const String kChannelBaseName = 'com.czg.cashier_reserve/'; const String kGetCallLog = 'getCallLog'; const String kCallLogCallback = 'callLogCallback'; const String kCallStatusChange = 'callStatusChange'; const String kAcceptCall = 'acceptCall'; const String kEndCall = 'endCall'; const String kRejectCall = 'rejectCall'; String getChannelName(name) { return kChannelBaseName + name; }