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Android Developers Blog
The latest Android and Google Play news for app and game developers.

Android Studio 4.2

04 May 2021
[unnamed]

Posted by Jamal Eason, Product Manager, Android

Android logo

We are excited to announce that Android Studio 4.2 is now available
to download in the stable release channel. The focus areas for this
release is an upgraded IntelliJ platform and a handful of new
features centered around improving your productivity as an Android
app developer.

We know sometimes upgrading your app project to the latest version
can be complicated. To address this, we have a new app project
upgrade assistant in Android Studio 4.2 that makes it easier to
migrate your project and to take advantage of the latest Android
Gradle Plugin APIs. Additionally, we have added a whole range of
enhancements to the existing features like the Database Inspector,
System Trace, SafeArgs support, Apply Changes, the new project wizard
and more. If you use these features and you are looking for the next
stable version of Android Studio, you should download Android Studio
4.2 today!

Check out the list of new features in Android Studio 4.2 below,
organized by key developer flows.

Develop

  * IntelliJ Platform Update - Android Studio 4.2 includes all the
    major features and updates found in IntelliJ IDEA Community
    Edition 2020.2, which includes an updated GitHub UI for pull
    requests, and new centralized problems window, and more. Learn
    more.

  * Safe Args Support - Using Safe Args is the recommended way to
    ensure data encapsulation if you want to pass data between two
    destinations in your app when you are using the Jetpack
    Navigation component. With Android Studio 4.2, you now have code
    autocompletion for Directions Args, and code navigation from
    source to XML. Learn more.
                            safe arfs support

                            Safe Args Support

  * New Project Wizard and Module Wizard Updates - This release
    includes a visual refresh to the new project wizard to make it
    easier to discover Android device types, plus we added
    ViewBinding to each of the templates as well. Furthermore, we
    also made a visual update to the new module wizards to make it
    easier to understand the variety of module types you can add to
    your app.

                New Project Wizard New Module Wizard

               New Project Wizard & New Module Wizard

Debug

  * Database Inspector Improvements - Managing and monitoring your in
    app database is easier to do with the Database Inspector. In this
    release we made a couple new enhancements. We added a new offline
    mode, so that you can still keep inspecting your app's databases
    after a process disconnects, making it easier to diagnose your
    app after a crash. And we added a handy query history option as
    well.

Query History with the Database Inspector

Query History with the Database Inspector

  * Retrace Command Line Tool - As part of your app compilation
    process, R8 obfuscates Kotlin and Java programming language code.
    This can make stack traces impossible to decipher since types and
    method names are obfuscated and shortened to reduce the memory
    footprint of your app. The Retrace command line tool deobfuscates
    these names and recovers inlined frames using a mapping.txt file,
    making stack traces understandable again The new standalone tool
    can be found at ./sdk/cmdline-tools/latest/bin/retrace. Learn
    more.

Build

  * AGP Upgrade Assistant - Migrating your project to the latest
    Android Gradle Plugin (AGP) can sometimes be tricky especially if
    you use deprecated APIs. To solve this and to better prepare you
    for the transition to the Android Gradle Plugin 7.0, we created a
    new upgrade assistant. The assistant allows you to toggle the
    commands that will be executed on your project to upgrade to a
    higher version of AGP, preview exactly which files will be
    affected by the AGP upgrade, and lastly globally update
    deprecated configurations.

AGP Upgrade Assistant<

AGP Upgrade Assistant

  * Apply Changes Enhancements - Apply Changes lets you push code and
    resource changes to your running app without restarting your app.
    In Android Studio 4.2 we have expanded the number of compatible
    changes with Apply Changes to include adding resources (which
    accounted for 23% of changes that needed a full restart) and
    adding static final fields (e.g. constants) when running on an
    Android 11+ device or emulator.

  * Android Gradle Plugin 4.2 - With AGP 4.2, we made a number of
    notable changes. First, we implemented a new resources compiler
    which should aid in improving build performance especially on
    Windows machines. Secondly, we have updated the default Java
    programming language to version 8. Lastly, we added support for
    the APK v3 and APK v4 signing format. Learn more about additional
    AGP updates here.

// build.gradle.kts

android {
   ...
   signingConfigs {
      config {
          ...
          enableV3Signing(true)
          enableV4Signing(true)
      }
   }
}

APK v3 and APK v4 singing support

Test

  * Multiple Device Deployment - Sometimes when you are developing
    and testing your app it is helpful to deploy your app on multiple
    devices to see the results. We brought back this feature from
    very early versions of Android Studio and integrated it directly
    into the device selection menu in Android Studio 4.2. To note, if
    you deploy tests to multiple devices you may be prompted to
    enable this behavior.

Multiple Device Deployment

Multiple Device Deployment

Profile

  * System Trace Improvements - To understand the fine-grained
    performance characteristics of your app, it helps to use the
    system trace features inside of the Android Studio profiers. With
    this release of Android Studio, system trace now has a new events
    table. With this new table view you can see; BufferQueue, RSS
    memory counters, and CPU core frequency all within a compact user
    interface. Profiler with new System Trace Events Table

    Profiler with new System Trace Events Table

    To recap, Android Studio 4.2 includes these new enhancements &
    features:

    Develop

      + IntelliJ 2020.2.3 Platform Update
      + Safe Args Support
      + New Project Wizard and Module Wizard Updates

    Debug

      + Database Inspector Improvements
      + Retrace Command Line Tool

    Build

      + AGP Upgrade Assistant
      + Apply Changes Enhancements
      + Android Gradle Plugin 4.2

    Test

      + Multiple Device Deployment

    Profile

      + System Trace Improvements

    Check out the Android Studio release notes, Android Gradle plugin
    release notes, and the Android Emulator release notes for more
    details.


Getting Started

Download

Download the latest version of Android Studio 4.2 from the download
page. If you are using a previous release of Android Studio, you can
simply update to the latest version of Android Studio. If you want to
maintain a stable version of Android Studio, you can run the stable
release version and canary release versions of Android Studio Arctic
Fox at the same time. Learn more.

We appreciate any feedback on things you like, and issues or features
you would like to see. If you find a bug or issue, feel free to file
an issue. Follow us -- the Android Studio development team - on
Twitter and on Medium.

Java is a registered trademark of Oracle and/or its affiliates.

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