Flutter：错误：包 io.flutter.embedding.engine.plugins 不存在

Question

如何修复此错误 我尝试（Flutter Run）在显示此错误的 flutter 中调试我的代码和测试应用程序...在此之前我有 Gradle Build 错误，我在显示后修复它

支持的最低 Gradle 版本为 5.6.4。当前版本是5.6.2。如果使用 gradle 包装器，请尝试编辑 distributionUrl

我尝试在显示此错误后更新 gradle 版本）：

**> event sent after app closed: {id: 0, progressId: null, message: Running "flutter pub get" in play_big_win...}
event sent after app closed: {id: 0, progressId: null, finished: true}
Launching lib\main.dart on sdk gphone x86 in debug mode...
 lib\main.dart
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:14: error: package io.flutter.embedding.engine.plugins does not exist
import io.flutter.embedding.engine.plugins.FlutterPlugin;
                                          ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:15: error: package io.flutter.plugin.common does not exist
import io.flutter.plugin.common.MethodCall;
                               ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:16: error: package io.flutter.plugin.common does not exist
import io.flutter.plugin.common.MethodChannel;
                               ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:17: error: package io.flutter.plugin.common does not exist
import io.flutter.plugin.common.PluginRegistry;
                               ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:29: error: cannot find symbol
public class FlutterFirebaseCorePlugin implements FlutterPlugin, MethodChannel.MethodCallHandler {
                                                  ^
  symbol: class FlutterPlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:29: error: package MethodChannel does not exist
public class FlutterFirebaseCorePlugin implements FlutterPlugin, MethodChannel.MethodCallHandler {
                                                                              ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:47: error: cannot find symbol
  private MethodChannel channel;
          ^
  symbol:   class MethodChannel
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:71: error: package PluginRegistry does not exist
  public static void registerWith(PluginRegistry.Registrar registrar) {
                                                ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:77: error: cannot find symbol
  public void onAttachedToEngine(FlutterPluginBinding binding) {
                                 ^
  symbol:   class FlutterPluginBinding
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:84: error: cannot find symbol
  public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
                                            ^
  symbol:   class FlutterPluginBinding
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:223: error: cannot find symbol
  public void onMethodCall(MethodCall call, @NonNull final MethodChannel.Result result) {
                           ^
  symbol:   class MethodCall
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:223: error: package MethodChannel does not exist
  public void onMethodCall(MethodCall call, @NonNull final MethodChannel.Result result) {
                                                                        ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:72: error: cannot find symbol
    final MethodChannel channel = new MethodChannel(registrar.messenger(), CHANNEL_NAME);
          ^
  symbol:   class MethodChannel
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:72: error: cannot find symbol
    final MethodChannel channel = new MethodChannel(registrar.messenger(), CHANNEL_NAME);
                                      ^
  symbol:   class MethodChannel
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:76: error: method does not override or implement a method from a supertype
  @Override
  ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:79: error: cannot find symbol
    channel = new MethodChannel(binding.getBinaryMessenger(), CHANNEL_NAME);
                  ^
  symbol:   class MethodChannel
  location: class FlutterFirebaseCorePlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:83: error: method does not override or implement a method from a supertype
  @Override
  ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:222: error: method does not override or implement a method from a supertype
  @Override
  ^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_core-0.5.3\android\src\main\java\io\flutter\plugins\firebase\core\FlutterFirebaseCorePlugin.java:226: error: illegal start of type
    switch (call.method) {
           ^
19 errors
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':firebase_core:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 6m 45s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)**

Answer 1

您遇到的错误意味着您需要迁移到 AndroidX 或降级到与 AndroidX 之前的版本兼容的插件版本。

检查以下与迁移到 AndroidX 相关的问题：

• https://github.com/flutter/flutter/issues/27106
• https://github.com/flutter/flutter/issues/27146
• https://github.com/flutter/flutter/issues/27128

看一下这个：

突破性的改变。从已弃用的原始 Android 支持库迁移到 AndroidX。这不会导致任何功能更改，但它要求使用此插件的任何 Android 应用程序（如果它们使用原始支持库）也进行迁移。