# TRTCParams constructor Null safety

TRTCParams(

1. {int sdkAppId = 0,
2. String userId = "",
3. String userSig = "",
4. int roomId = 0,
5. String strRoomId = "",
6. int role = TRTCCloudDef.TRTCRoleAnchor,
7. String streamId = "",
8. String userDefineRecordId = "",
9. String privateMapKey = "",
10. String businessInfo = ""}

)

## Implementation

    TRTCParams(
        {this.sdkAppId = 0,
        this.userId = "",
        this.userSig = "",
        this.roomId = 0,
        this.strRoomId = "",
        this.role = TRTCCloudDef.TRTCRoleAnchor,
        this.streamId = "",
        this.userDefineRecordId = "",
        this.privateMapKey = "",
        this.businessInfo = ""});