動作の変更点: Android 16 以上をターゲットとするアプリ

これまでのリリースと同様、Android 16 には、アプリに影響する可能性がある動作変更が含まれています。下記の動作変更は、Android 16 以上をターゲットとするアプリにのみ適用されます。アプリが Android 16 以上をターゲットとする場合は、必要に応じてアプリを変更し、下記の動作に適切に対応できるようにしてください。

アプリの targetSdkVersion に関係なく、Android 16 で実行されるすべてのアプリに影響する動作変更のリストも必ずご確認ください。

ユーザー エクスペリエンスとシステム UI

Android 16 には、より一貫性があり直感的なユーザー エクスペリエンスを実現するための以下の変更が含まれています。

エッジ ツー エッジのオプトアウトの廃止

Android 15 enforced edge-to-edge for apps targeting Android 15 (API level 35), but your app could opt-out by setting R.attr#windowOptOutEdgeToEdgeEnforcement to true. For apps targeting Android 16, R.attr#windowOptOutEdgeToEdgeEnforcement is deprecated and disabled, and your app can't opt-out of going edge-to-edge.

For testing in Android 16 Beta 2, ensure your app supports edge-to-edge and remove any use of R.attr#windowOptOutEdgeToEdgeEnforcement. To support edge-to-edge, see the Compose and Views guidance. Let us know about concerns in our issue tracker on the feedback page.

予測型「戻る」に移行またはオプトアウトが必要

For apps targeting Android 16 or higher and running on an Android 16 or higher device, the predictive back system animations (back-to-home, cross-task, and cross-activity) are enabled by default. Additionally, onBackPressed is not called and KeyEvent.KEYCODE_BACK is not dispatched anymore.

If your app intercepts the back event and you haven't migrated to predictive back yet, update your app to use supported back navigation APIs. or temporarily opt out by setting the android:enableOnBackInvokedCallback attribute to false in the <application> or <activity> tag of your app's AndroidManifest.xml file.

The predictive back-to-home animation.
The predictive cross-activity animation.
The predictive cross-task animation.

Elegant フォント API の非推奨と無効化

Apps targeting Android 15 (API level 35) have the elegantTextHeight TextView attribute set to true by default, replacing the compact font with one that is much more readable. You could override this by setting the elegantTextHeight attribute to false.

Android 16 deprecates the elegantTextHeight attribute, and the attribute will be ignored once your app targets Android 16. The "UI fonts" controlled by these APIs are being discontinued, so you should adapt any layouts to ensure consistent and future proof text rendering in Arabic, Lao, Myanmar, Tamil, Gujarati, Kannada, Malayalam, Odia, Telugu or Thai.

elegantTextHeight behavior for apps targeting Android 14 (API level 34) and lower, or for apps targeting Android 15 (API level 35) that overrided the default by setting the elegantTextHeight attribute to false.
elegantTextHeight behavior for apps targeting Android 16, or for apps targeting Android 15 (API level 35) that didn't override the default by setting the elegantTextHeight attribute to false.

コア機能

Android 16 には、Android システムのさまざまなコア機能を変更または拡張する次の変更が含まれています。

固定レートの勤務スケジュールの最適化

Prior to targeting Android 16, when scheduleAtFixedRate missed a task execution due to being outside a valid process lifecycle, all missed executions immediately execute when the app returns to a valid lifecycle.

When targeting Android 16, at most one missed execution of scheduleAtFixedRate is immediately executed when the app returns to a valid lifecycle. This behavior change is expected to improve app performance. Test this behavior in your app to check if your app is impacted. You can also test by using the app compatibility framework and enabling the STPE_SKIP_MULTIPLE_MISSED_PERIODIC_TASKS compat flag.

デバイスのフォーム ファクタ

Android 16 では、大画面デバイスに表示されるアプリについて、次の変更が加えられています。

アダプティブ レイアウト

With Android apps now running on a variety of devices (such as phones, tablets, foldables, desktops, cars, and TVs) and windowing modes on large screens (such as split screen and desktop windowing), developers should build Android apps that adapt to any screen and window size, regardless of device orientation. Paradigms like restricting orientation and resizability are too restrictive in today's multidevice world.

Ignore orientation, resizability, and aspect ratio restrictions

For apps targeting Android 16, Android 16 includes changes to how the system manages orientation, resizability, and aspect ratio restrictions. On displays with smallest width >= 600dp, the restrictions no longer apply. Apps also fill the entire display window, regardless of aspect ratio or a user's preferred orientation, and pillarboxing isn't used.

This change introduces a new standard platform behavior. Android is moving toward a model where apps are expected to adapt to various orientations, display sizes, and aspect ratios. Restrictions like fixed orientation or limited resizability hinder app adaptability, so we recommend making your app adaptive to deliver the best possible user experience.

You can also test this behavior by using the [app compatibility framework][a16-kilo-14] and enabling the UNIVERSAL_RESIZABLE_BY_DEFAULT compat flag.

Common breaking changes

Ignoring orientation, resizability, and aspect ratio restrictions might impact your app's UI on some devices, especially elements that were designed for small layouts locked in portrait orientation: for example, issues like stretched layouts and off-screen animations and components. Any assumptions about aspect ratio or orientation can cause visual issues with your app. Learn more about how to avoid them and improve your app's adaptive behaviour.

Allowing device rotation results in more activity re-creation, which can result in losing user state if not properly preserved. Learn how to correctly save UI state in Save UI states.

Implementation details

The following manifest attributes and runtime APIs are ignored across large screen devices in full-screen and multi-window modes:

The following values for screenOrientation, setRequestedOrientation(), and getRequestedOrientation() are ignored:

  • portrait
  • reversePortrait
  • sensorPortrait
  • userPortrait
  • landscape
  • reverseLandscape
  • sensorLandscape
  • userLandscape

Regarding display resizability, android:resizeableActivity="false", android:minAspectRatio, and android:maxAspectRatio have no effect.

For apps targeting Android 16, app orientation, resizability, and aspect ratio constraints are ignored on large screens by default, but every app that isn't fully ready can temporarily override this behavior by opting out (which results in the previous behavior of being placed in compatibility mode).

Exceptions

The Android 16 orientation, resizability, and aspect ratio restrictions don't apply in the following situations:

  • Games (based on the android:appCategory flag)
  • Users explicitly opting in to the app's default behavior in aspect ratio settings of the device
  • Screens that are smaller than sw600dp

Opt out temporarily

To opt out a specific activity, declare the PROPERTY_COMPAT_ALLOW_RESTRICTED_RESIZABILITY manifest property:

<activity ...>
  <property android:name="android.window.PROPERTY_COMPAT_ALLOW_RESTRICTED_RESIZABILITY" android:value="true" />
  ...
</activity>

If too many parts of your app aren't ready for Android 16, you can opt out completely by applying the same property at the application level:

<application ...>
  <property android:name="android.window.PROPERTY_COMPAT_ALLOW_RESTRICTED_RESIZABILITY" android:value="true" />
</application>

健康＆フィットネス

Android 16 では、健康とフィットネスのデータに関連する次の変更が加えられています。

健康とフィットネスの権限

Android 16 以降をターゲットとするアプリの場合、BODY_SENSORS 権限は、ヘルスコネクトでも使用される android.permissions.health のきめ細かい権限に移行されます。以前 BODY_SENSORS または BODY_SENSORS_BACKGROUND を必要としていた API には、対応する android.permissions.health 権限が必要になります。これは、次のデータ型、API、フォアグラウンド サービス タイプに影響します。

アプリがこれらの API を使用している場合は、それぞれ詳細な権限をリクエストする必要があります。

これらの権限は、健康、フィットネス、ウェルネス データ用の Android データストアである ヘルスコネクトからのデータの読み取りアクセスを保護する権限と同じです。