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)
我正在尝试调用myBackgroundMessageHandler中的一个插件,它的代码是AppAvailability。启动应用程序('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没有任何问题。这是发生在我尝试的每一个插件!
所以我认为问题在于FCM所做的隔离并没有用颤振引擎来包装,我从这篇文章中了解到了这一点。
https://github.com/flutter/flutter/issues/13937#issuecomment-656239596
但是您需要创建一个自定义应用程序类,该类与插件的后台视图的初始化挂钩。
我确实按照指示更改了我的申请。kt至以下各项:
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);
}
}
}
还有我的主要活动。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);
}
}
还有我的机器人。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>
这些通知似乎正确地显示为提示通知,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。我是否正确地实施了它?
它将始终在这一行AppAvailability上抛出错误。启动应用程序('com.companyname.appname')
myBackgroundMessageHandler
中的code>,因为如果插件未注册,则隔离方法无法调用方法通道。
我还查看了这篇github帖子
类似的问题
但是我的申请。kt是这样设置的吗
我试着把颤振清理干净-
缺少插件异常(在通道dexterous.com/flutter/local_notifications上没有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。我换了
AppAvailability.launchApp('com.companyname.appname');
具有
DeviceApps.openApp('com.companyname.appname');
因此,我使用应用程序方法向registerWith添加了以下两行。kt,它似乎扭转了缺少的插件异常
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,而是说平台异常(错误,尝试调用虚拟方法android.content.pm.PackageManagerandroid.app.ctivity.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。看看不同的插件现在是否可以工作
我希望我提供了足够的信息,请让我知道是否需要更多的信息,或者如果问题需要修改。我可以在几分钟内回复。
原来这只是我第一次编辑后的插件!只是用共享的首选项尝试了一下,效果很好!
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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