1.
Building TimePiece<br />Arpit Mathur<br />http://twitter.com/arpit<br />

2.
What is TimePiece<br />World Time lookup without API calls<br />Visually interesting (fun with animation)<br />Open Source (under the MIT license)<br />

3.
Technical breakdown<br />Local SQLite database with City / Java TimeZone Id mappings<br />JODA DateTime library<br />Search<br />Custom List Renderers<br />The usual app stuff:<br />User Preferences<br />Menus<br />Intro screens<br />Context menus<br />

4.
Implementing ContentProviders with local SQLite databases<br />

5.
Steps<br />Add SQLite to your assets folder<br />Copy the database to your app’s data folder<br />Open the database (extend SQLiteOpenHelper)<br />Create a ContentProvider from this Database<br />

6.
Code:<br />DataBaseHelper<br />TimeZoneLookupService<br />CitySearchSuggestionProvider<br />

7.
Create a searchable config xml file<br />Create an Activity to handle the search<br />Add the Search config and activity to the activity that you want to trigger search on<br />Implementing Search<br />

8.
Search config (in res/xml)<br />

9.
Search Activity<br />

10.
Integrate with Main Activity<br />

11.
Mind the stacks!<br />Activity LaunchModesdeclared in Activity:<br />multiple<br />singleTop<br />singleTask<br />singleInstance<br />

12.
Replacing the Activity with Suggestions<br />res/searchable.xml<br />CitySearchSuggestionProvider<br />

13.
Return format<br />

14.
Building Custom Lists<br />Create a List View or a ListActivity<br />Create an Adapter for populating the List<br />Populate the List Adapter<br />Refresh the Adapter every 60 seconds<br />

15.
Code<br />MyLocationsActivity<br />MyLocationsDataAdapter<br />

16.
A little deeper into Animation<br />

17.
Loading Animation XMLs<br />

18.
Creating animation objects at runtime<br />

19.
Creating custom animations<br />Extend Animation<br />Override applyTransform<br />

20.

21.
Remember: <br />Animations only effect the rendering buffers so objects don’t actually change in position itself<br />If you don’t set setFillAfter, the animated object will return to its location/transformation as before animation started <br />Leverage LayoutAnimations as well as regular animations<br />

22.
Releasing to the Market<br />Use Android Asset Studio to create your icons<br />Broken Market search: Joining words is probably a bad idea<br />When adding images to your app’s description, make sure the first one is most representative (for third party market indexers like Chomp)<br />

23.
Links<br />TimePiece:<br />https://market.android.com/details?id=com.arpitonline.worldclock<br />Packing local SQLite databases:<br />http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/<br />Android Asset Studio:<br />http://android-ui-utils.googlecode.com/hg/asset-studio/dist/index.html<br />