Android - Open Source Bridge 2011


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Open Source Bridge
Portland, Oregon
June 22, 2011

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Android - Open Source Bridge 2011

  1. 1. AndroidSean SullivanJune 22, 2011
  2. 2. • Introduction• OSB Android app• Android tablets• Android 3.x
  3. 3. iPhone Android
  4. 4. Android tablets
  5. 5. What’s new in Android 3.x?
  6. 6. • ‘holographic’ UI theme• Action Bar• Fragments• Drag and Drop• Digital Rights Management• and more...
  7. 7. ‘holographic’ UI
  8. 8. Action Bar
  9. 9. “The Action Bar is a widget for activities thatreplaces the traditional title bar at the top ofthe screen.By default, the Action Bar includes theapplication logo on the left side, followed bythe activity title, and any available itemsfrom the Options Menu on the right side.”
  10. 10. Action Bar
  11. 11. Fragments
  12. 12. “A Fragment represents a behavior or a portion of userinterface in an Activity. You can combine multiple fragmentsin a single activity to build a multi-pane UI and reuse afragment in multiple activities.You can think of a fragmentas a modular section of an activity, which has its ownlifecycle, receives its own input events, and which you canadd or remove while the activity is running.”
  13. 13. • Fragments decompose application functionality and UI into reusable modules• Add multiple fragments to a screen to avoid switching activities• Fragments have their own lifecycle, state, and back stack• Fragments require API Level "Honeycomb" or greater
  14. 14. <LinearLayout xmlns:android=""        android:orientation="horizontal"        android:layout_width="match_parent"        android:layout_height="match_parent">    <fragment class=""            android:id="@+id/titles" android:layout_weight="1"            android:layout_width="0px"            android:layout_height="match_parent" />    <FrameLayout android:id="@+id/details" android:layout_weight="1"            android:layout_width="0px"            android:layout_height="match_parent" />   </LinearLayout>
  15. 15. public static class TitlesFragment extends ListFragment {    private boolean mDualPane;    private int mCurCheckPosition = 0;    @Override    public void onActivityCreated(Bundle savedState) {        super.onActivityCreated(savedState); // do something here    }    @Override    public void onSaveInstanceState(Bundle outState) {        super.onSaveInstanceState(outState);        outState.putInt("curChoice", mCurCheckPosition);    }    @Override    public void onListItemClick(ListView l, View v, int pos, long id) {        // do something here    }}
  16. 16. Drag and drop
  17. 17. Renderscript
  18. 18. “The Renderscript rendering and computational APIsoffer a low-level, high performance means of carrying outmathematical calculations and 3D graphics rendering.”
  19. 19. New animation API
  20. 20. New JSON API
  21. 21. Digital Rights Management API
  22. 22. The same security issues that have led to piracyconcerns on the Android platform have made itdifficult for us to secure a common Digital RightsManagement (DRM) system on these devices. [...]Although we don’t have a common platformsecurity mechanism and DRM, we are able to workwith individual handset manufacturers to addcontent protection to their devices. November 2010
  23. 23. Unfortunately, this is a much slower approach and leads to a fragmented experience on Android, in which some handsets will have access to Netflix and others won’t.We will also continue to work with the Androidcommunity, handset manufacturers, carriers, andother service providers to develop a standard,platform-wide solution that allows content providersto deliver their services to all Android-based devices November 2010
  24. 24. New in Android 3.1• Open Accessory API• USB Host API• Input from mice, joysticks, gamepads• Resizable home screen widgets• Media Transfer Protocol (MTP)• Real-time Transport Protocol (RTP)
  25. 25. Application development
  26. 26. Android emulator
  27. 27. Emulator performance
  28. 28. Because the Android emulator must simulate the ARM instruction seton your computer and the WXGA screen is significantly larger than atypical virtual device, emulator performance is much slower than a realdevice. source:
  29. 29. In particular, initializing the emulator can be slow and can take severalminutes, depending on your hardware. When the emulator is booting,there is limited user feedback, so please be patient and wait until yousee the home screen (or lock screen) appear. source:
  30. 30. However, you dont need to boot the emulator each time you rebuildyour application—typically you only need to boot at the start of asession and keep it running. Also see the tip below for informationabout using a snapshot to drastically reduce startup time after the firstinitialization.Were working hard to resolve the performance issues and it willimprove in future tools releases. source:
  31. 31. Sample code
  32. 32. API differences
  33. 33.
  34. 34. Best practices
  35. 35.
  36. 36. What’s next?
  37. 37. Final thoughts• Android 3.1 is for tablets, not phones• XOOM, Galaxy Tab, G-Slate are available now• More tablets coming to market• Learn the Fragments API
  38. 38. Thank you