一、Performance（性能）
1、Vulkan 图形处理
vulkan作为Android底层图形处理API，提供了3D渲染能力，降低了GPU/CPU资源占用。
2、JIT Compiler：
JIT Compiler app installs are 75% faster, all while using 50% less space，ART manage the AOT/JIT compilation for each app according to its actual usage, as well as conditions on the device. For example, ART maintains a profile of each app‘s hot methods and can precompile and cache those methods for best performance. It leaves other parts of the app uncompiled until they are actually used.
二、Security：
File-Based Encryption
hardening the security of the media framework
rearchitected Mediaserver
seamless updates
Android N devices can also install system updates in the background. So the next time a user powers up a device, it can automatically switch into the new updated system image.
三、Security：
File-Based Encryption
hardening the security of the media framework
rearchitected Mediaserver
seamless updates
Android N devices can also install system updates in the background. So the next time a user powers up a device, it can automatically switch into the new updated system image.
四、Productivity :
multi-window
Split-screen mode 分屏 Handheld devices running Android N offer split-screen mode.
Freeform mode 像pc一样，自由控制窗口大小和位置 Manufacturers of larger devices can choose to enable freeform mode， If the manufacturer enables this feature, the device offers freeform mode in addition to split-screen mode.
Picture-in-picture mode（TV）窗口悬浮 Android TV users can now watch a video in a pinned window in a corner of the screen when navigating within apps
notification (快速回复)
unicode 9 ，emoji表情
Clear All button 一键关闭后台应用
五、Others
DOZE MODE 提高手机续航，手机关闭屏幕一段时间后，进入浅度睡眠，当手机静止不动一段时间后，进入深度睡眠。
Data Saver 控制app流量使用，通过设置白名单。
Quick Switch 双击“最近”（Recents）按钮，2个应用间快速转换
支持Java 8
屏幕尺寸放大
分组通知 将相同应用的通知捆绑在一起，实现分组显示，并且通过两指滑动实现预览
支持VR
