/// <summary>
/// Hệ thống gọi đến hàm này khi association backgroundtask được bật
/// </summary>
/// <param name="taskInstance"> hệ thống tự tạo và truyền vào đây</param>
public async void Run(IBackgroundTaskInstance taskInstance)
{
//System.Diagnostics.Debug.WriteLine("background run");
taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(BackgroundTaskCanceled);
taskInstance.Task.Completed += new BackgroundTaskCompletedEventHandler(BackgroundTaskCompleted);
_backgroundstarted.Set();//
_deferral = taskInstance.GetDeferral();
//Playlist = new BackgroundPlaylist();
_smtc = initSMTC();
this._foregroundState = this.initForegroundState();
BackgroundMediaPlayer.Current.CurrentStateChanged += BackgroundMediaPlayer_CurrentStateChanged;
//Playlist = await BackgroundPlaylist.LoadBackgroundPlaylist("playlist.xml");
Playlist = new BackgroundPlaylist();
Playlist.ListPathsource = await BackgroundPlaylist.LoadCurrentPlaylist(Constant.CurrentPlaylist);
if (_foregroundState != eForegroundState.Suspended)
{
ValueSet message = new ValueSet();
message.Add(Constant.BackgroundTaskStarted, "");
BackgroundMediaPlayer.SendMessageToForeground(message);
}
Playlist.TrackChanged += Playlist_TrackChanged;
BackgroundMediaPlayer.MessageReceivedFromForeground += BackgroundMediaPlayer_MessageReceivedFromForeground;
BackgroundMediaPlayer.Current.MediaEnded +=Current_MediaEnded;
ApplicationSettingHelper.SaveSettingsValue(Constant.BackgroundTaskState, Constant.BackgroundTaskRunning);
isbackgroundtaskrunning = true;
_loopState = eLoopState.None;
}
private void Playlist_TrackChanged(BackgroundPlaylist sender, object args)
{
if (this._foregroundState != eForegroundState.Suspended)
{
var msg = new ValueSet();
msg.Add(Command.Titte, Playlist.Name);
BackgroundMediaPlayer.SendMessageToForeground(msg);
}
}
public static async Task<BackgroundPlaylist> LoadBackgroundPlaylist(string path)
{
var file = await ApplicationData.Current.LocalCacheFolder.GetFileAsync(path);
Stream stream = await file.OpenStreamForReadAsync();
List<string> filepath = null;
int currentindex= -1;
using (XmlReader reader = XmlReader.Create(stream))
{
//reader.ReadStartElement("Playlist");
reader.Read();
while (reader.NodeType != XmlNodeType.EndElement || reader.Name != "Playlist")
{
reader.Read();
if (reader.IsStartElement("CurrentIndex"))
{
reader.Read();
currentindex = Int32.Parse(reader.Value);
continue;
}
if (reader.IsStartElement("List"))
{
filepath = readFilelist(reader);
}
}
}
stream.Dispose();
BackgroundPlaylist bgPlaylist = new BackgroundPlaylist();
bgPlaylist.ListPathsource = filepath;
bgPlaylist.Currentindex = currentindex;
return bgPlaylist;
}