功能與 API

Android 16 為開發人員推出了強大的新功能和 API。以下各節會簡要說明這些功能,協助您開始使用相關 API。

如需新增、修改及移除 API 的詳細清單,請參閱 API 差異比較表。如要進一步瞭解新的 API,請參閱 Android API 參考資料 - 新的 API 會醒目顯示,以利於查看。

此外,也請查看平台變更可能對應用程式造成的影響。詳情請參閱下列頁面:

核心功能

Android 包含可擴充 Android 系統核心功能的新 API。

2025 年將發布兩項 Android API

  • This preview is for the next major release of Android with a planned launch in Q2 of 2025. This release is similar to all of our API releases in the past, where we can have planned behavior changes that are often tied to a targetSdkVersion.
  • We're planning the major release a quarter earlier (Q2 rather than Q3 in prior years) to better align with the schedule of device launches across our ecosystem, so more devices can get the major release of Android sooner. With the major release coming in Q2, you'll need to do your annual compatibility testing a few months earlier than in previous years to make sure your apps are ready.
  • We plan to have another release in Q4 of 2025 which also will include new developer APIs. The Q2 major release will be the only release in 2025 to include planned behavior changes that could affect apps.

In addition to new developer APIs, the Q4 minor release will pick up feature updates, optimizations, and bug fixes; it will not include any app-impacting behavior changes.

Timeline view of Android releases in 2025, noting that the 25Q2
       release is a major release and the 25Q4 release is a minor release.

We'll continue to have quarterly Android releases. The Q1 and Q3 updates in-between the API releases will provide incremental updates to help ensure continuous quality. We're actively working with our device partners to bring the Q2 release to as many devices as possible.

Using new APIs with major and minor releases

Guarding a code block with a check for API level is done today using the SDK_INT constant with VERSION_CODES. This will continue to be supported for major Android releases.

if (SDK_INT >= VERSION_CODES.BAKLAVA) {
  // Use APIs introduced in Android 16
}

The new SDK_INT_FULL constant can be used for API checks against both major and minor versions with the new VERSION_CODES_FULL enumeration.

if (SDK_INT_FULL >= VERSION_CODES_FULL.[MAJOR or MINOR RELEASE]) {
  // Use APIs introduced in a major or minor release
}

You can also use the Build.getMinorSdkVersion() method to get just the minor SDK version.

val minorSdkVersion = Build.getMinorSdkVersion(VERSION_CODES_FULL.BAKLAVA)

These APIs have not yet been finalized and are subject to change, so please send us feedback if you have any concerns.

使用者體驗和系統 UI

Android 16 可讓應用程式開發人員和使用者進一步控管及彈性設定裝置,以符合自身需求。

以進度為主的通知

Android 16 推出以進度為主的通知,協助使用者順暢追蹤使用者啟動的端對端歷程。

Notification.ProgressStyle 是一種新的通知樣式,可讓您建立以進度為主的通知。主要用途包括共乘、外送和導航。在 Notification.ProgressStyle 類別中,您可以使用區隔,表示使用者歷程中的狀態和里程碑。

詳情請參閱「以進度為主軸的通知」說明文件。

在螢幕鎖定畫面上顯示以進度為主的通知。
通知欄中顯示以進度為主的通知。

預測返回更新

Android 16 新增了新的 API,可協助您在手勢導覽 (例如返回主畫面動畫) 中啟用預測返回系統動畫。使用新的 PRIORITY_SYSTEM_NAVIGATION_OBSERVER 註冊 onBackInvokedCallback,即可在系統處理返回導覽時讓應用程式接收一般 onBackInvoked 呼叫,且不會影響一般返回導覽流程。

Android 16 也新增了 finishAndRemoveTaskCallback()moveTaskToBackCallback。只要將這些回呼註冊至 OnBackInvokedDispatcher,系統就能在使用者執行返回手勢時觸發特定行為,並播放相應的提前動畫。

更豐富的觸覺回饋

自推出以來,Android 就提供觸覺感應致動器控制項。

Android 11 新增了對更複雜的觸覺效果支援,進階的致動器可透過裝置定義語義原始類型的 VibrationEffect.Compositions 支援此類效果。

Android 16 新增觸覺 API,讓應用程式定義觸覺效果的振幅和頻率曲線,同時抽象化裝置功能之間的差異。

開發人員工作效率和工具

我們致力於提升開發人員的工作效率,因此主要著重於 Android StudioJetpack ComposeAndroid Jetpack 程式庫等工具。此外,我們也持續尋找平台上的各種方法,協助您實現願景。

動態桌布的內容處理方式

在 Android 16 中,動態桌布架構會獲得新的內容 API,以解決動態、使用者導向桌布的挑戰。目前,整合使用者提供內容的動態桌布需要複雜的服務專屬實作項目。Android 16 推出 WallpaperDescriptionWallpaperInstance。您可以使用 WallpaperDescription 識別同一個服務中動態桌布的不同例項。舉例來說,如果桌布同時出現在主畫面和螢幕鎖定畫面,則兩者可能會顯示不同的內容。桌布挑選器和 WallpaperManager 會使用這項中繼資料,為使用者提供更優質的桌布,讓您能以更簡便的方式打造多樣化且個人化的動態桌布體驗。

效能和電池

Android 16 導入的 API 可協助您收集應用程式的深入分析資訊。

系統觸發的剖析

ProfilingManager 已在 Android 15 中新增,讓應用程式能夠在外部公開裝置上使用 Perfetto 要求收集分析資料。不過,由於這項剖析作業必須從應用程式啟動,因此應用程式很難或無法擷取啟動或 ANR 等重要流程。

為協助您完成這項工作,Android 16 為 ProfilingManager 導入系統觸發的剖析功能。應用程式可以註冊對特定觸發事件 (例如冷啟動 reportFullyDrawn 或 ANR) 的追蹤記錄興趣,系統就會代替應用程式啟動及停止追蹤記錄。追蹤記錄完成後,結果會傳送至應用程式的資料目錄。

ApplicationStartInfo 中的啟動元件

ApplicationStartInfo 已在 Android 15 中新增,可讓應用程式查看程序啟動原因、啟動類型、啟動時間、節流和其他實用的診斷資料。Android 16 新增了 getStartComponent(),用於區分觸發啟動的元件類型,這有助於最佳化應用程式的啟動流程。

更深入瞭解工作

JobScheduler#getPendingJobReason() API 會傳回工作可能處於待處理狀態的原因。不過,工作可能會因多種原因而處於待處理狀態。

在 Android 16 中,我們推出了全新的 API JobScheduler#getPendingJobReasons(int jobId),可傳回工作處於待處理狀態的多種原因,包括開發人員設定的明確限制,以及系統設定的隱含限制。

我們也推出 JobScheduler#getPendingJobReasonsHistory(int jobId),可傳回最新約束條件變更的清單。

建議您使用 API 來偵測工作未執行的原因,特別是當您發現特定工作成功率降低,或特定工作完成時間延遲時,就需要進行偵錯。例如,在背景更新小工具時發生錯誤,或是在應用程式啟動前無法呼叫預先擷取工作。

這也能協助您進一步瞭解,某些工作是否因系統定義的限制而無法完成,而非明確設定的限制。

自動調整刷新率

在 Android 15 中推出的適應性重新整理率 (ARR) 可讓支援硬體的螢幕重新整理率,透過獨立的 VSync 步驟調整至內容影格速率。這麼做可降低耗電量,同時避免需要切換模式,進而導致卡頓現象。

Android 16 在還原 getSupportedRefreshRates() 時,會引入 hasArrSupport()getSuggestedFrameRate(int),讓應用程式更容易利用 ARR。RecyclerView 1.4從彈跳或平滑捲動中進行調整時,會在內部支援 ARR,我們也持續致力於將 ARR 支援功能加入更多 Jetpack 程式庫。這篇關於影格速率的文章介紹許多可用來設定影格速率的 API,讓應用程式能直接使用 ARR。

ADPF 中的 Headroom API

The SystemHealthManager introduces the getCpuHeadroom and getGpuHeadroom APIs, designed to provide games and resource-intensive apps with estimates of available CPU and GPU resources. These methods offer a way for you to gauge how your app or game can best improve system health, particularly when used in conjunction with other Android Dynamic Performance Framework (ADPF) APIs that detect thermal throttling.

By using CpuHeadroomParams and GpuHeadroomParams on supported devices, you can customize the time window used to compute the headroom and select between average or minimum resource availability. This can help you reduce your CPU or GPU resource usage accordingly, leading to better user experiences and improved battery life.

無障礙設定

Android 16 新增了無障礙 API 和功能,可協助您為所有使用者提供應用程式。

改良的無障礙 API

Android 16 adds additional APIs to enhance UI semantics that help improve consistency for users that rely on accessibility services, such as TalkBack.

Outline text for maximum text contrast

Users with low vision often have reduced contrast sensitivity, making it challenging to distinguish objects from their backgrounds. To help these users, Android 16 introduces outline text, replacing high contrast text, which draws a larger contrasting area around text to greatly improve legibility.

Android 16 contains new AccessibilityManager APIs to let your apps check or register a listener to see if this mode is enabled. This is primarily for UI Toolkits like Compose to offer a similar visual experience. If you maintain a UI Toolkit library or your app performs custom text rendering that bypasses the android.text.Layout class then you can use this to know when outline text is enabled.

Text with enhanced contrast before and after Android 16's new outline text accessibility feature

Duration added to TtsSpan

Android 16 extends TtsSpan with a TYPE_DURATION, consisting of ARG_HOURS, ARG_MINUTES, and ARG_SECONDS. This lets you directly annotate time duration, ensuring accurate and consistent text-to-speech output with services like TalkBack.

Support elements with multiple labels

Android currently allows UI elements to derive their accessibility label from another, and now offers the ability for multiple labels to be associated, a common scenario in web content. By introducing a list-based API within AccessibilityNodeInfo, Android can directly support these multi-label relationships. As part of this change, we've deprecated AccessibilityNodeInfo#setLabeledBy and #getLabeledBy in favor of #addLabeledBy, #removeLabeledBy, and #getLabeledByList.

Improved support for expandable elements

Android 16 adds accessibility APIs that allow you to convey the expanded or collapsed state of interactive elements, such as menus and expandable lists. By setting the expanded state using setExpandedState and dispatching TYPE_WINDOW_CONTENT_CHANGED AccessibilityEvents with a CONTENT_CHANGE_TYPE_EXPANDED content change type, you can ensure that screen readers like TalkBack announce state changes, providing a more intuitive and inclusive user experience.

Indeterminate ProgressBars

Android 16 adds RANGE_TYPE_INDETERMINATE, giving a way for you to expose RangeInfo for both determinate and indeterminate ProgressBar widgets, allowing services like TalkBack to more consistently provide feedback for progress indicators.

Tri-state CheckBox

The new AccessibilityNodeInfo getChecked and setChecked(int) methods in Android 16 now support a "partially checked" state in addition to "checked" and "unchecked." This replaces the deprecated boolean isChecked and setChecked(boolean).

Supplemental descriptions

When an accessibility service describes a ViewGroup, it combines content labels from its child views. If you provide a contentDescription for the ViewGroup, accessibility services assume you are also overriding the description of non-focusable child views. This can be problematic if you want to label things like a drop-down (for example, "Font Family") while preserving the current selection for accessibility (for example, "Roboto"). Android 16 adds setSupplementalDescription so you can provide text that provides information about a ViewGroup without overriding information from its children.

Required form fields

Android 16 adds setFieldRequired to AccessibilityNodeInfo so apps can tell an accessibility service that input to a form field is required. This is an important scenario for users filling out many types of forms, even things as simple as a required terms and conditions checkbox, helping users to consistently identify and quickly navigate between required fields.

將手機設為 LE Audio 助聽器的語音通話麥克風

Android 16 新增了 LE Audio 助聽器功能,使用者可在助聽器內建麥克風和手機麥克風之間切換,以便進行語音通話。這項功能在吵雜的環境或其他助聽器麥克風效能不佳的情況下特別實用。

控制 LEA 助聽器的環境音量

Android 16 新增了 LE Audio 助聽器功能,可調整助聽器麥克風收錄到的環境音量。在背景噪音過大或過小時,這項功能就非常實用。

相機

Android 16 強化了對專業相機使用者的支援,可進行混合式自動曝光,並精確調整色溫和色調。新的夜間模式指標可協助應用程式瞭解何時該切換至夜間模式攝影工作階段,以及何時該切換回來。新的 Intent 動作可讓您更輕鬆地拍攝動態相片,我們也持續改良 UltraHDR 影像,支援 HEIC 編碼和 ISO 21496-1 草案標準的新參數。

混合式自動曝光

Android 16 在 Camera2 中新增了混合式自動曝光模式,讓您可以手動控制曝光的特定層面,同時讓自動曝光 (AE) 演算法處理其餘部分。您可以控制 ISO + AE曝光時間 + AE,相較於目前必須完全手動控制或完全依賴自動曝光的做法,這項功能提供更大的彈性。

fun setISOPriority() {
    // ... (Your existing code before the snippet) ...

    val availablePriorityModes = mStaticInfo.characteristics.get(
        CameraCharacteristics.CONTROL_AE_AVAILABLE_PRIORITY_MODES
    )

    // ... (Your existing code between the snippets) ...

    // Turn on AE mode to set priority mode
    reqBuilder.set(
        CaptureRequest.CONTROL_AE_MODE,
        CameraMetadata.CONTROL_AE_MODE_ON
    )
    reqBuilder.set(
        CaptureRequest.CONTROL_AE_PRIORITY_MODE,
        CameraMetadata.CONTROL_AE_PRIORITY_MODE_SENSOR_SENSITIVITY_PRIORITY
    )
    reqBuilder.set(
        CaptureRequest.SENSOR_SENSITIVITY,
        TEST_SENSITIVITY_VALUE
    )
    val request: CaptureRequest = reqBuilder.build()

    // ... (Your existing code after the snippet) ...
}

精確調整色溫和色調

Android 16 adds camera support for fine color temperature and tint adjustments to better support professional video recording applications. In previous Android versions, you could control white balance settings through CONTROL_AWB_MODE, which contains options limited to a preset list, such as Incandescent, Cloudy, and Twilight. The COLOR_CORRECTION_MODE_CCT enables the use of COLOR_CORRECTION_COLOR_TEMPERATURE and COLOR_CORRECTION_COLOR_TINT for precise adjustments of white balance based on the correlated color temperature.

fun setCCT() {
    // ... (Your existing code before this point) ...

    val colorTemperatureRange: Range<Int> =
        mStaticInfo.characteristics[CameraCharacteristics.COLOR_CORRECTION_COLOR_TEMPERATURE_RANGE]

    // Set to manual mode to enable CCT mode
    reqBuilder[CaptureRequest.CONTROL_AWB_MODE] = CameraMetadata.CONTROL_AWB_MODE_OFF
    reqBuilder[CaptureRequest.COLOR_CORRECTION_MODE] = CameraMetadata.COLOR_CORRECTION_MODE_CCT
    reqBuilder[CaptureRequest.COLOR_CORRECTION_COLOR_TEMPERATURE] = 5000
    reqBuilder[CaptureRequest.COLOR_CORRECTION_COLOR_TINT] = 30

    val request: CaptureRequest = reqBuilder.build()

    // ... (Your existing code after this point) ...
}

The following examples show how a photo would look after applying different color temperature and tint adjustments:

The original image with no color temperature or tint adjustments applied.
The image with color temperature adjusted to 3000.
The image with color temperature adjusted to 7000.


The image with tint levels lowered by 50.
The image with tint levels raised by 50.

相機夜間模式場景偵測

To help your app know when to switch to and from a night mode camera session, Android 16 adds EXTENSION_NIGHT_MODE_INDICATOR. If supported, it's available in the CaptureResult within Camera2.

This is the API we briefly mentioned as coming soon in the How Instagram enabled users to take stunning low light photos blog post. That post is a practical guide on how to implement night mode together with a case study that links higher-quality in-app night mode photos with an increase in the number of photos shared from the in-app camera.

動態相片拍攝意圖動作

Android 16 adds standard Intent actions — ACTION_MOTION_PHOTO_CAPTURE, and ACTION_MOTION_PHOTO_CAPTURE_SECURE — which request that the camera application capture a motion photo and return it.

You must either pass an extra EXTRA_OUTPUT to control where the image will be written, or a Uri through Intent.setClipData(ClipData). If you don't set a ClipData, it will be copied there for you when calling Context.startActivity(Intent).

An example of a motion photo, showing the still image followed by the motion playback.

UltraHDR 圖片強化

標準動態範圍 (SDR) 與高動態範圍 (HDR) 圖片品質的比較圖。

Android 16 持續致力於透過 UltraHDR 圖片提供令人驚豔的圖像品質。新增對 HEIC 檔案格式中的 UltraHDR 圖片支援。這些圖片會取得 ImageFormat 類型的 HEIC_ULTRAHDR,並包含類似現有 UltraHDR JPEG 格式的內嵌增益圖。我們也正在努力讓 AVIF 支援 UltraHDR,敬請期待。

此外,Android 16 會根據 ISO 21496-1 草稿標準,在 UltraHDR 中實作其他參數,包括取得及設定應套用的增益圖數值空間,以及支援 HDR 編碼的基礎圖片,並使用 SDR 增益圖。

圖形

Android 16 包含最新的圖像改善功能,例如使用 AGSL 的自訂圖像效果。

使用 AGSL 自訂圖像效果

Android 16 新增了 RuntimeColorFilterRuntimeXfermode,讓您可以製作複雜的效果 (例如閾值、棕褐色和色調飽和度),並套用至繪圖呼叫。自 Android 13 起,您可以使用 AGSL 建立可擴充 Shader 的自訂 RuntimeShaders。新的 API 會反映這項情況,新增由 AGSL 提供動力的 RuntimeColorFilter,可擴充 ColorFilter,以及 Xfermode 效果,讓您在來源和目的地像素之間實作以 AGSL 為基礎的自訂合成和混合效果。

private val thresholdEffectString = """
    uniform half threshold;

    half4 main(half4 c) {
        half luminosity = dot(c.rgb, half3(0.2126, 0.7152, 0.0722));
        half bw = step(threshold, luminosity);
        return bw.xxx1 * c.a;
    }"""

fun setCustomColorFilter(paint: Paint) {
   val filter = RuntimeColorFilter(thresholdEffectString)
   filter.setFloatUniform(0.5);
   paint.colorFilter = filter
}

連線能力

Android 16 會更新平台,讓應用程式使用通訊和無線技術的最新進展。

採用強化安全性的測距功能

Android 16 新增了對 Wi-Fi 6 的 802.11az 支援裝置 Wi-Fi 位置資訊的強大安全性功能支援,讓應用程式可結合更高的精確度、更大的可擴充性和動態排程的通訊協定,以及 AES-256 加密和防範中間人攻擊的安全性強化功能。這可讓使用者在近距離用途 (例如解鎖筆電或車門) 時,更安全地使用這項功能。802.11az 已整合 Wi-Fi 6 標準,可利用其基礎架構和功能,讓採用率更廣泛,部署作業也更輕鬆。

一般測距 API

Android 16 包含新的 RangingManager,可用於判斷本機裝置與遠端裝置之間的距離和角度,前提是裝置支援硬體。RangingManager 支援各種測距技術,例如 BLE 通道測試、BLE RSSI 測距、超寬頻和 Wi-Fi 往返時間。

隨附裝置管理工具裝置狀態

在 Android 16 中,我們推出了新的 API,用於繫結隨附應用程式服務。當 BLE 在範圍內且已連上藍牙時,服務就會繫結;當 BLE 超出範圍或藍牙已中斷連線時,服務就會解除繫結。應用程式會根據各種 DevicePresenceEvent 接收新的 'onDevicePresenceEvent()' 回呼。如需更多詳細資訊,請參閱「startObservingDevicePresence(ObservingDevicePresenceRequest)」一文。

媒體

Android 16 包含多項功能,可提升媒體體驗。

相片挑選工具改良功能

The photo picker provides a safe, built-in way for users to grant your app access to selected images and videos from both local and cloud storage, instead of their entire media library. Using a combination of Modular System Components through Google System Updates and Google Play services, it's supported back to Android 4.4 (API level 19). Integration requires just a few lines of code with the associated Android Jetpack library.

Android 16 includes the following improvements to the photo picker:

  • Embedded photo picker: New APIs that enable apps to embed the photo picker into their view hierarchy. This allows it to feel like a more integrated part of the app while still leveraging the process isolation that allows users to select media without the app needing overly broad permissions. To maximize compatibility across platform versions and simplify your integration, you'll want to use the forthcoming Android Jetpack library if you want to integrate the embedded photo picker.
  • Cloud search in photo picker: New APIs that enable searching from the cloud media provider for the Android photo picker. Search functionality in the photo picker is coming soon.

進階專業影片

Android 16 推出了對進階專業影片 (APV) 轉碼器的支援,該轉碼器專為專業級高品質影片錄製和後製作業而設計。

APV 編碼器標準具有下列功能:

  • 感知上無損的影片品質 (接近原始影片品質)
  • 低複雜度和高吞吐量的單一影格編碼 (不含像素網域預測),以便更妥善支援編輯工作流程
  • 支援高位元速率範圍 (最高可達數 Gbps),適用於 2K、4K 和 8K 解析度的內容,可透過輕量化熵值編碼方案啟用
  • 為沉浸式內容和啟用平行編碼/解碼作業的框架平鋪作業
  • 支援各種色度取樣格式和位元深度
  • 支援多重解碼和重新編碼,且不會嚴重降低視覺品質
  • 支援多視角影片和輔助影片,例如深度、alpha 和預覽
  • 支援 HDR10/10+ 和使用者定義的中繼資料

OpenAPV 專案提供 APV 的參考實作項目。Android 16 將實作支援 APV 422-10 設定檔,提供 YUV 422 色彩取樣功能,以及 10 位元編碼和最高 2 Gbps 的目標位元率。

隱私權

Android 16 包含多項功能,可協助應用程式開發人員保護使用者隱私權。

健康資料同步更新

Health Connect 新增了 ACTIVITY_INTENSITY,這是根據世界衛生組織針對中度和劇烈活動制定的規範所定義的資料類型。每個記錄都需要開始時間、結束時間,以及活動強度是屬於中等或劇烈。

Health Connect 也包含支援醫療記錄的更新版 API。這樣一來,應用程式就能在取得使用者的明確同意後,以 FHIR 格式讀取及寫入醫療記錄。

Android 版 Privacy Sandbox

Android 16 整合了最新版本的 Android 版 Privacy Sandbox,這是我們持續開發技術的一部分,讓使用者知道自己的隱私權受到保護。網站提供更多 Android 版 Privacy Sandbox 開發人員 Beta 版計畫的相關資訊,協助您開始使用。請查看 SDK 執行階段,讓 SDK 在專屬的執行階段環境中執行,而非在服務的應用程式中執行,以便在收集和分享使用者資料時提供更完善的防護。

安全性

Android 16 包含多項功能,可協助您提升應用程式安全性及保護應用程式資料。

金鑰共用 API

Android 16 新增了 API,可支援與其他應用程式共用 Android KeyStore 金鑰的存取權。新的 KeyStoreManager 類別支援應用程式 uid 授予撤銷金鑰存取權,並包含可讓應用程式存取共用金鑰的 API。

裝置板型規格

Android 16 可讓應用程式充分運用 Android 的板型規格。

電視的標準化影像和音訊品質架構

Android 16 中的新 MediaQuality 套件公開一組標準化 API,可存取音訊和相片設定檔,以及硬體相關設定。這可讓串流應用程式查詢設定檔,並動態套用至媒體:

  • 採用更廣動態範圍進行調色的電影,需要更高色彩準確度,才能看見陰影中的細微細節,並調整環境光線,因此適合使用偏好色彩準確度而非亮度的設定檔。
  • 體育賽事直播通常會以較窄的動態範圍進行調色,但觀眾通常會在日間觀看,因此如果設定檔將亮度優先於色彩準確度,就能獲得更好的效果。
  • 完全互動式內容需要盡可能減少處理作業以縮短延遲時間,並需要更高的影格速率,這也是許多電視機上會提供遊戲設定檔的原因。

這個 API 可讓應用程式切換設定檔,使用者也能根據內容調整支援的電視。

國際化

Android 16 新增多項功能,可提升使用者在不同語言環境下的裝置使用體驗。

直書文字

Android 16 adds low-level support for rendering and measuring text vertically to provide foundational vertical writing support for library developers. This is particularly useful for languages like Japanese that commonly use vertical writing systems. A new flag, VERTICAL_TEXT_FLAG, has been added to the Paint class. When this flag is set using Paint.setFlags, Paint's text measurement APIs will report vertical advances instead of horizontal advances, and Canvas will draw text vertically.

val text = "「春は、曙。」"
Box(
    Modifier.padding(innerPadding).background(Color.White).fillMaxSize().drawWithContent {
        drawIntoCanvas { canvas ->
            val paint = Paint().apply { textSize = 64.sp.toPx() }
            // Draw text vertically
            paint.flags = paint.flags or VERTICAL_TEXT_FLAG
            val height = paint.measureText(text)
            canvas.nativeCanvas.drawText(
                text,
                0,
                text.length,
                size.width / 2,
                (size.height - height) / 2,
                paint
            )
        }
    }
) {}

自訂計量系統

Users can now customize their measurement system in regional preferences within Settings. The user preference is included as part of the locale code, so you can register a BroadcastReceiver on ACTION_LOCALE_CHANGED to handle locale configuration changes when regional preferences change.

Using formatters can help match the local experience. For example, "0.5 in" in English (United States), is "12,7 mm" for a user who has set their phone to English (Denmark) or who uses their phone in English (United States) with the metric system as the measurement system preference.

To find these settings, open the Settings app and navigate to System > Languages & region.