Delete unplayable video from cache

Occasionally find that a video from a certain URL isn't able to play. I have not been able to figure out why, but the solution I know will work is to be able to purge this particular file from disk-cache.

How can I do this, just after it throws the Exception?

issue 中没有指定文件、测试或入口点。首先跟踪 AndroidVideoCache 如何将视频 URL 映射到磁盘缓存文件，以及播放异常如何传递到缓存层；完成标准是，异常发生后可以清除失败 URL 的缓存文件，并且可以再次获取视频。

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