Android N Developer Preview: what is it?
Available on some Nexus devices (Nexus 6P, Nexus 5X, Nexus 6, Pixel C, Nexus 9 and Nexus Player), the Android N Developer Preview is a test version of the new Android software, primarily intended for developers. Like previous Developer Preview versions (such as Android M, which later became Android Marshmallow), the first version of this software does not contain all the new features of the next version of Android, but only parts.
The first update to the Developer Preview was released on March 17. The factory images are available for the Nexus 5X, Nexus 6P, Nexus 9 and Nexus 9 LTE. If you're signed up to the Android Beta Program, you can expect to see the update arrive over the air very soon.
Developer Preview 2 was released on April 13. The latest version adds the ability for apps to define intent shortcuts, meaning users can use launchers to create shortcuts, like adding a memo to the calendar, with just one press.
Emoji Unicode 9 support is now incorporated, and a variety of APIs see inclusion, including Vulkan, which is intended primarily to improve gaming performance.
This update should roll out to your device OTA if you're part of the Android Beta Program, otherwise you can download and flash it manually by grabbing the image from Google.
Google said that the final version of Android N will be sent to all manufacturers this summer.

Android N Developer Preview: what's new?
Menu between the system settings
A hamburger menu button (the icon with three lines) has now been embedded into the system settings. When a user is in the Bluetooth menu, for example, they can quickly jump to the other system options using this left side menu. This menu is already a standard in other Google applications.

Reply to messages from the notifications bar
Of the new additions, this is possibly the feature which most resembles Apple iOS. Messages can now be answered from the notification itself. With this, the user will not need to leave an app to answer a message or even unlock their phone.
Multi-window mode
As we saw in the Android M developer preview, Google has been working hard to bring a native and efficient multitasking system to Android. Although the function was eventually omitted from Android 6.0 Marshmallow, with Android N, Google now seems ready to make the leap.
The image below shows the multi-window feature, which works on both tablets and phones and mirrors what you can currently get on some Samsung and LG devices.
Like most major platform changes, developers will have to opt in for the split screen mode to allow their apps to run smoothly. This can be done by adding a new attribute called: resizableActivity.

This attribute allows developers to specify the minimum size the app can be resized to and to determine whether resizing will be immediate or the application needs to restart with the required dimensions.
New Notifications panel
The notification panel has been completely redesigned, perfectly aligning with what we had seen in earlier leaks. Icons above the notification shade are now more prominent, and on the far right there is a dropdown toggle to expand the panel.
It is now possible to respond to messages directly from within a notification, a feature that uses the same RemoteInput API that Android Wear makes use of.

Notifications can now also be "stacked", optimizing the space in the notification area.
Developers can choose to stack notifications from the same application in a single line. These can then be expanded using the expansion button or a two-fingered gesture.
IT also supports :-
1.3D Touch
2.VR mode
3.Multi Window Support
4.Enhanced the Doze Mode.
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