小贝子编程

如何使用FCM插件正确注册插件



我正在使用https://pub.dev/packages/firebase_messagingv6.0.16和颤振v1.17.5

[√] Flutter (Channel stable, v1.17.5, on Microsoft Windows [Version 10.0.18362.900], locale en-US)

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[√] Android Studio (version 4.0)
[√] VS Code (version 1.47.0)

我正试图在我的myBackgroundMessageHandler中调用一个插件，它显示AppAvailability.launchApp('com.companyname.appname');

class CloudMessagingService extends NotificationService {
final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
void configure() {
if (Platform.isIOS) _firebaseMessaging.requestNotificationPermissions(IosNotificationSettings());
_firebaseMessaging.configure(
onMessage: (Map<String, dynamic> message) async {
if (isDataNotification(message)) return;
print('onMessage');
},
onLaunch: (Map<String, dynamic> message) async {
if (isDataNotification(message)) return;
print('onLaunch');
},
onResume: (Map<String, dynamic> message) async {
if (isDataNotification(message)) return;
print('onResume');
},
onBackgroundMessage: myBackgroundMessageHandler,
);
}
static Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) async {
print('on background message');
AppAvailability.launchApp('com.companyname.appname'); // it will throw an error when it tries to call the method channel in the app availability plugin
return message;
}

但是我得到以下错误

E/flutter (28000): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method launchApp on channel com.pichillilorenzo/flutter_appavailability)
E/flutter (28000): #0      MethodChannel._invokeMethod 
package:flutter/…/services/platform_channel.dart:154
E/flutter (28000): <asynchronous suspension>
E/flutter (28000): #1      MethodChannel.invokeMethod 
package:flutter/…/services/platform_channel.dart:329
E/flutter (28000): #2      AppAvailability.launchApp 
package:flutter_appavailability/flutter_appavailability.dart:95
E/flutter (28000): #3      CloudMessagingService.myBackgroundMessageHandler 
package:moto_picto/…/firebase/cloud_messaging_service.dart:43
E/flutter (28000): #4      _fcmSetupBackgroundChannel.<anonymous closure> 
package:firebase_messaging/firebase_messaging.dart:38
E/flutter (28000): #5      MethodChannel._handleAsMethodCall 
package:flutter/…/services/platform_channel.dart:409
E/flutter (28000): #6      MethodChannel.setMethodCallHandler.<anonymous closure> 
package:flutter/…/services/platform_channel.dart:377
E/flutter (28000): #7      _DefaultBinaryMessenger.handlePlatformMessage 
package:flutter/…/services/binding.dart:199
E/flutter (28000): #8      _invoke3.<anonymous closure>  (dart:ui/hooks.dart:290:15)
E/flutter (28000): #9      _rootRun  (dart:async/zone.dart:1184:13)
E/flutter (28000): #10     _CustomZone.run  (dart:async/zone.dart:1077:19)
E/flutter (28000): #11     _CustomZone.runGuarded  (dart:async/zone.dart:979:7)
E/flutter (28000): #12     _invoke3  (dart:ui/hooks.dart:289:10)
E/flutter (28000): #13     _dispatchPlatformMessage  (dart:ui/hooks.dart:164:5)

插件在应用程序范围内工作时没有任何问题。我尝试过的每个插件都会出现这种情况！

所以我认为问题是FCM制造的隔离物并没有被我从这篇文章中了解到的颤振引擎所包裹。

https://github.com/flutter/flutter/issues/13937#issuecomment-656239596

，但您需要创建一个自定义的应用程序类，该类挂接到插件后台FlutterNativeView的初始化。

我确实按照说明进行了操作，并将Application.kt更改为以下

package com.companyname.appname

import `in`.jvapps.system_alert_window.SystemAlertWindowPlugin
import io.flutter.app.FlutterApplication
import io.flutter.plugin.common.PluginRegistry
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService
import io.flutter.view.FlutterMain
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin
import android.os.Build
import android.app.NotificationManager
import android.app.NotificationChannel
public class Application: FlutterApplication(), PluginRegistrantCallback {
override fun onCreate() {
super.onCreate();
FlutterFirebaseMessagingService.setPluginRegistrant(this);
createNotificationChannels();
SystemAlertWindowPlugin.setPluginRegistrant(this);
FlutterMain.startInitialization(this);
}
override fun registerWith(registry: PluginRegistry) {
if (!registry!!.hasPlugin("io.flutter.plugins.firebasemessaging")) {
FirebaseMessagingPlugin.registerWith(registry!!.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
}
if (!registry!!.hasPlugin("in.jvapps.system_alert_window")) {
SystemAlertWindowPlugin.registerWith(registry!!.registrarFor("in.jvapps.system_alert_window"));
}
}
fun createNotificationChannels() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val name = "groupChannel";
val descriptionText = "This is the group channel";
val importance = NotificationManager.IMPORTANCE_HIGH;
val mChannel = NotificationChannel("59054", name, importance);
mChannel.description = descriptionText;
val notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager;
notificationManager.createNotificationChannel(mChannel);
}
}
}

和我的MainActivity.kt

package com.companyname.appname
import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.GeneratedPluginRegistrant
class MainActivity: FlutterActivity() {
override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine);
}
}

和我的AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.companyname.appname">
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE " />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<!-- io.flutter.app.FlutterApplication is an android.app.Application that
calls FlutterMain.startInitialization(this); in its onCreate method.
In most cases you can leave this as-is, but you if you want to provide
additional functionality it is fine to subclass or reimplement
FlutterApplication and put your custom class here. -->
<application
android:name=".Application"
android:label="App Name"
android:icon="@mipmap/ic_launcher">
<activity
android:name=".MainActivity"
android:launchMode="singleTop"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<intent-filter>
<action android:name="FLUTTER_NOTIFICATION_CLICK" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.yalantis.ucrop.UCropActivity"
android:screenOrientation="portrait"
android:theme="@style/Theme.AppCompat.Light.NoActionBar"/>
<!-- Don't delete the meta-data below.
This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
<meta-data
android:name="flutterEmbedding"
android:value="2" />
<meta-data
android:name="com.google.firebase.messaging.default_notification_channel_id"
android:value="@string/default_notification_channel_id"/>  
</application>
</manifest>

通知似乎正确地显示为提醒通知，我可以调用我的BackgroundMessageHandler并执行代码，只是我不能对myBackgroundMessageHandler中的任何插件做任何事情。我是否正确执行了它？

它将始终在myBackgroundMessageHandler中的AppAvailability.launchApp('com.companyname.appname');行抛出错误，因为如果插件未注册，则隔离无法调用方法通道。

我也检查了这个github后

类似问题

但我的Application.kt是这样设置的

我试着做扑动清洁->卸载应用程序->同时安装应用程序。问题依然存在。就像他们在这里描述的

MissingPluginException(在channel-deflexican.com/flutter/local_notifications上未找到方法显示的实现(

编辑：当我使用DeviceApp插件时，同样的事情也会发生。我更换了

AppAvailability.launchApp('com.companyname.appname');

带有

DeviceApps.openApp('com.companyname.appname');

因此，我在Application.kt的registerWith方法中添加了以下2行，它似乎围绕着缺失的插件异常

if (!registry!!.hasPlugin("fr.g123k.deviceapps")) {
DeviceAppsPlugin.registerWith(registry!!.registrarFor("fr.g123k.deviceapps"));
}

但错误变为

E/flutter (25583): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(error, Attempt to invoke virtual method 'android.content.pm.PackageManager android.app.Activity.getPackageManager()' on a null object reference, null)
E/flutter (25583): #0      StandardMethodCodec.decodeEnvelope 
package:flutter/…/services/message_codecs.dart:569
E/flutter (25583): #1      MethodChannel._invokeMethod 
package:flutter/…/services/platform_channel.dart:156
E/flutter (25583): <asynchronous suspension>
E/flutter (25583): #2      MethodChannel.invokeMethod 
package:flutter/…/services/platform_channel.dart:329
E/flutter (25583): #3      DeviceApps.openApp 
package:device_apps/device_apps.dart:81
E/flutter (25583): #4      CloudMessagingService.myBackgroundMessageHandler 
package:moto_picto/…/firebase/cloud_messaging_service.dart:73
E/flutter (25583): #5      _fcmSetupBackgroundChannel.<anonymous closure> 
package:firebase_messaging/firebase_messaging.dart:38
E/flutter (25583): #6      MethodChannel._handleAsMethodCall 
package:flutter/…/services/platform_channel.dart:409
E/flutter (25583): #7      MethodChannel.setMethodCallHandler.<anonymous closure> 
package:flutter/…/services/platform_channel.dart:377
E/flutter (25583): #8      _DefaultBinaryMessenger.handlePlatformMessage 
package:flutter/…/services/binding.dart:199
E/flutter (25583): #9      _invoke3.<anonymous closure>  (dart:ui/hooks.dart:290:15)
E/flutter (25583): #10     _rootRun  (dart:async/zone.dart:1184:13)
E/flutter (25583): #11     _CustomZone.run  (dart:async/zone.dart:1077:19)
E/flutter (25583): #12     _CustomZone.runGuarded  (dart:async/zone.dart:979:7)
E/flutter (25583): #13     _invoke3  (dart:ui/hooks.dart:289:10)
E/flutter (25583): #14     _dispatchPlatformMessage  (dart:ui/hooks.dart:164:5)

所以现在它不再说插件丢失，而是说PlatformException(error, Attempt to invoke virtual method 'android.content.pm.PackageManager android.app.Activity.getPackageManager()

编辑2:

我刚刚注意到最近的错误https://github.com/g123k/flutter_plugin_device_apps/issues/31可能是插件本身的一部分。去看看不同的插件现在是否工作

我希望我提供了足够的信息，如果需要更多信息或问题需要修改，请告诉我。我可以在几分钟内回复。

原来它只是我第一次编辑后的插件！只需在共享偏好的情况下尝试一下，就可以了！

MY_PACKAGE_NAME
import `in`.jvapps.system_alert_window.SystemAlertWindowPlugin
import fr.g123k.deviceapps.DeviceAppsPlugin
import io.flutter.app.FlutterApplication
import io.flutter.plugin.common.PluginRegistry
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin
import io.flutter.view.FlutterMain
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService
import io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin
import android.os.Build
import android.app.NotificationManager
import android.app.NotificationChannel
public class Application: FlutterApplication(), PluginRegistrantCallback {
override fun onCreate() {
super.onCreate();
FlutterFirebaseMessagingService.setPluginRegistrant(this);
SystemAlertWindowPlugin.setPluginRegistrant(this);
createNotificationChannels();
FlutterMain.startInitialization(this);
}
override fun registerWith(registry: PluginRegistry?) {
if (!registry!!.hasPlugin("io.flutter.plugins.firebasemessaging")) {
FirebaseMessagingPlugin.registerWith(registry!!.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
}
if (!registry!!.hasPlugin("in.jvapps.system_alert_window")) {
SystemAlertWindowPlugin.registerWith(registry!!.registrarFor("in.jvapps.system_alert_window"));
}
if (!registry!!.hasPlugin("plugins.flutter.io.shared_preferences")) {
SharedPreferencesPlugin.registerWith(registry!!.registrarFor("plugins.flutter.io.shared_preferences"));
}
}
fun createNotificationChannels() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val name = "groupChannel";
val descriptionText = "This is the group channel";
val importance = NotificationManager.IMPORTANCE_HIGH;
val mChannel = NotificationChannel("59054", name, importance);
mChannel.description = descriptionText;
val notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager;
notificationManager.createNotificationChannel(mChannel);
}
}
}

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