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					Android 4.0 Platform Highlights

Welcome to Android 4.0!

Android 4.0 delivers a refined, unified UI for phones and tablets and introduces innovative features for users
and developers. This document provides a glimpse of the many new features and technologies that make
Android 4.0 simple, beautiful, and beyond smart.

      Android 4.0 for Users
      Android 4.0 for Developers


Android 4.0 for Users




Simple, beautiful, beyond smart

Android 4.0 builds on the things people love most about Android — easy multitasking, rich notifications,
customizable home screens, resizable widgets, and deep interactivity — and adds powerful new ways of
communicating and sharing.

Refined, evolved UI

Focused on bringing the power of Android to the surface, Android 4.0 makes common actions more visible
and lets users navigate with simple, intuitive gestures. Refined animations and feedback throughout the system
make interactions engaging and interesting. An entirely new typeface optimized for high-resolution screens
improves readability and brings a polished, modern feel to the user interface.

Virtual buttons in the System Bar let users navigate instantly to Back, Home, and Recent Apps. The System
Bar and virtual buttons are present across all apps, but can be dimmed by applications for full-screen viewing.
Users can access each application's contextual options in the Action Bar, displayed at the top (and sometimes
also at the bottom) of the screen.
Multitasking is a key strength of Android and it's made even easier and more visual on Android 4.0. The
Recent Apps button lets users jump instantly from one task to another using the list in the System Bar. The list
pops up to show thumbnail images of apps used recently — tapping a thumbnail switches to the app.




The Recent Apps list makes multitasking simple.




Jump to the camera or see notifications without unlocking.




For incoming calls, you can respond instantly by text.
Rich and interactive notifications let users keep in constant touch with incoming messages, play music tracks,
see real-time updates from apps, and much more. On smaller-screen devices, notifications appear at the top of
the screen, while on larger-screen devices they appear in the System Bar.




The All Apps launcher (left) and resizable widgets (right) give you apps and rich content from the home screen.

Home screen folders and favorites tray

New home screen folders offer a new way for users to group their apps and shortcuts logically, just by dragging
one onto another. Also, in All Apps launcher, users can now simply drag an app to get information about it or
immediately uninstall it, or disable a pre-installed app.

On smaller-screen devices, the home screen now includes a customizable favorites tray visible from all home
screens. Users can drag apps, shortcuts, folders, and other priority items in or out of the favorites tray for instant
access from any home screen.

Resizable widgets

Home screens in Android 4.0 are designed to be content-rich and customizable. Users can do much more than
add shortcuts — they can embed live application content directly through interactive widgets. Widgets let users
check email, flip through a calendar, play music, check social streams, and more — right from the home screen,
without having to launch apps. Widgets are resizable, so users can expand them to show more content or shrink
them to save space.

New lock screen actions

The lock screens now let users do more without unlocking. From the slide lock screen, users can jump directly
to the camera for a picture or pull down the notifications window to check for messages. When listening to
music, users can even manage music tracks and see album art.

Quick responses for incoming calls

When an incoming call arrives, users can now quickly respond by text message, without needing to pick up the
call or unlock the device. On the incoming call screen, users simply slide a control to see a list of text responses
and then tap to send and end the call. Users can add their own responses and manage the list from the Settings
app.

Swipe to dismiss notifications, tasks, and browser tabs
Android 4.0 makes managing notifications, recent apps, and browser tabs even easier. Users can now dismiss
individual notifications, apps from the Recent Apps list, and browser tabs with a simple swipe of a finger.




A spell-checker lets you find errors and fix them faster.




A powerful voice input engine lets you dictate continously.

Improved text input and spell-checking

The soft keyboard in Android 4.0 makes text input even faster and more accurate. Error correction and word
suggestion are improved through a new set of default dictionaries and more accurate heuristics for handling
cases such as double-typed characters, skipped letters, and omitted spaces. Word suggestion is also improved
and the suggestion strip is simplified to show only three words at a time.

To fix misspelled words more easily, Android 4.0 adds a spell-checker that locates and underlines errors and
suggests replacement words. With one tap, users can choose from multiple spelling suggestions, delete a word,
or add it to the dictionary. Users can even tap to see replacement suggestions for words that are spelled
correctly. For specialized features or additional languages, users can now download and install third-party
dictionaries, spell-checkers, and other text services.

Powerful voice input engine

Android 4.0 introduces a powerful new voice input engine that offers a continuous "open microphone"
experience and streaming voice recognition. The new voice input engine lets users dictate the text they want, for
as long as they want, using the language they want. Users can speak continously for a prolonged time, even
pausing for intervals if needed, and dictate punctuation to create correct sentences. As the voice input engine
enters text, it underlines possible dictation errors in gray. After dictating, users can tap the underlined words to
quickly replace them from a list of suggestions.
Data usage controls let you monitor total usage by network type and application and then set limits if needed.

Control over network data

Mobile devices can make extensive use of network data for streaming content, synchronizing data, downloading
apps, and more. To meet the needs of users with tiered or metered data plans, Android 4.0 adds new controls
for managing network data usage.

In the Settings app, colorful charts show the total data usage on each network type (mobile or Wi-Fi), as well as
amount of data used by each running application. Based on their data plans, users can optionally set warning
levels or hard limits on data usage or disable mobile data altogether. Users can also manage the background
data used by individual applications as needed.

Designed for accessibility

A variety of new features greatly enhance the accessibility of Android 4.0 for blind or visually impaired users.
Most important is a new explore-by-touch mode that lets users navigate without having to see the screen.
Touching the screen once triggers audible feedback that identifies the UI component below; a second touch in
the same component activates it with a full touch event. The new mode is especially important to support users
on new devices that use virtual buttons in the System Bar, rather than dedicated hardware buttons or trackballs.
Also, standard apps are updated to offer an improved accessibility experience. The Browser supports a script-
based screen reader for reading favorite web content and navigating sites. For improved readability, users can
also increase the default font size used across the system.

The accessibility experience begins at first setup — a simple touch gesture during setup (clockwise square
from upper left) activates all accessibility features and loads a setup tutorial. Once accessibility features are
active, everything visible on the screen can be spoken aloud by the standard screen reader.

Communication and sharing
Contacts and profiles are integrated across apps and social networks, for a consistent, personal experience everywhere
— from incoming calls to emails.

Designed for the way people live, Android 4.0 integrates rich social communication and sharing touchpoints
across the system, making it easy to talk, email, text, and share.

People and profiles

Throughout the system, a user’s social groups, profiles, and contacts are linked together and integrated for easy
accessibility. At the center is a new People app that offers richer profile information, including a large profile
picture, phone numbers, addresses and accounts, status updates, events, and a new button for connecting on
integrated social networks.

The user's own contact information is stored in a new "Me" profile, allowing easier sharing with apps and
people. All of the user's integrated contacts are displayed in an easy to manage list, including controls over
which contacts are shown from any integrated account or social network. Wherever the user navigates across
the system, tapping a profile photo displays Quick Contacts, with large profile pictures, shortcuts to phone
numbers, text messaging, and more.

Unified calendar, visual voicemail

To help organize appointments and events, an updated Calendar app brings together personal, work, school,
and social agendas. With user permission, other applications can contribute events to the calendar and manage
reminders, for an integrated view across multiple calendar providers. The app is redesigned to let users manage
events more easily. Calendars are color-coded and users can swipe left or right to change dates and pinch to
zoom in or out agendas.

In the phone app, a new visual voicemail features integrates incoming messages, voice transcriptions, and audio
files from one or more providers. Third-party applications can integrate with the Phone app to add their own
voice messages, transcriptions, and more to the visual voicemail inbox.
Capture the picture you want, edit, and share instantly.

Rich and versatile camera capabilities

The Camera app includes many new features that let users capture special moments with great photos and
videos. After capturing images, they can edit and share them easily with friemds.

When taking pictures, continuous focus, zero shutter lag exposure, and decreased shot-to-shot speed help
capture clear, precise images. Stabilized image zoom lets users compose photos and video in the way they
want, including while video is recording. For new flexibility and convenience while shooting video, users can
now take snapshots at full video resolution just by tapping the screen as video continues to record.

To make it easier to take great pictures of people, built-in face detection locates faces in the frame and
automatically sets focus. For more control, users can tap to focus anywhere in the preview image.

For capturing larger scenes, the Camera introduces a single-motion panorama mode. In this mode, the user
starts an exposure and then slowly turns the Camera to encompass as wide a perspective as needed. The Camera
assembles the full range of continuous imagery into a single panoramic photo.

After taking a picture or video, users can quickly share it by email, text message, bluetooth, social networks,
and more, just by tapping the thumbnail in the camera controls.




A Photo Gallery widget on the home screen.

Redesigned Gallery app with photo editor

The Gallery app now makes it easier to manage, show, and share photos and videos. For managing collections,
a redesigned album layout shows many more albums and offers larger thumbnails. There are many ways to
sort albums, including by time, location, people, and tags. To help pictures look their best, the Gallery now
includes a powerful photo editor. Users can crop and rotate pictures, set levels, remove red eyes, add effects,
and much more. After retouching, users can select one or multiple pictures or videos to share instantly over
email, text messaging, bluetooth, social networks, or other apps.
An improved Picture Gallery widget lets users look at pictures directly on their home screen. The widget can
display pictures from a selected album, shuffle pictures from all albums, or show a single image. After adding
the widget to the home screen, users can flick through the photo stacks to locate the image they want, then tap
to load it in Gallery.




Live Effects let you change backgrounds and use Silly Faces during video.

Live Effects for transforming video

Live Effects is a collection of graphical transformations that add interest and fun to videos captured in the
Camera app. For example, users can change the background behind them to any stock or custom image, for
just the right setting when shooting videeo. Also available for video is Silly Faces, a set of morphing effects that
use state-of-the-art face recognition and GPU filters to transform facial features. For example, you can use
effects such as small eyes, big mouth, big nose, face squeeze, and more. Outside of the Camera app, Live
Effects is available during video chat in the Google Talk app.




Snapping a screenshot.

Sharing with screenshots

Users can now share what's on their screens more easily by taking screenshots. Hardware buttons let them snap
a screenshot and store it locally. Afterward, they can view, edit, and share the screen shot in Gallery or a
similar app.

Cloud-connected experience
The Browser tabs menu (left) lets you quickly switch browser tabs. The options menu (right) gives you new ways to
manage your browsing experience.




Benchmark comparisons of Android Browser.

Android has always been cloud-connected, letting users browse the web and sync photos, apps, games, email,
and contacts — wherever they are and across all of their devices. Android 4.0 adds new browsing and email
capabilities to let users take even more with them and keep communication organized.

Powerful web browsing

The Android Browser offers an experience that’s as rich and convenient as a desktop browser. It lets users
instantly sync and manage Google Chrome bookmarks from all of their accounts, jump to their favorite
content faster, and even save it for reading later in case there's no network available.

To get the most out of web content, users can now request full desktop versions of web sites, rather than their
mobile versions. Users can set their preference for web sites separately for each browser tab. For longer
content, users can save a copy for offline reading. To find and open saved pages, users can browse a visual list
that’s included with browser bookmarks and history. For better readability and accessibility, users can increase
the browser’s zoom levels and override the system default text sizes.

Across all types of content, the Android Browser offers dramatically improved page rendering performance
through updated versions of the WebKit core and the V8 Crankshaft compilation engine for JavaScript. In
benchmarks run on a Nexus S device, the Android 4.0 browser showed an improvement of nearly 220% over
the Android 2.3 browser in the V8 Benchmark Suite and more than 35% in the SunSpider 9.1 JavaScript
Benchmark. When run on a Galaxy Nexus device, the Android 4.0 browser showed improvement of nearly
550% in the V8 benchmark and nearly 70% in the SunSpider benchmark.

Improved email

In Android 4.0, email is easier to send, read, and manage. For composing email, improved auto-completion of
recipients helps with finding and adding frequent contacts more quickly. For easier input of frequent text, users
can now create quick responses and store them in the app, then enter them from a convenient menu when
composing. When replying to a message, users can now toggle the message to Reply All and Forward without
changing screens.

For easier browsing across accounts and labels, the app adds an integrated menu of accounts and recent labels.
To help users locate and organize IMAP and Exchange email, the Email app now supports nested mail
subfolders, each with synchronization rules. Users can also search across folders on the server, for faster
results.

For enterprises, the Email app supports EAS v14. It supports EAS certificate authentication, provides ABQ
strings for device type and mode, and allows automatic sync to be disabled while roaming. Administrators can
also limit attachment size or disable attachments.

For keeping track of incoming email more easily, a resizable Email widget lets users flick through recent email
right from the home screen, then jump into the Email app to compose or reply.




Android Beam lets users share what they are using with a single tap.

Innovation

Android is continously driving innovation forward, pushing the boundaries of communication and sharing with
new capabilities and interactions.

Android Beam for NFC-based sharing

Android Beam is an innovative, convenient feature for sharing across two NFC-enabled devices, It lets people
instantly exchange favorite apps, contacts, music, videos — almost anything. It’s incredibly simple and
convenient to use — there’s no menu to open, application to launch, or pairing needed. Just touch one Android-
powered phone to another, then tap to send.
For sharing apps, Android Beam pushes a link to the app's details page in Android Market. On the other device,
the Market app launches and loads the details page, for easy downloading of the app. Individual apps can build
on Android Beam to add other types of interactions, such as passing game scores, initiating a multiplayer game
or chat, and more.




Face recognition lets you unlock your phone with your face.

Face Unlock

Android 4.0 introduces a completely new approach to securing a device, making each person's device even
more personal — Face Unlock is a new screen-lock option that lets users unlock their devices with their faces. It
takes advantage of the device front-facing camera and state-of-the-art facial recognition technology to register a
face during setup and then to recognize it again when unlocking the device. Users just hold their devices in front
of their faces to unlock, or use a backup PIN or pattern.

Wi-Fi Direct and Bluetooth HDP

Support for Wi-Fi Direct lets users connect directly to nearby peer devices over Wi-Fi, for more reliable,
higher-speed communication. No internet connection or tethering is needed. Through third-party apps, users can
connect to compatible devices to take advantage of new features such as instant sharing of files, photos, or other
media; streaming video or audio from another device; or connecting to compatible printers or other devices.

Android 4.0 also introduces built-in support for connecting to Bluetooth Health Device Profile (HDP) devices.
With support from third-party apps, users can connect to wireless medical devices and sensors in hospitals,
fitness centers, homes, and elsewhere. In addition, for connecting to higher quality Bluetooth audio devices,
Android 4.0 adds support for Bluetooth Hands Free Profile (HFP) 1.6.

New Developer Features
Unified UI framework for phones, tablets, and more

Android 4.0 brings a unified UI framework that lets developers create elegant, innovative apps for phones,
tablets, and more. It includes all of the familiar Android 3.x interface elements and APIs — fragments, content
loaders, Action Bar, rich notifications, resizable home screen widgets, and more — as well as new elements and
APIs.
For developers, the unified UI framework in Android 4.0 means new UI tools, consistent design practices,
simplified code and resources, and streamlined development across the range of Android-powered devices.

Key Android 3.x developer features,
now for phones too

Core UI

      Fragments and content loaders
      Resizeable home screen widgets
      Rich notifications
      Multi-selection, drag-drop, clipboard
      Improved screen-support API
      Hardware-accelerated 2D graphics

Graphics and animation

      Property-based animation
      Renderscript 3D graphics

Media and connectivity

      HTTP Live streaming
      Bluetooth A2DP and HSP devices
      Support for RTP
      MTP/PTP file transfer
      DRM framework
      Input from keyboard, mouse, gamepad, joystick

Enterprise

      Full device encryption
      DPM policies for encrypted storage and passwords

Communication and sharing

Android 4.0 extends social and sharing features to any application on the device. Applications can integrate
contacts, profile data, and calendar events from any of the user’s activities or social networks.

Social API

A shared social provider and API provide a new unified store for contacts, profile data, status updates, and
photos. Any app or social network with user permission can contribute raw contacts and make them accessible
to other apps and networks. Applications with user permission can also read profile data from the provider and
display it in their applications.

The social API lets applications store standard contact data as well as new types of content for any given
contact, including large profile photos and recent activity feedback. Recent activity feedback is a standard way
for applications to “tag” a contact with common activity, such as when the user calls the contact or sends an
email or SMS message. The social provider uses the recent activity feedback as a new signal in ranking, such as
for name auto-complete, to keep the most relevant contacts ranked closest to the top.
Applications can also let users set up a social connection to a contact from the People app. When the user
touches Add Connection in a contact, the app sends a public intent that other apps can handle, displaying any UI
needed to create the social connection.

Building on the social API, developers can add powerful new interactions that span multiple social networks
and contacts sources.

Calendar API

A shared calendar content provider and framework API make it easier for developers to add calendar services to
their apps.

With user permission, any application can add events to the shared database and manage dates, attendees, alerts,
and reminders. Applications can also read entries from the database, including events contributed by other
applications, and handle the display of event alerts and reminders. Using the calendar provider, applications can
take advantage of event data sourced from a variety of apps and protocols, to offer innovative ways of viewing
and managing a user’s events. Apps can also use calendar data to improve the relevance of their other content.

For lighter-weight access to calendar services, the Calendar app defines a set of public Intents for creating,
viewing, and editing events. Rather than needing to implement a calendar UI and integrate directly with the
calendar provider, applications can simply broadcast calendar Intents. When the Calendar app receives the
Intents, it launches the appropriate UI and stores any event data entered. Using calendar Intents, for example,
apps can let users add events directly from lists, dialogs, or home screen widgets, such as for making restaurant
reservations or booking time with friends.

Visual voicemail API

A shared Voicemail provider and API allow developers to build applications that contribute to a unified
voicemail store. Voicemails are displayed and played in the call log tab of the platform’s Phone app.

Android Beam

Android Beam is an NFC-based feature that lets users instantly share information about the apps they are using,
just by touching two NFC-enabled phones together. When the devices are in range — within a few centimeters
— the system sets up an NFC connection and displays a sharing UI. To share whatever they are viewing with
the other device, users just touch the screen.

For developers, Android Beam is a new way of triggering almost any type of proximity-based interaction. For
example, it can let users instantly exchange contacts, set up multiplayer gaming, join a chat or video call, share
a photo or video, and more. The system provides the low-level NFC support and the sharing UI, while the
foreground app provides lightweight data to transfer to the other device. Developers have complete control over
the data that is shared and how it is handled, so almost any interaction is possible. For larger payloads,
developers can even use Android Beam to initiate a connection and transfer the data over Bluetooth, without the
need for user-visible pairing.

Even if developers do not add custom interactions based on Android Beam they can still benefit from it being
deeply integrated into Android. By default the system shares the app’s Android Market URL, so it’s easy for the
user to download or purchase the app right away.

Modular sharing widget
The UI framework includes a new widget, ShareActionProvider, that lets developers quickly embed standard
share functionality and UI in the Action Bar of their applications. Developers simply add ShareActionProvider
to the menu and set an intent that describes the desired sharing action. The system handles the rest, building up
the list of applications that can handle the share intent and dispatching the intent when the user chooses from the
menu.

New media capabilities

Low-level streaming multimedia

Android 4.0 provides a direct, efficient path for low-level streaming multimedia. The new path is ideal for
applications that need to maintain complete control over media data before passing it to the platform for
presentation. For example, media applications can now retrieve data from any source, apply proprietary
encryption/decryption, and then send the data to the platform for display.

Applications can now send processed data to the platform as a multiplexed stream of audio/video content in
MPEG-2 transport stream format. The platform de-muxes, decodes, and renders the content. The audio track is
rendered to the active audio device, while the video track is rendered to either a Surface or a SurfaceTexture.
When rendering to a SurfaceTexture, the application can apply subsequent graphics effects to each frame using
OpenGL.

To support this low-level streaming, the platform introduces a new native API based on Khronos OpenMAX
AL 1.0.1. The API is implemented on the same underlying services as the platform’s existing OpenSL ES API,
so developers can make use of both APIs together if needed. Tools support for low-level streaming multimedia
will be available in an upcoming release of the Android NDK.

New camera capabilities

Developers can take advantage of a variety of new camera features in Android 4.0. ZSL exposure, continuous
focus, and image zoom let apps capture better still and video images, including during video capture. Apps can
even capture full-resolution snapshots while shooting video. Apps can now set custom metering regions in a
camera preview, then manage white balance and exposure dynamically for those regions. For easier focusing
and image processing, a face-detection service identifies and tracks faces in a preview and returns their screen
coordinates.

Media effects for transforming images and video

A set of high-performance transformation filters let developers apply rich effects to any image passed as an
OpenGL ES 2.0 texture. Developers can adjust color levels and brightness, change backgrounds, sharpen, crop,
rotate, add lens distortion, and apply other effects. The transformations are processed by the GPU, so they are
fast enough for processing image frames loaded from disk, camera, or video stream.

Audio remote controls

Android 4.0 adds a new audio remote control API that lets media applications integrate with playback controls
that are displayed in a remote view. Media applications can integrate with a remote music playback control
that’s built into in the platform’s lock screen, allowing users to control song selection and playback without
having to unlock and navigate to the music app.
Using the audio remote control API, any music or media app can register to receive media button events from
the remote control and then manage play state accordingly. The application can also supply metadata to the
remote control, such as album art or image, play state, track number and description, duration, genre, and more.

New media codecs and containers

Android 4.0 adds support for additional media types and containers to give developers access to the formats
they need. For high-quality compressed images, the media framework adds support for WebP content. For
video, the framework now supports streaming VP8 content. For streaming multimedia, the framework supports
HTTP Live streaming protocol version 3 and encoding of ADTS-contained AAC content. Additionally,
developers can now use Matroska containers for Vorbis and VP8 content.

New types of connectivity

Wi-Fi Direct

Developers can use a framework API to discover and connect directly to nearby devices over a high-
performance, secure Wi-Fi Direct connection. No internet connection or hotspot is needed.

Wi-Fi Direct opens new opportunities for developers to add innovative features to their applications.
Applications can use Wi-Fi Direct to share files, photos, or other media between devices or between a desktop
computer and an Android-powered device. Applications could also use Wi-Fi Direct to stream media content
from a peer device such as a digital television or audio player, connect a group of users for gaming, print files,
and more.

Bluetooth Health Device Profile (HDP)

Developers can now build powerful medical applications that use Bluetooth to communicate with wireless
devices and sensors in hospitals, fitness centers, homes, and elsewhere. Applications can collect and manage
data from HDP source devices and transmit it to backend medical applications such as records systems, data
analysis services, and others.

Using a framework API, applications can use Bluetooth to discover nearby devices, establish reliable or
streaming data channels, and manage data transmission. Applications can supply any IEEE 11073 Manager to
retrieve and interpret health data from Continua-certified devices such as heart-rate monitors, blood meters,
thermometers, and scales.

New UI components and capabilities

Layout enhancements

A new layout, GridLayout, improves the performance of Android applications by supporting flatter view
hierarchies that are faster to layout and render. Because hierarchies are flatter, developers can also manage
alignments between components that are visually related to each other even when they are not logically related,
for precise control over application UI. GridLayout is also specifically designed to be configured by drag-and-
drop design tools such as the ADT Plug-in for Eclipse.

OpenGL ES texture views

A new TextureView object lets developers directly integrate OpenGL ES textures as rendering targets in a UI
hierarchy. The object lets developers display and manipulate OpenGL ES rendering just as they would a normal
view object in the hierarchy, including moving, transforming, and animating the view as needed. The
TextureView object makes it easy for developers to embed camera preview, decoded video, OpenGL game
scenes, and more. TextureView can be viewed as a more powerful version of the existing SurfaceView object,
since it offers the same benefits of access to a GL rendering surface, with the added advantage of having that
surface participate fully in the normal view hierarchy.

Hardware-accelerated 2D drawing

All Android-powered devices running Android 4.0 are required to support hardware-accelerated 2D drawing.
Developers can take advantage of this to add great UI effects while maintaining optimal performance on high-
resolution screens, even on phones. For example, developers can rely on accelerated scaling, rotation, and other
2D operations, as well as accelerated UI components such as TextureView and compositing modes such as
filtering, blending, and opacity.

New input types and text services

Stylus input, button support, hover events

Android 4.0 includes full support for stylus input events, including tilt and distance axes, pressure, and related
motion event properties. To help applications distinguish motion events from different sources, the platform
adds distinct tool types for stylus, finger, mouse, and eraser. For improved input from multi-button pointing
devices, the platform now provides distinct primary, secondary, and tertiary buttons, as well as back and
forward buttons. Hover-enter and hover-exit events are also added, for improved navigation and accessibility.
Developers can build on these new input features to add powerful interactions to their apps, such as precise
drawing and gesturing, handwriting and shape recognition, improved mouse input, and others.

Text services API for integrating spelling checkers

Android 4.0 lets applications query available text services such as dictionaries and spell checkers for word
suggestions, corrections, and similar data. The text services are external to the active IME, so developers can
create and distribute dictionaries and suggestion engines that plug into the platform. When an application
receives results from a text service — for example, word suggestions — it can display them in a dedicated
suggestion popup window directly inside the text view, rather than relying on the IME to display them.

Enhanced accessibility APIs

Android 4.0 adds new accessibility features and an enhanced API to let developers improve the user experience
in their apps, especially on devices that don’t have hardware buttons. For accessibility services such as screen
readers in particular, the platform offers new APIs to query window content, for easier navigation, better
feedback, and richer user interfaces.

Accessibility API

To let applications manage interactions more effectively when accessibility features are enabled, the platform
adds accessibility events for explore-by-touch mode, scrolling, and text selection. For these and other events,
the platform can attach a new object called an accessibility record that provides extra information about the
event context.

Using the accessibility record and related APIs, applications can now access the view hierarchy associated with
an event. Applications can query for key properties such as parent and child nodes, available states, supported
actions, screen position, and more. Applications can also request changes to certain properties to help manage
focus and selected state. For example, an accessibility service could use these new capabilities to add
convenient features such as screen-search by text.

Text-to-speech API

A new framework API lets developers write text-to-speech engines and make them available to any app
requesting TTS capabilities.

Efficient network usage

In Android 4.0, users can see how much network data their running apps are using. They can also set limits on
data usage by network type and disable background data usage for specific applications. In this context,
developers need to design their apps to run efficiently and follow best practices for checking the network
connection. Android 4.0 provides network APIs to let applications meet those goals.

As users move between networks or set limits on network data, the platform lets applications query for
connection type and availability. Developers can use this information to dynamically manage network requests
to ensure the best experience for users. Developers can also build custom network and data-usage options into
their apps, then expose them to users directly from Settings by means of a new system Intent.

Security for apps and content

Secure management of credentials

Android 4.0 makes it easier for applications to manage authentication and secure sessions. A new keychain API
and underlying encrypted storage let applications store and retrieve private keys and their corresponding
certificate chains. Any application can use the keychain API to install and store user certificates and CAs
securely.

Address Space Layout Randomization

Android 4.0 now provides address space layout randomization (ASLR) to help protect system and third party
applications from exploitation due to memory-management issues.

Enhancements for Enterprise

VPN client API

Developers can now build or extend their own VPN solutions on the platform using a new VPN API and
underlying secure credential storage. With user permission, applications can configure addresses and routing
rules, process outgoing and incoming packets, and establish secure tunnels to a remote server. Enterprises can
also take advantage of a standard VPN client built into the platform that provides access to L2TP and IPSec
protocols.

Device policy management for camera

The platform adds a new policy control for administrators who manage devices using an installed Device Policy
Manager. Administrators can now remotely disable the camera on a managed device for users working in
sensitive environments.

				
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posted:12/18/2011
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Description: Android 4.0 system named Ice Cream Sandwich is Google released a new operating system. Android4.0 with ten key new features. Integrated TV and Google Chrome OS, smart parking, speed has been further improved. At 10:00 on October 19th, 2011, Google is teaming up with Samsung press conference held in Hong Kong, China, announced the Android 4.0 system information.