked [horizontally|vertically]

15. Layout - LinearLayout Why it is so useful Simple to use Easy to understand at a glance Can leverage weight for children to scale proportionally

16. LinearLayout [Demo]

17. Layout - RelativeLayout Views specify their position relative to parent, other views or both

18. Layout - RelativeLayout Why it is so useful Very versatile Scales very well Handles rotation easily

19. RelativeLayout [Demo]

20. Styles

21. Styles Specifies look and format for views Separates design from content Collection of properties Font Size Font Color Background Color Padding Margin Much more

22. Styles Adds consistency to UI Similar to CSS

23. Styles Styles file convention Have .xml extension style.xml Placed in res/values/

24. Style [Demo]

25. Lifecycle Management

26. Lifecycle Management Applications have a lifecycle Essentially Three States Active / Running Paused Stopped

27. Lifecycle Management

28. Lifecycle Management Stopped Activities can be killed Then recreated when brought to front Activities with state need to be serialized onPause() onSaveInstanceState()

29. Lifecycle Management [Demo]

30. AsyncTask

31. AsyncTask Tasks run asynchronously Doesn’t freeze UI Good for long running tasks Web requests

32. AsyncTask Defined by 3 generic types Params Progress Result

33. AsyncTask 4 Steps onPreExecute Executes on UI thread doInBackground Executes the actual task on background thread onProgressUpdate Optionally updates user on progress on UI thread onPostExecute Executes on UI thread

34. AsyncTask Rules Task must be created in UI thread execute must be invoked from UI thread Tasks can only be executed once Don’t call onPreExecute, onPostExecute, doInBackground or onProgressUpdate manually

35. AsyncTask [Demo]

36. Dialogs

37. Dialogs Types AlertDialog ProgressDialog DatePickerDialog TimePickerDialog Override Dialog class to create Custom Dialogs

38. Dialogs To show a Dialog Simple way More complex way Override onCreateDialog(int) Call showDialog(int)

39. Dialogs [Demo]

40. Valuable Links Fundamentals http://developer.android.com/guide/topics/fundamentals.html Menus http://developer.android.com/guide/topics/ui/menus.html Layout http://developer.android.com/guide/topics/ui/declaring-layout.html Styles http://developer.android.com/guide/topics/ui/themes.html AsyncTask http://developer.android.com/reference/android/os/AsyncTask.html Dialogs http://developer.android.com/guide/topics/ui/dialogs.html

41. Questions?

42. Brent Edwards Senior Consultant with Magenic BrentE@magenic.com @brentledwards brentedwards.net