SystemCallbackInterface 接口定义在头文件中,定义了四个public的函数
frameworks/av/services/mediaresourcemanager/ResourceManagerService.h
class ResourceManagerService : public BnResourceManagerService {
public:
struct SystemCallbackInterface : 
SystemCallbackInterface 接口定义在头文件中,定义了四个public的函数
frameworks/av/services/mediaresourcemanager/ResourceManagerService.h
class ResourceManagerService : public BnResourceManagerService {
public:
struct SystemCallbackInterface :