开发落网电台windows phone 8应用的计划(4)

昨天把应用的后台播放代理搞定了，但是运行的状况不太好，在网络不好的情况下有时候会崩溃，更多的时候是没有声音。

现在的任务就有两个了：一个是搞定网络，这部分还没有一个很好的计划，因为前台UI和后台播放代理的通信我还没有想到很好的办法，能想到的方法是借助backgroundPlayer的调用来解决，不过这就限制了后期功能的扩展，不过可能就先这么做吧；第二个是怎么处理好缓冲的问题。

先把后台代理放在这上面吧，还是简单版本。参照了csdn的做法，没有做网络。

using System;
using System.Diagnostics;
using System.Windows;
using Microsoft.Phone.BackgroundAudio;
using System.Collections.Generic;
using System.Threading;
namespace LuooAudioPlayerAgent
{
    public class AudioPlayer : AudioPlayerAgent
    {
        #region 字段
        static int currentTrackNumber=0;
        public static int totalNumber;
        private static List<AudioTrack> playList=new List<AudioTrack>()
        {
            new AudioTrack(new Uri("http://luoo.800edu.net/low/luoo/radio587/01.mp3",UriKind.Absolute),"1","","",null),
            new AudioTrack(new Uri("http://luoo.800edu.net/low/luoo/radio587/02.mp3",UriKind.Absolute),"2","","",null),
            //new AudioTrack(new Uri("http://luoo.800edu.net/low/luoo/radio587/03.mp3",UriKind.Absolute),"","","",null),
            //new AudioTrack(new Uri("http://luoo.800edu.net/low/luoo/radio587/04.mp3" , UriKind.Absolute) , "" , "" , "" , null)
        };
        #endregion

        static AudioPlayer()
        {
            //GetList();
            
            Deployment.Current.Dispatcher.BeginInvoke(delegate
            {
                Application.Current.UnhandledException += UnhandledException;
            });
        }

        #region 出现未处理的异常时执行的代码
        private static void UnhandledException( object sender , ApplicationUnhandledExceptionEventArgs e )
        {
            if(Debugger.IsAttached)
            {
                // 出现未处理的异常；强行进入调试器
                Debugger.Break();
            }
        }
        #endregion

        protected override void OnPlayStateChanged( BackgroundAudioPlayer player , AudioTrack track , PlayState playState )
        {
            switch(playState)
            {
                case PlayState.TrackEnded:
                    PlayNextTrack(player);
                    break;
                case PlayState.TrackReady:
                    player.Play();
                    break;
            }
            NotifyComplete();
        }

        protected override void OnUserAction( BackgroundAudioPlayer player , AudioTrack track , UserAction action , object param )
        {
            switch(action)
            {
                case UserAction.Play:
                    if(player.Track==null) player.Track=playList[currentTrackNumber];
                    player.Play();
                    break;
                
                case UserAction.Pause:
                    player.Pause();
                    break;
                
                case UserAction.SkipNext:
                    PlayNextTrack(player);
                    break;

                case UserAction.SkipPrevious:
                    PlayPreviousTrack(player);
                    break;

                //case UserAction.FastForward:
                //    GetList();
                //    break;
            }
            NotifyComplete();
        }

        #region  control

        private void PlayNextTrack( BackgroundAudioPlayer player )
        {
            if(++currentTrackNumber >=playList.Count)
            {
                currentTrackNumber = 0;
            }
            player.Track=playList[currentTrackNumber];
            
        }

        private void PlayPreviousTrack( BackgroundAudioPlayer player )
        {
            if(--currentTrackNumber < 0)
            {
                currentTrackNumber = playList.Count - 1;
            }
            player.Track=playList[currentTrackNumber];
            
        }

        

        #endregion

    
        protected override void OnError( BackgroundAudioPlayer player , AudioTrack track , Exception error , bool isFatal )
        {
            if(isFatal)
            {
                Abort();
            }
            else
            {
                NotifyComplete();
            }

        }

        protected override void OnCancel()
        {

        }

        public static void GetList()
        {
            playList.Add(new AudioTrack(new Uri("http://luoo.800edu.net/low/luoo/radio587/04.mp3" , UriKind.Absolute) , "4" , "" , "" , null));
            //playList.Add(new AudioTrack(new Uri("http://luoo.800edu.net/low/luoo/radio587/02.mp3" , UriKind.Absolute) , "" , "" , "" , null));
            //playList.Add(new AudioTrack(new Uri("http://luoo.800edu.net/low/luoo/radio587/03.mp3" , UriKind.Absolute) , "" , "" , "" , null));
            //totalNumber=playList.Count;
        }
    }
}