He lives in New Haven, CT, where he drinks a lot of tea, watches a lot of movies, and eats a lot of delicious food. He likens technology to a catalyst that advances the human race, which is why he is so passionate about it. This applies to all variants of the OS: Android 4. To be clear, Jelly Bean devices will still work. Queru informed in his post that the 4. The post and the changelog for the release reveals that the build number for the 4. There is no information when Google will release this update for other devices running Jelly Bean, but a quick look through the changelog reveals that some device specific changes have been made for the Motorola Xoom including the Wi-Fi version , the Google Nexus S, and both the Google Galaxy Nexus and Samsung Galaxy Nexus.
In addition to other information, Queru reveals in the post that future variants of the Nexus 7 hardware will have a minor change in one of the components — the power management chip. He also states that the current version of Android 4. When a wireless display is connected, users can stream any type of content to the big screen, including photos, games, maps, and more. Apps can take advantage of wireless displays in the same way as they do other external displays and no extra work is needed.
The system manages the network connection and streams your Presentation or other app content to the wireless display as needed. Developers can now mirror their layouts for RTL languages. With native RTL support, you can deliver the same great app experience to all of your users, whether their language uses a script that reads right-to-left or one that reads left-to-right.
When the user switches the system language to a right-to-left script, the system now provides automatic mirroring of app UI layouts and all view widgets, in addition to bidi mirroring of text elements for both reading and character input. Your app can take advantage of RTL layout mirroring in your app with minimal effort. The system then handles the mirroring and display of your UI as appropriate. For precise control over your app UI, Android 4. You can even create custom versions of layout, drawables, and other resources for display when a right-to-left script is in use.
For more control over your UI components and to make them more modular, Android 4. For any Fragment, a new Fragment manager lets you insert other Fragments as child nodes in the View hierarchy. You can use nested Fragments in a variety of ways, but they are especially useful for implementing dynamic and reusable UI components inside of a UI component that is itself dynamic and reusable.
For example, if you use ViewPager to create fragments that swipe left and right, you can now insert fragments into each Fragment of the view pager. To let you take advantage of nested Fragments more broadly in your app, this capability is added to the latest version of the Android Support Library. The system now helps accessibility services distinguish between touch exploration and accessibility gestures while in touch-exploration mode.
When a user touches the screen, the system notifies the service that a generic touch interaction has started. It then tracks the speed of the touch interaction and determines whether it is a touch exploration slow or accessibility gesture fast and notifies the service.
When the touch interaction ends, the system notifies the service. The system provides a new global accessibility option that lets an accessibility service open the Quick Settings menu based on an action by the user. Also added in Android 4. To give accessibility services insight into the meaning of Views for accessibility purposes, the framework provides new APIs for associating a View as the label for another View.
The label for each View is available to accessibility services through AccessibilityNodeInfo. On supported devices, apps can use a new HDR camera scene mode to capture an image using high dynamic range imaging techniques.
Additionally, the framework now provides an API to let apps check whether the camera shutter sound can be disabled. Apps can then let the user disable the sound or choose an alternative sound in place of the standard shutter sound, which is recommended.
Filterscript is a subset of Renderscript that is focused on optimized image processing across a broad range of device chipsets.
Filterscript is ideal for hardware-accelerating simple image-processing and computation operations such as those that might be written for OpenGL ES fragment shaders. Because it places a relaxed set of constraints on hardware, your operations are optimized and accelerated on more types of device chipsets.
Any app targeting API level 17 or higher can make use of Filterscript. Intrinsics are available for blends, blur, color matrix, 3x3 and 5x5 convolve, per-channel lookup table, and converting an Android YUV buffer to RGB. You can now create groups of Renderscript scripts and execute them all with a single call as though they were part of a single script. This allows Renderscript to optimize execution of the scripts in ways that it could not do if the scripts were executed individually.
Renderscript image-processing benchmarks run on different Android platform versions Android 4. If you have a directed acyclic graph of Renderscript operations to run, you can use a builder class to create a script group defining the operations.
At execution time, Renderscript optimizes the run order and the connections between these operations for best performance. When you use Renderscript for computation operations, you apps benefit from ongoing performance and optimization improvements in the Renderscript engine itself, without any impact on your app code or any need for recompilation. As optimization improves, your operations execute faster and on more chipsets, without any work on your part.
The chart at right highlights the performance gain delivered by ongoing Renderscript optimization improvements across successive versions of the Android platform. Renderscript Compute is the first computation platform ported to run directly on a mobile device GPU. It now automatically takes advantage of GPU computation resources whenver possible to improve performance. With GPU integration, even the most complex computations for graphics or image processing can execute with dramatically improved performance.
Any app using Renderscript on a supported device can benefit immediately from this GPU integration, without recompiling. The Nexus 10 tablet is the first device to support this integration. The Android 4. The new options expose features for debugging and profiling your app from any device or emulator.
New developer options give you more ways to profile and debug on a device. In most cases, the new platform technologies and enhancements do not directly affect your apps, so you can benefit from them without any modification. Every Android release includes dozens of security enhancements to protect users.
Here are some of the enhancements in Android 4. These improvements depend on hardware support — devices that offer these low-latency audio features can advertise their support to apps through a hardware feature constant. New AudioManager APIs are provided to query the native audio sample rate and buffer size, for use on devices which claim this feature.
The Dalvik runtime includes enhancements for performance and security across a wider range of architectures:.
Find out more about the Jelly Bean features for users at www. To ensure a consistent framerate, Android 4. This results in a more reactive and uniform touch response.
Tooling can help you get the absolute best performance out of your apps. The data is represented as a group of vertically stacked time series graphs, to help isolate rendering interruptions and other issues.
New APIs for accessibility services let you handle gestures and manage accessibility focus as the user moves through the on-screen elements and navigation buttons using accessibility gestures, accessories, and other input.
The Talkback system and explore-by-touch are redesigned to use accessibility focus for easier use and offer a complete set of APIs for developers. Accessibility services can link their own tutorials into the Accessibility settings, to help users configure and use their services. Apps that use standard View components inherit support for the new accessibility features automatically, without any changes in their code.
Apps that use custom Views can use new accessibility node APIs to indicate the parts of the View that are of interest to accessibility services. Apps can display text or handle text editing in left-to-right or right-to-left scripts. Apps can make use of new Arabic and Hebrew locales and associated fonts.
The platform now supports user-installable keyboard maps , such as for additional international keyboards and special layout types. By default, Android 4. When users connect a keyboard, they can go to the Settings app and select one or more keymaps that they want to use for that keyboard.
When typing, users can switch between keymaps using a shortcut ctrl-space. You can create an app to publish additional keymaps to the system. The APK would include the keyboard layout resources in it, based on standard Android keymap format.
Developers can create custom notification styles like those shown in the examples above to display rich content and actions. Notifications have long been a unique and popular feature on Android. Apps can now display larger, richer notifications to users that can be expanded and collapsed with a pinch or swipe. Notifications support new types of content , including photos, have configurable priority, and can even include multiple actions.
Through an improved notification builder , apps can create notifications that use a larger area, up to dp in height. Three templated notification styles are available:. In addition to the templated styles, you can create your own notification styles using any remote View. Apps can add up to three actions to a notification, which are displayed below the notification content. The actions let the users respond directly to the information in the notification in alternative ways.
With expandable notifications, apps can give more information to the user, effortlessly and on demand. Users remain in control and can long-press any notification to get information about the sender and optionally disable further notifications from the app. App Widgets can resize automatically to fit the home screen and load different content as their sizes change.
New App Widget APIs let you take advantage of this to optimize your app widget content as the size of widgets changes. Full path to article: Android Help » Android » Android 4.
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