的MPMoviePlayerController不会在后台播放时，下一个网址

我正在开发iOS应用程序中，我使用的MPMoviePlayerController流.mp3文件。
当一个文件就完成了打我拿下URL和播放文件。
所有工作在前景很好，但是当我移动应用背景当前歌曲播放以及但是当它结束后，没有得到执行起着下一首歌曲的方法。

I am developing an iOS app in which I am streaming .mp3 files using MPMoviePlayerController. When playing of one file completes I take next url and play the file. All works great in foreground but when I move the app to background the current song plays well but when it finishes, the method which plays the next song doesn't get executed.

我查了计算器类似的问题，但解决方案似乎并没有为我工作。

I checked similar questions on stackoverflow but the solutions doesn't seem to work for me.

在正确的方向Any指针将是非常有益的。

Any pointer in the right direction will be very helpful.

在此先感谢！

修改：在不同的设备上测试应用我发现功能正在开发的iOS 5.1，但不是在的iOS 4.3。所以我creted起着上完成previous一个本地文件的示例应用程序，该应用程序正确地完成它的工作在iOS中的所有版本，即使在background.Its现在已经变得更加扑朔迷离我。

EDIT :On testing the app on different devices I found that the functionality is working on iOS 5.1 but not in iOS 4.3. So I creted a sample app which plays a local file on finishing the previous one and that app does its job correctly in all versions of iOS even when in background.Its now have become more confusing for me.