从应用程序缓存目录播放视频

发布于 2024-11-29 02:39:17 字数 490 浏览 0 评论 0原文

谁能解释为什么从我的应用程序缓存目录下载/播放视频不起作用，但从我的 SD卡下载/播放相同的视频却起作用？

注：该视频正在下载中。我在调用 VideoView.setVideoPath(...) 之前保存到内存。

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

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

在每种情况下，相关文件确实存在。

如果我尝试调用 VideoView.setVideoURI(...) 并将视频“流式传输”到我的 VideoView，则无论是否有效，都可能会失败。

谁能解释这种行为？

原文

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?

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");

In each case the file in question does exist.

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.

Can anyone explain this behavior?

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蓝眸 2024-12-06 02:39:17

这可能是一个权限问题。这是一个工作片段：

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);                       

}

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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