private void HandleMethodCall(MethodCall call, MethodChannel.IResult result)
{
// Return an error if Flutter is invoking method calls through method channel
// when bridge is configured for WebSocket communication
if (Mode == FlutnetBridgeMode.WebSocket)
{
result.NotImplemented();
return;
}
// Extract target method information from MethodCall.Method
FlutnetMethodInfo methodInfo;
Object dartReturnValue;
try
{
methodInfo = JsonConvert.DeserializeObject <FlutnetMethodInfo>(call.Method, FlutterInterop.JsonSerializerSettings);
dartReturnValue = FlutterInterop.ToMethodChannelResult(0);
}
catch (Exception ex)
{
result.Error(FlutnetErrorCode.OperationNotImplemented.ToString(), ex.Message, null);
return;
}
// Send an empty - successful - response to immediately free Flutter thread
result.Success(dartReturnValue);
Task.Run(() => { BackgroundHandleMethodCall(methodInfo, call); });
}
private void FlutnetRuntimeOnPlatformEvent(object sender, OnPlatformEventArgs e)
{
// Prevent dispatching events to Flutter through event channel
// if bridge is configured for WebSocket communication
if (Mode == FlutnetBridgeMode.WebSocket)
{
return;
}
FlutnetEventInfo eventInfo = new FlutnetEventInfo
{
InstanceId = e.ServiceName,
EventName = e.EventName.FirstCharLower(),
EventData = e.EventData
};
NSObject eventValue = FlutterInterop.ToMethodChannelResult(eventInfo);
// As stated here https://docs.microsoft.com/en-US/xamarin/essentials/main-thread#determining-if-code-is-running-on-the-main-thread:
// The platform implementations of BeginInvokeOnMainThread themselves check if the call is made on the main thread.
// There is very little performance penalty if you call BeginInvokeOnMainThread when it's not really necessary.
if (!MainThread.IsMainThread)
{
MainThread.BeginInvokeOnMainThread(() =>
{
try
{
_streamHandler.EventSink?.Invoke(eventValue);
}
catch (Exception ex)
{
// TODO: Properly log any error
Console.WriteLine(ex.Message);
}
});
}
else
{
try
{
_streamHandler.EventSink?.Invoke(eventValue);
}
catch (Exception ex)
{
// TODO: Properly log any error
Console.WriteLine(ex.Message);
}
}
}
private void SendError(FlutnetMethodInfo methodInfo, PlatformOperationException exception)
{
FlutnetMessage message = new FlutnetMessage
{
MethodInfo = methodInfo,
// NOTE: Please consider removing ErrorCode and ErrorMessage
ErrorCode = FlutnetErrorCode.OperationFailed,
ErrorMessage = exception.Message,
Exception = exception
};
NSObject dartReturnValue = FlutterInterop.ToMethodChannelResult(message);
Console.WriteLine("Sending error to Flutter...");
MainThread.BeginInvokeOnMainThread(() => _methodChannelIncoming.InvokeMethod("error", dartReturnValue));
}
private void SendResult(FlutnetMethodInfo methodInfo, object result)
{
Dictionary <string, object> resultValue = new Dictionary <string, object>();
resultValue.Add("ReturnValue", result);
FlutnetMessage message = new FlutnetMessage
{
MethodInfo = methodInfo,
Result = resultValue
};
NSObject dartReturnValue = FlutterInterop.ToMethodChannelResult(message);
Console.WriteLine("Sending result to Flutter...");
MainThread.BeginInvokeOnMainThread(() => _methodChannelIncoming.InvokeMethod("result", dartReturnValue));
}
private void FlutnetRuntimeOnPlatformEvent(object sender, OnPlatformEventArgs e)
{
// Prevent dispatching events to Flutter through event channel
// if bridge is configured for WebSocket communication
if (Mode == FlutnetBridgeMode.WebSocket)
{
return;
}
FlutnetEventInfo eventInfo = new FlutnetEventInfo
{
InstanceId = e.ServiceName,
EventName = e.EventName.FirstCharLower(),
EventData = e.EventData
};
Object eventValue = FlutterInterop.ToMethodChannelResult(eventInfo);
if (!MainThread.IsMainThread)
{
MainThread.BeginInvokeOnMainThread(() =>
{
try
{
_streamHandler.EventSink?.Success(eventValue);
}
catch (Exception ex)
{
// TODO: Properly log any error
Console.WriteLine(ex.Message);
}
});
}
else
{
try
{
_streamHandler.EventSink?.Success(eventValue);
}
catch (Exception ex)
{
// TODO: Properly log any error
Console.WriteLine(ex.Message);
}
}
}
private void HandleMethodCall(FlutterMethodCall call, FlutterResult callback)
{
// Return an error if Flutter is invoking method calls through method channel
// when bridge is configured for WebSocket communication
if (Mode == FlutnetBridgeMode.WebSocket)
{
callback(ConstantsEx.FlutterMethodNotImplemented);
return;
}
// Extract target method information from MethodCall.Method
FlutnetMethodInfo methodInfo;
NSObject dartReturnValue;
try
{
methodInfo = JsonConvert.DeserializeObject <FlutnetMethodInfo>(call.Method, FlutterInterop.JsonSerializerSettings);
dartReturnValue = FlutterInterop.ToMethodChannelResult(0);
}
catch (Exception ex)
{
callback(FlutterError.Create(FlutnetErrorCode.OperationNotImplemented.ToString(), ex.Message, null));
return;
}
// Send an empty - successful - response to immediately free Flutter thread
callback(dartReturnValue);
nint[] taskId = new nint[1];
taskId[0] = UIApplication.SharedApplication.BeginBackgroundTask(() =>
{
FlutnetException error = new FlutnetException(FlutnetErrorCode.OperationCanceled);
MainThread.BeginInvokeOnMainThread(() => SendError(methodInfo, error));
UIApplication.SharedApplication.EndBackgroundTask(taskId[0]);
});
// Run the call in Background
Task.Run(() =>
{
BackgroundHandleMethodCall(methodInfo, call);
UIApplication.SharedApplication.EndBackgroundTask(taskId[0]);
});
}
