flutter - flutter 支持的外部键盘

Question

如何在没有文本字段的情况下从外部键盘收集字符并附加到 var？我正在尝试将蓝牙/USB 条形码扫描仪设置为在扫描时自动扫描某些内容，但不是您必须单击一个字段(或查看一个字段)并有一个信用卡读卡器在后台自动执行所有操作..

Answer 1

RawKeyboardListener 允许这样做 https://docs.flutter.io/flutter/widgets/RawKeyboardListener-class.html

  var _focusNode = FocusNode();

  @override
  Widget build(BuildContext context) {

    return RawKeyboardListener(
        child: Text('raw keyboard input'),
        focusNode: _focusNode,
        onKey: _onRawKeyEvent,
      );
  }

  void _onRawKeyEvent(RawKeyEvent event) {
    ..
  }