功能和 API

Android 17 面向开发者引入了一些出色的新功能和 API。以下各部分总结了这些功能，可帮助您开始使用相关 API。

如需查看新增、修改和移除的 API 的详细列表，请参阅 API 差异报告。如需详细了解新的 API，请访问 Android API 参考文档，新 API 会突出显示以方便查看。

您还应查看平台变更可能会在哪些方面影响您的应用。如需了解详情，请参阅以下页面：

核心功能

Android 17 添加了以下与核心 Android 功能相关的新功能。

新的 ProfilingManager 触发器

Android 17 向 ProfilingManager 添加了多个新的系统触发器，以帮助您收集深入数据来调试性能问题。

新触发器包括：

TRIGGER_TYPE_COLD_START：在应用冷启动期间触发。它在响应中同时提供调用堆栈样本和系统跟踪记录。
TRIGGER_TYPE_OOM：当应用抛出 OutOfMemoryError时触发，并在响应中提供 Java 堆转储。
TRIGGER_TYPE_KILL_EXCESSIVE_CPU_USAGE：当应用因 CPU 使用异常且过高而被终止时触发，并在响应中提供调用堆栈样本。
TRIGGER_TYPE_ANOMALY：检测系统性能异常，例如 binder 调用过多和内存用量过高。

如需了解如何设置系统触发器，请参阅有关基于触发器的性能分析的文档以及有关如何检索和分析性能分析数据的文档。

应用异常的性能分析触发器

Android 17 引入了一项设备端异常检测服务，用于监控资源密集型行为和潜在的兼容性回归。此服务与ProfilingManager集成，可让您的应用接收由特定系统检测到的事件触发的性能分析工件。

使用 TRIGGER_TYPE_ANOMALY 触发器检测系统性能问题例如 binder 调用过多和内存用量过高。当应用违反操作系统定义的内存限制时，异常触发器允许开发者接收特定于应用的堆转储，以帮助识别和修复内存问题。此外，对于 binder 垃圾内容过多，异常触发器会提供有关 binder 事务的堆栈抽样分析报告。

此 API 回调发生在系统强制执行任何操作之前。例如，它可以帮助开发者在应用因超出内存限制而被系统终止之前收集调试数据。

val profilingManager =
    applicationContext.getSystemService(ProfilingManager::class.java)
val triggers = ArrayList<ProfilingTrigger>()
triggers.add(ProfilingTrigger.Builder(ProfilingTrigger.TRIGGER_TYPE_ANOMALY))
val mainExecutor: Executor = Executors.newSingleThreadExecutor()
val resultCallback = Consumer<ProfilingResult> { profilingResult ->
    if (profilingResult.errorCode != ProfilingResult.ERROR_NONE) {
        // upload profile result to server for further analysis
        setupProfileUploadWorker(profilingResult.resultFilePath)
    }
    profilingManager.registerForAllProfilingResults(mainExecutor,
                                                    resultCallback)
    profilingManager.addProfilingTriggers(triggers)
}

JobDebugInfo API

Android 17 introduces new JobDebugInfo APIs to help developers debug their JobScheduler jobs--why they aren't running, how long they ran for, and other aggregated information.

The first method of the expanded JobDebugInfo APIs is getPendingJobReasonStats(), which returns a map of reasons why the job was in a pending execution state and their respective cumulative pending durations. This method joins the getPendingJobReasonsHistory() and getPendingJobReasons() methods to give you insight into why a scheduled job is not running as expected, but simplifies information retrieval by making both duration and job reason available in a single method.

For example, for a specified jobId, the method might return PENDING_JOB_REASON_CONSTRAINT_CHARGING and a duration of 60000 ms, indicating the job was pending for 60000ms due to the charging constraint not being satisfied.

通过为允许空闲时运行的闹钟提供监听器支持，减少唤醒锁定

Android 17 introduces a new variant of AlarmManager.setExactAndAllowWhileIdle that accepts an OnAlarmListener instead of a PendingIntent. This new callback-based mechanism is ideal for apps that currently rely on continuous wakelocks to perform periodic tasks, such as messaging apps maintaining socket connections.

隐私权

Android 17 包含以下新功能，可提升用户隐私保护。

加密客户端 Hello (ECH) 平台支持

Android 17 引入了对加密客户端 Hello (ECH) 的平台支持，这是对网络通信的一项重大隐私增强功能。ECH 是一项 TLS 1.3 扩展，可在初始 TLS 握手期间加密服务器名称指示 (SNI)。这种加密有助于保护用户隐私，因为它可以让网络中介更难识别应用连接到的特定网域。

该平台现在包含网络库实现 ECH 所需的 API。这包括 DnsResolver 中的新功能，用于查询包含 ECH 配置的 HTTPS DNS 记录；以及 Conscrypt 的 SSLEngine 和 SSLSocket 中的新方法，用于在连接到网域时传入这些配置来启用 ECH。开发者可以通过网络安全配置文件中的新 <domainEncryption> 元素来配置 ECH 偏好设置，例如机会性地启用 ECH 或强制使用 ECH，这些设置可全局应用，也可按网域应用。

预计 HttpEngine、WebView 和 OkHttp 等热门联网库将在未来的更新中集成这些平台 API，从而使应用能够更轻松地采用 ECH 并增强用户隐私保护。

如需了解详情，请参阅加密的客户端 Hello 文档。

Android 联系人选择器

Android 联系人选择工具是一个标准化的可浏览界面，供用户与您的应用分享联系人。该选择工具适用于搭载 Android 17（API 级别 37）或更高版本的设备，可提供一种可保护隐私的替代方案，以取代广泛的 READ_CONTACTS 权限。您的应用无需请求访问用户的整个地址簿，而是指定所需的数据字段（例如电话号码或电子邮件地址），然后用户选择要分享的特定联系人。这样，您的应用便只能读取所选数据，从而确保精细控制，同时提供一致的用户体验，并具有内置搜索、个人资料切换和多选功能，而无需构建或维护界面。

如需了解详情，请参阅联系人选择工具文档。

安全

Android 17 添加了以下新功能，以提升设备和应用安全性。

Android 高级保护模式 (AAPM)

Android Advanced Protection Mode offers Android users a powerful new set of security features, marking a significant step in safeguarding users—particularly those at higher risk—from sophisticated attacks. Designed as an opt-in feature, AAPM is activated with a single configuration setting that users can turn on at any time to apply an opinionated set of security protections.

These core configurations include blocking app installation from unknown sources (sideloading), restricting USB data signaling, and mandating Google Play Protect scanning, which significantly reduces the device's attack surface area. Developers can integrate with this feature using the AdvancedProtectionManager API to detect the mode's status, enabling applications to automatically adopt a hardened security posture or restrict high-risk functionality when a user has opted in.

PQC APK 签名

Android now supports a hybrid APK signature scheme to future-proof your app's signing identity against the potential threat of attacks that make use of quantum computing. This feature introduces a new APK Signature Scheme, which lets you pair a classical signing key (such as RSA or EC) with a new post-quantum cryptography (PQC) algorithm (ML-DSA).

This hybrid approach ensures your app remains secure against future quantum attacks while maintaining full backward compatibility with older Android versions and devices that rely on classical signature verification.

Impact on developers

Apps using Play App Signing: If you use Play App Signing, you can wait for Google Play to give you the option to upgrade a hybrid signature using a PQC key generated by Google Play, ensuring your app is protected without requiring manual key management.
Apps using self-managed keys: Developers who manage their own signing keys can utilize updated Android build tools (like apksigner) to rotate to a hybrid identity, combining a PQC key with a new classical key. (You must create a new classical key, you cannot reuse the older one.)

连接

Android 17 添加了以下功能，以改进设备和应用连接。

受限卫星网络

Implements optimizations to enable apps to function effectively over low-bandwidth satellite networks.

用户体验和系统界面

Android 17 包含以下变更，旨在提升用户体验。

专用 Google 助理音量音频流

Android 17 introduces a dedicated Assistant volume stream for Assistant apps, for playback with USAGE_ASSISTANT. This change decouples Assistant audio from the standard media stream, providing users with isolated control over both volumes. This enables scenarios such as muting media playback while maintaining audibility for Assistant responses, and the other way around.

Assistant apps with access to the new MODE_ASSISTANT_CONVERSATION audio mode can further improve the volume control consistency. Assistant apps can use this mode to provide a hint to the system about an active Assistant session, ensuring the Assistant stream can be controlled outside of the active USAGE_ASSISTANT playback or with connected Bluetooth peripherals.

Handoff

切换是 Android 17 中新增的一项功能和 API，应用开发者可以将其集成到应用中，以便为用户提供跨设备连续性。它允许用户在一个 Android 设备上启动应用 activity，然后将其转移到另一个 Android 设备。Handoff 在用户设备的后台运行，并通过各种入口点（例如接收设备上的启动器和任务栏）显示用户附近其他设备上的可用活动。

应用可以指定 Handoff 来启动相同的原生 Android 应用（如果该应用已安装在接收设备上且可供使用）。在此应用到应用流程中，用户通过深层链接跳转到指定 activity。或者，应用到网站切换功能可以作为后备选项提供，也可以通过网址切换功能直接实现。

切换支持是按 activity 实现的。如需启用 Handoff，请针对 activity 调用 setHandoffEnabled() 方法。可能需要随切换传递其他数据，以便接收设备上重新创建的 activity 可以恢复适当的状态。实现 onHandoffActivityDataRequested() 回调以返回 HandoffActivityData 对象，该对象包含用于指定 Handoff 应如何处理并在接收设备上重新创建 activity 的详细信息。

实时更新 - 语义颜色 API

With Android 17, Live Update launches the Semantic Coloring APIs to support colors with universal meaning.

The following classes support semantic coloring:

Coloring

Green: Associated with safety. This color should be used for the case where it lets people know you are in the safe situation.
Orange: For designating caution and marking physical hazards. This color should be used in the situation where users need to pay attention to set better protection setting.
Red: Generally indicates danger, stop. It should be presented for the case where need people's attention urgently.
Blue: Neutral color for content that is informational and should stand out from other content.

The following example shows how to apply semantic styles to text in a notification:

  val ssb = SpannableStringBuilder()
        .append("Colors: ")
        .append("NONE", Notification.createSemanticStyleAnnotation(SEMANTIC_STYLE_UNSPECIFIED), 0)
        .append(", ")
        .append("INFO", Notification.createSemanticStyleAnnotation(SEMANTIC_STYLE_INFO), 0)
        .append(", ")
        .append("SAFE", Notification.createSemanticStyleAnnotation(SEMANTIC_STYLE_SAFE), 0)
        .append(", ")
        .append("CAUTION", Notification.createSemanticStyleAnnotation(SEMANTIC_STYLE_CAUTION), 0)
        .append(", ")
        .append("DANGER", Notification.createSemanticStyleAnnotation(SEMANTIC_STYLE_DANGER), 0)

    Notification.Builder(context, channelId)
          .setSmallIcon(R.drawable.ic_icon)
          .setContentTitle("Hello World!")
          .setContentText(ssb)
          .setOngoing(true)
              .setRequestPromotedOngoing(true)

适用于 Android 17 的 UWB 下行链路 TDoA API

Downlink Time Difference of Arrival (DL-TDoA) ranging lets a device determine its position relative to multiple anchors by measuring the relative arrival times of signals.

The following snippet demonstrates how to initialize the Ranging Manager, verify device capabilities, and start a DL-TDoA session:

Kotlin

class RangingApp {

    fun initDlTdoa(context: Context) {
        // Initialize the Ranging Manager
        val rangingManager = context.getSystemService(RangingManager::class.java)

        // Register for device capabilities
        val capabilitiesCallback = object : RangingManager.RangingCapabilitiesCallback {
            override fun onRangingCapabilities(capabilities: RangingCapabilities) {
                // Make sure Dl-TDoA is supported before starting the session
                if (capabilities.uwbCapabilities != null && capabilities.uwbCapabilities!!.isDlTdoaSupported) {
                    startDlTDoASession(context)
                }
            }
        }
        rangingManager.registerCapabilitiesCallback(Executors.newSingleThreadExecutor(), capabilitiesCallback)
    }

    fun startDlTDoASession(context: Context) {

        // Initialize the Ranging Manager
        val rangingManager = context.getSystemService(RangingManager::class.java)

        // Create session and configure parameters
        val executor = Executors.newSingleThreadExecutor()
        val rangingSession = rangingManager.createRangingSession(executor, RangingSessionCallback())
        val rangingRoundIndexes = byteArrayOf(0)
        val config: ByteArray = byteArrayOf() // OOB config data
        val params = DlTdoaRangingParams.createFromFiraConfigPacket(config, rangingRoundIndexes)

        val rangingDevice = RangingDevice.Builder().build()
        val rawTagDevice = RawRangingDevice.Builder()
            .setRangingDevice(rangingDevice)
            .setDlTdoaRangingParams(params)
            .build()

        val dtTagConfig = RawDtTagRangingConfig.Builder(rawTagDevice).build()

        val preference = RangingPreference.Builder(DEVICE_ROLE_DT_TAG, dtTagConfig)
            .setSessionConfig(SessionConfig.Builder().build())
            .build()

        // Start the ranging session
        rangingSession.start(preference)
    }
}

private class RangingSessionCallback : RangingSession.Callback {
    override fun onDlTdoaResults(peer: RangingDevice, measurement: DlTdoaMeasurement) {
        // Process measurement results here
    }
}

Java

public class RangingApp {

    public void initDlTdoa(Context context) {

        // Initialize the Ranging Manager
        RangingManager rangingManager = context.getSystemService(RangingManager.class);

        // Register for device capabilities
        RangingManager.CapabilitiesCallback capabilitiesCallback = new RangingManager.RangingCapabilitiesCallback() {
            @Override
            public void onRangingCapabilities(RangingCapabilities capabilities) {
                // Make sure Dl-TDoA is supported before starting the session
                if (capabilities.getUwbCapabilities() != null && capabilities.getUwbCapabilities().isDlTdoaSupported()) {
                    startDlTDoASession(context);
                }
            }
        };
        rangingManager.registerCapabilitiesCallback(Executors.newSingleThreadExecutor(), capabilitiesCallback);
    }

    public void startDlTDoASession(Context context) {
        RangingManager rangingManager = context.getSystemService(RangingManager.class);

        // Create session and configure parameters
        Executor executor = Executors.newSingleThreadExecutor();
        RangingSession rangingSession = rangingManager.createRangingSession(executor, new RangingSessionCallback());
        byte[] rangingRoundIndexes = new byte[] {0};
        byte[] config = new byte[0]; // OOB config data
        DlTdoaRangingParams params = DlTdoaRangingParams.createFromFiraConfigPacket(config, rangingRoundIndexes);

        RangingDevice rangingDevice = new RangingDevice.Builder().build();
        RawRangingDevice rawTagDevice = new RawRangingDevice.Builder()
                .setRangingDevice(rangingDevice)
                .setDlTdoaRangingParams(params)
                .build();

        RawDtTagRangingConfig dtTagConfig = new RawDtTagRangingConfig.Builder(rawTagDevice).build();

        RangingPreference preference = new RangingPreference.Builder(DEVICE_ROLE_DT_TAG, dtTagConfig)
                .setSessionConfig(new SessionConfig.Builder().build())
                .build();

        // Start the ranging session
        rangingSession.start(preference);
    }

    private static class RangingSessionCallback implements RangingSession.Callback {

        @Override
        public void onDlTdoaResults(RangingDevice peer, DlTdoaMeasurement measurement) {
            // Process measurement results here
        }
    }
}

Out-of-Band (OOB) Configurations

The following snippet provides an example of DL-TDoA OOB configuration data for Wi-Fi and BLE:

Java

// Wifi Configuration
byte[] wifiConfig = {
    (byte) 0xDD, (byte) 0x2D, (byte) 0x5A, (byte) 0x18, (byte) 0xFF, // Header
    (byte) 0x5F, (byte) 0x19, // FiRa Sub-Element
    (byte) 0x02, (byte) 0x00, // Profile ID
    (byte) 0x06, (byte) 0x02, (byte) 0x20, (byte) 0x08, // MAC Address
    (byte) 0x14, (byte) 0x01, (byte) 0x0C, // Preamble Index
    (byte) 0x27, (byte) 0x02, (byte) 0x08, (byte) 0x07, // Vendor ID
    (byte) 0x28, (byte) 0x06, (byte) 0xCA, (byte) 0xC8, (byte) 0xA6, (byte) 0xF7, (byte) 0x6F, (byte) 0x08, // Static STS IV
    (byte) 0x08, (byte) 0x02, (byte) 0x60, (byte) 0x09, // Slot Duration
    (byte) 0x1B, (byte) 0x01, (byte) 0x0A, // Slots per RR
    (byte) 0x09, (byte) 0x04, (byte) 0xE8, (byte) 0x03, (byte) 0x00, (byte) 0x00, // Duration
    (byte) 0x9F, (byte) 0x04, (byte) 0x67, (byte) 0x45, (byte) 0x23, (byte) 0x01  // Session ID
};

// BLE Configuration
byte[] bleConfig = {
    (byte) 0x2D, (byte) 0x16, (byte) 0xF4, (byte) 0xFF, // Header
    (byte) 0x5F, (byte) 0x19, // FiRa Sub-Element
    (byte) 0x02, (byte) 0x00, // Profile ID
    (byte) 0x06, (byte) 0x02, (byte) 0x20, (byte) 0x08, // MAC Address
    (byte) 0x14, (byte) 0x01, (byte) 0x0C, // Preamble Index
    (byte) 0x27, (byte) 0x02, (byte) 0x08, (byte) 0x07, // Vendor ID
    (byte) 0x28, (byte) 0x06, (byte) 0xCA, (byte) 0xC8, (byte) 0xA6, (byte) 0xF7, (byte) 0x6F, (byte) 0x08, // Static STS IV
    (byte) 0x08, (byte) 0x02, (byte) 0x60, (byte) 0x09, // Slot Duration
    (byte) 0x1B, (byte) 0x01, (byte) 0x0A, // Slots per RR
    (byte) 0x09, (byte) 0x04, (byte) 0xE8, (byte) 0x03, (byte) 0x00, (byte) 0x00, // Duration
    (byte) 0x9F, (byte) 0x04, (byte) 0x67, (byte) 0x45, (byte) 0x23, (byte) 0x01  // Session ID
};

If you can't use an OOB configuration because it is missing, or if you need to change default values that aren't in the OOB config, you can build parameters with DlTdoaRangingParams.Builder as shown in the following snippet. You can use these parameters in place of DlTdoaRangingParams.createFromFiraConfigPacket():

Kotlin

val dlTdoaParams = DlTdoaRangingParams.Builder(1)
    .setComplexChannel(UwbComplexChannel.Builder()
            .setChannel(9).setPreambleIndex(10).build())
    .setDeviceAddress(deviceAddress)
    .setSessionKeyInfo(byteArrayOf(0x01, 0x02, 0x03, 0x04))
    .setRangingIntervalMillis(240)
    .setSlotDuration(UwbRangingParams.DURATION_2_MS)
    .setSlotsPerRangingRound(20)
    .setRangingRoundIndexes(byteArrayOf(0x01, 0x05))
    .build()

Java

DlTdoaRangingParams dlTdoaParams = new DlTdoaRangingParams.Builder(1)
    .setComplexChannel(new UwbComplexChannel.Builder()
            .setChannel(9).setPreambleIndex(10).build())
    .setDeviceAddress(deviceAddress)
    .setSessionKeyInfo(new byte[]{0x01, 0x02, 0x03, 0x04})
    .setRangingIntervalMillis(240)
    .setSlotDuration(UwbRangingParams.DURATION_2_MS)
    .setSlotsPerRangingRound(20)
    .setRangingRoundIndexes(new byte[]{0x01, 0x05})
    .build();

功能和 API 使用集合让一切井井有条 根据您的偏好保存内容并对其进行分类。

核心功能

新的 ProfilingManager 触发器

应用异常的性能分析触发器

JobDebugInfo API

通过为允许空闲时运行的闹钟提供监听器支持，减少唤醒锁定

隐私权

加密客户端 Hello (ECH) 平台支持

Android 联系人选择器

安全

Android 高级保护模式 (AAPM)

PQC APK 签名

Impact on developers

连接

受限卫星网络

用户体验和系统界面

专用 Google 助理音量音频流

Handoff

实时更新 - 语义颜色 API

Coloring

适用于 Android 17 的 UWB 下行链路 TDoA API

Kotlin

Java

Out-of-Band (OOB) Configurations

Java

Kotlin

Java

功能和 API