行为变更：所有应用

Android 17 平台包含一些可能会影响您的应用的行为变更。以下行为变更将影响在 Android 17 上运行的所有应用，无论采用哪种 targetSdkVersion 都不例外。您应该测试您的应用，然后根据需要酌情修改，以便支持这些变更。

此外，请务必查看仅影响以 Android 17 为目标平台的应用的行为变更列表。

注意： 本页列出了一些比较重要的变更。如需了解更多详细信息，请参阅 Android 17 版本说明。

核心功能

Android 17（API 级别 37）包含以下变更，这些变更会修改或扩展 Android 系统的各种核心功能。

应用内存限制

Android 17 introduces app memory limits based on the device's total RAM to create a more stable and deterministic environment for your applications and Android users. In Android 17, limits are set conservatively to establish system baselines, targeting extreme memory leaks and other outliers before they trigger system-wide instability resulting in UI stuttering, higher battery drain, and apps being killed. While we anticipate minimal impact on the vast majority of app sessions, we recommend the following memory best practices, including establishing a baseline for memory.

Note: Memory limits are only imposed on a subset of Android devices.

You can determine if your app session was impacted by calling getDescription in ApplicationExitInfo; if your app was affected, the exit reason will be REASON_OTHER and the description will contain the string "MemoryLimiter:AnonSwap" along with other information. You can also use trigger-based profiling with TRIGGER_TYPE_ANOMALY to get heap dumps that are collected when the memory limit is hit.

The Manage your app's memory documentation gives information to help you diagnose your app's memory issues and optimize its resource consumption.

Test your app's behavior under the memory constraints

You can use Android Debug Bridge (adb) to adjust or disable the memory limits on any device that imposes them. The shell command am provides three subcommands to adjust the memory limits. (These commands have no effect on a device which does not impose memory limits.)

• am memory-limiter ignore <uid>|none|all
• am memory-limiter manual <pid> <limit>|max|none
• am memory-limiter status

ignore

Instructs the memory limiter to ignore some or all processes. Passing a UID instructs the memory limiter to ignore all processes associated with that UID. You can also pass all (ignore all processes) or none (do not ignore any processes). Passing none overrides any previous calls to am memory-limiter ignore.

If you instruct the memory limiter to ignore a process, you can still apply a manual memory limit to the process by calling am memory-limiter manual.

manual

Instructs the system to impose a memory constraint on the process with the specified PID. The memory constraint is specified as an integer number of MB; for example, passing 30 specifies that the process is limited to 30 MB of memory. Passing max removes all memory limits on that process. Passing none removes any manual limits set on the process, restoring the system's default limit (if any).

status

Reports the current status of the memory limiter. The status includes the memory limits imposed on visible and non-visible processes.

隐私权

Android 17 包含以下变更，旨在提升用户隐私保护。

动态短信密码保护

从 Android 17 开始，Android 将扩大对包含一次性密码 (OTP) 的短信的保护范围。

在之前的 Android 版本中，此保护主要侧重于 SMS Retriever 格式。对于大多数应用，包含 SMS Retriever 哈希的消息的递送延迟了 3 小时。不过，某些特定应用（例如默认短信处理程序）不受此延迟的影响，拥有哈希的应用也不受此延迟的影响。

从 Android 17 开始，此保护也适用于 WebOTP 格式的消息。如果应用有权读取短信，但不是 WebOTP 消息的预期接收者（由网域验证确定），则该应用在收到消息后 3 小时内无法访问该消息。此变更旨在提高用户安全性，确保只有与消息中提及的网域关联的应用才能以程序化方式读取验证码。

在这 3 小时的延迟期间，系统会保留 SMS_RECEIVED_ACTION 广播，并过滤 短信提供商 数据库查询。延迟结束后，这些应用即可使用短信。此变更适用于 所有应用，无论其目标 API 级别如何。

某些应用（例如默认短信辅助应用、已连接设备配套应用等）不受此延迟的影响。所有依赖于读取短信 来提取 动态密码 的应用都应过渡到使用 SMS Retriever 或 SMS User Consent API，以确保功能持续可用。

注意 ：如果您的应用以 Android 17（API 级别 37）或更高版本为目标平台，此 保护也会扩展到标准短信。如需了解详情，请参阅 标准短信的动态密码保护在 行为变更： 以 Android 17 为目标平台的应用文档中。

安全

Android 17 包含以下设备和应用安全方面的改进。

usesClearTraffic 弃用计划

我们计划在未来的版本中弃用 usesCleartextTraffic 元素。需要建立未加密 (HTTP) 连接的应用应迁移为使用网络安全配置文件，该文件可让您指定应用需要与哪些网域建立明文连接。

请注意，网络安全配置文件仅在 API 级别 24 及更高版本中受支持。如果您的应用的最低 API 级别低于 24，您应执行以下两项操作：

• 将 usesCleartextTraffic 属性设置为 true
• 使用网络配置文件

如果应用的最低 API 级别为 24 或更高，您可以使用网络配置文件，而无需设置 usesCleartextTraffic。

限制隐式 URI 授权

目前，如果应用启动的 intent 具有 URI，且该 URI 具有操作 ACTION_SEND、ACTION_SEND_MULTIPLE或 ACTION_IMAGE_CAPTURE，则系统会自动向目标应用授予读取和 写入 URI 权限。从 Android 18 开始，系统将 不再自动授予这些权限。因此，我们建议应用明确授予相关 URI 权限，而不是依赖系统授予这些权限。

如需检测应用中这些 intent 的使用情况，请将 StrictMode 与 detectImplicitUriPermissionGrant() 结合使用，以触发违规行为：

Kotlin

val policy = StrictMode.VmPolicy.Builder()
    .detectImplicitUriPermissionGrant()
    .penaltyLog()
    .build()
StrictMode.setVmPolicy(policy)

Java

StrictMode.VmPolicy policy = new StrictMode.VmPolicy.Builder()
    .detectImplicitUriPermissionGrant()
    .penaltyLog()
    .build();
StrictMode.setVmPolicy(policy);

或者，您也可以监控包含消息 Please set the grant explicitly in the app 的已记录异常，该消息会在系统隐式设置授予时显示。您可以使用以下 adb 命令监控这些日志：

adb logcat | grep "Please set the grant explicitly in the app"

如需明确授予必要的权限，请将 FLAG_GRANT_READ_URI_PERMISSION标志添加到ACTION_SEND和 ACTION_SEND_MULTIPLEintent：

Kotlin

intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)

Java

intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

对于 ACTION_IMAGE_CAPTURE intent，请同时添加FLAG_GRANT_READ_URI_PERMISSION 和 FLAG_GRANT_WRITE_URI_PERMISSION 标志：

Kotlin

intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION)

Java

intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

每个应用的密钥库限制

Apps should avoid creating excessive numbers of keys in Android Keystore, because it is a shared resource for all apps on the device. Beginning with Android 17, the system enforces a limit on the number of keys an app can own. The limit is 50,000 keys for non-system apps targeting Android 17 (API level 37) or higher, and 200,000 keys for all other apps. System apps have a limit of 200,000 keys, regardless of which API level they target.

If an app attempts to create keys beyond the limit, the creation fails with a KeyStoreException. The exception's message string contains information about the key limit. If the app calls getNumericErrorCode() on the exception, the return value depends on what API level the app targets:

• Apps targeting Android 17 (API level 37) or higher: getNumericErrorCode() returns the new ERROR_TOO_MANY_KEYS value.
• All other apps: getNumericErrorCode() returns ERROR_INCORRECT_USAGE.

阻止跨资料环回流量

Beginning with Android 17, cross-profile loopback traffic is no longer permitted by default. Loopback traffic within the same profile is not affected. This change applies to all apps running on Android 17 or higher, regardless of what API level the app targets.

用户体验和系统界面

Android 17 包含以下变更，旨在打造更一致、更直观的用户体验。

在旋转后恢复默认 IME 可见性

Beginning with Android 17, when the device's configuration changes (for example, through rotation), and this is not handled by the app itself, the previous IME visibility is not restored.

If your app undergoes a configuration change that it does not handle, and the app needs the keyboard to be visible after the change, you must explicitly request this. You can make this request in one of the following ways:

• Set the android:windowSoftInputMode attribute to stateAlwaysVisible.
• Programmatically request the soft keyboard in your activity's onCreate() method, or add the onConfigurationChanged() method.

人工输入

Android 17 包含以下变更，这些变更会影响应用与键盘和触控板等人工输入设备的互动方式。

在指针捕获期间，触控板默认传递相对事件

Beginning with Android 17, if an app requests pointer capture using View.requestPointerCapture() and the user uses a touchpad, the system recognizes pointer movement and scrolling gestures from the user's touches and reports them to the app in the same way as pointer and scroll wheel movements from a captured mouse. In most cases, this removes the need for apps that support captured mice to add special handling logic for touchpads. For more details, see the documentation for View.POINTER_CAPTURE_MODE_RELATIVE.

Previously, the system did not attempt to recognize gestures from the touchpad, and instead delivered the raw, absolute finger locations to the app in a similar format to touchscreen touches. If an app still requires this absolute data, it should call the new View.requestPointerCapture(int) method with View.POINTER_CAPTURE_MODE_ABSOLUTE instead.

媒体

Android 17 针对媒体行为做了以下更改。

后台音频安全加固

Beginning with Android 17, the audio framework enforces restrictions on background audio interactions including audio playback, audio focus requests, and volume change APIs to ensure that these changes are started intentionally by the user.

If the app tries to call audio APIs while the app is not in a valid lifecycle, the audio playback and volume change APIs fail silently without throwing an exception or providing a failure message. The audio focus API fails with the result code AUDIOFOCUS_REQUEST_FAILED.

Note: The restrictions are more stringent if an app targets Android 17 (API level 37). For these apps, the foreground service must have while-in-use (WIU) capabilities, unless the app has the exact alarm permission and is interacting with USAGE_ALARM audio streams.

For more information, including mitigation strategies, see Background audio hardening.

连接

Android 17 包含以下变更，以增强设备连接性。

针对蓝牙绑定丢失的自主重新配对

Android 17 introduces autonomous re-pairing, a system-level enhancement designed to automatically resolve Bluetooth bond loss.

Previously, if a bond was lost, users had to manually navigate to Settings to unpair and then re-pair the peripheral. This feature builds upon the security improvement of Android 16 by allowing the system to re-establish bonds in the background without requiring users to manually navigate to Settings to unpair and re-pair peripherals.

While most apps will not require code changes, developers should be aware of the following behavior changes in Bluetooth stack:

• New pairing context: The ACTION_PAIRING_REQUEST now includes the EXTRA_PAIRING_CONTEXT extra which allows apps to distinguish between a standard pairing request and an autonomous system-initiated re-pairing attempt.
• Conditional key updates: Existing security keys will only be replaced if the re-pairing is successful and new connection meets or exceeds the security level of the previous bond.
• Modified intent timing: The ACTION_KEY_MISSING intent is now broadcast only if the autonomous re-pairing attempt fails. This reduces unnecessary error handling in the app if the system successfully recovers the bond in the background.
• User notification: The system manages re-pairing via new UI notifications and dialogs. Users will be prompted to confirm the re-pairing attempt to ensure they are aware of the reconnection.

Peripheral device manufacturers and companion app developers should verify that hardware and app gracefully handle bond transitions. To test this behavior, simulate a remote bond loss using either of the following methods:

• Manually remove the bond information from the peripheral device
• Manually unpair the device in: Settings > Connected devices