Flutter后台运行时调用network_info_plus获取WiFi信息返回null

我已添加获取WiFi名称及实现后台运行的相关依赖，应用后台运行状态正常，但在后台调用获取WiFi名称的接口时返回null，前台运行时则能正常获取到WiFi名称。

相关代码如下：

import 'package:awesome_notifications/awesome_notifications.dart';
import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:network_info_plus/network_info_plus.dart';
import 'package:flutter_background_service/flutter_background_service.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart ';

Future<void> initializeService() async {
  await flutterLocalNotificationsPlugin.initialize(const InitializationSettings(
      android: AndroidInitializationSettings('ic_launcher')));

  var service = FlutterBackgroundService();
  if (Platform.isIOS) {
    await flutterLocalNotificationsPlugin.initialize(
        const InitializationSettings(iOS: DarwinInitializationSettings()));
  }

  if (Platform.isAndroid) {
    final androidInfo = await deviceInfo.getWifiName();
    log("androidInfo=======================>$androidInfo");
  }

  await flutterLocalNotificationsPlugin
      .resolvePlatformSpecificImplementation<
          AndroidFlutterLocalNotificationsPlugin>()
      ?.createNotificationChannel(notificationChannel);

  await service.configure(
      iosConfiguration:
          IosConfiguration(onBackground: iosBackground, onForeground: onStart),
      androidConfiguration: AndroidConfiguration(
          onStart: onStart,
          autoStart: true,
          notificationChannelId: "Foreground Service",
          isForegroundMode: true,
          initialNotificationTitle: "Foreground Service Running0..",
          foregroundServiceNotificationId: 90));
  service.startService();
}

@pragma("vm:entry-point")
void onStart(ServiceInstance service) {
  service.on("setAsForeground").listen((event) {
    log("Foreground=======================>");
  });

  service.on("setAsBackground").listen((event) {
    log("Background=======================>");
  });

  service.on("stopService").listen((event) {
    service.stopSelf();
  });

  Timer.periodic(const Duration(seconds: 4), (timer) async {
    final info = NetworkInfo();

    // var storedWIFI = '"AndroidWifi"';
    String storedWIFI = '"JioFiber_5G"';

    Connectivity()
        .onConnectivityChanged
        .listen((ConnectivityResult result) async {
      log("onConnectivityChanged===00001===============>$result");

      if (result == ConnectivityResult.wifi) {
        var wifiName = await info.getWifiName();

        log("wifiName=====B4 condition===========$storedWIFI=========>$wifiName");

        if (storedWIFI == wifiName) {
          AwesomeNotifications().createNotification(
            content: NotificationContent(
              id: 10,
              channelKey: 'general_notification',
              title: 'You are connected to $wifiName',
              body: 'You have checked in.',
              notificationLayout: NotificationLayout.BigText,
            ),
          );
        }
      }
    });

    flutterLocalNotificationsPlugin.show(
        90,
        "Cool Service",
        "Awesom ${DateTime.now()}",
        const NotificationDetails(
            android: AndroidNotificationDetails(
                "Foreground Service", "Foreground Service Running0..",
                ongoing: true)));
  });
}

解决方案 #

只需在AndroidManifest.xml文件中添加以下权限即可解决：

<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

内容的提问来源于stack exchange，提问作者Pradip Ninawe