Playing local video in WebView on Android

问题:

I'm building an app with a WebView thats supposed to play a video, that's saved locally. Strangely the video player is not working with local video files. It does play videos saved on a server though.

The local files (html and video) are saved in a folder assets/html_test

Here are the files.

HTML

<div class="video-container">
  <p>Server</p>
  <video poster="video/star.png" controls>
    <source src="http://broken-links.com/tests/media/BigBuck.m4v" />
  </video>
</div>

<div class="video-container">
  <p>local</p>
  <video poster="video/star.png" controls>
    <source src="BigBuck.m4v" />
  </video>
</div>

onCreate in Activity

WebView browser = (WebView) findViewById(R.id.browser);

WebSettings webSettings = browser.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setPluginState(WebSettings.PluginState.ON_DEMAND);
webSettings.setAllowFileAccessFromFileURLs(true);

browser.setWebChromeClient(new WebChromeClient());

browser.loadUrl("file:///android_asset/html_test/video.html");

The first video works, the second one doesn't. I tried different values for the source, neither of them worked for me:

<source src="BigBuck.m4v" />
<source src="file:///android_asset/html_test/BigBuck.m4v" />

Not sure if this is related, but as soon as I press play, logcat puts out this:

01-07 12:19:18.073: E/MediaPlayer(32542): error (1, -2147483648)
01-07 12:19:18.073: E/MediaPlayer(32542): Error (1,-2147483648)

I have no clue what the problem is here. Any help would be much appreciated.

回答1:

Slartibartfasts helped me solve this. Since it's just a comment, I'll have to post it myself.

Essentially it's a permission problem. Here is the link he posted. The suggested method for copying files with MODE_WORLD_READABLE is deprecated, use the method described in the link below and save the files in the external storage

I had to copy the files to the external storage, and access the video file there. Since the path to the external storage is different within the several versions of android, I copied the all relevant HTML files (including all JS, graphics and video files). See copying files, scroll down for the answer if you have sub folders.

Here are my copying methods:

private void copyAssets(String path)
{
    String[] files = null;

    try
    {
        files = getAssets().list(path);
    } catch (IOException e)
    {
        e.printStackTrace();
    }

    if (files.length == 0)
        copyFile(path);
    else
    {
        File dir = new File(getExternalFilesDir(null), path);

        if (!dir.exists())
            dir.mkdir();

        for (int i = 0; i < files.length; i++)
        {
            copyAssets(path + "/" + files[i]);
        }
    }
}

private void copyFile(String filename)
{
    InputStream in = null;

    File file;
    OutputStream out = null;

    try
    {
        in = getAssets().open(filename);
    } catch (IOException e)
    {
        Log.e(TAG, "ERROR WITH in = getAssets().open: " + filename);
        e.printStackTrace();
    }

    file = new File(getExternalFilesDir(null), filename);

    try
    {
        out = new FileOutputStream(file);
    } catch (FileNotFoundException e)
    {
        Log.e(TAG, "ERROR WITH out = new FileOutputStream(file);");
        e.printStackTrace();
    }

    byte[] data;

    try
    {
        data = new byte[in.available()];

        in.read(data);
        out.write(data);

        in.close();
        out.close();
    } catch (IOException e1)
    {
        e1.printStackTrace();
    }
}

In my onCreate I call

copyAssets("matrix");

with matrix being the folder in my assets thats holding all files and sub folders.