Flutter MissingPluginException with several plugins

Question

I've been using a handful of flutter plugins recently. Many worked perfectly, but I stumbled across frustrating errors several times, generally resulting in giving up the plugins.

Here is the last one I got, with schedule_notifications :

E/flutter (24758): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (24758): MissingPluginException(No implementation found for method getIconResourceId on channel schedule_notifications_app)
E/flutter (24758): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:278:7)
E/flutter (24758): <asynchronous suspension>
E/flutter (24758): #1      _MyAppState._getIconResourceId (<my path>/sandbox/lib/main.dart:67:40)
E/flutter (24758): <asynchronous suspension>
E/flutter (24758): #2      _MyAppState.initState (<my path>/sandbox/lib/main.dart:24:7)
E/flutter (24758): #3      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3751:58)
E/flutter (24758): #4      ComponentElement.mount (package:flutter/src/widgets/framework.dart:3617:5)
E/flutter (24758): #5      Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter (24758): #6      Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter (24758): #7      RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:857:16)
E/flutter (24758): #8      RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:828:5)
E/flutter (24758): #9      RenderObjectToWidgetAdapter.attachToRenderTree.<anonymous closure> (package:flutter/src/widgets/binding.dart:774:17)
E/flutter (24758): #10     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2222:19)
E/flutter (24758): #11     RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:773:13)
E/flutter (24758): #12     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding&WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:662:7)
E/flutter (24758): #13     runApp (package:flutter/src/widgets/binding.dart:704:7)
E/flutter (24758): #14     main (<my path>/sandbox/lib/main.dart:8:16)
E/flutter (24758): #15     _startIsolate.<anonymous closure> (dart:isolate/runtime/libisolate_patch.dart:279:19)
E/flutter (24758): #16     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:165:12)
D/libGLESv2(24758): DTS_GLAPI : DTS is not allowed for Package : <my package>
D/libGLESv1(24758): DTS_GLAPI : DTS is not allowed for Package : <my package>
D/ViewRootImpl(24758): ViewPostImeInputStage processPointer 0
D/ViewRootImpl(24758): ViewPostImeInputStage processPointer 1

There are many examples of similar questions on SO and GitHub (see the end of my post), but the only thing ever suggested to fix them is "use flutter clean, flutter upgrade, flutter packages get and then flutter run". Sometimes it may be enough, but not always - in my particular case, I still get the exact same error.

Noticeably, if I clone the whole GitHub repository of the plugin and run the example from within this directory, it does work well. But if I try to re-create the example project, it does not, so I take it I'm missing something, but what ?

Here are the steps I followed to re-create the example :

Create a new Flutter project in Android Studio
Add the dependency schedule_notifications: ^0.1.8 in pubspec.yaml
Click on the Flutter commands Packages get and Packages upgrade in Android Studio
Click on the popup Get packages in Android Studio when it appeared
Paste the code from https://github.com/serralvo/schedule_notifications/blob/master/example/lib/main.dart in my main.dart file
Change the line import 'package:schedule_notifications_example/time_picker.dart'; into import 'time_picker.dart'; to resolve the error I got from Android Studio
Create a file time_picker.dart next to main.dart and paste in it the code from https://github.com/serralvo/schedule_notifications/blob/master/example/lib/time_picker.dart
Execute the project in Android Studio and get the aforementioned error
Launch the Flutter console and go in the directory of my project
Execute the commands flutter clean, flutter upgrade, flutter packages get in the console
Execute the command flutter run in the console and still get the same error

So, what is going on exactly ? What could produce this behavior with some plugins, for some developers or some projects ? What am I doing wrong ?

Examples of similar questions :

Does this answer your question? [Flutter: Unhandled exception: MissingPluginException(No implementation found for method getAll on channel plugins.flutter.io/shared\_preferences)](https://stackoverflow.com/questions/50687801/flutter-unhandled-exception-missingpluginexceptionno-implementation-found-for) — Petrus Nguyễn Thái Học, Mar 01 '21 at 07:47

score 8 · Answer 1 · answered Nov 22 '19 at 21:48

8

In my case, I had removed this line(by mistake) from MainActivity.kt (inside the onCreate hook)

    GeneratedPluginRegistrant.registerWith(this)

Probably a mistake, but cost me a lot of time. Hope helps someone.

answered Nov 22 '19 at 21:48

rahulserver

10,411
24
90
164

I have the same issue when I went to the MainActivity.kt, I had: package com.example.komerso import androidx.annotation.NonNull; import io.flutter.embedding.android.FlutterActivity import io.flutter.embedding.engine.FlutterEngine import io.flutter.plugins.GeneratedPluginRegistrant class MainActivity: FlutterActivity() { override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) { GeneratedPluginRegistrant.registerWith(flutterEngine); } } Do i missing something? – Haniel Baez Jan 18 '20 at 05:26
This fixed my issue, it seems that if we override "configureFlutterEngine" , this method needs to be explicitly called in the end of it. – Tiago Santos May 31 '20 at 17:49
Can you provide the full code of `MainActivity.kt` please? – Ovidiu Uşvat Nov 13 '20 at 14:05

score 7 · Answer 2 · answered Mar 01 '19 at 08:05

7

When you add new plugin, you need to re-build the application, the hot re-start doesn't build the application and your newly added is not included in your project unless built again.

answered Mar 01 '19 at 08:05

Raj Yadav

9,677
6
35
30

score 5 · Answer 3 · answered Apr 26 '20 at 15:44

After spending 12 hrs of a continuous effort to solve this in a flutter android project... finally solved - inspired by "@rahulserver" solution as follows

Just merge the following code in "MainActivity.java"

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    GeneratedPluginRegistrant.registerWith(this.getFlutterEngine());
}

Note: The MainActivity extends FlutterActivity

score 4 · Answer 4 · answered Jun 25 '18 at 15:34

Alright, I'm posting what I found in case it could help somebody in the future. But I'm still interested in further explanations.

So, to make the schedule_notifications plugin work, I had to open the file MainActivity.java in the example project. There, I noticed some lines which were not present in my own project :

    MethodChannel methodChannel = new MethodChannel(getFlutterView(), "schedule_notifications_app");
    methodChannel.setMethodCallHandler(new MethodChannel.MethodCallHandler() {
      @Override
      public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {
        if (methodCall.method.equals("getIconResourceId")) {
          result.success(R.mipmap.ic_launcher);
        }
      }
    });

When I copied and pasted those lines in my own MainActivity.java file (with the right imports), my project finally worked.

You'll notice that in main.dart, we have these lines :

static const _platform = const MethodChannel('schedule_notifications_app');

and

iconResourceId = await _platform.invokeMethod('getIconResourceId');

Those are linked to the new lines in MainActivity.java. That's where the issue came from.

Performing those steps result in making the plugins work, but I'm unsure if it is good or awful practice. And in case it really is what we are supposed to do, I must say it is quite not obvious ! I think that at least the plugins installation docs should explain it.

score 4 · Answer 5 · answered Jul 27 '18 at 12:03

4

I had the same issue and took me a while to understand why it’s happening. The solution is simple, just kill the application and run a fresh one.

answered Jul 27 '18 at 12:03

Jaswant Singh

9,900
8
29
50

score 1 · Answer 6 · answered Aug 09 '20 at 12:40

1

Do a flutter clean and flutter pub get. After adding any plugin statement in pubspec.yaml file, you need to do a flutter packages get command. Stopping running app, uninstalling then rebuild worked for me.

answered Aug 09 '20 at 12:40

Md. Sulayman

781
8
30

score 1 · Answer 7 · answered Aug 13 '21 at 02:25

I fixed this by modifying the Android build a little.

Goto android/app/build.gradle
Add the following lines:

android {

   // other config stuff here

   buildTypes {
       release {
           signingConfig signingConfigs.release

           // Add these 2 lines
           minifyEnabled false   
           shrinkResources false
       }
   }
}

I think this prevents some build optimisations, which break the plugin registration somehow...

Flutter MissingPluginException with several plugins

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