Posted by Dave Burke, VP of Engineering
As we speak marks the second chapter of the Android 15 story with the discharge of Android 15 Developer Preview 2!
Android 15 continues our work to construct a platform that helps enhance your productiveness whereas supplying you with new capabilities to provide superior media and AI experiences, reap the benefits of gadget type components, decrease battery affect, maximize clean app efficiency, and defend person privateness and safety, all on probably the most various lineup of gadgets on the market.
Android continues so as to add options enabling your apps to reap the benefits of premium gadget {hardware}, together with the most recent telecommunications options, high-end media capabilities, dazzling shows, foldable/filppable type components, and AI processing.
Your suggestions on the Android 15 Developer Preview and Beta program performs a key position in serving to Android repeatedly enhance. The Android 15 developer website has extra details about the preview, together with downloads for Pixel and detailed documentation about modifications. This preview is only the start, and we’ll have heaps extra to share as we transfer by the discharge cycle. Thanks prematurely in your help make Android a platform that works for everybody.
Updating Android communications
Android 15 updates the platform to offer your app entry to the most recent advances in communication.
Satellite tv for pc assist
Android 15 continues to increase platform assist for satellite tv for pc connectivity and consists of some UI parts to make sure a constant person expertise throughout the satellite tv for pc connectivity panorama.
Apps can use ServiceState.isUsingNonTerrestrialNetwork() to detect when a tool is related to a satellite tv for pc, giving them extra consciousness of why full community companies could also be unavailable. Moreover, Android 15 gives assist for SMS/ MMS functions in addition to preloaded RCS functions to make use of satellite tv for pc connectivity for sending and receiving messages.
Smoother NFC experiences
Android 15 is working to make the faucet to pay expertise extra seamless and dependable whereas persevering with to assist Android’s strong NFC app ecosystem. On supported gadgets, apps can request the NfcAdapter enter observe mode, the place the gadget will pay attention however not reply to NFC readers, sending the app’s NFC service PollingFrame objects to course of. The PollingFrame objects
can be utilized to auth forward of the primary communication to the NFC reader, permitting for a one faucet transaction in lots of circumstances.
Developer productiveness
Whereas most of our work to enhance your productiveness facilities round instruments like Android Studio, Jetpack Compose, and the Android Jetpack libraries, we all the time search for methods within the platform that will help you extra simply notice your imaginative and prescient.
PDF Enhancements
Android 15 Developer Preview 2 consists of an early preview of considerable enhancements to the PdfRenderer APIs, giving apps capabilities to include superior options equivalent to rendering password-protected information, annotations, type enhancing, looking, and choice with copy. Linearized PDF optimizations are supported to hurry native PDF viewing and cut back useful resource use.
The PdfRenderer has been moved to a module that may be up to date utilizing Google Play system updates unbiased of the platform launch, and we’re supporting these modifications again to Android R by making a appropriate pre-Android 15 model of the API floor, referred to as PdfRendererPreV.
We worth your suggestions on the enhancements we have made to the PdfRenderer API floor, and we plan to make it a lot simpler to include these APIs into your app with an upcoming Android Jetpack library. Keep tuned.
Automated language switching refinements
Android 14 added on-device multi-language audio recognition with computerized switching between languages, however this could trigger phrases to get dropped, particularly when languages change with much less of a pause between the 2 utterances. Android 15 has added extra controls to permit apps to assist tune this switching for his or her use case. EXTRA_LANGUAGE_SWITCH_INITIAL_ACTIVE_DURATION_TIME_MILLIS confines the automated switching to the start of the audio session, whereas EXTRA_LANGUAGE_SWITCH_MATCH_SWITCHES deactivates the language switching after an outlined variety of switches. This is usually a helpful refinement, notably if the expectation is that there will probably be a single language spoken throughout the session that ought to be autodetected.
Granular line break controls
Beginning in Android 15, the TextView and the underlying line breaker can protect the given portion of textual content in the identical line to enhance readability. You possibly can reap the benefits of this line break customization through the use of the <nobreak> tag in string assets or createNoBreakSpan. Equally, you may protect phrases from hyphenation through the use of the <nohyphen> tag or createNoHyphenationSpan.
Examples and screenshots:
<assets>
<string title="pixel8pro">The ability and brains behind Pixel 8 Professional.</string>
</assets>
<assets>
<string title="pixel8pro">The ability and brains behind <nobreak>Pixel 8 Professional.</nobreak></string>
</assets>
Expanded IntentFilter Performance
Android 15 builds-in assist for extra exact Intent decision by UriRelativeFilterGroup, which include a set of UriRelativeFilter objects that type a set of Intent matching guidelines that should every be happy, together with URL question parameters, URL fragments, and blocking/exclusion guidelines. This helps functions higher sustain with the dynamic calls for of web-hosted deep hyperlinks.
These guidelines will be outlined within the AndroidManifest with the brand new <uri-relative-filter-group> tag which might optionally embrace an android:enable tag. These tags can include tags that use present information tag attributes in addition to the new android:question and android:fragment attributes.
An instance of the AndroidManifest syntax that will probably be supported:
<intent-filter>
<motion android:title="android.intent.motion.VIEW" />
<class android:title="android.intent.class.BROWSABLE" />
<information android:scheme="http" />
<information android:scheme="https" />
<information android:area="astore.com" />
<uri-relative-filter-group>
<information android:pathPrefix="/auth" />
<information android:question="area=na" />
</uri-relative-filter-group>
<uri-relative-filter-group android:enable="false">
<information android:pathPrefix="/auth" />
<information android:question="mobileoptout=true" />
</uri-relative-filter-group>
<uri-relative-filter-group android:enable="false">
<information android:pathPrefix="/auth" />
<information android:fragmentPrefix="faq" />
</uri-relative-filter-group>
</intent-filter>
Extra OpenJDK API assist
Android 15 continues so as to add OpenJDK APIs. Developer Preview 2 consists of assist for extra math/strictmath strategies, plenty of util updates together with sequenced assortment/map/set, ByteBuffer assist in Deflater, and safety key updates. These APIs are up to date on over a billion gadgets operating Android 12+ by Android 15 by Google Play System updates so you may goal the most recent programming options.
Giving your app extra flexibility on extra screens
Android 15 offers your apps the assist to get probably the most out of Android’s type components, together with massive screens, flippables, and foldables.
Cowl display assist
Your app can declare a property that Android 15 makes use of to permit your Utility or Exercise to be offered on the small cowl screens of supported flippable gadgets. These screens are too small to be thought-about as appropriate targets for Android apps to run on, however your app can opt-in to supporting them, making your app obtainable in additional locations.
A extra personal, safe Android
We’re all the time seeking to give customers extra transparency and management over their information whereas enhancing the core security measures of the platform.
Display screen report detection
Android 15 provides assist for apps to detect that they’re being recorded. A callback is invoked every time the app transitions between being seen or invisible inside a display recording. (An app is taken into account seen if actions owned by the registering course of’s UID are being recorded.) This fashion, in case your app is performing a delicate operation, you may inform the person that they are being recorded.
val mCallback = Client<Int> { state ->
if (state == SCREEN_RECORDING_STATE_VISIBLE) {
// we're being recorded
} else {
// we’re not being recorded
}
}
override enjoyable onStart() {
tremendous.onStart()
val initialState =
windowManager.addScreenRecordingCallback(mainExecutor, mCallback)
mCallback.settle for(initialState)
}
override enjoyable onStop() {
tremendous.onStop()
windowManager.removeScreenRecordingCallback(mCallback)
}
Making Android extra environment friendly
We’re introducing new APIs that may provide help to collect insights about your apps, persevering with to optimize the best way background functions work, and offering APIs to assist make duties in your app extra environment friendly to execute.
ApplicationStartInfo API
App startup on Android has all the time been a little bit of a thriller. There was no straightforward solution to know inside your app whether or not it began from a chilly, heat, or sizzling state. It was tough to know the way lengthy your app spent throughout the numerous launch phases: forking the method, calling onCreate, drawing the primary body, and extra. When your software class was instantiated, you had no manner of understanding whether or not the app began from a broadcast, a content material supplier, a job, a backup, boot full, an alarm, or an Exercise.
The ApplicationStartInfo API on Android 15 offers you all of this and extra. You possibly can even select so as to add your personal timestamps into the move to make it straightforward to gather timing information in a single place. Along with gathering metrics, you should utilize ApplicationStartInfo to assist instantly optimize app startup; for instance, you may get rid of the pricey instantiation of UI-related libraries inside your Utility class when your app is beginning up because of a broadcast.
Modifications to bundle stopped state
Android 15 consists of a number of enhancements to the PackageManager’s Stopped State. Apps which can be in a Stopped State ought to solely be leaving this state by direct person motion. Moreover, apps getting into the Stopped State may have their PendingIntents eliminated. To assist builders re-register their pending intents, apps will now obtain the BOOT_COMPLETED broadcast as soon as they’re faraway from the Stopped State. Lastly, the brand new ApplicationStartInfo may also embrace the ApplicationStartInfo.wasForceStopped() to let builders know that their app was put into the Stopped State.
Detailed app dimension info
Android has provided an API, StorageStats.getAppBytes(), that summarizes the put in dimension of an app as a single variety of bytes, which is a sum of the APK dimension, the scale of information extracted from the APK, and information that had been generated on the gadget equivalent to ahead-of-time (AOT) compiled code. This quantity will not be very insightful when it comes to how your app is utilizing storage.
Android 15 provides the StorageStats.getAppBytesByDataType([type]) API, which lets you get perception into how your app is utilizing up all that house, together with apk file splits, AOT and speedup associated code, dex metadata, libraries, and guided profiles.
Modifications to foreground companies
Android 14 started requiring Foreground Service Varieties. The documentation mentions that the dataSync Foreground Service sort will probably be deprecated in a future model of Android.
To assist migrating away from the dataSync Foreground Service sort, Android 15 consists of the mediaProcessing Foreground Service sort, which is used to carry out time-consuming operations on media property, like changing media to totally different codecs. In a future Beta launch, this service may have a runtime restrict of 6 hours.
SQLite database
Android 15 introduces new SQLite APIs that expose superior options from the underlying SQLite engine that focus on particular efficiency points that may manifest in apps.
Builders ought to seek the advice of finest practices for SQLite efficiency to get probably the most out of their SQLite database, particularly when working with massive databases or when operating latency-sensitive queries.
- Row counts and IDs: new APIs had been added to retrieve the rely of modified rows or the final inserted row ID with out issuing an extra question. getLastChangedRowCount() will return the variety of rows that had been inserted, up to date, or deleted by the latest SQL assertion throughout the present transaction, whereas getTotalChangedRowCount() will return the rely on the present connection. getLastInsertRowId() will return the “rowid” of the final row to be inserted on the present connection.
- Uncooked statements: situation a uncooked SQlite assertion, bypassing comfort wrappers and any extra processing overhead that they could incur.
Media refinements
Every launch of Android focuses on bettering the media expertise.
HDR Headroom Management
Android 15 chooses HDR headroom that’s acceptable for the underlying gadget capabilities and bit-depth of the panel; for pages which have plenty of SDR content material equivalent to a messaging app displaying a single HDR thumbnail, this could find yourself adversely influencing the perceived brightness of the SDR content material. Android 15 means that you can management the HDR headroom with setDesiredHdrHeadroom to strike a steadiness between SDR and HDR content material.
Loudness Management
Android 15 introduces assist for the CTA-2075 loudness normal that will help you keep away from audio loudness inconsistencies and guarantee customers do not must always alter quantity when switching between content material. The system leverages identified traits of the output gadgets (headphones, speaker) together with loudness metadata obtainable in AAC audio content material to intelligently alter the audio loudness and dynamic vary compression ranges.
To allow this function, you could guarantee loudness metadata is offered in your AAC content material and allow the platform function in your app. For this, you instantiate a LoudnessCodecController object by calling its create manufacturing facility technique with the audio session ID from the related AudioTrack; this robotically begins making use of audio updates. You possibly can go an OnLoudnessCodecUpdateListener to switch/filter loudness parameters earlier than they’re utilized on the MediaCodec.
// media incorporates metadata of sort MPEG_4 OR MPEG_D
val mediaCodec = ...
val audioTrack = AudioTrack.Builder()
.setSessionId(sessionId)
.construct()
...
// create new loudness controller that applies the parameters to the MediaCodec
attempt {
val lcController = LoudnessCodecController.create(mSessionId)
// begins making use of audio updates for every added MediaCodec
AndroidX media3 ExoPlayer will quickly be up to date to leverage LoudnessCodecController APIs for a seamless app integration.
Use Spatializer as a substitute of Virtualizer
Android 12 included the Spatializer class, which allows querying the capabilities and habits of sound spatialization on the gadget. In Android 15, we’re deprecating the Virtualizer class; as a substitute use AudioAttributes.Builder.setSpatializationBehavior to characterize the way you need your content material to be performed when spatialization is supported.
AndroidX media3 ExoPlayer 1.0 allows spatial audio by default for multichannel audio when the gadget helps it. See the weblog publish and documentation for extra info, together with APIs to manage the function.
Person Expertise
AutomaticZenRules enable apps to customise Consideration Administration (Do Not Disturb) guidelines and determine when to activate/deactivate them. Android 15 significantly enhances these guidelines with the objective of bettering the person expertise. It does this by:
- Including sorts to AutomaticZenRule, permitting the system to use particular remedy to some guidelines
- Including an icon to AutomaticZenRule, serving to to make the modes be extra recognizable
- Including a triggerDescription string to AutomaticZenRule that describes the circumstances on which the rule ought to change into energetic for the person
- Added ZenDeviceEffects to AutomaticZenRule, permitting guidelines to set off issues like grayscale show, evening mode, or dimming the wallpaper
Habits modifications
As a result of backward compatibility is so essential to us, we attempt to restrict impactful habits modifications, however some are inevitable.
Elegant fonts in all places
As soon as your app targets Android 15, the elegantTextHeight TextView attribute turns into true by default, changing the compact font utilized by default with some scripts which have massive vertical metrics with one that’s way more readable. The compact font was launched to stop breaking layouts; Android 13 prevents many of those breakages by permitting the textual content structure to stretch the vertical peak using the fallbackLineSpacing attribute. In Android 15, the compact font nonetheless stays within the system, so your app can set elegantTextHeight to false to get the identical habits as earlier than, however it’s unlikely to be supported in upcoming releases. So, in case your software helps the next scripts: Arabic, Lao, Myanmar, Tamil, Gujarati, Kannada, Malayalam, Odia, Telugu or Thai, please check your functions by setting elegantTextHeight to true.
Examples and screenshots
Default habits as of Android 14
Default habits for functions that focus on Android 15
App compatibility
To present you extra time to plan for app compatibility work, we’re letting our Platform Stability milestone properly prematurely.
At this milestone, we’ll ship last SDK/NDK APIs and likewise last inner APIs and app-facing system behaviors. We’re anticipating to succeed in Platform Stability in June 2024, and from that point you’ll have a number of months earlier than the official launch to do your last testing. The discharge timeline particulars are right here.
The Developer Preview has all the pieces you could attempt the Android 15 options, check your apps, and provides us suggestions. You may get began immediately by flashing a system picture onto a Pixel 6, 7, or 8 sequence gadget, together with the Pixel Fold and Pixel Pill. We’re not providing sideload photographs for Developer Preview 2. In case you don’t have a Pixel gadget, you may use the 64-bit system photographs with the Android Emulator in Android Studio. In case you’ve already put in Android 15 Developer Preview 1, it’s best to get an over-the-air replace to Android 15 Developer Preview 2.
For the very best growth expertise with Android 15, we suggest that you simply use the newest preview of Android Studio Jellyfish (or newer Jellyfish+ variations). When you’re arrange, listed below are among the issues it’s best to do:
- Strive the brand new options and APIs – your suggestions is important throughout the early a part of the developer preview. Report points in our tracker on the suggestions web page.
- Take a look at your present app for compatibility – be taught whether or not your app is affected by modifications in Android 15; set up your app onto a tool or emulator operating Android 15 and extensively check it.
We’ll replace the preview system photographs and SDK frequently all through the Android 15 launch cycle. This preview launch is for builders solely and never supposed for every day or shopper use, so we’re making it obtainable by guide obtain solely. When you’ve manually put in a preview construct, you’ll robotically get future updates over-the-air for all later previews and Betas. Learn extra right here.
In case you intend to maneuver from the Android 14 QPR Beta program to the Android 15 Developer Preview program and do not wish to must wipe your gadget, we suggest that you simply transfer to Developer Preview 2 now. In any other case you might run into time durations the place the Android 14 Beta may have a newer construct date which can stop you from going on to the Android 15 Developer Preview with out doing a knowledge wipe.
As we attain our Beta releases, we’ll be inviting customers to attempt Android 15 as properly, and we’ll open up enrollment for the Android Beta program at the moment. For now, please observe that the Android Beta program will not be but obtainable for Android 15.
For full info, go to the Android 15 developer website.
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