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• Layout Editor: A new user interface designer that helps you visually design the layouts in your app. Features like blueprint mode and the new properties panel allow you to quickly edit layouts and widgets faster.
• Constraint Layout: A new powerful and flexible Android layout that allows you to express complex UIs without nesting multiple layouts. 
• Layout Inspector: Debug a snapshot of your app layout running on the Android Emulator or device. Inspect the view hierarchy and corresponding attributes.

• Firebase Plugin: Explore and integrate the suite of services offered by Firebase inside of Android Studio. Adding services like Analytics, Authentication, Notifications, and AdMob are just a few clicks away.
• Enhanced Code Analysis: Android Studio checks the quality of your Android app code. In addition to 260 Android lint and code inspections, this release includes new code quality checks for Java 8 language usage and a new inspection infrastructure for more cross-file analysis.
• Samples Browser: Referencing Android sample code is now even easier. Within the code editor window, find occurrences of your app code snippets in Google Android sample code to help jump start your app development.
• Improved C++ Support: Android Studio 2.2 improves C++ development with the ability to edit, build, and debug pre-existing Android projects that use ndk-build or CMake rather than Gradle. Additionally, the existing lldb C++ debugger is now even better with project type auto-detection and a Java language aware C++ mode that lets you use a single debugger process to inspect both Java language and C++ runtimes.
• IntelliJ 2016.1: Android Studio 2.2 includes all the latest updates from the underlying JetBrains product platforms IntelliJ.

• Jack Compiler Improvements: For those using the new Jack compiler, Android Studio 2.2 adds support for annotation processing, as well as incremental builds for reduced build times.
• Merged Manifest Viewer: Diagnose how your AndroidManifest.xml merges with your app dependences across your project build variants. 

• Espresso Test Recorder: Record Espresso UI tests simply by using your app as a normal user. As you click through your app UI, reusable and editable test code is then generated for you. You can run the generated tests locally, in your Continuous Integration environment, or in Firebase Test lab. 
• APK Analyzer: Drill into your APK to help you reduce your APK size, debug 64K method limit issues, view contents of Dex files and more.

Deeper Dive into the New Features 

• Layout Editor: Android Studio 2.2 features a new user interface designer. There are many enhancements but some of the highlights include: 
• Drag-and-drop widgets from the palette to the design surface or the component tree view of your app.
• Design surface has a blueprint mode to inspect the spacing and arrangement of your layout. 
• Properties panel now shows a curated set of properties for quick widget edits with a full sheet of advanced properties one click away.
• UI builder can edit menu and system preference files. 

The new Layout Editor in Android Studio 2.2 Preview

Edit Menus in the new Layout Editor

• Constraint Layout: This new layout is a flexible layout manager for your app that allows you to create dynamic user interfaces without nesting multiple layouts. It is distributed as a support library that is tightly coupled with Android Studio and backwards compatible to API Level 9. 

Constraint Layout

Start Layout Inspector

• Layout Inspector: For new and existing layouts, many times you may want to debug your app UI to determine if your layout is rendering as expected. With the new Layout Inspector, you can drill into the view hierarchy of your app and analyze the attributes of each component of UI on the screen. 

To use the tool, just click on Layout Inspector Icon in the Android Monitor Window, and then Android Studio creates a snapshot of the current view hierarchy of your app for you to inspect.

Layout Inspector

Develop

• Firebase Plugin: Firebase is the new suite of developers services that can help you develop high-quality apps, grow your user base, and earn more money. Inside of Android Studio, you can add Firebase to a new or existing Android app with the new Assistant window. To access the Firebase features click on the Tools menu and then select Firebase. You will want to first setup the brand new Firebase Analytics as the foundation as you explore other Firebase services like Firebase Cloud Messaging or Firease Crash Reporting to add your application. Learn more about the Firebase integration inside Android Studio here.

Firebase Plugin for Android Studio

• Code Sample Browser: In addition to importing Android Samples, the Code Sample Browser is a menu option inside Android Studio 2.2 Preview that allows you to find high-quality, Google-provided Android code samples based on the currently highlighted symbol in your project. To use the feature, highlight a Variables, Types and Methods in your code then Right Click to show a context menu for Find Sample Code. The results are displayed in a bottom output box.   

Code Sample Browser

Build

• CMake and NDK-Build: For those of you using the Android NDK, Android Studio now supports building CMake and NDK-Build Android app projects by pointing Gradle at your existing build files. Once you’ve added your cmake or ndk-build project to Gradle, Android Studio will automatically open your relevant Android code files for editing and debugging in Studio.

For CMake users, just add the path to your CMList.txt file in the externalNativeBuild section of your Gradle file:

CMake Build in Android Studio

For NDK-Build Users, just add the path to your *.mk file in the section of your Gradle file:

NDK-Build in Android Studio

To use incremental build with Jack add the following to your build.gradle file:

Enable Jack Incremental Compile Option

Jack will automatically apply annotations processors in your classpath. To use an annotation processor at compile-time without bundling it in your apk, use the new annotationProcessor dependency scope:

Enable Jack Annotation Processing

• Merged Manifest Viewer: Figuring out how your AndroidManifest merges with your project dependencies based on build types, flavors and variants is now easier with Android Studio. Navigate to your AndroidManifest.xml and click on the new Merged Manifest bottom tab. Explore how each node of your AndroidManifest resolves with various project dependencies.  

Merged Manifest Viewer

Test

• Espresso Test Recorder: Sometimes writing UI tests can be tedious. With the Record Espresso UI tests feature, creating tests is now as easy as just using your app. Android Studio will capture all your UI interactions  and convert them into a fully reusable Espresso Test that you can run locally or even on Firebase Test lab. To use the recorder, go to the Run menu and select Record Espresso Test.

Espresso Test Recorder

• APK Analyzer: The new APK Analyzer helps you understand the contents and the sizes of different components in your APK. You can also use it to avoid 64K referenced method limit issues with your Dex files, diagnose ProGuard configuration issues, view merged AndroidManifest.xml file, and inspect the compiled resources file (resources.arsc). This can help you reduce your APK size and ensure your APK contains exactly the things you expect.

The APK Analyzer shows you both the raw file size as well as the download size of various components in your APK. The download size is the estimated size users need to download when the APK is served from Google Play. This information should help you prioritize where to focus in your size reduction efforts.

To use this new feature, click on the Build menu and select Analyze APK… Then, select any APK that you want to analyze.

APK Analyzer

• Java-aware C++ Debugger:  When debugging C++ code on targets running N and above, you can now use a single, Java language aware lldb instance. This debugger continues to support great lldb features like fast steps and memory watchpoints while also allowing you to stop on Java language breakpoints and view your Java language memory contents.

• Auto Debugger Selection: Android Studio apps can now use debugger type “Auto.” This will automatically enable the appropriate debugger -- the Java language aware C++ debugger if enabled and otherwise the hybrid debugger for C++ projects.  Projects exclusively using the Java language will continue to use the Java language debugger.

Enable Auto Debugger for C++

Whats Next 

Download

If you are using a previous version of Android Studio, you can check for updates on the Canary channel from the navigation menu (Help ? Check for Update [Windows/Linux] , Android Studio ? Check for Updates [OS X]). This update will download a new version, and not patch your existing copy of Android Studio. You can also download Android Studio 2.2 Preview from canary release site.

For the Android Studio 2.2 Preview, we recommend you run a stable version alongside the new canary. Check out the tools site on how to run two versions at the same time.

We appreciate any feedback on things you like, issues or features you would like to see. Connect with us -- the Android Studio development team -- on our Google+ page or on Twitter. 

Whats hidden in Android 4.4? 

smartphones are really like computers in your pocket, and sometimes it is pleasant to get super-detailed in order to get a better understanding of how things are ticking over. 

In Android 4.4, Google has added a Process Stats area to the Developer Menu, which contains numerous types of data about which applications are running, what handling theyre utilizing and how long theyve been running since you booted up the phone. 

Its radiantly quirky, and perfect for the individuals who need to calibrate their handsets execution. 

2. Dismiss a Alarm before it troubles you

there are few social circumstances more awkward that an alarm that you probably wont need sounding during a gathering.Only appearing in public naked comes close, in our opinion. You may not think its very that compelling, however in any case youll be appreciative of Android 4.4s  advance alarm notification system. 

An hour before the alarm is because of fire, youll get a pop-up notification on your screen which permits you to reject it before it has opportunity to sound and make everybody in gathering take a look at you.

3.Link up your cloud storage accounts with Androids Storage Access Framework

Storage Access Framework is basically a grander way of saying all of your data can be accessed from one convenient menu. When youre prompted to place records youll recognize that a side-menu has all of your connected cloud storage accounts  -, for example, Drive, Dropbox and Box - Listed, so you can without much of a stretch draw content from these sources without needing to open numerous applications. Its one of Android 4.4s most powerful feature, yet it has gotten almost no consideration.

4. Keep an eye on your Data usage

Most carriers enforce data allowance limits these days, which means media-hungry mobile owners with their fingers in all kinds of cloud storage pies are at risk of running over and incurring prohibitive fees. 

Thank goodness then for Androids built-in data usage monitor, which tells you exactly how much youve been gobbling up via your mobile network. You can set warnings for when youre close to your limit, or have a ceiling that disables data traffic the moment it is reached. You can even specify a day in each month where your allowance renews and reset the data counter to zero accordingly.

5. Gain an easy speed boost by disabling animations

The animations that occur as you move between applications and screens might look pretty, but they can slow you down - especially as they essentially force you to wait a short period before moving to another page or loading an application. 

Thankfully, its possible to reduce the time they run for or disable them completely, both of which will make your handset feel faster. Go to Settings > Developer Options and scroll down to the Drawing section. Find the options which refer to animation scale (Window, Transition and Animator) and toggle them all to "Animation Off". Your UI might not be as pretty in motion, but it will be so fast you may even struggle to keep up.

6. Enable lock screen widgets

Lockscreen widgets are one of Androids more recent innovations, but in Android 4.4 theyre not enabled by default. To turn them on, youll need to drop into Settings > Security and tick the "Enable Widgets" box. To add widgets, simply swipe from left to right on your lockscreen and tap the "plus" icon. You can choose from Gmail, Calendar and Google Keep, amongst other things.

7. Switch launchers quickly

One of Androids big advantages over its rivals is the ability to change your launcher, which essentially means you can drastically alter the way your homescreen looks and behaves. 

Previously, switching between launchers was something of a pain, but Google has now added a quick and easy toggle in the settings menu - so now theres no excuse not to try the many amazing launcher alternatives available on the Google Play market. 

When you have more than one launcher installed on your phone, the Settings menu will show a new "Home" option - tapping this will bring up all of the available launchers on your device, allowing you to toggle between them quickly and easily.

8. Quick accessing Google Now

Screenshots 7If you’re fairly new to an up-to-date version of Android, you really need to check out Google Now. It’s a great sort of lifestyle assistant service that tracks where you are and what you like to make suggestions for things you might want to do with your phone at any time. 

Yes, it sounds creepy, but it’s actually really handy at times. 

To quickly skip over to Google Now, just hold down on the Home soft key key. If your phone has a physical key, it should head to Now directly, or if it’s a software one you’ll see a Google button pop up above – just drag your finger over it to shortcut to Now.  

Google Now provides ‘cards’ of information based on where you are and what you’re doing. If there’s nothing much there, just trying using it a bit more regularly as it learns from your patterns.

9. Remotely wipe your phone if you lose it

Losing your phone is a painful experience - especially if it provides your daily Flappy Bird fix - but the amount of data contained on our handsets means that having it fall into the wrong hands can have all kinds of negative ramifications. 

Google has your back, however, and provides the means to remotely locate and wipe your phone should it go walkabout. Youll need to enable it from the device before you lose it, though - go to the Google Settings application in your app drawer and select Android Device Manager, then turn on "Remotely Locate This Device" and "Allow Remote Lock And Factory Reset". 

The latter option also allows you to remotely change the lockscreen password, should you be too scared to wipe the entire device. In the event of your phone going missing, visit the Android Device Manager page online and you can choose to ring (even if the phone is set to silent), lock or wipe the phone.

10. Record your phones screen

Taking a screenshot in Android used to be like pulling teeth - you had to connect your phone to your PC in order to grab any kind of on-screen image. Since Android 4.0, weve had the trusty "Volume down and Power button" combo, but 4.4 goes to the next level - it features the ability to record video from your screen as well. 

11. Install an alternative SMS client

Android 4.4 tips 21Hangouts replaces the default SMS client in Android 4.4, and while it does the job perfectly well - integrating instant messaging and text chats - some people will no doubt long for the old way of doing things. 

Thankfully, its possible to specify a different app for SMS messages. Find one that you like on the Google Play market, install it and then go to the Settings menu within Hangouts. Tap SMS and then SMS Enabled, and youll be able to select the app you want to use.