成员的完整列表，这些成员属于 com.netease.nimlib.sdk.v2.user.V2NIMUserService,包括所有继承而来的类成员

addUserListener(V2NIMUserListener listener)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
addUserToBlockList(String accountId, V2NIMSuccessCallback< Void > success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
checkBlock(List< String > accountIds, V2NIMSuccessCallback< Map< String, Boolean >> success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
getBlockList(V2NIMSuccessCallback< List< String >> success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
getUserInfo(String accountId)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
getUserList(List< String > accountIds, V2NIMSuccessCallback< List< V2NIMUser >> success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
getUserList(List< String > accountIds)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
getUserListFromCloud(List< String > accountIds, V2NIMSuccessCallback< List< V2NIMUser >> success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
removeUserFromBlockList(String accountId, V2NIMSuccessCallback< Void > success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
removeUserListener(V2NIMUserListener listener)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
searchUserByOption(V2NIMUserSearchOption userSearchOption, V2NIMSuccessCallback< List< V2NIMUser >> success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.user.V2NIMUserService
updateSelfUserProfile(V2NIMUserUpdateParams updateParams, V2NIMSuccessCallback< Void > success, V2NIMFailureCallback failure)	com.netease.nimlib.sdk.v2.user.V2NIMUserService