flutter_blue_plus 1.30.0 flutter_blue_plus: ^1.30.0 copied to clipboard
Flutter plugin for connecting and communicationg with Bluetooth Low Energy devices, on Android, iOS, and MacOS.
// Copyright 2017-2023, Charles Weinberger & Paul DeMarco.
// All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_blue_plus/flutter_blue_plus.dart';
import 'screens/bluetooth_off_screen.dart';
import 'screens/scan_screen.dart';
void main() {
FlutterBluePlus.setLogLevel(LogLevel.verbose, color: true);
runApp(const FlutterBlueApp());
}
//
// This widget shows BluetoothOffScreen or
// ScanScreen depending on the adapter state
//
class FlutterBlueApp extends StatefulWidget {
const FlutterBlueApp({Key? key}) : super(key: key);
@override
State<FlutterBlueApp> createState() => _FlutterBlueAppState();
}
class _FlutterBlueAppState extends State<FlutterBlueApp> {
BluetoothAdapterState _adapterState = BluetoothAdapterState.unknown;
late StreamSubscription<BluetoothAdapterState> _adapterStateStateSubscription;
@override
void initState() {
super.initState();
_adapterStateStateSubscription = FlutterBluePlus.adapterState.listen((state) {
_adapterState = state;
setState(() {});
});
}
@override
void dispose() {
_adapterStateStateSubscription.cancel();
super.dispose();
}
@override
Widget build(BuildContext context) {
Widget screen = _adapterState == BluetoothAdapterState.on
? const ScanScreen()
: BluetoothOffScreen(adapterState: _adapterState);
return MaterialApp(
color: Colors.lightBlue,
home: screen,
navigatorObservers: [BluetoothAdapterStateObserver()],
);
}
}
//
// This observer listens for Bluetooth Off and dismisses the DeviceScreen
//
class BluetoothAdapterStateObserver extends NavigatorObserver {
StreamSubscription<BluetoothAdapterState>? _adapterStateSubscription;
@override
void didPush(Route route, Route? previousRoute) {
super.didPush(route, previousRoute);
if (route.settings.name == '/DeviceScreen') {
// Start listening to Bluetooth state changes when a new route is pushed
_adapterStateSubscription ??= FlutterBluePlus.adapterState.listen((state) {
if (state != BluetoothAdapterState.on) {
// Pop the current route if Bluetooth is off
navigator?.pop();
}
});
}
}
@override
void didPop(Route route, Route? previousRoute) {
super.didPop(route, previousRoute);
// Cancel the subscription when the route is popped
_adapterStateSubscription?.cancel();
_adapterStateSubscription = null;
}
}