#### 本章主要內容： - 介紹ContentService - 介紹AccountManagerService #### 本章所涉及的源代碼文件名及位置： - SystemServer.java `frameworks/base/services/java/com/android/server/SystemServer.java` - ContentService.java `frameworks/base/core/java/android/content/ContentService.java` - ContentResolver.java `frameworks/base/core/java/android/content/ContentResolver.java` - UsbSettings.java `packages/apps/Settings/src/com/android/settings/deviceinfo/UsbSettings.java` - DevelopmentSettings.java `packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java` - UsbDeviceManager.java `frameworks/base/services/java/com/android/server/usb/UsbDeviceManager.java` - AccountManagerService.java `frameworks/base/core/java/android/accounts/AccountManagerService.java` - AccountAuthenticatorCache.java `frameworks/base/core/java/android/accounts/AccountAuthenticatorCache.java` - RegisteredServicesCache.java `frameworks/base/core/java/android/content/pm/RegisteredServicesCache.java` - AccountManager.java `frameworks/base/core/java/android/accounts/AccountManager.java` - EasAuthenticatorService `packages/apps/Email/src/com/android/email/service/EasAuthenticatorService.java` - SyncManager.java `frameworks/base/core/java/android/content/SyncManager.java` - SyncStorageEngine.java `frameworks/base/core/java/android/content/SyncStorageEngine.java` - SyncAdapterCache.java `frameworks/base/core/java/android/content/SyncAdapterCache.java` - SyncQueue.java `frameworks/base/core/java/android/content/SyncQueue.java` - EmailSyncAdapterService.java `packages/apps/Exchange/src/com/android/exchange/EmailSyncAdapterService.java` - AbstractThreadedSyncAdapter.java `frameworks/base/core/java/android/content/AbstractThreadedSyncAdapter.java`