private async Task StartInBackground()
{
try
{
_backgroundService = _backgroundServiceCreationFunc();
await _backgroundService.StartAsync();
using (var powerService = ApplicationContext.GetSystemService(PowerService) as PowerManager)
{
if (powerService == null)
{
return;
}
_wakeLock = powerService.NewWakeLock(WakeLockFlags.Partial, _serviceName);
}
AcquireWakelock();
if (_hasPeriodicTask)
{
StartHandlerThread();
}
}
catch (Exception e)
{
Android.Util.Log.Error(_serviceName, e.ToString());
}
}
/// <inheritdoc />
public override void OnCreate()
{
base.OnCreate();
_actionMainActivity = $"{Application.PackageName}.show_main_activity";
_notificationManager = GetSystemService(NotificationService) as NotificationManager;
if (_notificationManager == null)
{
throw new Exception("Unable to get NotificationManager in NativeBackgroundService");
}
// Create notification channel
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
var notificationChannel = new NotificationChannel(_builder.ChannelId,
_builder.ChannelName, _builder.NotificationImportance)
{
LockscreenVisibility = _builder.NotificationVisibility
};
_notificationManager.CreateNotificationChannel(notificationChannel);
}
_backgroundService = _builder.Build();
var periodicServices = _backgroundService.GetPeriodicServices();
foreach (var(periodicService, period) in periodicServices)
{
_backgroundServiceTasks.Add(new BackgroundServiceTask(periodicService, period));
}
}
private async Task BackgroundTaskAsync()
{
try
{
_backgroundService = _backgroundServiceCreationFunc();
await _backgroundService.StartAsync();
_messagingCenter.Send <object, BackgroundServiceState>(this,
FromBackgroundMessages.BackgroundServiceState, new BackgroundServiceState(true));
while (!_cancellationTokenSource.IsCancellationRequested)
{
try
{
await _backgroundService.PeriodicTaskAsync();
if (!_cancellationTokenSource.IsCancellationRequested)
{
await Task.Delay(_backgroundService.PeriodicServiceCallInterval, _cancellationTokenSource.Token);
}
}
catch (OperationCanceledException)
{
}
}
}
catch (Exception e)
{
Debug.WriteLine(e);
}
}
/// <summary>
/// Constructor
/// </summary>
/// <exception cref="InvalidOperationException"></exception>
public NativeBackgroundServiceHost()
{
_messagingCenter = MessagingCenter.Instance;
if (_backgroundServiceHostBuilder == null)
{
throw new InvalidOperationException("You must call NativeBackgroundServiceHost.Init() before instantiate it");
}
_backgroundService = _backgroundServiceHostBuilder.Build();
}