我需要有关解释的帮助为什么我们在同步适配器服务类中使用单例对象privatestaticSyncAdaptersSyncAdapter=null;privatestaticfinalObjectsSyncAdapterLock=newObject();@OverridepublicvoidonCreate(){synchronized(sSyncAdapterLock){if(sSyncAdapter==null){sSyncAdapter=newSyncAdapter(getApplicationContext(),true);}}}看答案因为该框架仅与一个SyncAdapter一起使用：同