The next release of Android Things Developer Preview 6 (DP6) is here with lots of new features and bug fixes. Android Things is Google's platform that enables Android Developers to create Internet of Things (IoT) devices with support for powerful applications such as video and audio processing and on-board machine learning with TensorFlow. For the specifics on what is new, visit the release notes. Here are a few of the highlights of what is in DP6.
DP6 includes a new IoT launcher that allows the user to see the current state of the device and change settings using a touch screen or USB input devices. Settings such as configuring the WiFi, finding the build ID, and checking for updates is now something that can be done interactively, making it even easier to get started. This launcher is visible when no other developer-provided IOT_LAUNCHER Activity is present.
Android Things uses the open-source SwiftShader library, a CPU-based implementation of the OpenGL ES APIs. This enables common OpenGL support across all platforms, even those with no GPU hardware. However, many simple 2D UIs render faster if the drawing is done directly to the framebuffer and OpenGL emulation is not used. In DP6, OpenGL rendering is disabled by default to ensure that most apps run with the fastest UI possible. If you need OpenGL support for 3D rendering, WebView, or TextureView, then explicitly enable it in your AndroidManifest.xml according to the documentation:
<activity ... android:hardwareAccelerated="true">
DP6 is now based on the latest Android 8.1 developer preview, with API level 27. Most of the standard Android samples now work on DP6. For example, the Camera2Basic sample using the Camera2 API and TextureView now works on both NXP and Raspberry Pi based devices (with the hardwareAccelerated flag set to true). Google Play Services has been updated to support SDK version 11.6, supporting all the latest features.
We heard from developers that flashing and configuring a board using fastboot can be tedious, so the Android Things Console now brings a new and simpler way of flashing device images. Instead of using fastboot and adb commands manually, a new interactive command-line android-things-setup-utility is now provided. This tool makes it much easier to get started with Android Things, and automates the download and flashing process.
android-things-setup-utility
DP6 introduces the new partition scheme that will be used for the upcoming production release. Due to the new partition layout, the over-the-air update (OTA) system cannot update existing DP5.1 or earlier devices. Developers will need to go to the Android Things Console, and download and flash a new DP6 build. The Console UI has also been changed for DP6 features, and will only allow you to create new builds based on DP6. If you have any older existing builds, they are still available for download but will not support OTA updates. Developers are encouraged to move all work to DP6.
The interactive IoT launcher shown at boot now includes an I/O pinout section where you can discover the labels of all the pins. The pin naming used by the i.MX7 has been changed, and you should update your code to use this new naming convention. See the i.MX7 documentation for the complete list of pin names.
New APIs have been added to Android Things that control the configuration of the local device and device updates. UpdateManager gives developers control over when updates and reboots can be performed, ensuring the device is available for the user when needed. DeviceManager controls factory reset, reboot, and device locales. APIs are also provided for settings such as ScreenManager to control the screen, and TimeManager to control the clock and time zone.
We now provide a command-line tool pio that gives developers access to the Peripheral API via the adb shell. Developers can interactively test GPIO, PWM, UART, I2C, SPI, and future interfaces from an adb shell, which is useful for debugging and automated testing.
pio
DP6 includes significant changes and improvements to the platform. Please send us your feedback by filing bug reports and feature requests, as well as asking any questions on Stack Overflow. To start using DP6, use the Android Things Console to download system images and flash existing devices, or use the android-things-setup-utility. More information about the changes are available in the release notes. You can also join Google's IoT Developers Community on Google+, a great resource to get updates and discuss ideas. Also, we have our new hackster.io community, where everyone can share the amazing projects they have built. We look forward to seeing what you build with Android Things!
If you know the basics of building Android apps and want to delve deeper, take a look at our new Advanced Android Development course built by the Google Developers Training team.
Do you want to learn how to use fragments, add widgets for your app, and fine tune your app's performance? Make your app available to a diverse user base through localization and accessibility features? Use sensors in your app? How about creating custom views, drawing directly to the screen and running animations?
Each lesson in our new course takes you through building an app that illustrates an advanced concept, from incorporating maps into your app to using a SurfaceView to draw outside the main UI thread.
This course is intended for experienced Java programmers who already know the fundamentals of building Android apps. It is a follow-on course to our Android Developer Fundamentals course. The course is intended to be taught as instructor-led training. However, all the materials are published online and are available to anyone who wants to learn more advanced concepts of Android development.
We have published detailed written tutorials, concept guides, slide decks, and most importantly, a treasure trove of apps in GitHub. You can find links to everything at developers.google.com/training/android-advanced.
Educational institutions worldwide are invited to use this course to teach your students. Individual developers are welcome (and encouraged) to work through the tutorials to learn on their own.
Each lesson presents a different, advanced topic, and you can teach or learn each topic independently of the others.
Build apps as you learn how to use sensors, add places to your app, and draw directly to a canvas. And much more!
The new course covers:
Learn more at developers.google.com/training/android-advanced.
Starting today we're rolling out an update to the Android 8.1 developer preview, the last before the official launch to consumers in December. Android 8.1 adds targeted enhancements to the Oreo platform, including optimizations for Android Go (for devices with 1GB or less of memory) and a Neural Networks API to accelerate on-device machine intelligence. We've also included a few smaller enhancements to Oreo in response to user and developer feedback.
If you have a device enrolled in the Android Beta Program, you'll receive the update over the next few days. If you haven't enrolled yet, just visit the Android Beta site to enroll and get the update.
At the official release in December we'll bring Android 8.1 to all supported Pixel and Nexus devices worldwide -- including Pixel 2 and Pixel 2 XL, Pixel, Pixel XL, Pixel C, Nexus 5X, and Nexus 6P. Watch for announcements soon.
This preview update includes near-final Android 8.1 system images for Pixel and Nexus devices, with official APIs (API level 27), the latest optimizations and bug fixes, and the November 2017 security patch updates. You can use the images for compatibility testing or to develop using new Android 8.1 features like the Neural Networks API and others.
The Neural Networks API provides accelerated computation and inference for on-device machine learning frameworks like TensorFlow Lite -- Google's cross-platform ML library for mobile -- as well as Caffe2 and others. TensorFlow Lite is now available to developers, so visit the TensorFlow Lite open source repo for downloads and docs. TensorFlow Lite works with the Neural Networks API to run models like MobileNets, Inception v3, and Smart Reply efficiently on your mobile device.
Also, for Pixel 2 users, the Android 8.1 update on these devices enables Pixel Visual Core -- Google's first custom-designed co-processor for image processing and ML -- through a new developer option. Once enabled, apps using Android Camera API can capture HDR+ shots through Pixel Visual Core. See the release notes for details.
With the consumer launch coming in December, it's important to test your current app now. This ensures that users transition seamlessly to Android 8.1 when it arrives on their devices.
Just enroll your eligible device in Android Beta to get the latest update, then install your app from Google Play and test. If you don't have a Pixel or Nexus device, you can set up an Android 8.1 emulator for testing instead. If you notice any issues, fix them and update your app in Google Play right away -- without changing the app's platform targeting.
When you're ready, take advantage of new features and APIs in Android 8.1. See the developer preview site, the API 27 diff report, and the updated API reference for details.
To build with Android 8.1, we recommend updating to Android Studio 3.0, which is now available from the stable channel. On top of the new app performance profiling tools, support for the Kotlin programming language, and Gradle build optimizations, Android Studio 3.0 makes it easier to develop with Android Oreo features like Instant Apps, XML Fonts, downloadable fonts, and adaptive icons.
We also recommend updating to the Android Support Library 27.0.0, which is available from Google's Maven repository. See the version notes for details on what's new.
Google Play is open for apps compiled against or targeting API 27. When you're ready, you can publish your APK updates in your alpha, beta, or production channels.
To make sure your app runs well on Android 8.1 as well as older versions, we recommend using Google Play's beta testing feature to run an alpha test on small group of users. Then run a much open beta test on a much larger group of users. When you're ready to launch your update, you can use a staged rollout in your production channel. We're looking forward to seeing your app updates!
As always, your feedback is crucial, so please keep it coming!. We've set up different hotlists where you can report Android platform issues, app compatibility issues, and third-party SDKs and tools issues. We also have a dedicated hotlist for Neural Networks API issues.
You can also give us feedback through the Android Developer community or Android Beta community as we work towards the consumer release in December.
The release of version 11.6.0 of the Google Play services SDK moves a number of popular APIs to a new paradigm for accessing Google APIs on Android. We have reworked the APIs to reduce boilerplate, improve UX, and simplify authentication and authorization.
The primary change in this release is the introduction of new Task and GoogleApi based APIs to replace the GoogleApiClient access pattern.
Task
GoogleApi
GoogleApiClient
The following APIs are newly updated to eliminate the use of GoogleApiClient:
These APIs join others that made the switch in previous releases, such as the Awareness, Cast, Places, Location, and Wallet APIs.
Here is a simple Activity that demonstrates how one would access the Google Drive API using GoogleApiClient using a previous version of the Play services SDK:
public class MyActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener, GoogleApiClient.ConnectionCallbacks { private static final int RC_SIGN_IN = 9001; private GoogleApiClient mGoogleApiClient; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); GoogleSignInOptions options = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN) .requestScopes(Drive.SCOPE_FILE) .build(); mGoogleApiClient = new GoogleApiClient.Builder(this) .enableAutoManage(this, this) .addConnectionCallbacks(this) .addApi(Auth.GOOGLE_SIGN_IN_API, options) .addApi(Drive.API) .build(); } // ... // Not shown: code to handle sign in flow // ... @Override public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { // GoogleApiClient connection failed, most API calls will not work... } @Override public void onConnected(@Nullable Bundle bundle) { // GoogleApiClient is connected, API calls should succeed... } @Override public void onConnectionSuspended(int i) { // ... } private void createDriveFile() { // If this method is called before "onConnected" then the app will crash, // so the developer has to manage multiple callbacks to make this simple // Drive API call. Drive.DriveApi.newDriveContents(mGoogleApiClient) .setResultCallback(new ResultCallback<DriveApi.DriveContentsResult>() { // ... }); } }
The code is dominated by the concept of a connection, despite using the simplified "automanage" feature. A GoogleApiClient is only connected when all APIs are available and the user has signed in (when APIs require it).
This model has a number of pitfalls:
onConnected
Over the years the need to replace GoogleApiClient became apparent, so we set out to completely abstract the "connection" process and make it easier to access individual Google APIs without boilerplate.
Rather than tacking multiple APIs onto a single API client, each API now has a purpose-built client object class that extends GoogleApi. Unlike with GoogleApiClient there is no performance cost to creating many client objects. Each of these client objects abstracts the connection logic, connections are automatically managed by the SDK in a way that maximizes both speed and efficiency.
When using GoogleApiClient, authentication was part of the "connection" flow. Now that you no longer need to manage connections, you should use the new GoogleSignInClient class to initiate authentication:
GoogleSignInClient
public class MyNewActivity extends AppCompatActivity { private static final int RC_SIGN_IN = 9001; private GoogleSignInClient mSignInClient; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); GoogleSignInOptions options = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN) .requestScopes(Drive.SCOPE_FILE) .build(); mSignInClient = GoogleSignIn.getClient(this, options); } private void signIn() { // Launches the sign in flow, the result is returned in onActivityResult Intent intent = mSignInClient.getSignInIntent(); startActivityForResult(intent, RC_SIGN_IN); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == RC_SIGN_IN) { Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data); if (task.isSuccessful()) { // Sign in succeeded, proceed with account GoogleSignInAccount acct = task.getResult(); } else { // Sign in failed, handle failure and update UI // ... } } } }
Making API calls to authenticated APIs is now much simpler and does not require waiting for multiple callbacks.
private void createDriveFile() { // Get currently signed in account (or null) GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this); // Synchronously check for necessary permissions if (!GoogleSignIn.hasPermissions(account, Drive.SCOPE_FILE)) { // Note: this launches a sign-in flow, however the code to detect // the result of the sign-in flow and retry the API call is not // shown here. GoogleSignIn.requestPermissions(this, RC_DRIVE_PERMS, account, Drive.SCOPE_FILE); return; } DriveResourceClient client = Drive.getDriveResourceClient(this, account); client.createContents() .addOnCompleteListener(new OnCompleteListener<DriveContents>() { @Override public void onComplete(@NonNull Task<DriveContents> task) { // ... } }); }
Before making the API call we add an inline check to make sure that we have signed in and that the sign in process granted the scopes we require.
The call to createContents() is simple, but it's actually taking care of a lot of complex behavior. If the connection to Play services has not yet been established, the call is queued until there is a connection. This is in contrast to the old behavior where calls would fail or crash if made before connecting.
createContents()
In general, the new GoogleApi-based APIs have the following benefits:
GoogleSignInAccount
PendingResult
These new APIs will improve your development process and enable you to make better apps.
Ready to get started with the new Google Play services SDK?
Happy building!
Understanding how people find your app and what they do once they've installed it is crucial to helping you make the right product and marketing decisions. This is especially important when you're deciding your advertising strategy and budget. Today many app measurement companies and ad networks offer ad attribution solutions based on referral data. As such accurate install referral data is vital for correctly attributing app installs, as well as discounting fraudulent attempts for install credit.
To help you obtain more accurate and reliable data about your installs, we're introducing the Google Play Install Referrer API, a reliable way to securely retrieve install referral content. Using this API, your app will get precise information straight from the Play Store, including:
We've tested the API with our App Attribution Program partners including Adjust, AppsFlyer, Singular and TUNE.
- Paul Müller, CTO & Co-Founder, Adjust
"The new Google Play API introduces fresh insights into both mobile ad fraud and the mobile user journey, two key domains with impact across the ecosystem." - Elad Mashiach, VP, AppsFlyer
- Elad Mashiach, VP, AppsFlyer
"This additional data directly from the Play Store provides increased precision for the Kochava fraud suite to further minimize fraud for our customers."
- Charles Manning, CEO, Kochava
"Google's new API is a game changer that will help marketing analytics platforms like Singular identify and prevent a significant portion of Ad Fraud, and provide security and accuracy to mobile advertisers" - Gadi Eliashiv, CEO & Co-Founder, Singular
- Gadi Eliashiv, CEO & Co-Founder, Singular
"This new data from Google Play is essential for marketers who demand accountability out of their mobile app install advertising spend. At TUNE, this data is allowing us to outright eliminate entire forms of mobile app install fraud while providing new insight into how mobile app installs are driven."
– Dan Koch, Chief Technical Officer, TUNE
Starting today, the API works with the Play Store app from version 8.3.73 and later for all developers.
To make it easy to integrate the Install Referrer API, we've released the Install Referrer Library 1.0 for Android. The library is available in our Maven repository. To start using it, add the following dependency to your app module build.gradle file:
dependencies { ... compile 'com.android.installreferrer:installreferrer:1.0' }
All communication with the Play Store app happens through a Service, so the first step is to establish the connection between your app and the Play Store. Also, to receive the connection result and updates it's necessary to implement a listener, InstallReferrerStateListener. This listener could be your current Activity or any other class you want to use:
InstallReferrerStateListener
public class MainActivity extends AppCompatActivity implements InstallReferrerStateListener { … }
Now that you have an InstallReferrerStateListener, you can start binding your app to the Play Store app service. To establish the connection, you must build an InstallReferrerClient instance and call the startConnection() method:
InstallReferrerClient
startConnection()
InstallReferrerClient mReferrerClient ... mReferrerClient = newBuilder(this).build(); mReferrerClient.startConnection(this);
Then, handle the connection result in the onInstallReferrerSetupFinished() method. If the connection is OK, the app can retrieve install referrer information, by calling the getInstallReferrer() method:
onInstallReferrerSetupFinished()
getInstallReferrer()
@Override public void onInstallReferrerSetupFinished(int responseCode) { switch (responseCode) { case InstallReferrerResponse.OK: try { Log.v(TAG, "InstallReferrer conneceted"); ReferrerDetails response = mReferrerClient.getInstallReferrer(); handleReferrer(response); mReferrerClient.endConnection(); } catch (RemoteException e) { e.printStackTrace(); } break; case InstallReferrerResponse.FEATURE_NOT_SUPPORTED: Log.w(TAG, "InstallReferrer not supported"); break; case InstallReferrerResponse.SERVICE_UNAVAILABLE: Log.w(TAG, "Unable to connect to the service"); break; default: Log.w(TAG, "responseCode not found."); } }
For more details about the new API and the client library, visit the Install Referrer Client Library page and the reference documentation.
If you are not able to use our client library, you can use the AIDL interface and establish the connection with Google Play Store on your own. Check out the IGetInstallReferrerService AIDL reference for details of the methods and the service specification.
IGetInstallReferrerService AIDL reference
Check out the Play Install Referrer API documentation for details about the new API, the library's reference docs, and our Quick Start guide.
Back in September, we worked with Hackster.io to encourage the developer community to build smart connected devices using Android Things and post their projects to the Developer Challenge for Android Things. The goal was to showcase the combination of turnkey hardware and a powerful SDK for building and maintaining devices at scale.
Thank you to everyone who participated in the contest and submitted a project or idea. We had over 1100 participants register for the contest, resulting in over 350 submissions. Out of that group, we've chosen three winners. Each winner will receive support and tools from Dragon Innovation to develop their concepts into commercial products. Join us in congratulating the following makers!
Best Enterprise Project: Distributed Air Quality Monitoring
Maker: James Puderer
Monitor air quality on a street-by-street level using Android Things, Google Cloud IoT Core, and taxis!
This project showcases how Android Things makes it easy to build devices that integrate with the various services provided by the Google Cloud Platform for robust data collection and analysis. It's a clever end-to-end solution that shows understanding of both the problem domain as well as the technology.
Best Start Up Project: BrewCentral
Maker: Trent Shumay and Steven Pridie
Brewing amazing beer is a balance of art, science, and ritual. The BrewCentral system makes it possible for anyone to do an all-grain brew!
BrewCentral pairs a real-time PID controller with the touch-enabled UI and decision-making compute power of Android Things. The result is a system that accurately controls the time, temperature, and flow rates necessary to achieve repeatable results during a brew cycle. The planned enhancements for cloud-based brewing recipes will make this a connected experience for the entire brewing community.
Best IoT Project: BrailleBox - Braille News Reader
Maker: Joe Birch
BrailleBox is a small piece of hardware that empowers users who are hard-of-sight to read the latest news articles in Braille.
This project is a great use case of using IoT to have a social impact. The current proof of concept streams articles from a news feed to the Braille pad, but this project has the potential to leverage machine learning on the device to translate additional input from the physical world into a Braille result.
Honorable Mentions
The community submitted some amazing projects for the contest, which made the choice of picking only three winners extremely difficult. Here are a few of our favorite projects that weren't selected for a prize:
We encourage everyone to check out all the new projects in the Google Hackster community, and submit your own as well! You can also join Google's IoT Developers Community on Google+, a great resource to get updates, ask questions, and discuss ideas. We look forward to seeing what exciting projects you build!
Starting in Oreo, Autofill makes it easy for users to provide credit cards, logins, addresses, and other information to apps. Forms in your apps can now be filled automatically, and your users no longer have to remember complicated passwords or type the same bits of information more than once.
Users can choose from multiple Autofill services (similar to keyboards today). By default, we include Autofill with Google, but users can also select any third party Autofill app of their choice. Users can manage this from Settings->System->Languages>Advanced->Autofill service.
Today, Autofill with Google supports filing credit cards, addresses, logins, names, and phone numbers. When logging in or creating an account for the first time, Autofill also allows users to save the new credentials to their account. If you use WebViews in your app, which many apps do for logins and other screens, your users can now also benefit from Autofill support, as long as they have Chrome 61 or later installed.
The Autofill API is open for any developer to implement a service. We are actively working with 1Password, Dashlane, Keeper, and LastPass to help them with their implementations and will be working with other password managers shortly. We are also creating a new curated collection on the Play Store, which the "Add service" button in Settings will link to. If you are a password manager developer and would like us to review your app, please get in touch.
As an app developer, there are a few simple things you can do to take advantage of this new functionality and make sure that it works in your apps:
In many cases, Autofill may work in your app without any effort. But to ensure consistent behavior, we recommend providing explicit hints to tell the framework about the contents of your field. You can do this using either the android:autofillHints attribute or the setAutofillHints() method.
Similarly, with WebViews in your apps, you can use HTML Autocomplete Attributes to provide hints about fields. Autofill will work in WebViews as long as you have Chrome 61 or later installed on your device. Even if your app is using custom views, you can also define the metadata that allows autofill to work.
For views where Autofill does not make sense, such as a Captcha or a message compose box, you can explicitly mark the view as IMPORTANT_FOR_AUTOFILL_NO (or IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS in the root of a view hierarchy). Use this field responsibly, and remember that users can always bypass this by long pressing an EditText and selecting "Autofill" in the overflow menu.
Autofill with Google can seamlessly share logins across websites and mobile apps ‒ passwords saved through Chrome can also be provided to native apps. But in order for this to work, as an app developer, you must explicitly declare the association between your website with your mobile app. This involves 2 steps:
If you've used technologies like App Links or Google Smart Lock before, you might have heard about the Digital Asset Links (DAL) file. It's a JSON file placed under a well known location in your website that lets you make public, verifiable statements about other apps or websites.
You should follow the Smart Lock for Passwords guide for information about how to create and host the DAL file correctly on your server. Even though Smart Lock is a more advanced way of signing users into your app, our Autofill service uses the same infrastructure to verify app-website associations. What's more, because DAL files are public, third-party Autofill service developers can also use the association information to secure their implementations.
Once again, follow the Smart Lock for Passwords guide to do this, under "Declare the association in the Android app."
You'll need to update your app's manifest file with an asset_statements resource, which links to the URL where your assetlinks.json file is hosted. Once that's done, you'll need to submit your updated app to the Play Store, and fill out the Affiliation Submission Form for the association to go live.
When using Android Studio 3.0, the App Links Assistant can generate all of this for you. When you open the DAL generator tool (Tools -> App Links Assistant -> Open Digital Asset Links File Generator), simply make sure you enable the new checkbox labeled "Support sharing credentials between the app and website".
Then, click on "Generate Digital Asset Links file", and copy the preview content to the DAL file hosted on your server and in your app. Please remember to verify that the selected domain names and certificates are correct.
It's still very early days for Autofill in Android. We are continuing to make some major investments going forward to improve the experience, whether you use Autofill with Google or a third party password manager.
Some of our key areas of investment include:
If you encounter any issues or have any suggestions for how we can make this better for you, please send us feedback.
The new Google Pixel 2 ships with a dedicated hardware security module designed to be robust against physical attacks. This hardware module performs lockscreen passcode verification and protects your lock screen better than software alone.
To learn more about the new protections, let's first review the role of the lock screen. Enabling a lock screen protects your data, not just against casual thieves, but also against sophisticated attacks. Many Android devices, including all Pixel phones, use your lockscreen passcode to derive the key that is then used to encrypt your data. Before you unlock your phone for the first time after a reboot, an attacker cannot recover the key (and hence your data) without knowing your passcode first. To protect against brute-force guessing your passcode, devices running Android 7.0+ verify your attempts in a secure environment that limits how often you can repeatedly guess. Only when the secure environment has successfully verified your passcode does it reveal a device and user-specific secret used to derive the disk encryption key.
The goal of these protections is to prevent attackers from decrypting your data without knowing your passcode, but the protections are only as strong as the secure environment that verifies the passcode. Performing these types of security-critical operations in tamper-resistant hardware significantly increases the difficulty of attacking it.
Tamper-resistant hardware comes in the form of a discrete chip separate from the System on a Chip (SoC). It includes its own flash, RAM, and other resources inside a single package, so it can fully control its own execution. It can also detect and defend against outside attempts to physically tamper with it. In particular:
The new Google Pixel 2 ships with a security module built using tamper-resistant hardware that protects your lock screen and your data against many sophisticated hardware attacks.
In addition to all the benefits already mentioned, the security module in Pixel 2 also helps protect you against software-only attacks:
Just like many other Google products, such as Chromebooks and Cloud, Android and Pixel are investing in additional hardware protections to make your device more secure. With the new Google Pixel 2, your data is safer against an entire class of sophisticated hardware attacks.
Posted by Oscar Rodriguez, Partner Developer Advocate
[Note: This blog was amended in March 2018 to include our latest recommendations regarding app integrity verification, in May 2019 to amend the quota increase request form link, and in July 2022 to announce the deprecation of this API.][Note: The SafetyNet Attestation API is now deprecated. This blog post remains for reference, but new and existing developers should use the Play Integrity API instead.]
The SafetyNet Attestation API helps you assess the security and compatibility of the Android environments in which your apps run. Since it was introduced in March 2015, many developers have successfully integrated it into their Android apps to make more informed decisions based on the integrity and compatibility of the devices running their apps.
Throughout the years, the SafetyNet Attestation API has evolved, and its adoption has steadily increased. However, as with any security/anti-abuse related API, there are many common pitfalls that may lead developers into developing unstable systems, or worse, into a false sense of security.
In this post, we provide a list of the most common mistakes we have seen developers make when integrating the SafetyNet Attestation API.
Just like many other Google APIs, the SafetyNet Attestation API requires an API key in order to run. Furthermore, the SafetyNet Attestation API has a per-key usage quota. Although you can get this quota increased, you need to provide your API key to do so.
Getting an API key is easy and free of charge. There is no reason not to get an API key, so if you haven't already, get an API key now.
The SafetyNet Attestation API has evolved throughout its history, and with it, there have been some interface changes. Most recently, with the release of Google Play services 11.0.0, we revamped the entire SafetyNet API to offer an interface that is easier and more streamlined to use: the new API uses SafetyNetClient instead of SafetyNetApi, which is now deprecated, so make sure you update your implementation to use the latest version of the API.
SafetyNetClient
SafetyNetApi
Most devices should have the latest version of Google Play services installed, but if a device doesn't have Google Play services installed, or doesn't have it up to date, using the SafetyNet Attestation API may lead to the app becoming unresponsive or crashing. You can prevent this by checking the installed version of Google Play services before using the API.
The SafetyNet Attestation API lets you set a nonce to uniquely and globally identify each call to the API. Use this feature to prevent a malicious user from reusing a successful attestation result in place of an unsuccessful result (also known as a Replay Attack).
One good way to create a nonce is to create a large (16 bytes or longer) random number on your server using a cryptographically-secure random function. The SafetyNet attestation response includes the nonce you set, so make sure you verify that the returned nonce matches the one you included in the request you made.
SafetyNet can provide useful signals about the state of the device in which your app is running. However, if the logic that acts on these signals is only implemented and enforced directly on the device, an attacker could be able to modify your app and bypass any checks you perform.
To prevent this situation, you should run any logic that verifies the attestation result and enforces any actions based on them on a server that you control and trust.
In order to simplify development and testing of the SafetyNet Attestation API, Google offers an online verification service that checks the digital signature of a SafetyNet Attestation result using a simple HTTPS request.
As useful as this service may seem, it is designed for test purposes only, and it has very strict usage quotas that will not be increased upon request. Instead, you should implement the digital signature verification logic on your server in a way that it doesn't depend on Google's servers. Most JWT libraries offer signature verification functionality, and we have code samples that show how to perform this verification in Java and C#. We plan to provide samples for more languages in the future.
The SafetyNet Attestation API is most widely known for its integrity and compatibility checks, whose results are returned in ctsProfileMatch and basicIntegrity. Although these two values are indeed very useful, you should check the other values in the response, as they contain important information as well.
ctsProfileMatch
basicIntegrity
Use nonce to match a response to its request, as explained above, and use timestampMs to check how much time has passed since you made the request and you got the response. A delayed response that arrives several hours or days after the request may suggest suspicious activity.
nonce
timestampMs
Use apkPackageName to check the name of the APK that made the attestation request, and match apkDigestSha256 and apkCertificateDigestSha256 to those from your app's signed APK in Google Play, to get a signal about the integrity of the installed app.
apkPackageName
apkDigestSha256
apkCertificateDigestSha256
You can also use apkDigestSha256 to check the hash value of the APK installed on the user device. Be aware, however, that distribution channels, such as Google Play may include additional metadata into the APK, so apkDigestSha256 might differ from the hash value of the APK that you uploaded to your distribution channel. In most cases, using apkPackageName and apkCertificateDigestSha256 should be sufficient signals for verifying the integrity of the APK.
Remember that the trustworthiness of the response as a whole is tied to the results of ctsProfileMatch and basicIntegrity. It is not unthinkable for a compromised device that fails basicIntegrity to have forged the rest of the values in the response.
The SafetyNet Attestation API initially provided a single value called basicIntegrity to help developers determine the integrity of a device. As the API evolved, we introduced a new, stricter check whose results appear in a value called ctsProfileMatch, which allows developers to more finely evaluate the devices on which their app is running.
In broad terms, basicIntegrity gives you a signal about the general integrity of the device and its API. Rooted devices fail basicIntegrity, as do emulators, virtual devices, and devices with signs of tampering, such as API hooks.
On the other hand, ctsProfileMatch gives you a much stricter signal about the compatibility of the device. Only unmodified devices that have been certified by Google can pass ctsProfileMatch. Devices that will fail ctsProfileMatch include the following:
The SafetyNet Attestation API gives you a snapshot of the state of a device at the moment when the attestation request was made. A successful attestation doesn't necessarily mean that the device would have passed attestation in the past, or that it will in the future.
Because an attestation is just a spot check, you should plan a sensible strategy for choosing when to make attestation requests. You may choose to require successful attestations before users make in-app purchases, after a certain number of days have passed since the last successful attestation, each time your app is launched, after every reboot, or any other strategy that makes sense for your app.
Keep in mind that an attestation request is computationally expensive, consumes battery and bandwidth, and uses your quota. We recommend you plan a strategy to use the least amount of attestations required to satisfy your use case.
It may be tempting to think that the SafetyNet Attestation API provides all the necessary signals for protecting an app against abusers, and use it as the only signal for building an anti-abuse system.
The SafetyNet Attestation API can only give signals about the state of a device, not the intent of a user, which is what an anti-abuse system should be designed to detect. Therefore, you might want to consider including other signals, such as access logs and behavioral patterns, to more accurately detect abusive users, and consider not blocking users solely on a failed attestation. Furthermore, there are many other conditions that cause an attestation to fail, such as network connection problems, quota issues, and other transient problems.
In other words, not all users who fail attestation are necessarily abusers, and not all abusers will necessarily fail attestation. By blocking users solely on their attestation results, you might be missing abusive users that don't fail attestations. Furthermore, you might also be blocking legitimate, loyal customers who fail attestations for reasons other than abuse.
As mentioned before, the SafetyNet Attestation API is rate limited, and there is a default quota of 10,000 requests per day for each API key. Although this quota might be enough for most development, testing, and initial app launches, your app might reach the default limit as it increases in popularity.
To prevent inadvertently reaching your quota and getting attestation errors, you should build a system that monitors your usage of the API and warns you well before you reach your quota so you can get it increased. You should also be prepared to handle attestation failures because of an exceeded quota and avoid blocking all your users in this situation.
If you are close to reaching your quota, or expect a short-term spike that may lead you to exceed your quota, you can submit this form to request short or long-term increases to the quota for your API key. This process, as well as the additional quota, is free of charge.
Google Play is committed to empowering new and existing voices in gaming. Earlier this year, we hosted the Indie Games Festival and sponsored the Girls Make Games summer camp. We also announced a collaboration between Infinite Deviation and Google Play.
Infinite Deviation is an initiative created by Google Computer Science (CS) in Media and Ideas United in order to tackle issues of representation in computer science. The collaboration between Google Play and Ideas United brought the Infinite Deviation program to gaming, called Infinite Deviation: Games. The program invited game designers from all backgrounds to pitch an original mobile game concept that resonates with underrepresented audiences.
Today we are excited to announce the three teams selected for the Infinite Deviation: Games development program.
A select panel of industry experts reviewed applications and chose the top three ideas. The judging panel included Colleen Macklin (Founder and Co-Director, PETLab), Jeremy Vanhoozer (Senior Creative Director, Plants vs Zombies), Molly Proffitt (CEO, Ker-Chunk Games), Shirin Laor-Raz Salemnia (Founder and CEO, PlayWerks), and Sarah Thomson (Global BD Lead, Indies, Google). These judges scored and delivered personal feedback for each submission, with the three highest scoring games moving into further development.
Here's a closer look at the three games we'll be funding and supporting development over the next six months:
Mo Cohen & Maria Del Castillo Infantas - Queermo Games
Historic Gay Bar Tycoon (name pending) starts you off with a brand new queer bar in the 1920s. This game explores the role bars played in LGBT history. Will your bar survive revolutions, epidemics, and the rise of dating apps?
Queermo Games is pretty much what it sounds like: a scrappy and small indie game developing team just trying to make more LGBT games. Conveniently, they are also next door neighbors. Maria is a queer Latina who handles the art and the music, and Mo is a non-binary Jewish queer who tackles the programming and writing. Together, they also work on another longer-term project called Queer Quest with their buddy Hagen.
Harrison Barton & Morgan Rowe - Pride Interactive
Burn Ban is an interactive visual novel in which you assume the role of Twig, a mentally ill queer girl. After showing destructive tendencies to cope with the death of a close friend, she is sent to Camp Sisquoc, a summer retreat for misguided students. After attending the camp for a few days, her dead friend's online social media page mysteriously starts posting again, and Twig and friends are set with determining the mystery behind the posts.
Pride Interactive is currently made up of two developers, Harrison Barton and Morgan Rowe. Pride Interactive was started as a student game team, and is now continuing on to develop independent projects. Pride Interactive endeavors to further their mission of creating a more diverse environment in the industry through games that deal with serious themes, and diverse character driven narratives.
Adnan Agha, Vivian Allum, and Armand Silvani - Ghost Stories
Ghost in the Graveyard is a story-driven mobile mystery game where you snoop through your missing brother's old phone to try and find him. "Can you find a missing person when all you have is their phone?"
Ghost Stories is a three member team from NYC with a mission to create genuine and unique experiences that connect with players. The team consists of Vivian, the lead designer and programmer, Armand, the artist and writer, and Adnan, the programmer and resident ghost. They've previously published a school project to the Xbox One and are thrilled to be able to work with Infinite Deviation to publish to Google Play.
You can find more information about the program at InfiniteDeviation.com/Games. Congratulations to the three winners and thanks to all the people who have entered the competition for their continuous work to push the boundaries of gaming design and providing a unique voice to the industry.
Posted by Lukas Bergstrom, Product Manager, Android Developer Frameworks Team
Android runs on billions of devices, from high-end phones to airplane seatbacks. The Android OS manages resources aggressively to perform well on this huge range of devices, and sometimes that can make building robust apps complicated. To make it easier, we launched a preview of Architecture Components at Google I/O to provide guidance on app architecture, with libraries for common tasks like lifecycle management and data persistence. Together, these foundational components make it possible to write modular apps with less boilerplate code, so developers can focus on innovating instead of reinventing the wheel - and we hope to keep building on this foundation in the future.
Today we're happy to announce that the Room and Lifecycle Architecture Components libraries have reached 1.0 stable. These APIs are ready for production apps and libraries, and are our recommendation for developers looking for help with app architecture and local storage (although they're only recommended, not required.) Lifecycles are now also integrated with the Support Library, so you can use them with standard classes like AppCompatActivity.
Although we're declaring them stable today, the beta components are already used in apps that together, have billions of installs. Top developers, like Zappos, have been able to spend more time on what's important thanks to Architecture Components:
Prior to the release of Android Architecture Components we had our own ViewModel implementation. We used Loaders and Dependency Injection to persist our ViewModel through config changes. We recently switched to the Architecture Components ViewModel implementation and all that boilerplate went away. We found that we were able to spend more time on design, business logic and testing, and less on writing boilerplate or worrying about Android lifecycle issues.
We've also started to use LiveData which hooks directly into the Activity lifecycle. We use it to retrieve and display network data and no longer have to concern ourselves with network call subscription management.
- David Henry, Android Software Engineer, Zappos
Architecture Components provide a simple, flexible and practical approach that frees developers from some common problems so they can focus on building great experiences. This is based on core building blocks tied together by guidance on app architecture.
Every Android developer has to deal with the operating system starting, stopping and destroying their Activities. That means managing the state of components - such as observables used to update UI - as you move through the lifecycle. Lifecycles enables the creation of lifecycle-aware components that manage their own lifecycles, reducing the possibility of leaks or crashes. The Lifecycle library is the foundation for other Architecture Components like LiveData.
LiveData is a lifecycle-aware observable that holds data and provides updates. Your UI code subscribes to changes and provides LiveData a reference to its Lifecycle. Because LiveData is lifecycle-aware, it provides updates when its Lifecycle is started or resumed, but stops providing updates when the LifecycleOwner is destroyed. LiveData is a simple way to build reactive UIs that are safer and more performant.
ViewModel separates ownership of view data and logic from lifecycle-bound entities like Activities and Fragments. A ViewModel is retained until its associated Activity or Fragment is disposed of forever - that means view data survives events like a Fragment being recreated due to rotation. ViewModels not only eliminate common lifecycle issues, they help build UIs that are more modular and easier to test.
Nearly all apps need to store data locally. While Android has bundled SQLite with the platform since version 1, using it directly can be painful. Room is a simple object-mapping layer that provides the full power of SQlite with less boilerplate. Features like compile-time query verification and built-in migration make it easier to build a robust persistence layer, while integration with LiveData lets Room provide database-backed, lifecycle-aware observables. Room blends of simplicity, power and robustness for managing local storage, and we hope you give it a try.
Last but not least, we created a Guide to App Architecture that provides core principles applicable to all developers, and specific guidance on using Architecture Components together. Because we've heard from you that clear and consistent guidance is important, today we're updating developer documentation to point to Architecture Components where appropriate. We also have a rich set of videos, codelabs and sample apps available at the Architecture Components site, with more to come.
Although the first set of Architecture Components is now stable, we know there's more work to do. Over the last few months, we've listened to your feedback and made improvements. We also recently launched a new Architecture Component, PagedList, to alpha, in response to your feedback that handling large datasets with RecyclerView is too difficult. This is just the beginning - we have more major components under development that we're looking to announce in the upcoming months.
Our hope with Architecture Components is to free developers to focus on providing unique new experiences for mobile devices. We're glad we can finally announce them as stable for production use. We'd like to thank the community, which has given such great feedback along the way, and we look forward to continuing the discussion in the comments of this post. Finally, for those of you who've been waiting for this stable launch, get started today.
Today is the beginning of KotlinConf. It's been almost 6 months since we announced Kotlin as a first-class language for Android at Google I/O. During this period, the number of apps on Google Play using Kotlin has more than doubled. More than 17% of the projects in Android Studio 3.0 are now using Kotlin. We are really excited about the strong momentum, and we are thrilled that Android developers all over the world are discovering the joy of Kotlin programming.
Kotlin for Android is production-ready. From startups to Fortune 500 companies, developers are already using Kotlin to build their apps. Developers from Pinterest, to Expedia, to Basecamp -- and many others -- are finding their use of Kotlin is increasing productivity and their overall developer happiness levels. Take a look at some of their experiences with Kotlin below.
With the recent release of Android Studio 3.0, there is now a stable version of our IDE that has Kotlin support built-in. With Support Library 27, we have started adding nullability annotations to make the APIs friendlier to use in Kotlin. We recently published the Android Kotlin Guides on GitHub to provide some guidance for Android Kotlin style and interop. We have also been porting some of our Android samples to Kotlin, and we are adding Kotlin to our official documentation.
Last week, we released Android Studio 3.0 on the stable channel. This is the first stable release of Android Studio that has Kotlin support built-in. Building on the strength of IntelliJ's Kotlin support, many critical IDE features like code completion and syntax highlighting work well for Kotlin. You can choose to convert Java code to Kotlin by using Code → Convert Java File to Kotlin File, or you can convert snippets of code just by pasting Java code into a Kotlin file.
Project and code templates have also been updated with Kotlin support. When you create a new project or add a new code file, you can choose Kotlin as one of the language options.
The tooling experience with Kotlin is by no means perfect yet. We are aware of several known issues, and we will continue to improve the IDE support for Kotlin in future releases.
There are two separate Android Kotlin Guides:
We intend these guides to be living documents and will evolve them over time. They are hosted on GitHub and we welcome your contributions.
Null-safety is an important feature of the Kotlin language. It helps developers avoid NullPointerExceptions and improves the quality of their apps. Null-safety is a bit more complicated when using Java code from Kotlin. Since any reference in Java may be null, Kotlin's requirement for strict null-safety becomes impractical for Java objects. Types declared in Java that do not contain nullability annotations are called platform types - this means the Kotlin compiler does not know whether it is nullable or not. When calling methods with variables of platform types, the Kotlin compiler relaxes null-safety checks. That means the overall null-safety of your app is weakened.
To let developers take more advantage of Kotlin's strict null-safety, we have started adding nullability annotations in Support Library 27. The Support Library contains a huge API surface area, and we will continue to expand the nullability annotation coverage in the next several releases. In addition, we will also be adding nullability annotations to other Android APIs over time.
While the Kotlin adoption growth is fantastic, our commitment to the Java and C++ programming languages remains unchanged. We've added Java 8 language features support in Android Studio 3.0, and we've added more Java 8 language APIs in Android Oreo. We are also continuing to improve our support for C++17 in the NDK. So even if you are not using Kotlin, your language support will continue to improve.
It's an exciting time to be an Android developer. If you haven't had a chance to try Kotlin, you can get started by learning the basic syntax and by playing with the excellent Kotlin Koans. When you are ready to use Kotlin in your Android app, you can jump to the Android Kotlin page for more resources. With Kotlin's Java interoperability and Android Studio's Java to Kotlin converter, it's easy to start using Kotlin in your project.
Happy Kotlin-ing!
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