如何关闭账号自动同步？

1.修改frameworks/base/core/res/res/values/config.xml中的    config_syncstorageengine_masterSyncAutomatically变量，将默认值改为false。2.修改frameworks/base/services/core/java/com/android/server/content/SyncStorageEngine.java中-     mMasterSyncAutomatically.put(0, listen == null || Boolean.parseBoolean(listen));+     //mMasterSyncAutomatically.put(0, listen == null || Boolean.parseBoolean(listen));      eventType = parser.next();      AuthorityInfo authority = null;      PeriodicSync periodicSync = null;