所以，我打从外部存储器（SD卡）的视频，我在播放视频时的一个问题，这是我的code：

So I'm playing a video from external storage(sdcard), I'm having a problem with playing the video and this is my code:

Uri uri = Uri.parse(url);
intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "video/*");

提示抱歉，该视频无法播放，但在标准Android播放器，它是可玩的。我打印的网址，这是我的了：

It prompts "Sorry, this video cannot be played", but in regular android player, it is playable. I printed the url and this is what I got:

VideoPlayer url: file:///mnt/sdcard/foldername/video-2012-12-26-21-26--44.mp4

时它与URI的问题吗？如果没有，你可以点我到正确的方向。另外，如果我尝试有一个点一个文件夹名（）。我将有一个问题？

Is it a problem with the uri? If no, can you point me to the right direction. Also if I try a foldername that have a dot(.) will I have a problem?

url = file:///mnt/sdcard/Android/data/com.example.project/video-2012-12-26-21-26--44.mp4

感谢。

编辑：由于我的真正的问题不解决，没有人希望再回答，我打开了一个新的问题：Android:视频从画廊可玩的，但是当我使用Intent.ACTION_VIEW类型的视频玩它，不能发挥

Since my real problem was not solve, and nobody want to answer anymore, I open up a new question: Android: Video is playable from gallery but when I play it using Intent.ACTION_VIEW type video, cannot play

部分回答我的问题：

出现问题的原因命名约定。我认为球员不接受，其文件名称 - 在里面。于是我通过更改文件名格式解决了这个问题。

The problem occurs because of naming convention. I think the player doesn't accept file names that have "--" in it. So I solved this problem by changing the file name format.

//声明：我没有一个完整的解释和来源，但这些信息只是从我的解决方法推导出

//Disclaimer: I don't have a full explanation and source but this info is just deduced from my workaround.

推荐答案

请确保您传递正确的SD卡路径意图。最好的办法是使用Environment.getExternalStorageDirectory()获取SDCARD路径而不是静态传递字符串：

make sure you are passing right sdcard path with Intent. best way is use Environment.getExternalStorageDirectory() for getting SDCARD path instead of passing static string :

intent = new Intent(Intent.ACTION_VIEW);

File sdCard = Environment.getExternalStorageDirectory();
File file = new File(sdCard, "/foldername/video-2012-12-26-21-26-44.mp4");

intent.setDataAndType(Uri.fromFile(file), "video/*");

startActivity(intent);