从应用程序缓存目录播放视频 [英] Playing video from app cache dir

问题描述

任何人都可以解释为什么下载/从我的应用程序缓存目录播放视频不工作，但是，下载/播放从我的SD卡相同的视频确实工作？

Can anyone explain why downloading/playing a video from my applications cache directory does not work, but downloading/playing the same video from my sdcard does work?

注：本视频下载。我保存到内存中调用之前 VideoView.setVideoPath（...）。

Note: this video is being downloaded. I am saving to memory before calling VideoView.setVideoPath(...).

// Works
File file = new File(Environment.getExternalStorageDirectory(), "vid-test.3gp");

// Does not work
File file = new File(getCacheDir(), "vid-test.3gp");

在每一种情况下有问题的文件的确实存在。

In each case the file in question does exist.

如果我试图调用 VideoView.setVideoURI（...）和流的视频，我的 VideoView ，被击中而错过它是否会奏效。

If I attempt to call VideoView.setVideoURI(...) and "stream" the video to my VideoView, it is hit and miss whether or not it will work.

任何人都可以解释这种现象？

Can anyone explain this behavior?

推荐答案

这可能是一个权限问题。下面是一个工作剪断：

It's probably a permission issue. Here is a working snipped:

InputStream in = connection.getInputStream();

File file = new File(getApplicationContext().getCacheDir() ,fileName);

if(!file.exists()){
    file.setReadable(true);

    file.createNewFile();


    if (file.canWrite()){

        FileOutputStream out = new FileOutputStream(file);   

        byte[] buffer = new byte[1024];
        int len1 = 0;
        while ( (len1 = in.read(buffer)) > 0 ) {
            out.write(buffer,0, len1);
        }

        out.close();
    }

    in.close();

    Runtime.getRuntime().exec("chmod 755 "+getCacheDir() +"/"+ fileName);                       

}

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