未處理的異常：MissingPluginException（未找到實現

Question

我有幾個插件有問題

image_picker: ^0.6.2+3 , 位置: ^2.3.5 ,...

我很干凈，沒有任何改變

安卓設備： SM-N900

安卓版本： 5.0

主要活動

import androidx.annotation.NonNull;

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugins.GeneratedPluginRegistrant;

public class MainActivity extends FlutterActivity {
  @Override
  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
    GeneratedPluginRegistrant.registerWith(flutterEngine);
  }
} 

生成的插件注冊者

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.deviceinfo.DeviceInfoPlugin());
      io.flutter.plugins.imagepicker.ImagePickerPlugin.registerWith(shimPluginRegistry.registrarFor("io.flutter.plugins.imagepicker.ImagePickerPlugin"));
      com.lyokone.location.LocationPlugin.registerWith(shimPluginRegistry.registrarFor("com.lyokone.location.LocationPlugin"));
    flutterEngine.getPlugins().add(new io.flutter.plugins.pathprovider.PathProviderPlugin());
      flutter.plugins.screen.screen.ScreenPlugin.registerWith(shimPluginRegistry.registrarFor("flutter.plugins.screen.screen.ScreenPlugin"));
    flutterEngine.getPlugins().add(new io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin());
      com.tekartik.sqflite.SqflitePlugin.registerWith(shimPluginRegistry.registrarFor("com.tekartik.sqflite.SqflitePlugin"));
      altercode.xyz.uniqueidentifier.UniqueIdentifierPlugin.registerWith(shimPluginRegistry.registrarFor("altercode.xyz.uniqueidentifier.UniqueIdentifierPlugin"));
    flutterEngine.getPlugins().add(new io.flutter.plugins.urllauncher.UrlLauncherPlugin());
  }
}

撲醫生

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
 Flutter (Channel stable, v1.12.13+hotfix.5, on Microsoft Windows [Version
    6.1.7601], locale en-US)
 Android toolchain - develop for Android devices (Android SDK version 28.0.
3)
 Android Studio (version 3.5)
[!] IntelliJ IDEA Community Edition (version 2018.3)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[!] VS Code (version 1.38.1)
    X Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[!] Connected device
    ! No devices available

! Doctor found issues in 3 categories.

我的例外之一是：

E/flutter（8362）：[錯誤：flutter/lib/ui/ui_dart_state.cc（157）]未處理的異常：MissingPluginException（在通道lyokone/location上找不到方法serviceEnabled的實現）E/flutter（8362）：#0 MethodChannel .invokeMethod (package:flutter/src/services/platform_channel.dart:319:7) E/flutter (8362): E/flutter (8362): #1 Location.serviceEnabled (package:location/location.dart:74:16 ) E/flutter ( 8362): #2 _SettingState._wifiStatus (package:flutter_example/Setting.dart:231:49) E/flutter (8362): #3 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart :706:14) E/flutter (8362)：#4 _InkResponseState.build。 (package:flutter/src/material/ink_well.dart:789:36) E/flutter (8362): #5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24) E/flutter ( 8362): #6 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:486:11) E/flutter (8362): #7 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart: 264:5) E/flutter (8362): #8 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:199:7) E/flutter (8362): #9 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/ src/gestures/recognizer.dart:467:9) E/flutter (8362): #10 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:76:12) E/flutter (8362): #11 PointerRouter._dispatchEventToRoutes。 (package:flutter/src/gestures/pointer_router.dart:117:9) E/flutter (8362): #12 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:379:8) E/flutter (8362) : #13 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:115:18) E/flutter (8362): #14 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101: 7) E/flutter (8362): #15 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:218:19) E/flutter (8362): #16 GestureBinding.dispatchEvent (package:flutter/src/手勢/binding.dart:198:22) E/flutter (8362): #17 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7) E/flutter (8362): #18 GestureBinding。 _flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7) E/flutter (8362): #19 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7) E/flutter （8362）：#20 _rootRunUnary（dart:async/zone.dart:1138:13）E/flutter（8362）：#21 _CustomZone.runUnary (dart:async/zone.dart:1031:19) E/flutter (8362): #22 _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7) E/flutter (8362): #23 _invoke1 (dart:ui/hooks.dart:273:10) E/flutter (8362): #24 _dispatchPointerDataPacket (dart:ui/hooks.dart:182:5)

我的代碼：

var _locationService = new Location();

bool serviceStatus = await _locationService.serviceEnabled();

Answer 1

您是否嘗試在添加插件后重新啟動？ 使用hot reload運行應用程序可能尚未包含您最近在構建中添加的插件。