FLUTTER：将image_picker作为依赖项添加时，在发行版安装中缺少MissingPlugins

如何解决FLUTTER：将image_picker作为依赖项添加时，在发行版安装中缺少MissingPlugins

我目前在 Android 中遇到以下问题： flutter share插件以及url_launcher插件在实际的发行版安装中不起作用。 一切在调试（物理设备和仿真器）中都可以正常工作。

此外，当在物理设备上运行发行版（从vscode）时，一切都正常。

但是，一旦我安装了发行版，插件将不再可用。

我花了大约3天的时间测试我的Flutter应用，并能够重现该错误。

我发现了以下内容：

• 物理设备logcat抛出缺少的插件异常

• 删除image_picker插件后，一切正常。

Internet权限已添加到Android.Manifest中。 编译和SDK版本为29。 最低SDK版本为21。

我真的希望有人能给我一些有关如何解决MissingPluginException问题的提示。

一个人可以强迫在发行版中注册插件吗？

• 我已经检查了GeneratedPluginRegistrant.java，并列出了所有内容。
• 我进行了十次清洁工作，并对酒吧缓存进行了十次修复
• 我使用了不同的gradle版本
• 我使用了不同的插件版本

谢谢您的时间！

尝试使用url_launcher或共享插件时引发错误：

E flutter : [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: MissingPluginException(No implementation found for method share on channel plugins.flutter.io/share)
11-11 20:36:28.091 23069 23094 E flutter : #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:157)
11-11 20:36:28.091 23069 23094 E flutter : <asynchronous suspension>
11-11 20:36:28.091 23069 23094 E flutter :

11-11 20:37:19.084 23069 23094 E flutter : [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: MissingPluginException(No implementation found for method canLaunch on channel plugins.flutter.io/url_launcher)
11-11 20:37:19.084 23069 23094 E flutter : #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:157)
11-11 20:37:19.084 23069 23094 E flutter : <asynchronous suspension>
11-11 20:37:19.084 23069 23094 E flutter : #1      canLaunch (package:url_launcher/url_launcher.dart:124)
11-11 20:37:19.084 23069 23094 E flutter : <asynchronous suspension>
11-11 20:37:19.084 23069 23094 E flutter : #2      _MyHomePageState._tryLaunchURL (package:atestapp/main.dart:36)
11-11 20:37:19.084 23069 23094 E flutter : <asynchronous suspension>
11-11 20:37:19.084 23069 23094 E flutter : #3      _MyHomePageState.build.<anonymous closure> (package:atestapp/main.dart:65)
11-11 20:37:19.084 23069 23094 E flutter : <asynchronous suspension>
11-11 20:37:19.084 23069 23094 E flutter :
11-11 20:37:20.273  3896  9400 D ClClient: Not sending keepalive.  Current connection state=STOPPED

Flutter Doctor -v输出：

[√] Flutter (Channel stable,1.22.3,on Microsoft Windows [Version 10.0.18363.1198],locale de-DE)
    • Flutter version 1.22.3 at C:\flutter
    • Framework revision 8874f21e79 (13 days ago),2020-10-29 14:14:35 -0700
    • Engine revision a1440ca392
    • Dart version 2.10.3

 
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at C:\Android-SDK
    • Platform android-29,build-tools 29.0.2
    • ANDROID_SDK_ROOT = C:\Android-SDK
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[!] Android Studio (version 4.1.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] VS Code,64-bit edition (version 1.51.0)
    • VS Code at C:\Program Files\Microsoft VS Code
    • Flutter extension version 3.16.0

[√] Connected device (1 available)
    • Pixel 2 XL (mobile) • 801KPTM1379449 • android-arm64 • Android 11 (API 30)

! Doctor found issues in 1 category.

pubspec.yaml

name: atestapp
description: A new Flutter project.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots,like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number,respectively.
# In Android,build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS,build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  image_picker: ^0.6.7+14
  url_launcher: ^5.7.10
  share: ^0.6.5+4

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.0

dev_dependencies:
  flutter_test:
    sdk: flutter

# For information on the generic Dart part of this file,see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application,so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application,add an assets section,like this:
  # assets:
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants",see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies,see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application,add a fonts section here,# in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name,and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,# see https://flutter.dev/custom-fonts/#from-packages

解决方法

我终于找到了问题！ 我测试了不同的gradle插件版本，并且不得不从/android/build.gradle中使用classpath 'com.android.tools.build:gradle:4.0.0'和classpath 'com.android.tools.build:gradle:4.1.0' TO classpath 'com.android.tools.build:gradle:3.5.0降级，同时保持distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip一样。