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发帖数: 1034 | 1 http://android-developers.blogspot.com/
20 October 2014
By Ankur Kotwal, Developer Advocate
Android 5.0 Lollipop is the biggest update of Android to date, introducing
an all new visual style, improved performance, and much more. Android 5.0
Lollipop also extends across screens big and small, including phones,
tablets, wearables, TVs and cars, to give your users access to information
when they need it most.
To get you started on developing and testing on Android 5.0 Lollipop, here
are some of the developer highlights with links to related videos and
documentation.
User experience
Material design for the multiscreen world — Material Design is a new
approach for designing apps in today’s multi-device world that takes a
comprehensive strategy to visual, motion, and interaction design across a
number of platforms and form factors. Android 5.0 brings Material Design to
the platform, with a full set of tools for implementing material design in
your apps. The system is incredibly flexible, allowing your app to express
its individual character and brand with bold colors and a variety of
responsive UI patterns and themeable elements.
Enhanced notifications — New lockscreen notifications let you surface
content, updates, and actions to users at a glance, without needing to
unlock their device. Heads-up notifications let you display content and
actions in a small floating window managed by the system, no matter which
app is in the foreground. Notifications are refreshed for Material Design
and you can use accent colors to express your brand.
Concurrent documents in Overview — Now you can organize your app by
tasks and present these concurrently as individual “documents” on the
Overview screen. For example, instant messaging apps could declare each chat
as a separate document. Users can flip through these on the Overview screen
to find the specific chat they want and jump straight to it.
Performance
Android Runtime (ART) — Android 5.0 runs exclusively on the ART runtime
. ART offers ahead-of-time (AOT) compilation, more efficient garbage
collection, and improved development and debugging features. In many cases
it improves performance of the device, without you having to change your
code.
64-bit support — Support for 64-bit ABIs provides additional address
space and improved performance with certain compute workloads. Apps written
in the Java language can run immediately on 64-bit architectures with no
modifications required. NDK r10c includes 64-bit support, for apps and games
using native code.
Project Volta — New tools and APIs help you build battery-efficient
apps. Battery Historian, a tool included in the SDK, lets you visualize
power events over time and understand how your app is using battery. The
JobScheduler API lets you set the conditions under which your background
tasks and other jobs should run, such as when the device is idle or
connected to an unmetered network or to a charger, to minimize battery
impact. More in this I/O video.
OpenGL ES 3.1 and Android Extension Pack — With OpenGL ES 3.1, you get
compute shaders, stencil textures, and texture gather for your games.
Android Extension Pack (AEP) is a new set of extensions to OpenGL ES that
bring desktop-class graphics to Android including tessellation and geometry
shaders, and use ASTC texture compression across GPU technologies. More on
what's new for game developers in this DevBytes video.
WebView updates — We’ve updated WebView to support WebRTC, WebAudio
and WebGL will be supported. WebView also includes native support for all of
the Web Components specifications: Custom Elements, Shadow DOM, HTML
Imports, and Templates. WebView is now unbundled from the system and will be
regularly updated through Google Play.
Workplace
Managed provisioning and unified view of apps — to make it easier for
employees to have a single device for personal and work use, framework
enhancements offer a unified view of apps, notifications & recents across
work apps and personal apps. Profile owner APIs, in the workplace context,
let administrators create and manage work profiles and defined as part of a
new managed provisioning process. More in this I/O video.
Media
Advanced camera capabilities — A new camera API gives you new
capabilities for advanced image capture and processing. On supported devices
, your app can capture uncompressed YUV capture at full 8 megapixel
resolution at 30 FPS. You can also capture raw sensor data and control
parameters such as exposure time, ISO sensitivity, and frame duration, on a
per-frame basis.
Audio improvements — The sound architecture has been enhanced, with
lower input latency in OpenSL, the addition of multichannel-mixing, and USB
digital audio mode support. More in this I/O video.
Connectivity
BLE Peripheral Mode — Android devices can now function in Bluetooth Low
Energy (BLE) peripheral mode. Apps can use this capability to broadcast
their presence to nearby devices — for example, you can now build apps that
let a device function as a beacon and transmit data to another BLE device.
More in this I/O video.
Multi-networking — Apps can dynamically request networks based on
capabilities such as metered or unmetered. This is useful when you want to
use a specific network, such as cellular. Apps can also request platform to
re-evaluate networks for an internet connection. This is useful when your
app sees unusually high latency on a particular network, it can enable the
platform to switch to a better network (if available) sooner with a graceful
handoff.
Get started!
You can get started developing and testing on Android 5.0 right away by
downloading the Android 5.0 Platform (API level 21), as well as the SDK
Tools, Platform Tools, and Support Package from the Android SDK Manager.
Check out the DevByte video below for more of what’s new in Lollipop! |
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