Flutter：如何将条码扫描值传递到 TextFormField

Question

I want to pass the Barcode scan value into the Serial Number that in the TextFromField. Is there any way to do it? Please help me to fix it out.

class Scan extends StatefulWidget {
  @override
  _ScanState createState() => _ScanState();
}

class _ScanState extends State<Scan> {
  String _data = "";

  _scan() async {
    await FlutterBarcodeScanner.scanBarcode(
            '#000000', 'Cancel', true, ScanMode.BARCODE)
        .then((value) => setState(() => _data = value));
  }

  final _formKey = GlobalKey<FormState>();
 @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: AppBar(
        title: Text('Maintenance Log'),
      ),
      body: Card(
        child: Padding(
          padding: EdgeInsets.all(8.0),
          child: Form(
            key: _formKey,
            child: Column(
              children: <Widget>[
                Row(
                  children: <Widget>[
                    Text(_data),
                    Container(
                      width: 200.0,
                      child: TextFormField(
                        decoration: InputDecoration(hintText: 'Serial Number'),
                        validator: (val) {
                          if (val.length == 0) {
                            return "S/N is Required";
                          } else {
                            return null;
                          }
                        },
                      ),
                    ),
                    Spacer(),
                    RaisedButton(
                      child: Text('Scan Barcode'),
                      onPressed: () => _scan(),
                    ),
                    Spacer(flex: 2),
                  ],
                ),
                
                

Thank you for your help. :D PS I am a student who is starting to write apps as a project. This is my first app.

Answer 1

Add a TextFormFieldController, add the controller to the textformfield. then booom!!

_scan() async {
    await FlutterBarcodeScanner.scanBarcode(
            '#000000', 'Cancel', true, ScanMode.BARCODE)
        .then((value) => setState(() => textFormFieldController.text = value));
  }

this will do it:)