Introducing Honeycomb

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What the Honeycomb UI contains and what else arrived in the Android 3.0 release for developers.

What the Honeycomb UI contains and what else arrived in the Android 3.0 release for developers.

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  • 1. Introducing Honeycomb   
  • 2. Elements of the HC Look & Feel ● Status Bar – At the bottom now – Soft keys for HOME, BACK, etc. ● Action Bar – Combination toolbar, options menu, context menu, and title bar ● Holographic Theme   
  • 3. Enabling the HC Look & Feel ● <uses-sdk android:targetSdkVersion=“11” /> – Gives your widgets the Holographic theme, unless you overrode it – Replaces a MENU button in status bar with your options menu in the action bar   
  • 4.    
  • 5. Adding to the Action Bar ● android:showAsAction – ifRoom or always – withText for text+icon vs. just icon ● android:actionLayout – Layout resource to inflate into the action bar instead of a toolbar button   
  • 6.    
  • 7.    
  • 8. Fragments: What and Why ● What: Layer Between Activity and View – Designed to create internally-reusable facets of your UI, to be combined based upon screen size – Can animate on/off, have own BACK stack ● Why: Future Honeycomb-on-Phones – Tries to simplify having single UI definition that scales up for larger screens   
  • 9. Fragments: User Experience ● Lists With Selection – Normally, touch mode is an action ● Lists Plus Detail Simultaneously – ...on tablets – Phones will have as separate activities due to limited screen space ● Intra-Activity BACK Operation   
  • 10. Fragments: The Mechanics ● Create Fragment Classes – Extend Fragment, ListFragment, etc. – Override onCreateView() to define content ● E.g., inflated layout – Lifecycle Methods ● onActivityCreated() ● onSaveInstanceState() ● Etc.   
  • 11. Fragments: The Mechanics ● Displaying Fragments – Embed in activity layouts via <fragment> ● Large/xlarge layouts have multiple fragments ● Small/normal layouts have single fragment – Add dynamically via FragmentManager – FragmentTransaction ● Add, replace, remove, etc. ● Configure if “transaction” can be reversed via BACK   
  • 12. Fragments: The Mechanics ● Problem: Backwards Compatibility – Fragments firmly in API Level 11 – Backwards-compatible fragment implementation in the works ● Android library project ● Wrapper API that uses Honeycomb if available or internal implementation if not ● Not available at the time of this writing   
  • 13. App Widgets in Honeycomb ● Adapter-Driven Widget Contents – ListView, GridView, StackView, AdapterViewFlipper – RemoteViewsService ● Preview Images – Shown to user before app widget is added to screen   
  • 14. Notifications in Honeycomb ● What We Gain – Control over Growl-style large pop-ups ● What We Lose – number ● What Users Lose – Single clear button – now individual close buttons per Notification   
  • 15. Animations in Honeycomb ● Animate Arbitrary Properties – E.g, change colors – ValueAnimator and ObjectAnimator – New view properties for rotation, pivot, scale, etc. – Can generally replace much of classic animation framework (translation, rotation, etc.)   
  • 16. The Rest of the HC Story ● android:hardwareAccelerated="true" – Speeds things up, but false by default for compatibility ● Rich Clipboard Contents ● Drag-and-Drop – For moving data, not widgets – Same engine as new clipboard contents   
  • 17. The Rest of the HC Story ● Loaders for asynchronous loading of data – Particularly for use with content providers ● New widgets: CalendarView, SearchView, NumberPicker, etc. ● Renderscript for 3D work ● Touch events across widgets ● And on, and on, and on...   
  • 18. Ice Cream Sandwich ● Current Working Theory – Android 3.1 – Summer 2011 – Honeycomb UI, other Android 3.0 goodness brought to phones ● Not everything, due to screen size or lower hardware requirements