lollipop.jd revision a2f07a88aa92d60b28295e84f440dbb4025d3eeb
1page.title=Android Lollipop 2 3@jd:body 4 5 6 7 8 9 10 11 12 13 14 <div style="padding:0px 0px 0px 20px;float:right;margin:0 -10px 0 0"> 15 <img src="{@docRoot}images/home/l-hero_2x.png" srcset="{@docRoot}images/home/l-hero.png 1x, {@docRoot}images/home/l-hero_2x.png 2x" width="460" height="300" > 16 </div> 17 18 <div class="landing-docs" style="float:right;clear:both;margin:68px 0 2em 3em;"> 19 <div class="col-4 normal-links highlights" style="font-size:12px;"> 20 <h3 id="thisd" >Key Developer Features</h3> 21 <ul style="list-style-type:none;"> 22 <li><a href="#Material">Material design</a></li> 23 <li><a href="#Perf">Performance focus</a></li> 24 <li><a href="#Notifications">Notifications</a></li> 25 <li><a href="#TV">Your apps on the big screen</a></li> 26 <li><a href="#Documents">Document-centric apps</a></li> 27 <li><a href="#Connectivity">Advanced connectivity</a></li> 28 <li><a href="#Graphics">High-performance graphics</a></li> 29 <li><a href="#Audio">More Powerful Audio</a></li> 30 <li><a href="#Camera">Enhanced Camera & Video</a></li> 31 <li><a href="#Work">Android in the Workplace</a></li> 32 <li><a href="#ScreenCapture">Screen capturing and sharing</a></li> 33 <li><a href="#Sensors">New types of sensors</a></li> 34 <li><a href="#WebView">Chromium WebView</a></li> 35 <li><a href="#Accessibility">Accessibility & Input</a></li> 36 <li><a href="#Battery">Tools for building battery-efficient apps</a></li> 37 </ul> 38 </div> 39</div> 40 41 42 43 44 45 46 47<p>Welcome to Android 5.0 Lollipop—the largest and most ambitious release for Android yet!</p> 48 49<p>This release is packed with new features for users and thousands of new APIs for developers. It extends Android even further, from phones, tablets, and wearables, to TVs and cars.</p> 50 51<p>For a closer look at the new developer APIs, see the 52<a href="{@docRoot}about/versions/android-5.0.html">Android 535.0 API Overview</a>. Or, read more 54about Android 5.0 for consumers at 55<a href="http://www.android.com/versions/lollipop-5-0/" 56>www.android.com</a>.</p> 57 58 59 60<p style=" 61 padding: 10px; 62 background: #eee; 63 width: 250px; 64 border: 1px solid #ccc; 65 margin-top: 20px; 66">To test your apps on a real device, flash a Nexus 5 or Nexus 7 with the <br> 67<a href="/preview/index.html#Start"><b>ANDROID PREVIEW SYSTEM IMAGE</b></a>.</p> 68 69 70<h2 id="Material">Material design</h2> 71 72<p>Android 5.0 brings <a href="http://www.google.com/design/spec">Material design</a> to Android and gives you an expanded UI toolkit for integrating the new design patterns easily in your apps. </p> 73 74 75 76<p>New <strong>3D views</strong> let you set a z-level to raise elements off of the view hierarchy and cast <strong>realtime shadows</strong>, even as they move.</p> 77 78 79<p>Built-in <strong>activity transitions</strong> take the user seamlessly from one state to another with beautiful, animated motion. The material theme adds transitions for your activities, including the ability to use <strong>shared visual elements</strong> across activities.</p> 80 81 82 83<div style="width:290px;margin-right:35px;float:left"> 84 <div class="framed-nexus5-port-span-5"> 85 <video class="play-on-hover" autoplay=""> 86 <source src="/design/material/videos/ContactsAnim.mp4"> 87 <source src="/design/videos/ContactsAnim.webm"> 88 <source src="/design/videos/ContactsAnim.ogv"> 89 </video> 90 </div> 91 <div style="font-size:10pt;margin-left:20px;margin-bottom:30px"> 92 <em>To replay the movie, click on the device screen</em> 93 </div> 94</div> 95 96 97<p>Ripple animations are available for buttons, checkboxes, and other touch controls in your app.</p> 98 99<p>A new system-managed processing thread called <strong>RenderThread</strong> keeps animations smooth even when there are delays in the main UI thread. </p> 100 101 102 103<h2 id="Perf">Performance focus</h2> 104 105<p>Android 5.0 provides a faster, smoother and more powerful computing experience.</p> 106 107<p>Android now runs exclusively on the new <strong>ART runtime</strong>, built from the ground up to support a mix of ahead-of-time (AOT), just-in-time (JIT), and interpreted code. It’s supported on ARM, x86, and MIPS architectures and is fully 64-bit compatible.</p> 108 109<p>ART improves app performance and responsiveness. Efficient garbage collection reduces the number and duration of pauses for GC events, which fit comfortably within the v-sync window so your app doesn’t skip frames. ART also dynamically moves memory to optimize performance for foreground uses. </p> 110 111<p>Android 5.0 introduces platform support for <strong>64-bit architectures</strong>—used by the Nexus 9's NVIDIA Tegra K1. Optimizations provide larger address space and improved performance for certain compute workloads. Apps written in the Java language run as 64-bit apps automatically—no modifications are needed. If your app uses native code, we’ve extended the NDK to support new ABIs for ARM v8, and x86-64, and MIPS-64.</p> 112 113<p>Continuing the focus on smoother performance, Android 5.0 offers improved A/V sync. The audio and graphics pipelines have been instrumented for more accurate timestamps, enabling 114video apps and games to display smooth synchronized content.</p> 115 116 117<h2 id="Notifications">Notifications</h2> 118 119<p>Notifications in Android 5.0 are more visible, accessible, and configurable. </p> 120 121<img src="{@docRoot}images/versions/notification-headsup.png" style="float:right; margin:0 0 40px 60px" width="300" height="224" /> 122 123<p>Varying notification details may appear <strong>on the lock screen</strong> if desired by the user. Users may elect to allow none, some, or all notification content to be shown on a secure lock screen. </p> 124 125<p>Key notification alerts such as incoming calls appear in a <strong>heads-up notification</strong>—a small floating window that allows the user to respond or dismiss without leaving the current app.</p> 126 127<p>You can now add <strong>new metadata</strong> to notifications to collect associated contacts (for ranking), category, and priority.</p> 128 129<p>A new media notification template provides consistent media controls for notifications with up to 6 action buttons, including custom controls such as "thumbs up"—no more need for RemoteViews!</p> 130 131 132 133<h2 id="TV">Your apps on the big screen</h2> 134 135<p><a href="http://developer.android.com/tv/index.html">Android TV</a> provides a complete TV platform for your app's big screen experience. Android TV is centered around a simplified home screen experience that allows users to discover content easily, with personalized recommendations and voice search.</p> 136 137<p>With Android TV you can now <strong>create big, bold experiences</strong> for your app or game content and support interactions with game controllers and other input devices. To help you build cinematic, 10-foot UIs for television, Android provides a <strong>leanback UI framework</strong> in the <a href="{@docRoot}tools/support-library/features.html#v17-leanback">v17 support library</a>.</p> 138 139<p>The <strong>Android TV Input Framework</strong> (TIF) allows TV apps to handle video streams from sources such as HDMI inputs, TV tuners, and IPTV receivers. It also enables live TV search and recommendations via metadata published by the TV Input and includes an HDMI-CEC Control Service to handle multiple devices with a single remote. </p> 140 141<p>The TV Input Framework provides access to a wide variety of live TV input sources and brings them together in a single user interface for users to browse, view, and enjoy content. Building a TV input service for your content can help make your content more accessible on TV devices.</p> 142 143 144 145<img src="{@docRoot}images/versions/recents_screen_2x.png" srcset="{@docRoot}images/versions/recents_screen.png 1x, {@docRoot}images/versions/recents_screen_2x.png 2x" style="float:right; margin:0 0 40px 60px" width="300" height="521" /> 146 147<h2 id="Documents">Document-centric apps</h2> 148 149<p>Android 5.0 introduces a redesigned Overview space (formerly called Recents) that’s more versatile and useful for multitasking.</p> 150 151<p>New APIs allow you to show separate activities in your app as individual documents alongside other recent screens.</p> 152 153<p>You can take advantage of concurrent documents to provide users instant access to more of your content or services. For example, you might use concurrent documents to represent files in a productivity app, player matches in a game, or chats in a messaging app. </p> 154 155 156 157<h2 id="Connectivity">Advanced connectivity</h2> 158 159<p>Android 5.0 adds new APIs that allow apps to perform concurrent operations with <strong>Bluetooth Low Energy</strong> (BLE), allowing both scanning (central mode) and advertising (peripheral mode).</p> 160 161<p>New <strong>multi-networking</strong> features allow apps to query available networks for available features such as whether they are Wi-Fi, cellular, metered, or provide certain network features. Then the app can request a connection and respond to connectivity loss or other network changes.</p> 162 163<p><strong>NFC</strong> APIs now allow apps to register an NFC application ID (AID) dynamically. They can also set the preferred card emulation service per active service and create an NDEF record containing UTF-8 text data.</p> 164 165 166 167<h2 id="Graphics">High-performance graphics</h2> 168 169<p>Support for <strong><a href="http://www.khronos.org/opengles/3_X/">Khronos OpenGL ES 3.1</a></strong> now provides games and other apps the highest-performance 2D and 3D graphics capabilities on supported devices. </p> 170 171<p>OpenGL ES 3.1 adds compute shaders, stencil textures, accelerated visual effects, high quality ETC2/EAC texture compression, advanced texture rendering, standardized texture size and render-buffer formats, and more.</p> 172 173 174<div class="figure" style="width:350px; margin:0 0 0 60px"> 175<img src="{@docRoot}images/versions/rivalknights.png" style="float:right;" width="350" height="525" /> 176<p class="img-caption">Gameloft's Rival Knights uses ASTC (Adaptive Scalable Texture Compression) from AEP and Compute Shaders from ES 3.1 to deliver HDR (High Dynamic Range) Bloom effects and provide more graphical detail.</p> 177</div> 178 179<p>Android 5.0 also introduces the <strong>Android Extension Pack</strong> (AEP), a set of OpenGL ES extensions that give you access to features like tessellation shaders, geometry shaders, ASTC texture compression, per-sample interpolation and shading, and other advanced rendering capabilities. With AEP you can deliver high-performance graphics across a range of GPUs.</p> 180 181 182<h2 id="Audio">More Powerful Audio</h2> 183 184<p>A new audio-capture design offers <strong>low-latency audio input</strong>. The new design includes: a fast capture thread that never blocks except during a read; fast track capture clients at native sample rate, channel count, and bit depth; and normal capture clients offer resampling, up/down channel mix, and up/down bit depth.</p> 185 186<p>Multi-channel <strong>audio stream mixing</strong> allows professional audio apps to mix up to eight channels including 5.1 and 7.1 channels.</p> 187 188<p>Apps can expose their media content and <strong>browse media</strong> from other apps, then request playback. Content is exposed through a queryable interface and does not need to reside on the device.</p> 189 190<p>Apps have finer-grain control over <strong>text-to-speech synthesis</strong> through voice profiles that are associated with specific locales, quality and latency rating. New APIs also improve support for synthesis error checking, network synthesis, language discovery, and network fallback.</p> 191 192<p>Android now includes support for standard <strong>USB audio</strong> peripherals, allowing users to connect USB headsets, speakers, microphones, or other high performance digital peripherals. Android 5.0 also adds support for <strong>Opus</strong> audio codecs.</p> 193 194<p>New <strong>{@link android.media.session.MediaSession}</strong> APIs for controlling media playback now make it easier to provide consistent media controls across screens and other controllers.</p> 195 196 197<h2 id="Camera">Enhanced Camera & Video</h2> 198 199<p>Android 5.0 introduces <strong>all new camera APIs</strong> that let you capture raw formats such as YUV and Bayer RAW, and control parameters such as exposure time, ISO sensitivity, and frame duration on a per-frame basis. The new fully-synchronized camera pipeline allows you to capture uncompressed full-resolution YUV images at 30 FPS on supported devices.</p> 200 201<p>Along with images, you can also capture metadata like noise models and optical information from the camera.</p> 202 203<p>Apps sending video streams over the network can now take advantage of H.265 <strong>High Efficiency Video Coding (HEVC)</strong> for optimized encoding and decoding of video data. </p> 204 205<p>Android 5.0 also adds support for <strong>multimedia tunneling</strong> to provide the best experience for ultra-high definition (4K) content and the ability to play compressed audio and video data together. </p> 206 207 208 209<img style="float:right; margin:0 0 40px 60px" 210 src="{@docRoot}images/android-5.0/managed_apps_launcher@2x.png" 211 srcset="{@docRoot}images/android-5.0/managed_apps_launcher@2x.png 2x" 212 alt="" width="300" /> 213 214<h2 id="Work">Android in the Workplace</h2> 215 216<p>In an enterprise work environment, an Android device can now be 217configured with separate profiles for both work and personal use.</p> 218 219<p>Employers can issue devices with a <em>device owner</em> app 220installed that can create and remove secondary profiles and configure 221global device settings. Alternatively, employees can bring their own 222device and the employer can add a secure work profile to the device.</p> 223 224<p>Notifications and apps for both the personal and work profile are 225visible in a unified view, and apps for work are badged so users can 226identify them easily. The data for each profile is always kept separate 227and secure from each other, including when the same app is used by both 228profiles.</p> 229 230 231 232<h2 id="ScreenCapture">Screen capturing and sharing</h2> 233 234<p>Android 5.0 lets you add screen capturing and screen sharing capabilities to your app. </p> 235 236<p>With user permission, you can capture non-secure video from the display and deliver it over the network if you choose.</p> 237 238 239<h2 id="Sensors">New types of sensors</h2> 240 241<p>In Android 5.0, a new <strong>tilt detector</strong> sensor helps improve activity recognition on supported devices, and a <strong>heart rate sensor</strong> reports the heart rate of the person touching the device. </p> 242 243<p>New <strong>interaction composite sensors</strong> are now available to detect special interactions such as a <em>wake up</em> gesture, a <em>pick up</em> gesture, and a <em>glance</em> gesture.</p> 244 245 246 247<h2 id="WebView">Chromium WebView</h2> 248 249<div style="float:right;margin:1em 2em 1em 2em;"> 250 <img src="/images/kk-chromium-icon.png" alt="" height="160" style="margin-bottom:0em;"> 251</div> 252 253<p>The initial release for Android 5.0 includes a version of Chromium for {@link android.webkit.WebView} based on the Chromium M37 release, adding support for <strong>WebRTC</strong>, <strong>WebAudio</strong>, and <strong>WebGL</strong>. </p> 254 255<p>Although WebView has been based on Chromium since Android 4.4, the Chromium layer is now updatable from Google Play.</p> 256 257<p>As new versions of Chromium become available, users can update from Google Play to ensure they get the latest enhancements and bug fixes for WebView, providing the latest web APIs and bug fixes for apps using WebView on Android 5.0 and higher.</p> 258 259 260 261<h2 id="Accessibility">Accessibility & Input</h2> 262 263<p>New accessibility APIs can retrieve detailed information about the properties of windows on the screen that sighted users can interact with and define standard or customized input actions for UI elements.</p> 264 265<p>New Input method editor (IME) APIs enable faster switching to other IMEs directly from the input method.</p> 266 267 268 269<h2 id="Battery">Tools for building battery-efficient apps</h2> 270 271<p>New <strong>job scheduling</strong> APIs allow you optimize battery life by deferring jobs for the system to run at a later time or under specified conditions, such as when the device is charging or connected to Wi-Fi.</p> 272 273<p>A new <code>dumpsys batterystats</code> command generates <strong>battery usage statistics</strong> that you can use to understand system-wide power use and understand the impact of your app on the device battery. You can look at a history of power events, approximate power use per UID and system component, and more.</p> 274 275<img src="{@docRoot}images/versions/battery_historian.png" srcset="{@docRoot}images/versions/battery_historian@2x.png 2x" alt="" width="760" height="462" /> 276<p class="img-caption">Battery Historian is a new tool to convert the statistics from <code>dumpsys batterystats</code> into a visualization for battery-related debugging. You can find it at <a href="https://github.com/google/battery-historian" 277>https://github.com/google/battery-historian</a>.</p> 278