为何 WorkManager 在 Direct Boot 下无法正常初始化？

一、问题描述

在使用 WorkManager 库来实现开机上报设备信息和定时上报设备信息时，当 Android 设备设置屏幕锁定密码并未解锁时，此时 WorkManager 会无法初始化导致异常无法执行任务。

09-08 09:44:41.744  18271827 E AndroidRuntime: FATAL EXCEPTION: main
09-08 09:44:41.744  18271827 E AndroidRuntime: Process: com.xxx.devicereport, PID: 1827
09-08 09:44:41.744  18271827 E AndroidRuntime: java.lang.RuntimeException: Unable to get provider androidx.startup.InitializationProvider: androidx.startup.StartupException: java.lang.IllegalStateException: Cannot initialize WorkManager in direct boot mode
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.app.ActivityThread.installProvider(ActivityThread.java:7940)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.app.ActivityThread.installContentProviders(ActivityThread.java:7444)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:7148)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.app.ActivityThread.-$$Nest$mhandleBindApplication(Unknown Source:0)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2328)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:106)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.os.Looper.loopOnce(Looper.java:205)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:294)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:8408)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:640)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:982)
09-08 09:44:41.744  18271827 E AndroidRuntime: Caused by: androidx.startup.StartupException: java.lang.IllegalStateException: Cannot initialize WorkManager in direct boot mode
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.startup.AppInitializer.doInitialize(AppInitializer.java:187)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.startup.AppInitializer.discoverAndInitialize(AppInitializer.java:239)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.startup.AppInitializer.discoverAndInitialize(AppInitializer.java:207)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.startup.InitializationProvider.onCreate(InitializationProvider.java:49)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.content.ContentProvider.attachInfo(ContentProvider.java:2621)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.content.ContentProvider.attachInfo(ContentProvider.java:2590)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at android.app.ActivityThread.installProvider(ActivityThread.java:7935)
09-08 09:44:41.744  18271827 E AndroidRuntime:        ... 11more
09-08 09:44:41.744  18271827 E AndroidRuntime: Caused by: java.lang.IllegalStateException: Cannot initialize WorkManager in direct boot mode
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.work.impl.WorkManagerImpl.<init>(WorkManagerImpl.java:237)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.work.impl.WorkManagerImplExtKt.createWorkManager(WorkManagerImplExt.kt:48)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.work.impl.WorkManagerImplExtKt.createWorkManager$default(WorkManagerImplExt.kt:29)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.work.impl.WorkManagerImplExtKt.createWorkManager(WorkManagerImplExt.kt:0)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.work.impl.WorkManagerImpl.initialize(WorkManagerImpl.java:206)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.work.WorkManager.initialize(WorkManager.java:212)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.work.WorkManagerInitializer.create(WorkManagerInitializer.java:39)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.work.WorkManagerInitializer.create(WorkManagerInitializer.java:30)
09-08 09:44:41.744  18271827 E AndroidRuntime:        at androidx.startup.AppInitializer.doInitialize(AppInitializer.java:180)
09-08 09:44:41.744  18271827 E AndroidRuntime:        ... 17more

二、问题分析

2.1 关于 Direct Boot 模式

Android中的 Direct Boot 模式（直接启动模式）是Android 7.它允许设备在启动后、用户解锁前的锁定状态下运行特定的应用组件，确保关键功能（如闹钟、紧急通知和无障碍服务）在设备重启后仍能正常工作。

核心设计目标

Direct Boot模式解决了全盘加密（FDE）设备重启后需用户解锁才能运行应用的问题。通过文件级加密（FBE）和两个独立的存储分区，系统在未解锁状态下仍能有限运行：

• 设备加密存储（DE） ：使用设备硬件绑定的密钥加密，在Direct Boot模式和用户解锁后均可访问。
• 凭据加密存储（CE） ：使用用户凭据（如密码、PIN）加密，仅在用户解锁后可用。

加密路径
/data/user_de/0/com.xxx.aidevicereport
非加密
/data/user/0/com.xxx.devicereport

实现方式

组件标记 在AndroidManifest.xml中将组件（Application、Activity、Service、BroadcastReceiver等）设置为 android:directBootAware="true" 。

2.2 支持 Direct Boot 模式

关于设备开启重启后的几个广播

// 无论直接启动支持如何，在启动时立即发送publicstaticfinalString ACTION_LOCKED_BOOT_COMPLETED ="android.intent.action.LOCKED_BOOT_COMPLETED";// 目标用户解锁凭据加密的专用存储时发送publicstaticfinalString ACTION_USER_UNLOCKED ="android.intent.action.USER_UNLOCKED";// 设备解锁后发送publicstaticfinalString ACTION_BOOT_COMPLETED ="android.intent.action.BOOT_COMPLETED";

查询用户是否已解锁设备的方法

UserManager userManager =(UserManager)getSystemService(Context.USER_SERVICE);if(userManager !=null){boolean isUserUnlocked = userManager.isUserUnlocked();Log.d(TAG,"Application isUserUnlocked："+ isUserUnlocked);}

访问设备加密存储空间的方法，通过此上下文 createDeviceProtectedStorageContext() 发出的所有存储 API 调用均访问设备加密存储空间，包括 文件 、 数据库 和 SharedPreferences 。

Context directBootContext = appContext.createDeviceProtectedStorageContext();// Access appDataFilename that lives in device encrypted storageFileInputStream inStream = directBootContext.openFileInput(appDataFilename);// Use inStream to read content...

官方文档：

2.3 手动初始化 WorkManager 组件

网上很多解决方案是手动完成 WorkManager 组件的初始化，对于大多数的应用是在设备解锁后使用的是可以解决的，但是在需要在设备未解锁的状态下仍需要执行任务的情况就不适用了。

停用 WorkManager 组件自动初始化

<providerandroid:name="androidx.startup.InitializationProvider"android:authorities="${applicationId}.androidx-startup"tools:node="remove"></provider>

让你的 Application 类实现 Configuration.Provider 接口，并提供您自己的 Configuration.Provider.getWorkManagerConfiguration 。 当您需要使用 WorkManager 时，请务必调用 WorkManager.getInstance(Context) 。 WorkManager 会调用应用的自定义 getWorkManagerConfiguration() 方法来发现其 Configuration 。（无需自行调用 WorkManager.initialize 。）

classMyApplicationextendsApplicationimplementsConfiguration.Provider{@OverridepublicConfigurationgetWorkManagerConfiguration(){returnnewConfiguration.Builder().setMinimumLoggingLevel(android.util.Log.INFO).build();}}

官方文档：

2.4 WorkManager 不支持 Direct Boot 的官方修改

Gerrit Commit：

Throw an exception when trying to initialize WorkManager in direct boot mode.
* WorkManager does not support direct boot mode. Therefore when an app tries to
  initialize WorkManager in direct boot mode, we now throw an IllegalStateException.
Test: Added unit tests.
Change-Id: I549cca9aae0e8d5136a59719226c647dd3b1bb8b

/**
 * Initializes an instance of {@link WorkManagerImpl}.
 *
 * @param context The application {@link Context}
 * @param configuration The {@link Configuration} configuration
 * @param workDatabase The {@link WorkDatabase} instance
 * @param schedulers The {@link List} of {@link Scheduler}s to use
 * @param processor The {@link Processor} instance
 */privatevoidinternalInit(@NonNullContext context,@NonNullConfiguration configuration,@NonNullTaskExecutor workTaskExecutor,@NonNullWorkDatabase workDatabase,@NonNullList<Scheduler> schedulers,@NonNullProcessor processor){
    context = context.getApplicationContext();
    mContext = context;
    mConfiguration = configuration;
    mWorkTaskExecutor = workTaskExecutor;
    mWorkDatabase = workDatabase;
    mSchedulers = schedulers;
    mProcessor = processor;
    mPreferenceUtils =newPreferenceUtils(workDatabase);
    mForceStopRunnableCompleted =false;// Check for direct boot modeif(Build.VERSION.SDK_INT >=Build.VERSION_CODES.N&& context.isDeviceProtectedStorage()){thrownewIllegalStateException("Cannot initialize WorkManager in direct boot mode");}// Checks for app force stops.
    mWorkTaskExecutor.executeOnBackgroundThread(newForceStopRunnable(context,this));}

三、解决方案

当应用会在 Direct Boot 模式下启动并完成初始化，还需要执行相关的任务，这里需要解决 2 个问题，其一是 WorkManager 的初始化，其二是访问设备加密存储，操作文件、数据库或 SharedPreferences，否则可能会出现如下报错：

09-05 16:17:43.361  19762111 E AndroidRuntime: Caused by: android.database.sqlite.SQLiteCantOpenDatabaseException: Cannot open database '/data/user/0/com.xxx.devicereport/no_backup/androidx.work.workdb' with flags 0x30000000: Directory /data/user/0/com.revomovil.devicereport/no_backup doesn't exist

09-04 14:47:40.445  53555355 E AndroidRuntime: Caused by: java.lang.IllegalStateException: SharedPreferences in credent
ial encrypted storage are not available until after user (id 0) is unlocked

因为应用是支持 Direct Boot 模式是，所以你的应用需要声明 directBootAware

<applicationandroid:name=".DeviceReportApplication"android:directBootAware="true"android:label="@string/app_name"android:persistent="true"android:usesCleartextTraffic="true"/>

规避 WorkManager 的初始化时的 IllegalStateException: Cannot initialize WorkManager in direct boot mode ，根据源码处的判断将 isDeviceProtectedStorage() 返回 false 即可

publicclassDeviceReportApplicationextendsApplication{privatestaticfinalString TAG ="DeviceReportApplication";/**
     * default false to androidx.work.
     */@OverridepublicbooleanisDeviceProtectedStorage(){returnfalse;}}

因为 WokrManager 内部实现的数据库访问无法修改，所以需要全局访问设备加密存储，有 2 种方式。

可以直接在 Application 标签下声明 defaultToDeviceProtectedStorage

<applicationandroid:name=".DeviceReportApplication"android:directBootAware="true"android:defaultToDeviceProtectedStorage="true"android:label="@string/app_name"android:persistent="true"android:usesCleartextTraffic="true"/>

或者在 Application 中替换全局 Context，修改 attachBaseContext

publicclassDeviceReportApplicationextendsApplication{privatestaticfinalString TAG ="DeviceReportApplication";@OverrideprotectedvoidattachBaseContext(Context base){super.attachBaseContext(base.createDeviceProtectedStorageContext());}/**
     * default false to androidx.work.
     */@OverridepublicbooleanisDeviceProtectedStorage(){returnfalse;}}

相关参考