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;