void UpdateDownloadInfo(DownloadInfo downloadInfo, DownloadInfo.STATUS status, NSUrl destinationUrl)
{
if (downloadInfo == null)
{
return;
}
downloadInfo.Status = status;
downloadInfo.DestinationFilename = Path.GetFileName(destinationUrl.AbsoluteString);
}
/// <summary>
/// Plays the MP3 associated with the download. Stops output first.
/// </summary>
/// <param name="downloadInfo">Download info.</param>
public void PlayAudio(DownloadInfo downloadInfo)
{
this.StopAudio();
if (downloadInfo == null)
{
return;
}
Console.WriteLine("Playing file '{0}'.", downloadInfo.DestinationFilename);
if (!File.Exists(downloadInfo.FullDestinationFilePath))
{
Console.WriteLine("Cannot find file '{0}'!", downloadInfo.FullDestinationFilePath);
return;
}
NSError error = null;
// Use AVAudioPlayer to load the MP3 file and start playing.
this.audioPlayer = new AVAudioPlayer(NSUrl.FromFilename(downloadInfo.FullDestinationFilePath), "mp3", out error);
if (error == null)
{
audioPlayer.Play();
this.stopBtn.Enabled = true;
// Update information about currently played song.
MPNowPlayingInfoCenter.DefaultCenter.NowPlaying = new MPNowPlayingInfo
{
Artist = downloadInfo.Artist,
Title = downloadInfo.Title
};
// Update selection in the table view.
this.TableView.SelectRow(NSIndexPath.FromRowSection(this.currentSongIndex, 0), true, UITableViewScrollPosition.Middle);
}
else
{
Console.WriteLine("Error playing back audio: " + error);
}
}
/// <summary>
/// Gets called by iOS if all pending transfers are done. This will only be called if the app was backgrounded.
/// </summary>
public override void DidFinishEventsForBackgroundSession(NSUrlSession session)
{
// Nothing more to be done. This is the place where we have to call the completion handler we get passed in in AppDelegate.
var handler = AppDelegate.BackgroundSessionCompletionHandler;
AppDelegate.BackgroundSessionCompletionHandler = null;
if (handler != null)
{
Console.WriteLine("Calling completion handler.");
NSOperationQueue.MainQueue.AddOperation(() =>
{
this.controller.TableView.ReloadData();
var alert = new UIAlertController
{
Message = "Selected files have been downloaded."
};
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
controller.PresentViewController(alert, true, null);
// Bring up a local notification to take the user back to our app.
Console.WriteLine("Posting notification.");
var notif = new UILocalNotification {
AlertBody = "Xamarin news: All pending files have been downloaded!"
};
UIApplication.SharedApplication.PresentLocalNotificationNow(notif);
// Start playback if download has finished. This is only possible if UIApplication.SharedApplication.BeginReceivingRemoteControlEvents () is called (which is done in MusicListController).
if (this.firstCompletedDownload != null)
{
this.controller.PlayAudio(this.firstCompletedDownload);
this.firstCompletedDownload = null;
}
// Invoke the completion handle. This will tell iOS to update the snapshot in the task manager.
handler.Invoke();
});
}
}
