When ever I am trying to run the app using chrome its giving me exception MissingPluginException(No implementation found for method loadEnvVariables on channel flutter_config) and only blank white screen is shown every time.
flutter_config doesn't support web platform - only Android and iOS.
Plugin that exposes environment variables to your Dart code in Flutter as well as to your native code in iOS and Android.
Related
I want to use flutter app badge for incoming notification, I used package "package:flutter_app_badger" but its not working. Its not giving me error message also and it run succefully but its not working.
I am using android vivo mobile for testing.
When i check this package is supported to my device or not ? with following code and its says yes, this device is supported app badger.
for platform checking:
FlutterAppBadger.isAppBadgeSupported();
for add badge on app icon i below code simply:
FlutterAppBadger.updateBadgeCount(1);
can anyone please solve this query its really helpful to me.
I'm building a Flutter app that will have the capability to execute some actions when the device connects to another bluetooth device. This app should work on Android and iOS but for the sake of simplicity I'll focus on Android in this post. Also, this has to work whether the app is in the foreground, in the background or killed.
Here is the architecture of the app:
I have an Android native code that registers to bluetooth events through a BroadcastReceiver.
I followed this tutorial to set up the communication between the Android code and the Flutter code: https://medium.com/#chetan882777/initiating-calls-to-dart-from-the-native-side-in-the-background-with-flutter-plugin-7d46aed32c47.
When the Android BroadcastReceiver is triggered by a bluetooth event, the information is sent to the Flutter code (even if the app was in the background or killed). A Flutter isolate is created to handle the Flutter code.
Everything works perfectly well. The Flutter code is called and I can use print(data) to log the data that have been provided by the Android code.
Things are becoming more tricky when, from the isolate, I want to call any Flutter plugin (like sqflite, package_info_plus, ...). I get this error every time:
[ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception:
MissingPluginException(No implementation found for method xxx on
channel yyy)
I understand that spawned isolate can't natively run Flutter plugins. There are some posts (Unable to understand Flutter Isolate workaround for "'Window_sendPlatformMessage' (4 arguments) cannot be found" error, https://github.com/flutter/flutter/issues/13937) that explain how to create isolates that can run Flutter plugins by using a workaround or a plugin like https://pub.dev/packages/flutter_isolate.
However, I can't create the isolate with this package because the isolate is created from the Android code.
Can one of you tell me how I can achieve this? Is there a way to use Flutter plugins from an isolate that has been created by native code?
Thank you very much in advance
Sounds like the way you create the Flutter isolate may not be compatible with your goal. There are some solutions to integrate Flutter with native Android/iOS projects, such as flutter_boost (disclaimer: I have not tried it and not sure good or not; you may find many other alternatives as well, this is just an example). You can use that to create the Flutter environments. Since the solutions above allow some Android code to open a new normal Flutter page and Flutter code in that page is able to do anything (of course include calling native - otherwise things like flutter_boost is really useless), this should work.
I have a flutter app, works well on mobile, am trying to have the same app on web. am using moor to sync and store data locally incase there is no internet and when internet is back it syncs with the server. Now when I try to run the same app on the web, moor is complaining
Error: MissingPluginException(No implementation found for method getDatabasesPath on channel com.tekartik.sqflite)
the plugin says it supports web, from here. Am not finding much information on how to resolve this, how can I configure moor to run on the web without that error?
The plugin moor you are using is built on top of sqlite, which itself is not supported on web, and at bottom of moor plugin page also it's mentioned that web support is experimental now.
Sqlite plugin doesn't has support for web yet, but it does support android, ios and Macos. I would suggest anyone facing this problem to use other databases or cloud based databases instead of sqlite if you are using flutter web. Hope the plugin gets supported on web also.
Update:
You can try this example to use sqlite on web, it might work.
Got the same error when first run the web app.
If you follow clean architecture you can easily provide the right "database" instance.
This is what I did:
Create a local data store interface
Check if web using kIsWeb
If kIsWeb it true I return an in memory cache otherwise I just return the mobile app database that you already implemented for you Android and iOS apps
I read this Android specific article and was wondering if some applications existed for Flutter aswell.
I know it is possible to run native code in Flutter, but I'd prefer a Dart native solution. I've noticed this package on pub.dev but I cannot make it work.
I've followed the posted example but I get a MissingPluginException for every call the plugin executes.
Yes You can do it by using this package .
https://pub.dev/packages/flutter_nearby_connections
When I create a new Flutter project, it asks me to choose between Java/Kotlin for Android and Objective-c/Swift for iOS. But, what does this mean? Is it in case I want to write something for Android or iOS specifically?
Yes that is correct. In Flutter you have the option to call into platform-specific APIs. This is especially useful if you need to access functionality that is not available in Flutter directly (e.g. accessing the keychain on iOS or the keystore on Android).
To do so you can open up a message channel which bridges the Dart world with the platform-specific world. You can use this message channel to send a message from Dart to you platform-specific code. This platform-specific code is either Java/Kotlin for Android or Objective-C/Swift for iOS, depending on your selections during the creation of the project.
More detailed information can be found in the Flutter documentation here: https://flutter.dev/docs/development/platform-integration/platform-channels
Just a heads up, the Flutter team and the Flutter community already wrote a lot of OSS packages and plugins that will take care of the platform-specific stuff and offer you an easy Dart API. You can search for these packages in the Pub: https://pub.dev