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Posted by The Jetpack Compose Team

From delightful doggos to creative countdowns and storming weather apps, the 2000 submissions to the #AndroidDevChallenge blew our socks off. We are truly amazed at the creativity and beauty of the apps you built with Jetpack Compose, Android's new UI toolkit. Now that we judged the final challenge, let's wrap up, look back at this incredible journey and find out who the winners are!

Week #1 - Puppy adoption app 🐶

The week that made us say "Aww" every time we check out our social media timelines. With this challenge you took your first steps with Compose and learned how to work with lists.

We already shipped the prizes to the first 500 successful submissions: a limited edition trophy of our Jetpack Compose superhero, made of LEGO bricks.

Week #1 prize: Jetpack Compose superhero

Week #2 - Countdown timer ⏲️

When time came to implement a countdown timer, you didn't disappoint! This challenge showed us that you mastered state and animation in Compose.

The first successful 500 submissions already got this week's prize: a Compose poster pack.

Week #2 prize: a Jetpack Compose poster pack

Week #3 - Speed round 🏎

We couldn't believe how fast you were! This week you had to implement a design provided by us (the designs are still available if you want to try your hand at them in your own time). We opened the challenge in 3 different time zones, each with its own design to build. Here are the winning projects and the time it took to implement each of them:

• WeTrade Jorge Baños - 2h 43min
• MySoothe Nezih Yılmaz - 2h 44min
• Bloom Takaki Hoshikawa - 5h 57min

It was incredible seeing how quickly the winners worked with themes and layouts in Compose; scoring themselves a Pixel 5 each!

Week #4 - Weather app 🌤

Come rain or shine, Android developers don't disappoint! This week it rained… Compose weather apps. We judged them on 4 categories: code quality, novelty of idea, visual beauty and overall execution. As you made our job quite hard, we got some help from some of our Google Developer Experts to decide the winning projects:

Code quality: Paulo Pereira - JetWeatherfy

Novelty of idea: Roman Levinzon - Colony X Weather

Visual beauty: Chris Horner - Weather Scene

Overall execution: Corentin Bect - Flux

The winners each got a Google Pixel 5!

It was incredible to see what thousands of you built in this Jetpack Compose #AndroidDevChallenge. We hope that the challenge gave you a fun way to start learning Jetpack Compose and get ready to adopt it in your apps. If you're new to Compose or want to dig deeper, check out our docs, codelabs & samples:

• Docs
• Codelabs
• Samples

Have fun composing!

12 May 2021 4:04pm GMT

Posted by Suzanne Frey, VP, Product, Android Security and Privacy

We work closely with developers to keep Google Play a safe, trusted space for billions of people to enjoy the latest Android apps. Today, we're pre-announcing an upcoming safety section in Google Play that will help people understand the data an app collects or shares, if that data is secured, and additional details that impact privacy and security.

Developers agree that people should have transparency and control over their data. And they want simple ways to communicate app safety that are easy to understand and help users to make informed choices about how their data is handled. Developers also want to give additional context to explain data use and how safety practices could affect the app experience. So in addition to the data an app collects or shares, we're introducing new elements to highlight whether:

1. The app has security practices, like data encryption
2. The app follows our Families policy
3. The app needs this data to function or if users have choice in sharing it
4. The app's safety section is verified by an independent third-party
5. The app enables users to request data deletion, if they decide to uninstall

This can be a big change, so we're sharing this in advance and building with developers alongside us.

What this section will include

Among other things, we'll ask developers to share:

• What type of data is collected and stored: Examples of potential options are approximate or precise location, contacts, personal information (e.g. name, email address), photos & videos, audio files, and storage files
• How the data is used: Examples of potential options are app functionality and personalization

Similar to app details like screenshots and descriptions, developers are responsible for the information disclosed in their section. Google Play will introduce a policy that requires developers to provide accurate information. If we find that a developer has misrepresented the data they've provided and is in violation of the policy, we will require the developer to fix it. Apps that don't become compliant will be subject to policy enforcement.

What you can expect

All apps on Google Play - including Google's own apps - will be required to share this information and provide a privacy policy.

We're committed to ensuring that developers have plenty of time to prepare. This summer, we'll share the new policy requirements and resources, including detailed guidance on app privacy policies. Starting Q2 2022, new app submissions and app updates must include this information.

Target Timeline (Dates subject to change)

In the future, we'll continue providing new ways to simplify control for users and automate more work for developers.

In the meantime, here are some resources to help you design secure & privacy-friendly apps

• Review what you collect, send to your servers, or share with 3rd parties
  • See tips on how to audit and interpret SDK and library data access
• Review our resources for building privacy-friendly apps:
  • Privacy best practices
  • Play Academy: Privacy and Security by Design
• Review our resources for building more secure apps:
  • Security best practices
  • Working with data more securely

We're excited to advance our partnership with developers to make Google Play a trustworthy platform for everyone.

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06 May 2021 4:28pm GMT

Posted by Jamal Eason, Product Manager, Android

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 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

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

• 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

• 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.

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

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

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.

// build.gradle.kts

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

04 May 2021 5:42pm GMT