Bluetooth MAP support
Android now supports the Message Access Profile (MAP) so Bluetooth-enabled cars can exchange messages with your devices.
Chromecast support
With your Android device and a Chromecast, you can enjoy your favorite online entertainment, from Netflix, YouTube, Hulu Plus, and Google Play on your HDTV.
Chrome web view
Applications that embed web content now use Chrome to render web components accurately and quickly.
Closed captioning
Android now supports closed captioning and subtitles. To turn on closed captioning, go to Settings > Accessibility and turn on Captions.
Device management built-in
If you ever lose your device, you can find or wipe it with the Android Device Manager›
Downloads app redesign
The Downloads app has been redesigned, giving you new sorting options and list and grid views for all the files you’ve downloaded.
Easy home screen switching
If you love to customize your device and have installed one or more home screen replacements, you can switch between them easily in Settings > Home.
Email app refresh
The redesigned Email app has a fresh new look with nested folders, contact photos and better navigation.
Full-screen wallpapers with preview
Your wallpaper now extends through the notification tray and system buttons. And when you change your wallpaper, you can preview just how it will look before you set it.*
HDR+ photography
HDR+ mode on Nexus 5 automatically snaps a rapid burst of photos and combines them to give you the best possible single shot. Daytime pictures are vivid with clean shadows, and nighttime photos are sharp with less noise.*
Infrared blasting
On devices with an infrared (IR) blaster, Android now supports applications for remote control of TVs and other nearby devices.
Location in Quick Settings
Access your location settings from anywhere with a new tile in Quick Settings.
Location modes and monitoring
If you want to conserve battery, go to Settings > Location to switch between high accuracy and battery-saving location modes. There’s no need to toggle GPS, Wi-Fi, and mobile network settings. And to see which apps have recently requested your location, go to Settings > Location.
Low-power audio playback
Android 4.4 on Nexus 5 lets you listen to music for longer - up to 60 hours of audio playback.*
Music and movie-seeking from lock screen
Jump to a specific part of a song or video from your lock screen. Just long press on the play or pause button and then select the point you want.
Secure app sandboxes
Application sandboxes have been hardened with Security-Enhanced Linux.
Step counting built-in
When you use fitness apps like Moves on Nexus 5, the phone acts as a pedometer to count steps. Android 4.4 and updated hardware make this a more battery-friendly way to measure your activity.
Tap to pay, built a new way
Android 4.4 introduces a new, open architecture for NFC payments that works with any mobile carrier, and lets apps manage your payment information in the cloud or on your device. Now you can tap to pay with Google Wallet or other apps at more than a million stores.
Touchscreen improvements
Improved software and Nexus 5’s new hardware mean Android responds to your touch faster and more accurately than ever before.*
*Currently only available on Nexus 5
source:android
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