Como nas versões anteriores, o Android 14 inclui mudanças de comportamento que podem afetar seu app. As seguintes mudanças de comportamento se aplicam exclusivamente a apps destinados ao Android 14 (nível 34 da API) ou mais recente. Caso seu app seja direcionado ao Android 14 ou a versões mais recentes, faça modificações para oferecer suporte a esses comportamentos de forma adequada, quando aplicável.
Consulte também a lista de mudanças de comportamento que afetam todos os apps
executados no Android 14, independente da
targetSdkVersion
do app.
Principal recurso
Os tipos de serviço em primeiro plano são obrigatórios
如果您的应用以 Android 14(API 级别 34)或更高版本为目标平台,则必须为应用中的每个前台服务至少指定一项前台服务类型。您应选择一个能代表应用用例的前台服务类型。系统需要特定类型的前台服务满足特定用例。
如果应用中的用例与这些类型均不相关,强烈建议您迁移逻辑以使用 WorkManager 或用户发起的数据传输作业。
Aplicação da permissão BLUETOOTH_CONNECT no BluetoothAdapter
Android 14 enforces the BLUETOOTH_CONNECT
permission when calling the
BluetoothAdapter
getProfileConnectionState()
method for apps targeting
Android 14 (API level 34) or higher.
This method already required the BLUETOOTH_CONNECT
permission, but it was not
enforced. Make sure your app declares BLUETOOTH_CONNECT
in your app's
AndroidManifest.xml
file as shown in the following snippet and check that
a user has granted the permission before calling
getProfileConnectionState
.
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
Atualizações do OpenJDK 17
Android 14 continues the work of refreshing Android's core libraries to align with the features in the latest OpenJDK LTS releases, including both library updates and Java 17 language support for app and platform developers.
A few of these changes can affect app compatibility:
- Changes to regular expressions: Invalid group references are now
disallowed to more closely follow the semantics of OpenJDK. You might see
new cases where an
IllegalArgumentException
is thrown by thejava.util.regex.Matcher
class, so make sure to test your app for areas that use regular expressions. To enable or disable this change while testing, toggle theDISALLOW_INVALID_GROUP_REFERENCE
flag using the compatibility framework tools. - UUID handling: The
java.util.UUID.fromString()
method now does more strict checks when validating the input argument, so you might see anIllegalArgumentException
during deserialization. To enable or disable this change while testing, toggle theENABLE_STRICT_VALIDATION
flag using the compatibility framework tools. - ProGuard issues: In some cases, the addition of the
java.lang.ClassValue
class causes an issue if you try to shrink, obfuscate, and optimize your app using ProGuard. The problem originates with a Kotlin library that changes runtime behaviour based on whetherClass.forName("java.lang.ClassValue")
returns a class or not. If your app was developed against an older version of the runtime without thejava.lang.ClassValue
class available, then these optimizations might remove thecomputeValue
method from classes derived fromjava.lang.ClassValue
.
O JobScheduler reforça o callback e o comportamento da rede
Since its introduction, JobScheduler expects your app to return from
onStartJob
or onStopJob
within a few seconds. Prior to Android 14,
if a job runs too long, the job is stopped and fails silently.
If your app targets Android 14 (API level 34) or higher and
exceeds the granted time on the main thread, the app triggers an ANR
with the error message "No response to onStartJob
" or
"No response to onStopJob
".
This ANR may be a result of 2 scenarios:
1. There is work blocking the main thread, preventing the callbacks onStartJob
or onStopJob
from executing and completing within the expected time limit.
2. The developer is running blocking work within the JobScheduler
callback onStartJob
or onStopJob
, preventing the callback from
completing within the expected time limit.
To address #1, you will need to further debug what is blocking the main thread
when the ANR occurs, you can do this using
ApplicationExitInfo#getTraceInputStream()
to get the tombstone
trace when the ANR occurs. If you're able to manually reproduce the ANR,
you can record a system trace and inspect the trace using either
Android Studio or Perfetto to better understand what is running on
the main thread when the ANR occurs.
Note that this can happen when using JobScheduler API directly
or using the androidx library WorkManager.
To address #2, consider migrating to WorkManager, which provides
support for wrapping any processing in onStartJob
or onStopJob
in an asynchronous thread.
JobScheduler
also introduces a requirement to declare the
ACCESS_NETWORK_STATE
permission if using setRequiredNetworkType
or
setRequiredNetwork
constraint. If your app does not declare the
ACCESS_NETWORK_STATE
permission when scheduling the job and is targeting
Android 14 or higher, it will result in a SecurityException
.
API de inicialização de blocos
对于以 Android 14 及更高版本为目标平台的应用,
TileService#startActivityAndCollapse(Intent)
已弃用,现在会抛出
调用时抛出异常。如果您的应用从功能块启动 activity,请使用
TileService#startActivityAndCollapse(PendingIntent)
。
Privacidade
Acesso parcial a fotos e vídeos
Android 14 引入了“已选照片访问权限”,让用户可以向应用授予对其媒体库中特定图片和视频的访问权限,而不是授予对给定类型的所有媒体的访问权限。
只有当您的应用以 Android 14(API 级别 34)或更高版本为目标平台时,此更改才会启用。如果您尚未使用照片选择器,我们建议您在应用中实现照片选择器,以提供一致的图片和视频选择体验,同时增强用户隐私保护,而无需请求任何存储权限。
如果您使用存储权限维护自己的图库选择器,并且需要对实现保持完全控制,请调整实现以使用新的 READ_MEDIA_VISUAL_USER_SELECTED
权限。如果您的应用不使用新权限,系统会以兼容模式运行您的应用。
Experiência do usuário
Notificações seguras de intent de tela cheia
With Android 11 (API level 30), it was possible for any app to use
Notification.Builder.setFullScreenIntent
to send full-screen
intents while the phone is locked. You could auto-grant this on app install by
declaring USE_FULL_SCREEN_INTENT
permission in the
AndroidManifest.
Full-screen intent notifications are designed for extremely high-priority
notifications demanding the user's immediate attention, such as an incoming
phone call or alarm clock settings configured by the user. For apps targeting
Android 14 (API level 34) or higher, apps that are allowed to use this
permission are limited to those that provide calling and alarms only. The Google
Play Store revokes default USE_FULL_SCREEN_INTENT
permissions for any apps
that don't fit this profile. The deadline for these policy changes is May 31,
2024.
This permission remains enabled for apps installed on the phone before the user updates to Android 14. Users can turn this permission on and off.
You can use the new API
NotificationManager.canUseFullScreenIntent
to check if your app
has the permission; if not, your app can use the new intent
ACTION_MANAGE_APP_USE_FULL_SCREEN_INTENT
to launch the settings
page where users can grant the permission.
Segurança
Restrições a intents implícitas e pendentes
Para apps destinados ao Android 14 (nível 34 da API) ou mais recentes, o Android impede que intents implícitas sejam enviadas para componentes internos do app das seguintes maneiras:
- Intents implícitas são entregues apenas a componentes exportados. Os apps precisam usar uma intent explícita para enviar para componentes não exportados ou marcar o componente como exportado.
- Se um app criar uma intent pendente mutável com uma intent que não especifica um componente ou pacote, o sistema vai gerar uma exceção.
Essas mudanças impedem que apps maliciosos interceptem intents implícitas destinadas ao uso de componentes internos de um app.
Confira um filtro de intent que pode ser declarado no arquivo de manifesto do app:
<activity
android:name=".AppActivity"
android:exported="false">
<intent-filter>
<action android:name="com.example.action.APP_ACTION" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
Se o app tentar iniciar essa atividade usando uma intent implícita, uma
exceção ActivityNotFoundException
será gerada:
Kotlin
// Throws an ActivityNotFoundException exception when targeting Android 14. context.startActivity(Intent("com.example.action.APP_ACTION"))
Java
// Throws an ActivityNotFoundException exception when targeting Android 14. context.startActivity(new Intent("com.example.action.APP_ACTION"));
Para iniciar a atividade não exportada, o app precisa usar uma intent explícita:
Kotlin
// This makes the intent explicit. val explicitIntent = Intent("com.example.action.APP_ACTION") explicitIntent.apply { package = context.packageName } context.startActivity(explicitIntent)
Java
// This makes the intent explicit. Intent explicitIntent = new Intent("com.example.action.APP_ACTION") explicitIntent.setPackage(context.getPackageName()); context.startActivity(explicitIntent);
Os broadcast receivers registrados no ambiente de execução precisam especificar o comportamento de exportação
Apps and services that target Android 14 (API level 34) or higher and use
context-registered receivers are required to specify a flag
to indicate whether or not the receiver should be exported to all other apps on
the device: either RECEIVER_EXPORTED
or RECEIVER_NOT_EXPORTED
, respectively.
This requirement helps protect apps from security vulnerabilities by leveraging
the features for these receivers introduced in Android 13.
Exception for receivers that receive only system broadcasts
If your app is registering a receiver only for
system broadcasts through Context#registerReceiver
methods, such as Context#registerReceiver()
, then it
shouldn't specify a flag when registering the receiver.
Carregamento mais seguro de código dinâmico
If your app targets Android 14 (API level 34) or higher and uses Dynamic Code Loading (DCL), all dynamically-loaded files must be marked as read-only. Otherwise, the system throws an exception. We recommend that apps avoid dynamically loading code whenever possible, as doing so greatly increases the risk that an app can be compromised by code injection or code tampering.
If you must dynamically load code, use the following approach to set the dynamically-loaded file (such as a DEX, JAR, or APK file) as read-only as soon as the file is opened and before any content is written:
Kotlin
val jar = File("DYNAMICALLY_LOADED_FILE.jar") val os = FileOutputStream(jar) os.use { // Set the file to read-only first to prevent race conditions jar.setReadOnly() // Then write the actual file content } val cl = PathClassLoader(jar, parentClassLoader)
Java
File jar = new File("DYNAMICALLY_LOADED_FILE.jar"); try (FileOutputStream os = new FileOutputStream(jar)) { // Set the file to read-only first to prevent race conditions jar.setReadOnly(); // Then write the actual file content } catch (IOException e) { ... } PathClassLoader cl = new PathClassLoader(jar, parentClassLoader);
Handle dynamically-loaded files that already exist
To prevent exceptions from being thrown for existing dynamically-loaded files, we recommend deleting and recreating the files before you try to dynamically load them again in your app. As you recreate the files, follow the preceding guidance for marking the files read-only at write time. Alternatively, you can re-label the existing files as read-only, but in this case, we strongly recommend that you verify the integrity of the files first (for example, by checking the file's signature against a trusted value), to help protect your app from malicious actions.
Mais restrições para o início de atividades em segundo plano
对于以 Android 14(API 级别 34)或更高版本为目标平台的应用,系统会进一步限制允许应用在后台启动 activity 的时间:
- 现在,当应用使用
PendingIntent#send()
或类似方法发送PendingIntent
时,如果它想要授予自己的后台 activity 启动待处理 intent 的启动特权,则必须选择启用。如需选择启用,应用应通过setPendingIntentBackgroundActivityStartMode(MODE_BACKGROUND_ACTIVITY_START_ALLOWED)
传递ActivityOptions
软件包。 - 当可见应用使用
bindService()
方法绑定其他在后台应用的服务时,如果可见应用想要授予自己的后台 activity 对绑定服务的启动特权,则必须选择启用。如需选择启用,应用应在调用bindService()
方法时包含BIND_ALLOW_ACTIVITY_STARTS
标志。
这些更改扩大了一组现有限制条件的范围,目的是防止恶意应用滥用 API 以在后台启动干扰性活动,从而保护用户。
Travessia de caminhos de arquivo ZIP
Em apps destinados ao Android 14 (nível 34 da API) ou mais recente, o Android evita a vulnerabilidade
da travessia de caminhos de arquivo ZIP da seguinte forma:
ZipFile(String)
e
ZipInputStream.getNextEntry()
geram uma
ZipException
quando os nomes dos arquivos ZIP têm ".." ou começam
com "/".
Os apps podem desativar essa validação chamando
dalvik.system.ZipPathValidator.clearCallback()
.
O consentimento do usuário é necessário para cada sessão de captura de MediaProjection
Para apps destinados ao Android 14 (nível 34 da API) ou mais recente, uma SecurityException
é
gerada por MediaProjection#createVirtualDisplay
em um dos seguintes
cenários:
- O app armazena em cache o
Intent
retornado peloMediaProjectionManager#createScreenCaptureIntent
e o transmite várias vezes paraMediaProjectionManager#getMediaProjection
. - O app invoca
MediaProjection#createVirtualDisplay
várias vezes na mesma instância deMediaProjection
.
O app precisa pedir o consentimento do usuário antes de cada sessão de captura. Uma única
sessão de captura é uma única invocação em
MediaProjection#createVirtualDisplay
, e cada instância de MediaProjection
precisa
ser usada apenas uma vez.
Gerenciar mudanças de configuração
Se o app precisar invocar MediaProjection#createVirtualDisplay
para processar
mudanças de configuração, como a orientação ou o tamanho da tela,
siga estas etapas para atualizar o VirtualDisplay
da instância
MediaProjection
atual:
- Invoque
VirtualDisplay#resize
com a nova largura e altura. - Forneça um novo
Surface
com a nova largura e altura paraVirtualDisplay#setSurface
.
Registrar um callback
Seu app precisa registrar um callback para processar casos em que o usuário não concede
consentimento para continuar uma sessão de captura. Para fazer isso, implemente
Callback#onStop
e faça o app liberar todos os recursos relacionados, como
VirtualDisplay
e Surface
.
Se o app não registrar esse callback,
MediaProjection#createVirtualDisplay
vai gerar uma IllegalStateException
quando o app o invocar.
Atualização das restrições não SDK
Android 14 includes updated lists of restricted non-SDK interfaces based on collaboration with Android developers and the latest internal testing. Whenever possible, we make sure that public alternatives are available before we restrict non-SDK interfaces.
If your app does not target Android 14, some of these changes might not immediately affect you. However, while you can currently use some non-SDK interfaces (depending on your app's target API level), using any non-SDK method or field always carries a high risk of breaking your app.
If you are unsure if your app uses non-SDK interfaces, you can test your app to find out. If your app relies on non-SDK interfaces, you should begin planning a migration to SDK alternatives. Nevertheless, we understand that some apps have valid use cases for using non-SDK interfaces. If you cannot find an alternative to using a non-SDK interface for a feature in your app, you should request a new public API.
如需详细了解此 Android 版本中的变更,请参阅 Android 14 中有关限制非 SDK 接口的更新。如需全面了解有关非 SDK 接口的详细信息,请参阅对非 SDK 接口的限制。