Android 4.1 jelly bean operativni sistem
Your app can display content by default in the main Activity until a preferred Presentation display is attached, at which time it can automatically switch to Presentation content on the preferred display. For apps that handle protected or encrypted content, the display API now reports the secure video capabilities of attached displays. Your app query a display to find out if it offers a secure video output or provides protected graphics buffers and then choose the appropriate content stream or decoding to make the content viewable.
For additional security on SurfaceView objects, your app can set a secure flag to indicate that the contents should never appear in screenshots or on a non-secure display output, even when mirrored. 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.
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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.
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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.
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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. For example, a widget could display larger, richer graphics or additional functionality or options. Developers can still maintain control over maximum and minimum sizes and can update other widget options whenever needed.
You can also supply separate landscape and portrait layouts for your widgets, which the system inflates as appropriate when the screen orientation changes. App widgets can now be displayed in third party launchers and other host apps through a new bind Intent AppWidgetManager. At run time, as Activities are launched, the system extracts the Up navigation tree from the manifest file and automatically creates the Up affordance navigation in the action bar. Developers who declare Up navigation in the manifest no longer need to manage navigation by callback at run time, although they can also do so if needed.
Also available is a new TaskStackBuilder class that lets you quickly put together a synthetic task stack to start immediately or to use when an Activity is launched from a PendingIntent. Creating a synthetic task stack is especially useful when users launch Activities from remote views, such as from Home screen widgets and notifications, because it lets the developer provide a managed, consistent experience on Back navigation.
You can use a new helper class, ActivityOptions , to create and control the animation displayed when you launch your Activities. Through the helper class, you can specify custom animation resources to be used when the activity is launched, or request new zoom animations that start from any rectangle you specify on screen and that optionally include a thumbnail bitmap. New system UI flags in View let you to cleanly transition from a normal application UI with action bar, navigation bar, and system bar visible , to "lights out mode" with status bar and action bar hidden and navigation bar dimmed or "full screen mode" with status bar, action bar, and navigation bar all hidden.
GridLayout lets you structure the content of your remote views and manage child views alignments with a shallower UI hierarchy. ViewStub is an invisible, zero-sized View that can be used to lazily inflate layout resources at runtime. From the preview, users can directly load the Live Wallpaper. With Android 4. Apps can store and retrieve contact photos at that size or use any other size needed. The maximum photo size supported on specific devices may vary, so apps should query the built-in contacts provider at run time to obtain the max size for the current device.
Apps can register to be notified when any new input devices are attached, by USB, Bluetooth, or any other connection type. They can use this information to change state or capabilities as needed. For example, a game could receive notification that a new keyboard or joystick is attached, indicating the presence of a new player. Apps can query the device manager to enumerate all of the input devices currently attached and learn about the capabilities of each. Among other capabilities, apps can now make use of any vibrator service associated with an attached input device, such as for Rumble Pak controllers.
Extending vsync across the Android framework leads to a more consistent framerate and a smooth, steady UI. So that apps also benefit, Android 4.
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This lets them optimize operations on the UI thread and provides a stable timebase for synchronization. The animation framework now uses vsync timing to automatically handle synchronization across animators. For specialized uses, apps can access vsync timing through APIs exposed by a new Choreographer class.
Apps can request invalidation on the next vsync frame — a good way to schedule animation when the app is not using the animation framework. For more advanced uses, apps can post a callback that the Choreographer class will run on the next frame. The animation framework now lets you define start and end actions to take when running ViewPropertyAnimator animations, to help synchronize them with other animations or actions in the application.
The action can run any runnable object. For example, the runnable might specify another animation to start when the previous one finishes. You can also now specify that a ViewPropertyAnimator use a layer during the course of its animation. Previously, it was a best practice to animate complicated views by setting up a layer prior to starting an animation and then handling an onAnimationEnd event to remove the layer when the animation finishes.
Now, the withLayer method on ViewPropertyAnimator simplifies this process with a single method call. A new transition type in LayoutTransition enables you to automate animations in response to all layout changes in a ViewGroup. When the user triggers a transfer, Android Beam hands over from NFC to Bluetooth, making it really easy to manage the transfer of a file from one device to another. Developers can take advantage of Wi-Fi network service discovery to build cross-platform or multiplayer games and application experiences. Using the service discovery API, apps can create and register any kind of service, for any other NSD-enabled device to discover.
The service is advertised by multicast across the network using a human-readable string identifier, which lets user more easily identify the type of service. Consumer devices can use the API to scan and discover services available from devices connected to the local Wi-Fi network. After discovery, apps can use the API to resolve the service to an IP address and port through which it can establish a socket connection.
You can take advantage of this API to build new features into your apps. For example, you could let users connect to a webcam, a printer, or an app on another mobile device that supports Wi-Fi peer-to-peer connections. Wi-Fi P2P is an ideal way to share media, photos, files and other types of data and sessions, even where there is no cell network or Wi-Fi available. Pre-associated service discovery lets your apps get more useful information from nearby devices about the services they support, before they attempt to connect. Apps can initiate discovery for a specific service and filter the list of discovered devices to those that actually support the target service or application.
On the other hand, your app can advertise the service it provides to other devices, which can discover it and then negotiate a connection. This greatly simplifies discovery and pairing for users and lets apps take advantage of Wi-Fi P2P more effectively. With Wi-Fi P2P service discovery, you can create apps and multiplayer games that can share photos, videos, gameplay, scores, or almost anything else — all without requiring any Internet or mobile network.
Your users can connect using only a direct p2p connection, which avoids using mobile bandwidth. Apps can query whether the current network is metered before beginning a large download that might otherwise be relatively expensive to the user. Through the API, you can now get a clear picture of which networks are sensitive to data usage and manage your network activity accordingly.
Apps can query the system to discover what low-level media codecs are available on the device and then and use them in the ways they need. For example, you can now create multiple instances of a media codec, queue input buffers, and receive output buffers in return. In addition, the media codec framework supports protected content. Apps can query for an available codec that is able to play protected content with a DRM solution available on the device.
USB audio output support allows hardware vendors to build hardware such as audio docks that interface with Android devices. Android now lets you trigger audio recording based on the completion of an audio playback track. This is useful for situations such as playing back a tone to cue your users to begin speaking to record their voices. Multichannel audio lets you deliver rich media experiences to users for applications such as games, music apps, and video players.
For devices that do not have the supported hardware, Android automatically downmixes the audio to the number of channels that are supported by the device usually stereo. Developers can apply preprocessing effects to audio being recorded, such as to apply noise suppression for improving speech recording quality, echo cancellation for acoustic echo, and auto gain control for audio with inconsistent volume levels. Apps that require high quality and clean audio recording will benefit from these preprocessors. MediaPlayer supports chaining audio streams together to play audio files without pauses.
This is useful for apps that require seamless transitions between audio files such as music players to play albums with continuous tracks or games.
Dosadašnje inačice sustava Androida – Wikipedija
Support is built-in for wired headsets and a2dp bluetooth headsets and speakers, and you can add your own routing options within your own app. You can now sample textures in your Renderscript compute scripts, and new pragmas are available to define the floating point precision required by your scripts. You can now debug your Renderscript compute scripts on xbased emulator and hardware devices. You can also define multiple root-style kernels in a single Renderscript source file. To extend the capabilities of Android even further, several new services for Android are available.
Google Cloud Messaging GCM is a service that lets developers send short message data to their users on Android devices, without needing a proprietary sync solution. GCM handles all the details of queuing messages and delivering them efficiently to the targeted Android devices. It supports message multicasting and can reach up to connected devices simultaneously with a single request.
It also supports message payloads , which means that in addition to sending tickle messages to an app on the device, developers can send up to 4K of data. Google Cloud Messaging is completely free for all developers and sign-up is easy. See the Google Cloud Messaging page for registration, downloads, and documentation.
Starting with Android 4. Smart app updates is a new feature of Google Play that introduces a better way of delivering app updates to devices.
Dosadašnje inačice sustava Androida
When developers publish an update, Google Play now delivers only the bits that have changed to devices, rather than the entire APK. Google Play services is automatically provisioned to end user devices by Google Play, so all you need is a thin client library in your apps. Do you have a GitHub project? Now you can sync your releases automatically with SourceForge and take advantage of both platforms.
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