Posted by Florina Muntenescu, Developer Relations Engineer
3...2...1… Time for another challenge! Welcome to the second week of the #AndroidDevChallenge! We loved seeing your creative submissions in week #1 so we can’t wait to see what you’ll build in week #2. Here’s your challenge:
Create a working, single screen countdown timer. You have until March 9th, 23:59 PST to submit your entry.1
Your UI must be fully built in Compose. To help you with the implementation, check out the Compose documentation on state and animation. For some hands-on learning try out the Compose pathway, with codelabs covering several topics useful for completing this challenge.
Your solution must be implemented in a GitHub repository. Make a copy of this Github repository template and follow the instructions in the README. The template contains a basic Hello World! in Compose and a continuous integration setup.
Hello World!
Our second week's prize is a work of art, where the Composing is a collaboration with you! The first 500 people to successfully complete this challenge will receive a Jetpack Compose poster and a set of Android pencils, your own stress relieving coloring experience. Plus, you'll get a limited edition Jetpack Compose comic strip poster, charting how Team Jetpack saves the galaxy from bad UI.
Week #2 prize: a Jetpack Compose poster pack
Community is at the heart of Jetpack Compose and your feedback helps us build a better product:
1 Please review the link for the full official rules associated with the entry.
Posted by Tom Grinsted, Product Manager, Google Play
Today in Google Play Console, we’ve launched a suite of new metrics* and unique comparative benchmarks. Using these, you can evaluate your app or games’ engagement and monetization trends against up to 250 different peersets, helping you make better, more informed decisions about your product roadmaps and opportunities.
Whether you want to prioritize new features to drive engagement, experiment with pricing, or drive up retention, we hear from all developers that they need great data and insights to help make the best investments.
While some larger developers can compare data from across their portfolios, this isn’t always possible — for instance, when entering a new territory, if you don’t publish directly comparable apps, or if you only publish one or two games in the first place. In these types of cases, how do you know if your app or game’s performance is good and where you can be better?
With this launch, we’re here to help all developers better contextualize and understand their performance. Here’s what’s new:
New engagement and monetization metrics
In partnership with experts in mobile apps and games growth, we’ve introduced a new set of engagement and monetization metrics based on best practices in evaluating app and game performance. These include:
In total, we’re launching 15 new normalized metrics with benchmarks, and making the absolute numerators and denominators available to query, too. They can all be found in the new “Compare to peers” tab in the Statistics page*. For convenience, we’ve included other key normalized metrics, like store listing conversions, here too.
Track your performance with peerset comparison
To power your decision-making and help you discover areas of opportunity, all of these new normalized metrics are launching with peerset comparison performance as standard. You’ll be able to track your metrics over time and compare up to 250 different types of apps and games such as “Match-3 games,” “Audiobooks,” or “Comics.”
Compare your performance to peers on the Statistics page in Google Play Console.
Country filters allow you to customise these insights to suit your business needs. For instance, you’ll be able to see if games similar to yours are driving more revenue from users in Japan, or if your team’s latest feature drop means that you’re outperforming other similar apps in terms of loyalty in India.
During our development process, we tested this suite of new insights with select partners. As well as useful in shaping our approach, their feedback has been positive:
Guy Ulmer, Plarium Global Ltd.
To help you make the most of these new metrics and insights, we’ve launched a new course on Play Academy to get you up to speed. You can also check out our masterclass webinars about super-powering your growth.
Strong privacy protections for users and developers
The data powering these new metrics comes from users who have agreed to share their app activity with Google, and is modeled to better represent the whole population. The data simply records if an app is opened in the foreground. Users have control over their data and can opt out of sharing it, or delete individual events, in myactivity.google.com.
Additionally, these new developer metrics are our first to use differential privacy - an advanced technique that provides increased privacy protections across datasets. You can find out more about this approach in our technical blog.
Just like previous benchmark launches, all of the peer comparison metrics come with protections for developer privacy. The data is generated from a large number of apps and games, and the peer groups, driven by Play Store’s advanced tagging system, do not share the performance of individual apps. So although you can find high-quality, reliable, useful peerset comparisons we've worked to obscure the performance of any individual competitor’s app from the peersets you see, and obscure your apps' performance in peersets too.
More to come
This is the first launch of a multi-year project to bring more helpful insights and active recommendations to Google Play Console. The largest mobile app developers often use growth consultants to help inform their long-term strategic product decisions. We’re dedicated to bringing this kind of help and expertise to all Play developers via the console. So look out for more launches over next year!
*Please note you need a Google Play Console account to access these links.
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Posted by Eric Bahna, Product Manager
In January, we enabled the Google Play Store to accept open testing submissions of navigation, parking, and charging apps. It’s great to see many of you developing Android Auto apps and sending us feedback through the issue tracker. Thank you for helping us improve the platform so we deliver better in-car experiences together! Drivers have been sending positive feedback, too, as new apps launch to open testing, like Chargemap.
Chargemap in Android Auto
Today, we’ve reached the next milestone: the Android for Cars App Library is available in Jetpack as androidx.car.app 1.0.0-beta01! The move to Jetpack makes the library open source, gives you more visibility into our feature development, and provides API consistency with other Jetpack libraries. We’ve updated the developer guide and design guidelines to cover androidx.car.app. Test your app with Android Auto 6.1, or later, then you can publish your app to open testing in the Google Play Store. androidx.car.app includes all functionality of the closed source library (com.google.android.libraries.car), and then some! For example, we added a new GridTemplate, which is useful when users rely primarily on images to make their selections.
androidx.car.app 1.0.0-beta01
androidx.car.app
com.google.android.libraries.car
Examples of the new GridTemplate in androidx.car.app
On September 1, 2021, the closed source Android for Cars App Library (com.google.android.libraries.car.app) will no longer be available and the Google Play Store will not accept submissions that use com.google.android.libraries.car.app. Our development focus from now, including new features, is on androidx.car.app. We encourage you to migrate now and we’ve created a migration guide that makes it easy. Migration usually takes less than a day, in our experience with early access partners.
com.google.android.libraries.car.app
We’re working hard to stabilize androidx.car.app and prepare the Google Play Store for production submissions. Production submissions will require androidx.car.app and you can get your app ready by using it in open testing today.
Luli Perkins, Developer Relations Program Manager
Our second edition of #AndroidDevJourney is here! At the beginning of this year we launched the #AndroidDevJourney to share the stories of members of our community through our social platforms. Each Saturday, from January through June, we’ll feature a new developer on our Twitter account.
For a chance to be featured in our March spotlight series, tweet us your story using #AndroidDevJourney.
Tell me about your journey to becoming an Android Developer and how you got started.
In 2012 I was working as a contractor for the NSW government here in Australia as a Java J2EE web developer. I'd been in that role for 11 years, building web apps for students and teachers. However, in 2012 the government decided that contractors were expensive and let us all go. So while in my hand-over period I'd read about some kids who were writing Android apps and making lots of money doing so. The Android Market was new and so any app uploaded got a large audience, and since I already knew Java it seemed like switching from a web developer to a mobile developer might be a smart career move. So I purchased a new phone, the HTC Legend and spent the next 2 weeks learning everything I could about Android apps. It was the first time I could run software I'd written on a device made by someone else that I could carry around with me. It was a very exciting time where any app idea seemed possible.
When my contract finally ended, I managed to get a new job working for a mobile development agency and started working on Android apps for their clients. In order to learn more about Android app development, I started to attend the local Android meetups and Google Developer Group events, listening to speakers (mostly from Google) and trying to improve my skills as an Android developer.
In 2013 I was offered the opportunity to become the organiser of the Sydney GDG and it was that year that I also attended my first Google I/O (I've been every year since). One of the hard parts about being a GDG organiser is finding speakers, so occasionally if there were no speakers, or if a speaker dropped out at the last minute, I would step in and give a talk instead. 2013 was also the year I decided to move on from the mobile agency I was working at, and I spent the next 5 years working as a freelance contractor, working with clients such as eBay, the Sydney Opera House, and one of the large banks in Australia. Being the organiser of GDG Sydney and a regular speaker at the meetups meant finding work was quite easy.
In 2016 because of all the speaking I was doing I was approached to join the Google Developer Experts program, at this time I was doing regular talks at both the GDG Sydney and Android meetup events every couple of months. When I joined the GDE program, I handed over my GDG responsibilities to some friends, who still run it to this day. As part of the GDE program I've been lucky enough to attend many Google I/O events, and I've also had the opportunity to speak at conferences all over the world, including DroidCon Boston, Mobile Era in Oslo, DevFest Melbourne, DroidCon Singapore, Chicago Roboto and many others. Having the chance to speak to so many people all over the world has been very rewarding, and I've made many friends.
In 2019 I joined the company where I work today - mx51, I'm the lead Android developer designing and building apps that run on payment terminals, which also integrate with Point of Sales systems. I'm still a GDE but with the 2020 madness the ability to speak at in-person events was severely hindered. I hope that in-person events will start again soon and that I can continue my journey as a GDE.
What’s one shortcut, tip, or hack you can’t live without?
Android development is constantly changing and advancing, so there is always something new to learn. My tip would be to always be learning, there are lots of ways to do this, subscribe to the Android Developers YouTube channels and Medium publications. Follow Googlers and Google Developer Experts on Twitter for new tips and posts. Subscribe to the Android Weekly newsletter for an overview of new libraries and blog posts, and attend your local GDG chapter and Meetups. Not only are these great ways to learn new aspects of Android development, but with meetups they're a great place to meet other Android developers, share successes, and ask for advice on problems.
What's the one piece of advice you wish someone would have given you when you started on your journey?
When I started out as an Android developer, I could never have dreamed about being a Google Developer Expert, travelling the world and speaking at large events. It took me a long time to learn that it's ok not to know the answers to people's questions. If at an event someone asks something you don't know, it's ok to say so. You can always say that you'll find out later and get back to them. There is no need to make up a wrong answer on the spot and lead someone off course. People are often scared that a topic they're presenting might not be the best or greatest way to do something, and they fear looking stupid. If a person in the audience suggests a better way that shouldn't be a worry, 1) you learnt something, 2) everyone else learnt something and 3) there may be scenarios where your solution is better and a discussion can be had. So my advice would be, when speaking don't fear questions but embrace the opportunity to help someone immediately, or later, or perhaps discover something new yourself.
I dabbled in Android development in college with the student mobile development group, but it wasn't until I was a few years in web development I made the real switch over. Back in my web dev days, I joined the Kotlin community, where I felt immediately welcome. Shortly after, I moved to Chicago a few years back when I heard there was a Kotlin community in the tech scene.
Getting up to speed with Android at a professional level is a whole different game, and I've been lucky to find the overlapping Kotlin/Android community both locally and globally. Android development has accelerated my career technically and professionally, yet the world is so deep and vast within the sandbox of Android development.
Already being an active enthusiast with Kotlin, it only felt natural to switch to Android, and I've never looked back. Since then, I've been working scalable and complex Android applications, and contributing with some technical writing along the way. I'm currently co-writing with my colleague, Pierre Laurence, on “Programming Android with Kotlin: Achieving Structured Concurrency with Coroutines with O'Reilly”, and I'm excited to have it come out sometime this year.
For larger projects, it's sometimes hard to locate the file you're looking at in your Project view. You can use the target symbol ⊕ to get a highlight the file you're currently on in Android Studio.
Only install LeakCanary when, and only when, you and your team is ready for that conversation 😁
My journey as a developer started as a child. As a kid, I was obsessed with robots. I remember my dad bought me a Lego set called Lego Mindstorm, which was basically a robotics set with sensors and motors, plus it was also programmable. After graduating high school, I enrolled in the US Army as an Aviation Maintenance Repairer. After 6 years, I was honorably discharged then enrolled in college at Fordham University. In 2014, I received a Bachelor of Science in Computer Science. About 2 years later, I met my now wife, and together we started building EatOkra as a way for us to find black-owned restaurants in Brooklyn, NY. As we introduced the application to new people, they shared it with their network; before we knew it, many people were asking us to cover more areas in the south.
Learn how to ask the right questions.
One piece of advice I wish I took more seriously was to not build an application using beta technology. EatOkra's MVP was created using a beta version of a software framework. It started out good but then as they made updates, at times, I ended up having to wait months for certain issues to get fixed. I also had to completely stop and restart the app with an entirely new code base because the company decided to change how they architected the code. I learned a lot but it was painful to navigate.
My journey started a couple of years ago (I was still in college) when I saw the Android Developer Udacity course. There was no nano degree back in the day. So once I saw it, I started building some apps for myself. From there, I applied for my first job as a junior developer in a big consulting firm. Then I started seeing more courses and started following a lot of people at Twitter, like Sam Edwards and Joe Birch (both GDE). The community made me grow and learn. A couple of years later I got my first team and I began delivering speeches at conferences and keeping up my Medium blog on the side. The community offers me feedback and knowledge, and especially a place to learn. My first conference was with WomenWhoCode.org here in Mexico. They opened a place for me without any experience. The same happened with Google Developers Groups here in Mexico City.
I became a Lead Engineer during my second job and I began doing worldwide conferences. I asked for feedback from Sam Edwards and Carlos Muñoz (also GDEs in Colombia) and they told me not to worry because I would amazingly and they encouraged me to keep doing it.
I got a really nice offer to start from scratch here as a Mobile Platform engineer in Mexico City with a huge fintech Startup (Konfio.mx). This is my current job, which means I am in the architectural office where we choose new ideas and new processes and pretty much service all the areas in the company.
I started creating a group of series to teach people some specific topics that I noticed were not deeply addressed. I also started getting involved in Kotlin Multiplatform and then I was reached out to by two GDE that nominated me to become GDE, Walmyr Carvalho, and Sam Edwards. They offered me feedback about my latest talks, podcast, and series and I was accepted at the end of 2020. Right now, I'm trying to learn more and deliver more talks and blog posts to the community.
My special hack as an Android Developer is to use Wireless Debugging in the lastest Android Studio for physical devices. It is my favorite part because I don't need to use any cables and the setup is super easy!
My advice is that learning is a process, things change and all of this must be welcome because we are addressing the evolution of the platform as we code. Also, read everything you can because people in the community are amazing and they love to teach! Open an account on Twitter, because there are a lot of people giving tips in less than 180 characters.
The Android Developer community prides itself in its inclusivity and welcomes developers from all backgrounds and stages of life. If you’re feeling inspired and want to learn more about how to become a part of our community, here are a few resources to help get you started.
Dive into developer.android.com
Follow us on Twitter
Subscribe to our YouTube channel
The Google Developer Groups program gives developers the opportunity to meet local developers with similar interests in technology. A GDG meetup event includes talks on a wide range of technical topics where you can learn new skills through hands-on workshops.
Join a chapter near you here.
Founded in 2014, Google’s Women Techmakers is dedicated to helping all women thrive in tech through community, visibility and resources. With a member base of over 100,000 women developers, we’re working with communities across the globe to build a world where all women can thrive in tech.
Become a member here.
The Google Developers Experts program is a global network of highly experienced technology experts, influencers and thought leaders who actively support developers, companies and tech communities by speaking at events, publishing content, and building innovative apps. Experts actively contribute to and support the developer and startup ecosystems around the world, helping them build and launch highly innovative apps.
Learn more about the program here.
Java is a registered trademark of Oracle and/or its affiliates.
Posted by Nick Grayson, Product Manager
Android works best when it helps developers create apps that people love. That’s why we are dedicated to providing useful APIs like Activity Recognition which, with the user’s permission, can detect user’s activities (such as whether a user is biking or walking) to help apps provide contextually aware experiences.
So much of what we do relies on a good night's rest. Our phones have become great tools for making more informed decisions about our sleep. And by being informed about sleep habits, people can make better decisions throughout the day about sleep, which affects things like concentration and mental health.
In an effort to help our users stay informed about their sleep, we are making our Sleep API publicly available.
The Sleep API is an Android Activity Recognition API that surfaces information about the user’s sleep. It can be used to power features like the Bedtime mode in Clock.
This sleeping information is reported in two ways:
The API uses an on-device artificial intelligence model that uses the device’s light and motion sensors as inputs.
As with all of our Activity Recognition APIs, the app must be granted the Physical Activity Recognition runtime permission from the user to detect sleep.
Developers spend valuable engineering time to combine sensor signals to determine when the user has started or ended activities like sleep. These detection algorithms are inconsistent between apps and when multiple apps independently and continuously check for changes in user activity, battery life suffers.
The Sleep API is a simple API that centralizes sleep detection processing in a battery-efficient manner. For this launch, we are proud to collaborate with Urbandroid, the developer of the popular alarm app, Sleep As Android
Sleep as Android is a swiss army knife for getting a better night’s rest. It tracks sleep duration, regularity, phases, snoring, and more. Sleep Duration is one of the most important parameters to watch for ensuring a good night’s rest. The new Sleep API gives us a fantastic opportunity to track it automatically in the most battery efficient way imaginable. - Sleep as Android Team
- Sleep as Android Team
The Sleep API is available for developers to use now as part of the latest version of Google Play Services.
This API is one step of our efforts to help our users get a better night's rest. We look forward to working more on this API and in this area in the future.
If you are interested in exploring or using this API, check out our API Documentation.
Posted by Erica Hanson, Global Program Manager, Google Developer Student Clubs
Google Developer Student Clubs, a program of university based community groups for students interested in Google developer technologies, recently started hosting study groups called Android Study Jams. The goal? Learn Android app development through hands-on codelabs in an online curriculum provided by Google. There are two tracks: one for students who are new to programming, and one for those who already have experience. Interested in participating? Facilitator materials are available for anyone to host Android Study Jams in their community - take a look and get to building.
Google Developer Student Clubs are dedicated to helping students learn programming together, among peers, in a fun and interactive setting. While over 50 thousand students from all over the world have participated in these Android workshops, we wanted to highlight the exciting work from groups in Indonesia, Turkey, and Nigeria. From programming in Kotlin to building a series of apps, these students have put their minds to work.
Learn more about what these three clubs have been up to below.
Indonesia
(Image from UNPNVJ’s Android Study Jams where students are learning Kotlin)
Club members from Universitas Pembangunan Nasional Veteran Jakarta in Indonesia recently came together to host a virtual Android Study Jams session with over 60 students to learn the basics of building Android apps. Their student-run learning session covered several topics, including:
After the students felt comfortable with the basics of Kotlin and Android Studio, they combined their new skills to create their own layouts for a birthday card app.
(Image of Birthday cake app)
We can’t wait to see what the students from UPNVJ build next on Android thanks to their new programming skills.
Turkey
(Image from Medipol University where Nelson Glauber is teaching students the basics of Android App Development)
Medipol University in Turkey also hosted their own Android Study Jams by organizing a livestream with over 500 participants. Nelson Glauber, who was the first Google Developer Expert for Android in Latin America, led the event and helped students learn more about topics like:
After taking students’ questions, Nelson worked with them to build an interactive dice roller app that updates the screen after the results of a roll.
(Image of Dice Roller app)
Nigeria
The Google Developer Student Club at Kaduna State University in Nigeria tackled different codelabs and learning pathways in their Android Study Jams. In particular, the group worked on the following topics:
With these new skills, the group is now able to start working on building more advanced apps that allow users to navigate between multiple screens.
(Gif of Cupcake app)
How to join a Google Developer Student Club and Android Study Jams
If you’re a university student looking to learn more about programming alongside a community of your peers, sign up for a Google Developer Student Club near you here. As a part of the community, you’ll have access to special learning opportunities, including Android Study Jams, on many of Google’s developer products.
If you want to lead your own Android Study Jams or explore other free resources for learning Android development, click here.
Posted by Anna-Chiara Bellini, Product Manager, Nick Butcher, Developer Relations
Today, we’re launching the beta release of Jetpack Compose, our new UI toolkit designed to make it faster and easier to build native apps across all Android platforms. Compose offers modern, declarative Kotlin APIs, helping you build beautiful, responsive apps with way less code. Built to integrate with existing Android apps and Jetpack libraries, you can adopt Compose at your own pace by combining Android Views and Compose.
With this beta release, Compose is API complete and has all the features you need to build production-ready apps. Beta also means API stable, so we won’t change or remove APIs. Now is a great time to start learning Compose and begin planning for how you will use it in an upcoming project or feature once it reaches 1.0 later this year.
Our team has been developing Compose in the open with feedback and participation from the community. Since open sourcing development in 2019, we’ve had 30 public releases, addressed over 700 external bugs, and accepted over 200 external contributions. We love seeing what you’ve been building with Compose and have used your feedback and feature requests to refine our APIs and prioritize our work. Since the alpha release, we’ve added and improved a number of new features:
For the beta release, we’ve been focused on ensuring API completeness; that all foundational APIs are in place for us to continue to build upon for 1.0 and beyond. We’ll work on stabilizing these APIs up to our 1.0 release with particular focus on app performance and accessibility.
Compose Beta is supported by the latest Canary of Android Studio Arctic Fox, which features many new tools:
🆕 Animation Preview: inspect and playback animations
🆕 Compose support in the Layout Inspector
🆕 Interactive preview: inspect and interact with a Composable in isolation
🆕 Deploy Preview: to deploy a Composable on your device without needing a full app
Live Literals on Android Emulator
Layout Inspector for Jetpack Compose
Jetpack Compose is designed to work seamlessly with Android Views, letting you adopt at your own pace. You can embed Compose UIs within Android Views and use Views within Compose. We lay out a number of adoption strategies in our interoperability documentation.
In addition to View interop, we integrate with common libraries to help you to add Compose to your existing applications—no need to rewrite or re-architect your app. We offer integrations with:
The MDC-Android Compose Theme Adapter and Accompanist libraries provide integrations with Material and AppCompat XML themes so you don’t need to duplicate theme definitions. Accompanist also offers wrappers for common image loading libraries.
Jetpack Compose is a declarative UI toolkit, a paradigm shift from the current View system, where you describe what your UI should look like for a given application state, not how to produce it. Compose takes care of updating your UI when your app state changes, so you don’t have to manipulate your UI into the desired state which can be tedious and error prone.
Built entirely in Kotlin, Compose takes advantage of its great language features to offer powerful, succinct, intuitive APIs. Coroutines for example enable us to write much simpler async APIs such as describing gestures, animation or scrolling. This makes it easier to write code that combines async events, like a gesture which hands off to an animation, all with cancellation and clean-up provided by structured concurrency.
To help you and your team learn all about Jetpack Compose, we’ve updated our learning pathway; a curated list of videos, hands-on codelabs and key docs to get you started. Today we’re releasing new & updated documentation guides, a number of screencasts and a new Animation Codelab to help dive deeper into how to build with Compose. From guidance on architecture, accessibility and testing, to deep dives into animation, lists or thinking in Compose, we have guides to help you get up to speed.
We also offer 8 official sample applications if you want to jump straight in and see Compose in action. We have simple to complex samples, each showcasing different APIs and use cases. Check the readme for more details.
If you’re ready to get started with Compose–and also want to win some prizes along the way, check out the #AndroidDevChallenge. For the next four weeks, we’ll have weekly challenges designed to give your very own insights into Jetpack Compose, so you can fly through your projects. Compete to win new prizes for each challenge, with over one thousand prizes to win including a Google Pixel 5. You can read more about the first weekly challenge - starting today - right here.
With Jetpack Compose reaching Beta—with stable APIs and feature complete for 1.0—it's a great time to start learning Jetpack Compose and planning how you might use it in an upcoming project. We’d love to hear your feedback on adopting Compose in your app or join the discussion in the Kotlin Slack #compose channel.
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