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What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
What's New in Jelly Bean
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What's New in Jelly Bean

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from the Big Android BBQ 2012

from the Big Android BBQ 2012

Published in: Technology
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  • 1. Big Android BBQ 2012Whats New in Jelly Bean Copyright © 2012CommonsWare, LLC
  • 2. Project Butter● UI Updates @ 60 frames/second● Objective: smoother UI updates – Especially animations● Transparent to developers – No code changes to “opt into” Butter effects● Google I/O 2012: “For Butter or Worse” Copyright © 2012CommonsWare, LLC
  • 3. Project Butter Ramifications● Only ~16ms Per Frame – Your code on the main application thread – Framework code – Other interruptions (e.g., background process)● Net: Get Off the Main Application Thread! – Anything taking more than a few milliseconds needs to move to background thread or be executed incrementally Copyright © 2012CommonsWare, LLC
  • 4. Project Butter & Choreographer06-29 23:11:17.796: I/Choreographer(691): Skipped 647 frames!The application may be doing too much work on its main thread.● Information Message in LogCat – “Skipped N frames” * 16ms = amount of time you took on main application thread – The more frames skipped, the more likely it is the user will notice ● UI frozen and not responsive ● Animation/scrolling hiccups Copyright © 2012CommonsWare, LLC
  • 5. Expandable Notifications● Alternative Visual Representation – Taller, room for more text or image – Optional action buttons● When Appears – When at top of drawer – User expansion via two-finger swipe gesture Copyright © 2012CommonsWare, LLC
  • 6. Expandable Notifications● Styles – BigTextStyle: larger amount of prose – BigListStyle: subject lines, news headlines, etc. – BigPictureStyle: shared photos, etc.● Actions – Up to three – Immediate operations with fewer clicks Copyright © 2012CommonsWare, LLC
  • 7. Expandable Notifications● Creating Them – Use Notification.Builder or NotificationCompat.Builder – Create regular Notification – Wrap in a “big” style Notification ● Wrapper “inherits” values from wrapped one (e.g., timestamp) ● Android uses one or the other based upon circumstances Copyright © 2012CommonsWare, LLC
  • 8. READ_LOGS Regression● Before – No API for reading LogCat contents – SDK apps could hold READ_LOGS and use undocumented means instead● Now – No API for reading LogCat contents – Only firmware apps can hold READ_LOGS – Default: can only read own messages Copyright © 2012CommonsWare, LLC
  • 9. READ_LOGS Regression● Effects – Cannot report system error messages via ACRA and kin – Limits native IDEs (AIDE, etc.), as they cannot show messages from apps they create● Reasons – Privacy: too much crap getting logged – Security: reduce blocking attacks Copyright © 2012CommonsWare, LLC
  • 10. READ_EXTERNAL_STORAGE● New Permission – Required if you are reading from external storage and do not already hold WRITE_EXTERNAL_STORAGE● Not Enforced By Default – Jelly Bean: enabled in Developer Options – K+: possibly enabled by default Copyright © 2012CommonsWare, LLC
  • 11. READ_EXTERNAL_STORAGE● Reason: Privacy – Addressing the “any app has access to our photos” complaint● Warning: No Grandfathering – No indication that apps with low targetSdkVersion will be granted this permission by default – Users can toggle this on now Copyright © 2012CommonsWare, LLC
  • 12. Other Notable Changes● Full Bi-Directional Text Support (no, really, honest, we got it this time!) – Also custom keymaps, to surface other characters more easily● Fully-Resizable App Widgets – And your code gets to find out, too! – Also get GridLayout and ViewStub support● Improved Accessibility Copyright © 2012CommonsWare, LLC
  • 13. Other Notable Changes● Android Beam – Bulk content transfer, kicked off by NFC, completed by Bluetooth● Google Cloud Messaging – Permanent replacement for Labs C2DM – Various improvements, still free Copyright © 2012CommonsWare, LLC
  • 14. Other Notable Changes● More Changes for Task Navigation● More Options for Lights Out/Full Screen● Service Discovery (WiFi, WiFi Direct)● Audio Improvements (e.g., codec enumeration)● Better WebView● Etc. Copyright © 2012CommonsWare, LLC
  • 15. Jelly Bean/API Level 16 Uptake● Presently: 1.8% (as of October 1, 2012)● Short-Term Growth – Upgrades from manufacturers – Gingerbread contract expirations – Holiday season sales● Predictions – 10% by February 1, 2013 – 25% by June 1, 2013 Copyright © 2012CommonsWare, LLC

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