public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
cancellationTokenSource = new CancellationTokenSource();
Task.Run(() =>
{
try
{
// Shared code is invoked here
var sender = new MobileApp.Services.BackgroundTaskService();
sender.ProcessAsync(cancellationTokenSource.Token).Wait();
}
catch (OperationCanceledException)
{
}
finally
{
if (cancellationTokenSource.IsCancellationRequested)
{
var message = new CancelledMessage();
Device.BeginInvokeOnMainThread(
() => MessagingCenter.Send(message, "CancelledMessage")
);
}
}
}, cancellationTokenSource.Token);
return(StartCommandResult.Sticky);
}
public async Task Start()
{
cancellationTokenSource = new CancellationTokenSource();
taskId = UIApplication.SharedApplication.BeginBackgroundTask("LongRunningTask", OnExpiration);
try
{
// Shared code is invoked here
var sender = new MobileApp.Services.BackgroundTaskService();
await sender.ProcessAsync(cancellationTokenSource.Token);
}
catch (OperationCanceledException)
{
// only used to stop execution
}
finally
{
if (cancellationTokenSource.IsCancellationRequested)
{
var message = new CancelledMessage();
Device.BeginInvokeOnMainThread(
() => MessagingCenter.Send(message, "CancelledMessage")
);
}
}
UIApplication.SharedApplication.EndBackgroundTask(taskId);
}
