flutter_tracker/lib/pages/bluetooth_off_page.dart

import 'package:flutter/material.dart';
import 'package:flutter_blue/flutter_blue.dart';

class BluetoothOffPage extends StatelessWidget {
  final BluetoothState state;

 BluetoothOffPage({Key? key, required BluetoothState this.state}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.blue,
      child: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            const Icon(
              Icons.bluetooth_disabled,
              size: 200.0,
              color: Colors.white54,
            ),
            Text(
              '蓝牙适配器： ${state != null ? state.toString().substring(15) : '不可用'}.',
            ),
          ],
        ),
      ),
    );
  }
}