在 flutter 中构建 Android 时出现“错误：找不到符号”

Question

I keep getting this error when trying to build for android in my flutter app. This all happened when i added firebase messaging version 7.0.3 . Even after removing it i got this issue persisting.

/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:20: error: cannot find symbol
    flutterEngine.getPlugins().add(new io.flutter.plugins.flutter_plugin_android_lifecycle.FlutterAndroidLifecyclePlugin());
                                                                                          ^
  symbol:   class FlutterAndroidLifecyclePlugin                         
  location: package io.flutter.plugins.flutter_plugin_android_lifecycle 
/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:24: error: cannot find symbol
    flutterEngine.getPlugins().add(new io.flutter.plugins.googlemaps.GoogleMapsPlugin());
                                                                    ^   
  symbol:   class GoogleMapsPlugin                                      
  location: package io.flutter.plugins.googlemaps                       
/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:25: error: cannot find symbol
    flutterEngine.getPlugins().add(new io.flutter.plugins.googlesignin.GoogleSignInPlugin());
                                                                      ^ 
  symbol:   class GoogleSignInPlugin                                    
  location: package io.flutter.plugins.googlesignin                     
/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:26: error: cannot find symbol
    flutterEngine.getPlugins().add(new io.flutter.plugins.imagepicker.ImagePickerPlugin());
                                                                     ^  
  symbol:   class ImagePickerPlugin                                     
  location: package io.flutter.plugins.imagepicker                      
/Users/bright/Desktop/flutter_apps/rush_user_app/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java:30: error: cannot find symbol
    flutterEngine.getPlugins().add(new io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin());
                                                                           ^
  symbol:   class SharedPreferencesPlugin                               
  location: package io.flutter.plugins.sharedpreferences                
5 errors  
Running Gradle task 'assembleDebug'... Done                       102.9s
Exception: Gradle task assembleDebug failed with exit code 1

Here is my GeneratedPluginRegistrant.java

package io.flutter.plugins;

import androidx.annotation.Keep;
import androidx.annotation.NonNull;

import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.embedding.engine.plugins.shim.ShimPluginRegistry;

/**
 * Generated file. Do not edit.
 * This file is generated by the Flutter tool based on the
 * plugins that support the Android platform.
 */
@Keep
public final class GeneratedPluginRegistrant {
  public static void registerWith(@NonNull FlutterEngine flutterEngine) {
    ShimPluginRegistry shimPluginRegistry = new ShimPluginRegistry(flutterEngine);
    flutterEngine.getPlugins().add(new io.flutter.plugins.flutter_plugin_android_lifecycle.FlutterAndroidLifecyclePlugin());
    flutterEngine.getPlugins().add(new io.github.ponnamkarthik.toast.fluttertoast.FlutterToastPlugin());
    flutterEngine.getPlugins().add(new com.baseflow.geolocator.GeolocatorPlugin());
    flutterEngine.getPlugins().add(new com.baseflow.googleapiavailability.GoogleApiAvailabilityPlugin());
    flutterEngine.getPlugins().add(new io.flutter.plugins.googlemaps.GoogleMapsPlugin());
    flutterEngine.getPlugins().add(new io.flutter.plugins.googlesignin.GoogleSignInPlugin());
    flutterEngine.getPlugins().add(new io.flutter.plugins.imagepicker.ImagePickerPlugin());
      com.codeheadlabs.libphonenumber.LibphonenumberPlugin.registerWith(shimPluginRegistry.registrarFor("com.codeheadlabs.libphonenumber.LibphonenumberPlugin"));
    flutterEngine.getPlugins().add(new com.lyokone.location.LocationPlugin());
    flutterEngine.getPlugins().add(new com.baseflow.location_permissions.LocationPermissionsPlugin());
    flutterEngine.getPlugins().add(new io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin());
    flutterEngine.getPlugins().add(new com.aboutyou.dart_packages.sign_in_with_apple.SignInWithApplePlugin());
  }
}

Here is my android folder structure

I have tried to google for solutions but i have not found any suggestions that were similar to my issue. Here is my flutter doctor output

[✓] Flutter (Channel stable, 1.22.5, on Mac OS X 10.15.4 19E287 darwin-x64, locale en-KE)
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.
 
[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
[✓] Android Studio (version 3.6)
[✓] VS Code (version 1.53.2)
[✓] Connected device (1 available)

! Doctor found issues in 1 category.

Here are my dependencies

dependencies:
  flutter:
    sdk: flutter
  carousel_slider: ^2.3.1
  intl_phone_number_input: ^0.5.2+2
  pinput: ^0.2.6
  cupertino_icons: ^1.0.0
  dotted_border: ^1.0.6
  dotted_line: ^2.0.2
  date_field: ^1.0.5
  intl: ^0.16.1
  image_picker: ^0.6.7+22
  flutter_rating_bar: ^3.2.0+1
  signature: ^3.2.0
  scrollable_positioned_list: ^0.1.9
  http: ^0.12.1
  shared_preferences: ^0.5.12+4
  provider: null
  google_maps_flutter: ^1.2.0
  location: ^3.2.4
  geolocator: ^5.3.2+2
  shimmer: ^1.1.2
  flutter_google_places: ^0.2.6
  google_maps_webservice: ^0.0.19
  fluttertoast: ^7.1.6
  flutter_polyline_points: ^0.2.4
  uuid: null
  google_sign_in: ^4.5.9
  sign_in_with_apple: ^2.5.4
  firebase_messaging: ^7.0.3

I have tried migrating to a new project and transffering the lib, ios and pubspec.yaml only but the error is still there. Please help!

Answer 1

After a sweaty struggle i decided to try a random solution out of the countless search results i got and voila

flutter pub cache repair

Answer 2

For me I always try cleaning flutter build:

flutter clean

Answer 3

Just run

flutter clean
flutter build

I had same problem, this one helps.

Answer 4

Spent an hour in random fixes. Finally running 'flutter clean' and rebuilding worked

Answer 5

In my case

My Error: ->

C:\Users\Niket\flutter\.pub-cache\hosted\pub.dartlang.org\permission_handler-8.3.0\android\src\main\java\com\baseflow\permissionhandler\PermissionManager.java:321: error: cannot find symbol
            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {
                                                           ^
  symbol:   variable S
  location: class VERSION_CODES

Solution:

Step 1: Goto android/app/src/build.gradle

Step 2: Update compileSdkVersion to your virtual device version

android {
    compileSdkVersion 31 //before its 30 
    ...
}

Answer 6

Issue fixed for my by running following two commands

flutter clean
flutter pub get

Answer 7

I have tried all options for this

1. flutter clean
2. flutter build apk

Even after this i could not find my solution. finally i ratified my mistake that i have not added

key.properties file in project

Answer 8

You must have detached a plugin from pubspec.yml cache needs to be clear

flutter clean
flutter pub cache repair
flutter pub get