Flutter请求通知权限弹窗不显示，求替代实现方案

如果用permission_handler没弹出权限请求弹窗，大概率是配置遗漏或版本适配问题，直接调用原生通道（MethodChannel）是最稳妥的替代方案，分Android和iOS分别实现：

Android 端实现 #

• 直接通过原生代码触发通知权限请求或引导至设置页：
  1. 打开Android项目的MainActivity.kt，添加MethodChannel逻辑：

     private val PERMISSION_CHANNEL = "com.your.app/permission"
     
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
         super.configureFlutterEngine(flutterEngine)
         MethodChannel(flutterEngine.dartExecutor.binaryMessenger, PERMISSION_CHANNEL).setMethodCallHandler { call, result ->
             when (call.method) {
                 "requestNotificationPermission" -> {
                     val intent = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                         // Android 13+ 直接跳通知设置页
                         Intent(Settings.ACTION_APP_NOTIFICATION_SETTINGS).apply {
                             putExtra(Settings.EXTRA_APP_PACKAGE, packageName)
                         }
                     } else {
                         // 低版本跳应用详情设置页
                         Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS).apply {
                             data = Uri.fromParts("package", packageName, null)
                         }
                     }
                     startActivity(intent)
                     result.success(true)
                 }
                 else -> result.notImplemented()
             }
         }
     }
     

  2. Dart侧调用该方法：

     import 'package:flutter/services.dart';
     
     static const MethodChannel _permissionChannel = MethodChannel('com.your.app/permission');
     
     Future<void> requestNotificationPermission() async {
         try {
             await _permissionChannel.invokeMethod('requestNotificationPermission');
         } on PlatformException catch (e) {
             print("权限请求失败: ${e.message}");
         }
     }
     

iOS 端实现 #

• 调用iOS原生的UNUserNotificationCenter请求通知权限：
  1. 打开iOS项目的AppDelegate.swift，添加MethodChannel逻辑：

     let PERMISSION_CHANNEL = "com.your.app/permission"
     
     override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         let controller = window?.rootViewController as! FlutterViewController
         let channel = FlutterMethodChannel(name: PERMISSION_CHANNEL, binaryMessenger: controller.binaryMessenger)
         
         channel.setMethodCallHandler { call, result in
             guard call.method == "requestNotificationPermission" else {
                 result(FlutterMethodNotImplemented)
                 return
             }
             
             UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { granted, error in
                 DispatchQueue.main.async {
                     if let error = error {
                         result(FlutterError(code: "PERMISSION_ERROR", message: error.localizedDescription, details: nil))
                     } else {
                         result(granted)
                     }
                 }
             }
         }
         
         GeneratedPluginRegistrant.register(with: self)
         return super.application(application, didFinishLaunchingWithOptions: launchOptions)
     }
     

  2. Dart侧复用上面的requestNotificationPermission方法即可。

关键注意事项 #

• 蓝牙权限需额外配置：Android要在AndroidManifest.xml声明BLUETOOTH_SCAN、BLUETOOTH_CONNECT等权限；iOS要在Info.plist添加NSBluetoothAlwaysUsageDescription或NSBluetoothPeripheralUsageDescription字段并填写权限说明。
• 所有权限必须在对应的配置文件中提前声明，否则系统会直接拒绝请求，不会弹出弹窗。
• Android 13以下版本没有单独的通知权限开关，只能引导用户到应用设置页手动开启通知。

内容的提问来源于stack exchange，提问作者wahyu