Flutter_blue: Provide API to check if BLE scan is in progress

[ekuleshov]

Internally _isScanning.value == true is used to check if BLE scan is in progress. Please provide API to do the same check in the app code

[GauravPatni]

you can subscribe to "FlutterBlue.instance.isScanning" stream to get state / change in state .

Refer following code ( from flutter_blue example )

floatingActionButton: StreamBuilder<bool>(
        stream: FlutterBlue.instance.isScanning,
        initialData: false,
        builder: (c, snapshot) {
          if (snapshot.data) {
            return FloatingActionButton(
              child: Icon(Icons.stop),
              onPressed: () => FlutterBlue.instance.stopScan(),
              backgroundColor: Colors.red,
            );
          } else {
            return FloatingActionButton(
                child: Icon(Icons.search),
                onPressed: () => FlutterBlue.instance
                    .startScan(timeout: Duration(seconds: 8)));
          }
        },
      ),

[ekuleshov]

In my case I can't use StreamBuilder and need to check if scan initiated on a previous screen is running when user switched to the next screen

[shinayser]

In my case I can't use StreamBuilder and need to check if scan initiated on a previous screen is running when user switched to the next screen

await FlutterBlue.instance.isScanning.first

[ekuleshov]

In my case I can't use StreamBuilder and need to check if scan initiated on a previous screen is running when user switched to the next screen

await FlutterBlue.instance.isScanning.first

It would be nice an easy if that worked. But that throws a stream state error when no scan is running. Besides, the library internally is using different code to check if scan is running. So, I'm asking to expose the same API to allow library consumers to use