Design Patterns for Tablets and Smartphones

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This is a talk I gave at AnDevCon. It talks about ways to take advantage of features introduced in Android 3.0 to create more modular and better looking apps.

This is a talk I gave at AnDevCon. It talks about ways to take advantage of features introduced in Android 3.0 to create more modular and better looking apps.

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Transcript

  • 1. Design Patterns for Tablets and Smartphones Michael Galpin, Bump Technologies
  • 2. About me• Apps! • Bump • eBay Mobile• Book! • Android in Practice • Chapter 15
  • 3. Agenda • Key Concepts • App Structure • Fragments • Goodies • Action Bar • Loaders • Eye Candy
  • 4. So you built an app...
  • 5. One app or two?•Re-use code & assets •Simpler logic•Build on Market presence •New platform features
  • 6. Library Projects
  • 7. Breakin’ it down App
  • 8. Breakin’ it downApp Tablet App Library
  • 9. What’s in a Library?• I/O: Networking, files, content • Data parsing• Models• Services, Receivers, Content Providers• Resources • Drawables, Strings
  • 10. Moving Targets
  • 11. <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.manning.aip.tabdroid" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="11" /> <supports-screens android:smallScreens="false" android:normalScreens="false" android:largeScreens="true" android:xlargeScreens="true" android:requiresSmallestWidthDp="500" />
  • 12. <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.manning.aip.tabdroid" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="11" /> <supports-screens android:smallScreens="false" android:normalScreens="false" android:largeScreens="true" API <= 12 android:xlargeScreens="true" android:requiresSmallestWidthDp="500" />
  • 13. <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.manning.aip.tabdroid" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="11" /> <supports-screens android:smallScreens="false" android:normalScreens="false" android:largeScreens="true" android:xlargeScreens="true" /> android:requiresSmallestWidthDp="500" API >= 13
  • 14. Not all tablets are created equally
  • 15. Screen Size Selectors
  • 16. Have your cake and eat it too
  • 17. Multiple APKsApp Tablet App Library
  • 18. Multiple APKs MyApp on the MarketApp Tablet App Library
  • 19. Fragments
  • 20. Stop me if you’ve heard this one
  • 21. Fragment
  • 22. Fragment
  • 23. Fragment
  • 24. Fragment
  • 25. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/details_container"> <fragment class="com.manning.aip.tabdroid.SectionDetailsFragment" android:id="@+id/section_list_fragment" android:visibility="gone" android:layout_marginTop="?android:attr/actionBarSize" android:layout_width="300dp" android:layout_height="match_parent" /> <fragment class="com.manning.aip.tabdroid.DealFragment" android:id="@+id/deal_fragment" android:layout_width="match_parent" android:layout_height="match_parent" /></LinearLayout>
  • 26. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/details_container" android:gravity="bottom"> <fragment class="com.manning.aip.tabdroid.DealFragment" android:id="@+id/deal_fragment" android:layout_marginTop="?android:attr/actionBarSize" android:layout_width="match_parent" android:layout_height="wrap_content" /> <fragment class="com.manning.aip.tabdroid.FilmstripFragment" android:id="@+id/section_filmstrip_fragment" android:visibility="gone" android:layout_width="match_parent" android:layout_height="300dp" android:layout_gravity="bottom"/></LinearLayout>
  • 27. Fragments: Not just for Tablets• “Smart” UI • Stateful • Mange data (state)• Communicates
  • 28. Spot the Fragment
  • 29. Communication & Couplingpublic class SectionDetailsFragment extends ListFragment { private void showDeal(int position){ app.currentItem = app.currentSection.items.get(position); DealFragment fragment = (DealFragment) getFragmentManager().findFragmentById(R.id.deal_fragment); fragment.showCurrentItem(); } @Override public void onListItemClick(ListView l, View v, int position, long id) { currentPosition = position; showDeal(position); }...}
  • 30. Who knows you & who do you know?Fragment Activity Fragment
  • 31. Use an Observerpublic class SectionDetailsFragment extends ListFragment { OnItemSelectedListener listener; public static interface OnItemSelectedListener { public void onItemSelected(Item item); } public void setOnItemSelectedListener( OnItemSelectedListener listener){ this.listener = listener; } private void showDeal(int position){ app.currentItem = app.currentSection.items.get(position); listener.onItemSelected(app.currentItem); }...}
  • 32. ...and Observepublic class DealsMain extends Activity implements OnItemSelectedListener{ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.home); SectionDetailsFragment sectionFragment = (SectionDetailsFragment) getFragmentManager().findFragmentById(R.id.section_list_fragment); sectionFragment.setOnItemSelectedListener(this); } @Override public void onItemSelected(Item item) { DealFragment fragment = (DealFragment) getFragmentManager().findFragmentById(R.id.deal_fragment); fragment.showItem(item); }...}
  • 33. QueuesFragment Activity Fragment inbound outbound
  • 34. QueuesFragment Activity Fragment inbound outbound
  • 35. Queues (Handlers)Fragment Activity Fragment inbound outbound
  • 36. But I have to supportAndroid 2.1
  • 37. The Action Bar
  • 38. ActionBar Essentials• Replaces Menu• Can be top & bottom in ICS• Not available in Compatibility Package • Helper for menus -> ActionBar
  • 39. Loaders
  • 40. Threads
  • 41. HandlersThreads
  • 42. AsyncTask HandlersThreads
  • 43. AsyncTaskLoader AsyncTask HandlersThreads
  • 44. Why do I need Loaders? • Encapsulates • Loading of data • Caching of data • Updates to data • Cursors and Async
  • 45. Eye Candy
  • 46. Drag and Drop
  • 47. class BoxDragListener implements OnDragListener{ boolean insideOfMe = false; Drawable border = null; Drawable redBorder = getResources().getDrawable(R.drawable.border3); @Override public boolean onDrag(View self, DragEvent event) { if (event.getAction() == DragEvent.ACTION_DRAG_STARTED){ border = self.getBackground(); self.setBackgroundDrawable(redBorder); } else if (event.getAction() == DragEvent.ACTION_DRAG_ENTERED){ insideOfMe = true; } else if (event.getAction() == DragEvent.ACTION_DRAG_EXITED){ insideOfMe = false; } else if (event.getAction() == DragEvent.ACTION_DROP){ if (insideOfMe){ // add to container } else if (event.getAction() == DragEvent.ACTION_DRAG_ENDED){ self.setBackgroundDrawable(border); } return true; }}
  • 48. public class DndActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.grid); findViewById(R.id.topLeft).setOnDragListener(new BoxDragListener()); findViewById(R.id.bottomLeft).setOnDragListener(new BoxDragListener()); findViewById(R.id.topRight).setOnDragListener(new BoxDragListener()); findViewById(R.id.bottomRight).setOnDragListener(new BoxDragListener()); }... ImageView imgView = (ImageView) recycledView; imgView.setOnLongClickListener(new OnLongClickListener(){ @Override public boolean onLongClick(View view) { ClipData data = ClipData.newPlainText("foo","bar"); DragShadowBuilder shadowBuilder = new DragShadowBuilder(owner); owner.startDrag(data, shadowBuilder, owner, 0); return true; } });}
  • 49. AnimatorsImageView backgroundImage = (count % 2 == 0) ? rightSlide : leftSlide;ObjectAnimator anim = ObjectAnimator.ofFloat(backgroundImage, "alpha", 0.0f, 1.0f);anim.addListener(new AnimatorListenerAdapter(){ public void onAnimationEnd(Animator animator){ nextSlide(); }});