initCallEngine method
Implementation
Future<TUIActionCallback> initCallEngine(int sdkAppId, String userId, String userSig) {
Completer<TUIActionCallback> completer = Completer();
String userData = Tools.generateUserData("Call_initCallEngine");
_actionCallback2Future(userData, completer);
final params = [sdkAppId, userId, userSig];
_callEngineSDK.Dart_CallEngineCallAPI(
'login'.toNativeUtf8().cast(),
jsonEncode(params).toNativeUtf8().cast(),
userData.toNativeUtf8().cast());
_callEngineSDK.Dart_CallEngineCallAPI(
'addObserver'.toNativeUtf8().cast(),
jsonEncode([]).toNativeUtf8().cast(),
userData.toNativeUtf8().cast());
return completer.future;
}