java - NanoHttpd 服务器无法在 android 上流式传输大型视频

Question

NanoHttpd服务端代码可见here .

我正在使用 NanoHttpd 服务器流式传输大型视频(约 150mb)的服务中启动一个新线程，但它只是在显示加载对话框时暂停。我尝试增加和减少缓冲区读取无济于事。服务器似乎无法在 Android 设备上正常运行。

当我通过桌面应用程序启动服务器时，相同的代码工作正常。我可以流式传输超过 150mb。从手机运行服务器时，我只尝试了 20mb 的文件，它们也很好。但是，我需要流式传输的内容远不止这些。

Answer 1

如果其他人遇到此问题并想查看此解决方案中的实际代码，我将在此处发布我的代码。我正在使用我的 Android 设备从 SD 卡流式传输视频文件以获取 Chromecast 请求。使用此代码，我可以在中间开始流和/或寻找流中的特定位置。

@Override
@SuppressWarnings("deprecation")
public Response serve(String uri, Method method, Map<String, String> headers, Map<String, String> params, Map<String, String> files) {
    String mimeType = getMimeType();
    String currentUri = getCurrentUri();
    if (currentUri != null && currentUri.equals(uri)) {
        String range = null;
        Log.d(TAG, "Request headers:");
        for (String key : headers.keySet()) {
            Log.d(TAG, "  " + key + ":" + headers.get(key));
            if ("range".equals(key)) {
                range = headers.get(key);
            }
        }
        try {
            if (range == null) {
                return getFullResponse(mimeType);
            } else {
                return getPartialResponse(mimeType, range);
            }
        } catch (IOException e) {
            Log.e(TAG, "Exception serving file: " + filePath, e);
        }
    } else {
        Log.d(TAG, "Not serving request for: " + uri);
    }

    return new Response(Response.Status.NOT_FOUND, mimeType, "File not found");
}

private Response getFullResponse(String mimeType) throws FileNotFoundException {
    cleanupStreams();
    fileInputStream = new FileInputStream(filePath);
    return new Response(Response.Status.OK, mimeType, fileInputStream);
}

private Response getPartialResponse(String mimeType, String rangeHeader) throws IOException {
    File file = new File(filePath);
    String rangeValue = rangeHeader.trim().substring("bytes=".length());
    long fileLength = file.length();
    long start, end;
    if (rangeValue.startsWith("-")) {
        end = fileLength - 1;
        start = fileLength - 1
                - Long.parseLong(rangeValue.substring("-".length()));
    } else {
        String[] range = rangeValue.split("-");
        start = Long.parseLong(range[0]);
        end = range.length > 1 ? Long.parseLong(range[1])
                : fileLength - 1;
    }
    if (end > fileLength - 1) {
        end = fileLength - 1;
    }
    if (start <= end) {
        long contentLength = end - start + 1;
        cleanupStreams();
        fileInputStream = new FileInputStream(file);
        //noinspection ResultOfMethodCallIgnored
        fileInputStream.skip(start);
        Response response = new Response(Response.Status.PARTIAL_CONTENT, mimeType, fileInputStream);
        response.addHeader("Content-Length", contentLength + "");
        response.addHeader("Content-Range", "bytes " + start + "-" + end + "/" + fileLength);
        response.addHeader("Content-Type", mimeType);
        return response;
    } else {
        return new Response(Response.Status.RANGE_NOT_SATISFIABLE, HTML_MIME_TYPE, rangeHeader);
    }
}