Android 4.2 Jelly Bean (API 17) was released on November 13, 2012. It was based on Linux kernel 3.4.0, and debuted on Google’s Nexus 4 and Nexus 10.
Android 4.2 expands on the execution changes effectively included into Jelly Bean — vsync timing, triple buffering, diminished touch inertness, and CPU input help — and includes new improvements that make Android much quicker.
Upgrades in the equipment quickened 2D renderer make regular livelinesss, for example, looking over and swiping smoother and speedier. Specifically, drawing is upgraded for layers, cutting and certain shapes .
An assortment of WebView rendering enhancements make looking of site pages smoother and free from jitter and slacks. Android’s Renderscript Compute is the primary calculation stage ported to run specifically on a cell phone GPU. It naturally exploits GPU calculation assets at whatever point conceivable, significantly enhancing execution for designs and picture handling. Any application utilizing Renderscript on an upheld gadget can profit instantly from this GPU incorporation without recompiling.
Android 4.2 refines the Jelly Bean client encounter and brings well-known Android UI examples, for example, status bar, framework bar, and warnings window to all tablets. All screen sizes presently highlight the status bar to finish everything, with pull-down access to warnings and another Quick Settings menu. The well-known framework bar shows up on the base, with catches effectively available from either hand. The Application Tray is additionally accessible on all screen sizes.
In Android 4.2, users can put application gadgets specifically on their lock screens, for moment access to most loved application content without unlocking. Clients can include upwards of five bolt screen gadgets, browsing gadgets gave by introduced applications. The lock screen shows every gadget in its own board, giving clients a chance to swipe left and ideal to see diverse boards and their gadgets.
Like all application gadgets, lock screen gadgets can show any sort of substance and they can acknowledge coordinate client collaboration. They can be altogether independent, for example, a gadget that offers controls to play music, or they can give clients a chance to bounce straight to an Activity in your application, subsequent to opening en route as required.
Another biggest include to 4.2 was the new “Fast Settings” board. Android 3.0 brought an approach to rapidly change control settings to tablets, and 4.2 at last conveyed that capacity to phones. Another icon was added to the upper right corner of the notice board that would switch between the typical list of warnings and the new quick settings screen. Quick Settings offered speedier access to screen shine, arrange associations, and battery and information utilization without digging through the full settings screen. The best level settings button in Android 4.1 was evacuated, and a square was added to the Quick Settings screen for it.
Android 4.2 presents another camera equipment interface and pipeline for enhanced execution. On bolstered gadgets, applications can utilize another HDR camera scene mode to catch a picture utilizing high powerful range imaging systems.
Moreover, the system currently gives an API to let applications check whether the camera shade sound can be incapacitated. Applications would then be able to give the client a chance to impair the sound or pick an elective sound instead of the standard shade sound, which is prescribed.
The clock application was totally patched up, going from a simple two-screen wake up timer to a world clock, caution, clock, and stopwatch. The clock application configuration resembled nothing Google presented previously, with a ultra-insignificant tasteful and red features. It was by all accounts an analysis for Google. Indeed, even a few forms later, this plan language appeared to be restricted just to this application.
The clock’s time picker was especially very much outlined. It demonstrated a basic number cushion, and it would wisely handicap numbers that would bring about an invalid time. It was additionally difficult to set a caution time without certainly choosing AM or PM, everlastingly taking care of the issue of unintentionally setting an alert for 9pm rather than 9am.
Android 4.2 likewise included another console with swiping capacities. As opposed to simply tapping every individual letter, users could now keep a finger on the screen the entire time and simply slide from letter to letter to type.
Android 4.2 Jelly Bean includes following features :
- Lock screen upgrades, including gadget support (evacuated again in 2014)and the capacity to swipe directly to camera
- Warning force controls (“Quick Settings”)
- “Wander off in fantasy land” screensavers, indicating data when sit out of gear or docked (later renamed to “screen saver” following the dispatch of the disconnected Google Daydream VR stage in 2016)
- Various user accounts (tablets as it were)
- Revised Bluetooth stack, changing from Bluez to Broadcom open source BlueDroid, permitting enhanced help for different showcases and remote show (Miracast)
- Local ideal to-left, dependably on VPN and application verification. another NFC stack was included at the same time.
- Availability changes: triple-tap to amplify the whole screen, skillet and zoom with two fingers. Discourse yield and Gesture Mode route for dazzle clients
- New check application with worked in world clock, stop watch and clock
- All gadgets presently utilize a similar interface format, already adjusted from telephones on 4.1 for littler tablets (with focused programming catches, the framework bar at the highest point of the screen, and a home screen with a dock and focused application menu), paying little respect to screen estimate
- Expanded number of broadened notices and Actionable Notifications for more applications, enabling clients to react to specific warnings inside the notice bar and without propelling the application specifically
- Premium SMS confirmation
- Gathering Messaging
- Settled a bug in the People application where December was not shown on the date selector while adding an occasion to a contact
- Included Bluetooth gamepads and joysticks as bolstered HID (Human interface gadget)
- Settled Bluetooth sound gushing bugs
- Long-squeezing the Wi-Fi and Bluetooth symbols in Quick Settings presently flips the on/off state
- New download warnings, which currently demonstrates the rate and evaluated time staying for dynamic application downloads
- New sounds for remote charging and low battery
- New Gallery application activity permits quicker stacking
- USB troubleshoot whitelist
- Bugfixes and execution improvements