未在通道 plugins.flutter.io/path_provider 上找到方法 getApplicationDocumentsDirectory 的实现
No implementation found for method getApplicationDocumentsDirectory on channel plugins.flutter.io/path_provider
我的 Flutter 应用程序在初始屏幕上冻结，我收到以下错误日志：
Built build\app\outputs\apk\debug\app-debug.apk.
I/Choreographer(18870): Skipped 75 frames! The application may be doing too much work on its main thread.
D/EGL_emulation(18870): eglMakeCurrent: 0xe8885480: ver 3 0 (tinfo 0xe88835a0)
I/OpenGLRenderer(18870): Davey! duration=2142ms; Flags=1, IntendedVsync=65263803118670, Vsync=65265053118620, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=65265065657900, AnimationStart=65265065738100, PerformTraversalsStart=65265065780200, DrawStart=65265126086300, SyncQueued=65265197367200, SyncStart=65265199471900, IssueDrawCommandsStart=65265199680700, SwapBuffers=65265651453000, FrameCompleted=65265947767800, DequeueBufferDuration=12659000, QueueBufferDuration=920000,
Syncing files to device Android SDK built for x86...
E/flutter (18870): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: MissingPluginException(No implementation found for method getApplicationDocumentsDirectory on channel plugins.flutter.io/path_provider)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:7)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #1 getApplicationDocumentsDirectory (package:path_provider/path_provider.dart:84:22)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #2 DbContext.initDb (package:appentrega/database.dart:34:45)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #3 DbContext.getContext (package:appentrega/database.dart:27:21)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #4 _SplashScreenState.startTime (package:appentrega/splash.dart:16:34)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #5 _SplashScreenState.initState (package:appentrega/splash.dart:33:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #6 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4068:58)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #7 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #8 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #9 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #10 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #11 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #12 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #13 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #14 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #15 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #16 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #17 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #18 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #19 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #20 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #21 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #22 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #23 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #24 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #25 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #26 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #27 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #28 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #29 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #30 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #31 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #32 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #33 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #34 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #35 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #36 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #37 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #38 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #39 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #40 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #41 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #42 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #43 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #44
Syncing files to device Android SDK built for x86...
D/EGL_emulation(18870): eglMakeCurrent: 0xe8885720: ver 3 0 (tinfo 0xe88832f0)
Syncing files to device Android SDK built for x86...
4.034ms (!)
看起来问题出在这里：
[错误：flutter/lib/ui/ui_dart_state.cc(148)] 未处理的异常：MissingPluginException（未在通道 plugins.flutter.io/path_provider 上找到方法 getApplicationDocumentsDirectory 的实现）
已经完成：
-删除所有插件并重新安装flutter pub get。
-运行了 flutter clean 和 flutter run
此错误通常发生在您获得插件但未再次构建应用程序时。如果在 pubspec.yaml 上安装插件后出现这种情况，请重新安装您的 apk。如果这不是您的问题，您是否创建了支持 kotlin 和 swift 的项目？我不知道是不是这种情况，但大多数插件都需要这个
原来我不得不退出 flutter 运行 进程并重新启动它。只是在 flutter 运行 中完全重启没有用。
这里有一个link供参考https://github.com/flutter/flutter/issues/10912
编辑：确保导入这些包；
- 包：path_provider/path_provider.dart
- 飞镖：io
- 飞镖：异步
在我的例子中是为了缓存，我删除了 cached_network_image 并将其替换为 Image.network，问题消失了
就我而言，我没有包含 dart:async 包。 运行“flutter 运行”并包含“dart:async”包解决了问题
在构建发布 apk 后，我在另一个插件上遇到了这个错误，
这是因为默认情况下启用代码收缩 - 如果您不想 minify/obfuscate 代码，只需在 android/app/build.gradle.
中添加两行
android {
...
buildTypes {
release {
...
shrinkResources false
minifyEnabled false
}
}
}
就我而言，我的 AndroidManifest.xml 文件中缺少以下代码段。
<meta-data
android:name="flutterEmbedding"
android:value="2" />
将其添加到 AndroidManifest.xml 文件中解决了问题。
Upgrading-pre-1.12-Android-projects之后!!
如果您没有太多时间尝试编辑步骤 5AppDelegate.h
我按照指南更新后通过了：Upgrading-pre-1.12-Android-projects 应用以下操作：
将 flutter 更新到最新的稳定版本 -> flutter clean 丢失
更新你所有的依赖（很可能是packages有或者要求你添加新的方法）-> flutter clean不过分
更新包更新产生的代码和方法
尝试 flutter 运行 或从 android Studio |>（某些软件包可能会向您发送 missingPluginException 但如果它安装在移动设备上）转到第 5 步。
如果可以的话，为 android 和 IOS 构建测试安装（它们应该可以正常工作）。
很可能在使用 flutter 运行 进行开发时它会继续发送错误，在我的情况下我无法在 IOS 中进行测试，但是对于 flutter 运行 它 运行s 运行s android 和 IOS 并通过将其添加到 ios / Runner / AppDelegate.h ->[GeneratedPluginRegistrant registerWithRegistry: self];
来解决问题
#import <颤动/Flutter.h>
#import
@interface AppDelegate：FlutterAppDelegate
[GeneratedPluginRegistrant registerWithRegistry: self];
@EnD
如果在这些步骤之后无法在步骤 4 0 5 中执行，请验证其他依赖项是否未更新其版本以与 Upgrading-pre-1.12-Android-projects ! 兼容。例如 cached_network_image 使用 path_provider 尝试卸载 cached_network_image 包
再次从第 4 步开始重复。
Web 版 Flutter
我 运行 在开始向应用程序添加 Web 支持后进入此状态。 getApplicationDocumentsDirectory() 函数仅支持 iOS 和 Android (docs)。我添加了一个 web 检查并更改了我设置目录的方式，这为我修复了“未找到方法的实现”。
判断平台是否为 web 使用 Flutter 的 kIsWeb：
import 'package:flutter/foundation.dart' show kIsWeb;
然后相应地处理设置目录：
if (kIsWeb) {
// Set web-specific directory
} else {
appDocumentDirectory = await path_provider.getApplicationDocumentsDirectory();
}
对我有用的是在Application.java（或Application.kt）中注册相应的插件方法通道。所以是这样的：
package com.example.lifely;
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.pathprovider.PathProviderPlugin;
public class Application extends FlutterApplication implements PluginRegistrantCallback {
@Override
public void registerWith(PluginRegistry registry) {
PathProviderPlugin.registerWith(registry.registrarFor("io.flutter.plugins.pathprovider.PathProviderPlugin"));
}
}
您只需要重新安装应用程序
或
您可以使用 https://pub.dev/packages/permission_handler 运行时
管理权限
通常，当您在 AndroidManifest.xml 文件中提到权限时，它会在应用程序首次启动时请求权限，这就是为什么您需要重新安装应用程序或从权限管理器授予权限，或者您可以从您的应用程序动态使用以上套餐
如果你的包依赖于flutter_facebook_auth, you need to make sure you have performed the setup for Android和iOS来摆脱这个错误。我正在使用 Hive 和 Facebook 登录，令人惊讶的是，缺少 Facebook 设置导致 Hive.initFlutter() 抛出此错误。
即使您实际上没有在您的 Facebook 开发者帐户上设置 Facebook 应用程序，此修复程序仍然有效。
在 Flutter MacOS 桌面应用程序 上使用 cached_network_image 时出现此错误 - 认为这是由 2.0. path_provider 包的 0 个更新：
我认为是因为 cached_network_image 使用的 path_provider 函数 (getTemporaryDirectory()) 没有在桌面上定义路径，这导致它抛出错误。
为了解决这个问题（在我的例子中），我导入了 path_provider_macos 包（https://pub.dev/packages/path_provider_macos）并在我的应用程序启动之前在 main 中注册了它。
void main() {
PathProviderMacOS.registerWith();
runApp(MyApp());
}
我还没有测试过其他平台，但是存在 linux (https://pub.dev/packages/path_provider_linux) and windows (https://pub.dev/packages/path_provider_windows) 的软件包，所以应该也能解决这些平台上的问题。
由于 Flutter 团队正在 Dart plugin registration doesn't run in background isolates #98591 中采用 in-package 平台通道在更多的 1P 插件中，这需要注册 Dart 插件，因此插件在 Isolates 中无法使用框，完成后工作仍在进行中你需要将DartPluginRegistrant.ensureInitialized()初始化为WidgetsFlutterBinding.ensureInitialized()之前。
在那之前，有一个解决方法。 #99155
那里描述的解决方法也适用于 path_provider：
添加对 path_provider_android 和 path_provider_ios 的依赖。
在后台隔离入口点的开头，添加如下内容：
if (Platform.isAndroid) PathProviderAndroid.registerWith();
if (Platform.isIOS) PathProviderIOS.registerWith();
我的 Flutter 应用程序在初始屏幕上冻结，我收到以下错误日志：
Built build\app\outputs\apk\debug\app-debug.apk.
I/Choreographer(18870): Skipped 75 frames! The application may be doing too much work on its main thread.
D/EGL_emulation(18870): eglMakeCurrent: 0xe8885480: ver 3 0 (tinfo 0xe88835a0)
I/OpenGLRenderer(18870): Davey! duration=2142ms; Flags=1, IntendedVsync=65263803118670, Vsync=65265053118620, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=65265065657900, AnimationStart=65265065738100, PerformTraversalsStart=65265065780200, DrawStart=65265126086300, SyncQueued=65265197367200, SyncStart=65265199471900, IssueDrawCommandsStart=65265199680700, SwapBuffers=65265651453000, FrameCompleted=65265947767800, DequeueBufferDuration=12659000, QueueBufferDuration=920000,
Syncing files to device Android SDK built for x86...
E/flutter (18870): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: MissingPluginException(No implementation found for method getApplicationDocumentsDirectory on channel plugins.flutter.io/path_provider)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:7)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #1 getApplicationDocumentsDirectory (package:path_provider/path_provider.dart:84:22)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #2 DbContext.initDb (package:appentrega/database.dart:34:45)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #3 DbContext.getContext (package:appentrega/database.dart:27:21)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #4 _SplashScreenState.startTime (package:appentrega/splash.dart:16:34)
Syncing files to device Android SDK built for x86...
E/flutter (18870): <asynchronous suspension>
Syncing files to device Android SDK built for x86...
E/flutter (18870): #5 _SplashScreenState.initState (package:appentrega/splash.dart:33:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #6 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4068:58)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #7 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #8 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #9 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #10 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #11 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #12 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #13 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #14 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #15 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #16 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #17 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #18 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #19 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #20 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #21 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #22 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #23 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #24 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #25 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #26 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #27 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #28 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5127:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #29 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #30 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #31 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #32 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #33 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #34 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #35 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #36 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #37 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #38 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #39 Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #40 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #41 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #42 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #43 Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
Syncing files to device Android SDK built for x86...
E/flutter (18870): #44
Syncing files to device Android SDK built for x86...
D/EGL_emulation(18870): eglMakeCurrent: 0xe8885720: ver 3 0 (tinfo 0xe88832f0)
Syncing files to device Android SDK built for x86...
4.034ms (!)
看起来问题出在这里： [错误：flutter/lib/ui/ui_dart_state.cc(148)] 未处理的异常：MissingPluginException（未在通道 plugins.flutter.io/path_provider 上找到方法 getApplicationDocumentsDirectory 的实现）
已经完成：
-删除所有插件并重新安装flutter pub get。
-运行了 flutter clean 和 flutter run
此错误通常发生在您获得插件但未再次构建应用程序时。如果在 pubspec.yaml 上安装插件后出现这种情况，请重新安装您的 apk。如果这不是您的问题，您是否创建了支持 kotlin 和 swift 的项目？我不知道是不是这种情况，但大多数插件都需要这个
原来我不得不退出 flutter 运行 进程并重新启动它。只是在 flutter 运行 中完全重启没有用。
这里有一个link供参考https://github.com/flutter/flutter/issues/10912
编辑：确保导入这些包；
- 包：path_provider/path_provider.dart
- 飞镖：io
- 飞镖：异步
在我的例子中是为了缓存，我删除了 cached_network_image 并将其替换为 Image.network，问题消失了
就我而言，我没有包含 dart:async 包。 运行“flutter 运行”并包含“dart:async”包解决了问题
在构建发布 apk 后，我在另一个插件上遇到了这个错误， 这是因为默认情况下启用代码收缩 - 如果您不想 minify/obfuscate 代码，只需在 android/app/build.gradle.
中添加两行android {
...
buildTypes {
release {
...
shrinkResources false
minifyEnabled false
}
}
}
就我而言，我的 AndroidManifest.xml 文件中缺少以下代码段。
<meta-data
android:name="flutterEmbedding"
android:value="2" />
将其添加到 AndroidManifest.xml 文件中解决了问题。
Upgrading-pre-1.12-Android-projects之后!!
如果您没有太多时间尝试编辑步骤 5AppDelegate.h
我按照指南更新后通过了：Upgrading-pre-1.12-Android-projects 应用以下操作：
将 flutter 更新到最新的稳定版本 -> flutter clean 丢失
更新你所有的依赖（很可能是packages有或者要求你添加新的方法）-> flutter clean不过分
更新包更新产生的代码和方法
尝试 flutter 运行 或从 android Studio |>（某些软件包可能会向您发送 missingPluginException 但如果它安装在移动设备上）转到第 5 步。
如果可以的话，为 android 和 IOS 构建测试安装（它们应该可以正常工作）。 很可能在使用 flutter 运行 进行开发时它会继续发送错误，在我的情况下我无法在 IOS 中进行测试，但是对于 flutter 运行 它 运行s 运行s android 和 IOS 并通过将其添加到 ios / Runner / AppDelegate.h ->[GeneratedPluginRegistrant registerWithRegistry: self];
来解决问题#import <颤动/Flutter.h> #import
@interface AppDelegate：FlutterAppDelegate [GeneratedPluginRegistrant registerWithRegistry: self]; @EnD
如果在这些步骤之后无法在步骤 4 0 5 中执行，请验证其他依赖项是否未更新其版本以与 Upgrading-pre-1.12-Android-projects ! 兼容。例如 cached_network_image 使用 path_provider 尝试卸载 cached_network_image 包 再次从第 4 步开始重复。
Web 版 Flutter
我 运行 在开始向应用程序添加 Web 支持后进入此状态。 getApplicationDocumentsDirectory() 函数仅支持 iOS 和 Android (docs)。我添加了一个 web 检查并更改了我设置目录的方式，这为我修复了“未找到方法的实现”。
判断平台是否为 web 使用 Flutter 的 kIsWeb：
import 'package:flutter/foundation.dart' show kIsWeb;
然后相应地处理设置目录：
if (kIsWeb) {
// Set web-specific directory
} else {
appDocumentDirectory = await path_provider.getApplicationDocumentsDirectory();
}
对我有用的是在Application.java（或Application.kt）中注册相应的插件方法通道。所以是这样的：
package com.example.lifely;
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.pathprovider.PathProviderPlugin;
public class Application extends FlutterApplication implements PluginRegistrantCallback {
@Override
public void registerWith(PluginRegistry registry) {
PathProviderPlugin.registerWith(registry.registrarFor("io.flutter.plugins.pathprovider.PathProviderPlugin"));
}
}
您只需要重新安装应用程序
或
您可以使用 https://pub.dev/packages/permission_handler 运行时
管理权限通常，当您在 AndroidManifest.xml 文件中提到权限时，它会在应用程序首次启动时请求权限，这就是为什么您需要重新安装应用程序或从权限管理器授予权限，或者您可以从您的应用程序动态使用以上套餐
如果你的包依赖于flutter_facebook_auth, you need to make sure you have performed the setup for Android和iOS来摆脱这个错误。我正在使用 Hive 和 Facebook 登录，令人惊讶的是，缺少 Facebook 设置导致 Hive.initFlutter() 抛出此错误。
即使您实际上没有在您的 Facebook 开发者帐户上设置 Facebook 应用程序，此修复程序仍然有效。
在 Flutter MacOS 桌面应用程序 上使用 cached_network_image 时出现此错误 - 认为这是由 2.0. path_provider 包的 0 个更新：
我认为是因为 cached_network_image 使用的 path_provider 函数 (getTemporaryDirectory()) 没有在桌面上定义路径，这导致它抛出错误。
为了解决这个问题（在我的例子中），我导入了 path_provider_macos 包（https://pub.dev/packages/path_provider_macos）并在我的应用程序启动之前在 main 中注册了它。
void main() {
PathProviderMacOS.registerWith();
runApp(MyApp());
}
我还没有测试过其他平台，但是存在 linux (https://pub.dev/packages/path_provider_linux) and windows (https://pub.dev/packages/path_provider_windows) 的软件包，所以应该也能解决这些平台上的问题。
由于 Flutter 团队正在 Dart plugin registration doesn't run in background isolates #98591 中采用 in-package 平台通道在更多的 1P 插件中，这需要注册 Dart 插件，因此插件在 Isolates 中无法使用框，完成后工作仍在进行中你需要将DartPluginRegistrant.ensureInitialized()初始化为WidgetsFlutterBinding.ensureInitialized()之前。
在那之前，有一个解决方法。 #99155
那里描述的解决方法也适用于 path_provider：
添加对 path_provider_android 和 path_provider_ios 的依赖。
在后台隔离入口点的开头，添加如下内容：
if (Platform.isAndroid) PathProviderAndroid.registerWith();
if (Platform.isIOS) PathProviderIOS.registerWith();