当我们卸载应用程序并首次加载时，notificationiotn正在工作，但之后它显示此错误
java.lang.RuntimeException：无法创建服务io.flutter.plugins.firebaseessaging.FlutterfirebaseMessaging服务：java.lang.ClassCastException：io.flutter.app.FlutterPluginRegistry无法强制转换为io.flutter.embedding.engine.FlutterEngine在android.app.ActivityThread.handleCreateService(ActivityThreads.java:3976)在android.app.ActivityThread.-wra5(未知来源：0)在android.app.ActivityThread$H.handleMessage(ActivityThreads.java:2109)在android.os.Handler.dispatchMessage(Handler.java:109)在android.os.Looper.loop(Looper.java:166)在android.app.ActivityThread.main(ActivityThreads.java：7555)位于java.lang.reflect.Method.ioke(本机方法)网址：com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:469)网址：com.android.internal.os.ZygoteInit.main(ZygoteNit.java:963)由以下原因引起：java.lang.ClassCastException：io.flutter.app.FlutterPluginRegistry无法强制转换为io.flutter.embedding.engine.FlutterEngine网址：com.midhilaj.aquarium_shop.Application.registerWith(Application.java:25)位于io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.startBackgroundIsolate(FlutterFireBaseMessagingServices.java:164)位于io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.onCreate(FlutterFireBaseMessagingServices.java:77)在android.app.ActivityThread.handleCreateService(ActivityThreads.java:3956)在android.app.ActivityThread.-wra5(未知来源：0)在android.app.ActivityThread$H.handleMessage(ActivityThreads.java:2109)在android.os.Handler.dispatchMessage(Handler.java:109)在android.os.Looper.loop(Looper.java:166)在android.app.ActivityThread.main(ActivityThreads.java：7555)位于java.lang.reflect.Method.ioke(本机方法)网址：com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:469)网址：com.android.internal.os.ZygoteInit.main(ZygoteNit.java:963)
D/FlutterActivity(3682)：使用启动主题作为正常主题。D/FlutterActivityAndFragmentDelegate(3682)：设置FlutterEngine。D/FlutterActivityAndFragmentDelegate(3682)：无首选提供了FlutterEngine。为此创建一个新的FlutterEngineFlutterFragment。D/FlutterActivity AndFragmentDelegate(3682)：将FlutterEngine附加到拥有此片段的活动。D/FlutterView(3682)：从FlutterEngine分离：nullD/FlutterView(3682)：未连接到发动机上。无所事事。D/FlutterView(3682)：连接到FlutterEngine：io.flutter.embedding.engine.FlutterEngine@54b88a0D/FlutterActivityAndFragmentDelegate(3682)：执行飞镖入口点：main，并发送初始路由：/将文件同步到设备DUB LX1…I/flutter(3682)：-----=--令牌：db37iEIOPw2r5Y9LpYpXz-HV/FA(3682)：不活动，断开与服务的连接I/flutter(3682)：e222banner1=>｛actionPage:null，buttonLabel:null，buttonLabelAr:null，img：https://firebasestorage.googleapis.com/，subTitle:null，subTitleAr:null，title：金色FIsh，title Ar:null｝I/flutter(3682):getMyCart fn I/flutterhttps://firebasestorage.googleapis.com/，subTitle:null，subTitleAr:null，title：金色FIsh，title Ar:null｝I/flutter(3682)：获取MyCart用户6AiQ2pG8nsaskpcUbbyJM7eCPuR2D/ConnectivityManager(3682)：requestNetwork，调用应用程序为：com.midhilaj.aquarium_shop W/动态模块(3682)：本地模块找不到providerinstaller的描述符类。I/DynamiteModule(3682)：考虑本地模块提供程序安装程序：0和远程模块providerinstaller:0 W/providerinstaller(3682)：未能加载providerinstaller模块：找不到可接受的模块。本地版本为0，远程版本为0。D/HwFLClassLoader(3682)：USE_FEATURE_LIST没有初始化！W/合子64(3682)：ClassLoaderContext类路径大小位置0不匹配。预期=0，实际=1(PCL[]|PCL[/system/framework.com/android.media.remoteddisplay.jar*818632460])V/NativeCrypto(3682)：正在注册com/google/android/gms.org/conscrypt/NativeCrypto的286原生方法。。。D/NetworkSecurityConfig(3682)：无网络安全配置指定，使用平台默认I/ProviderInstaller(3682)：已安装默认安全提供程序GmsCore_OpenSSLD/ConnectivityManager(3682)：requestNetwork，调用应用程序为：com.midhilaj.aquarium_shop I/合子64(3682)：执行部分代码缓存集合，代码=60KB，数据=46KB I/合子64(3682)：在代码缓存之后collection，code=60KB，data=46KB I/合子64(3682)：递增代码缓存容量达到256KB I/合子64(3682)：正在启动配置文件保护程序IsSaveProfileNow结束。I/flutter(3682)：快照为空D/AndroidRuntime(3682)：关闭VM E/AndroidRuntime致命异常：主E/AndroidRuntime(3682)：进程：com.midhilaj.aquarium_shop，PID:382 E/AndroidRuntime(3682)：java.lang.RuntimeException：无法创建服务io.flutter.plugins.firebaseessaging.FlutterfirebaseMessaging服务：java.lang.ClassCastException：io.flutter.app.FlutterPluginRegistry无法强制转换为io.flutter.embedding.engine.FlutterEngineE/AndroidRuntime(3682)：位于android.app.ActivityThread.handleCreateService(ActivityThreads.java:3976)E/AndroidRuntime(3682)：在android.app.ActivityThread.-wra5(未知来源：0)E/AndroidRuntime(3682)：位于android.app.ActivityThread$H.handleMessage(ActivityThreads.java:2109)E/AndroidRuntime(3682)：位于android.os.Handler.dispatchMessage(Handler.java:109)E/AndroidRuntime(3682)：在android.os.Looper.loop(Looper.java:166)E/AndroidRuntime(3682)：在android.app.ActivityThread.main上(ActivityThreads.java：7555)E/AndroidRuntime(3682)：位于java.lang.reflect.Method.ioke(Native方法)E/AndroidRuntime(3682)：在com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:469)E/AndroidRuntime(3682)：位于com.android.internal.os.ZygoteInit.main(ZygoteNit.java:963)E/AndroidRuntime(3682)：由java.lang.ClassCastException引起：io.flutter.app.FlutterPluginRegistry无法强制转换为io.flutter.embedding.engine.FlutterEngine E/AndroidRuntime(3682)：位于com.midhilaj.aquarium_shop.Application.registerWith(Application.java:25)E/AndroidRuntime(3682)：位于io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.startBackgroundIsolate(FlutterFireBaseMessagingServices.java:164)E/AndroidRuntime(3682)：位于io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.onCreate(FlutterFireBaseMessagingServices.java:77)E/AndroidRuntime(3682)：位于android.app.ActivityThread.handleCreateService(ActivityThreads.java:3956)E/AndroidRuntime(3682)：。。。8个I/O进程(3682)：发送信号PID:382 SIG:9与设备的连接丢失。
import io.flutter.app.FlutterApplication;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback;
import io.flutter.app.FlutterApplication;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback;
import io.flutter.plugins.GeneratedPluginRegistrant;
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;
public class Application extends FlutterApplication implements PluginRegistrantCallback {
FlutterEngine fe;
@Override
public void onCreate() {
super.onCreate();
FlutterFirebaseMessagingService.setPluginRegistrant(this);
}
@Override
public void registerWith(PluginRegistry registry) {
GeneratedPluginRegistrant.registerWith((FlutterEngine) registry);
}
}
以这种方式使用FlutterEngine
它解决了我的问题
GeneratedPluginRegistrant.registerWith(FlutterEngine(applicationContext));
我浏览了无数的帖子和答案，直到我看到这个：迁移指南这是新的flutter版本的迁移指南。我的选择是
新的FlutterActivity/Flutter应用程序不再需要手动注册您的插件。当将创建基础FlutterEngine。
override fun registerWith(registry: PluginRegistry) {
// comment the below methods out or remove the method
// GeneratedPluginRegistrant.registerWith(FlutterEngine(applicationContext));
// GeneratedPluginRegistrant.registerWith((registry as FlutterEngine?)!!)
}