Closed
Description
- I have read the README
- I have done the setup for [Android](https://github.com/vrtdev/flutter_workmanager/blob/master/ANDROID_SETUP.md
Describe the error
I have a native logic that handles notifications in the Android platform and I wish to use this implementation with Workmanager, but whenever the execution runs I only get this error:
Error: MissingPluginException MissingPluginException(No implementation found for method sendNotification on channel flutter_notification_channel)
I am unaware of how I can register my native plugin with Workmanager. I see that it starts a new Flutter Engine, but that does not register my Native implementation. My native implementation is correct as I have tested that out independently. I am unaware as to how this can work in the new Android v2 bindings.
Code sample
NotficiationPlugin.kt
class NotificationPlugin: FlutterPlugin, MethodChannel.MethodCallHandler {
private val CHANNEL_NAME = "flutter_notification_channel"
private var channel: MethodChannel? = null
private var notificationService: NotificationService? = null
override fun onAttachedToEngine(binding: FlutterPlugin.FlutterPluginBinding) {
setupChannel(binding.binaryMessenger, binding.applicationContext)
}
override fun onDetachedFromEngine(p0: FlutterPlugin.FlutterPluginBinding) {
teardownChannel();
}
private fun setupChannel(messenger: BinaryMessenger, context: Context) {
channel = MethodChannel(messenger, CHANNEL_NAME)
channel?.setMethodCallHandler(this)
notificationService = NotificationService(context)
}
private fun teardownChannel() {
channel?.setMethodCallHandler(null)
channel = null
notificationService = null
}
override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
val hashMap = call.arguments as HashMap<*, *>
when (call.method) {
"registerChannel" -> {
val channelId = hashMap["channelId"] as String
val channelName = hashMap["channelName"] as String
val channelDescription = hashMap["channelDescription"] as? String ?: ""
notificationService?.registerChannel(
channelId,
channelName,
channelDescription
)
result.success(null)
}
"areNotificationsEnabled" -> {
result.success(notificationService?.isNotificationEnabled)
}
"sendNotification" -> {
val channelId = hashMap["channelId"] as String
val title = hashMap["title"] as String
val message = hashMap["message"] as String
val id = notificationService?.notify(title, message, channelId)
result.success(id)
}
else -> result.notImplemented()
}
}
}MainActivity.kt
class MainActivity : FlutterActivity() {
override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
super.configureFlutterEngine(flutterEngine)
flutterEngine.plugins.add(NotificationPlugin())
}
}WorkManager.dart
@pragma('vm:entry-point')
void callbackDispatcher() {
Workmanager().executeTask((task, inputData) async {
try {
var channel = MethodChannel('flutter_notification_channel');
final args = {
"channelId": "habit_board_daily_reminder_channel",
"title": "Helloo",
"message": "I am a test",
};
await channel.invokeMethod("sendNotification", args);
} catch (e) {
e.printError();
}
return Future.value(true);
});
}
class WorkManagerService {
WorkManagerService();
final _manager = Workmanager();
Future scheduleReminderChecker() async {
await _manager.initialize(callbackDispatcher, isInDebugMode: true);
_manager.registerPeriodicTask(
"reminder-task",
"reminder-task",
existingWorkPolicy: ExistingWorkPolicy.keep,
frequency: Duration(minutes: 15),
);
}
cancelAll() {
_manager.cancelAll();
}
}
main.dart
void main() async {
WidgetsFlutterBinding.ensureInitialized();
DartPluginRegistrant.ensureInitialized();
///...Also includes some logic to register the notification channel here.
await WorkManagerService().scheduleReminderChecker();
SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
statusBarIconBrightness: Brightness.light,
statusBarBrightness: Brightness.dark,
));
runApp(
Container(
child: MaterialApp(
theme: appTheme,
debugShowCheckedModeBanner: false,
initialRoute: Routes.HOME,
defaultTransition: Transition.fade,
),
),
);
Version
- Platform: Android
- Flutter version: 3.10.5
- Hive version: [e.g. 0.5.0]