Flutter Bloc package，当本机代码从 ZBB14127678960FAE97D873 调用方法时产生 state

Question

In my bloc I have 2 streams. One is the mapEventToState where I can yield states, and I created a second one which is called from a function which is called by native code.

The call:

checkStatus(_internalState).listen((data){});

The Stream:

Stream<VpnConnectionState> checkStatus(_internalState) async * {
switch (_internalState) {
  case state.down:
    yield down();
    break;
  case state.up:
    yield up();
    break;
}
_previousState = _internalState;
}

The problem is when I yield something in the checkSatus stream, is not arriving in my BlocBuilder. If is called from the stream mapEventToState is working.

Answer 1

These are completely different streams. Your BlocBuilder is listening to your mapEventToState stream not for your checkStatus . Dispatch (or add in the latest version) event from your checkStatus stream to your block and then yield new state in mapEventToState when responding to those events.

Or even get rid of your checkStatus stream for simplicity like here:

void checkStatus(_internalState) {
switch (_internalState) {
  case state.down:
     dispatch(DownEvent());
    break;
  case state.up:
    dispatch(UpEvent());
    break;
}
_previousState = _internalState;
}

void mapEventToSteam(Event event) {
    if(event is DownEvent) {
     yield DownState()
   }
    if(event is UpEvent) {
     yield UpState()
   }