在应用音频文件之前，先使用AsyncTask在后台线程中下载音频并保存到本地文件系统。然后，将该本地路径作为参数传递给Imgly Video Editor SDK中的音频应用方法。

代码示例：

private class DownloadAudioTask extends AsyncTask {

@Override protected String doInBackground(String... params) {

String url = params[0];
String fileName = params[1];
String path = Environment.getExternalStorageDirectory().toString() + "/" + fileName;

try {
    URLConnection connection = new URL(url).openConnection();
    InputStream inputStream = new BufferedInputStream(connection.getInputStream());
    OutputStream outputStream = new FileOutputStream(path);

    byte data[] = new byte[1024];
    int count;
    while ((count = inputStream.read(data)) != -1) {
        outputStream.write(data, 0, count);
    }

    outputStream.flush();
    outputStream.close();
    inputStream.close();

} catch (Exception e) {
    e.printStackTrace();
}

return path;

}

@Override protected void onPostExecute(String path) { applyAudioToVideo(path); }

}

private void applyAudioToVideo(String audioPath) { Video newVideo = new Video(videoPath); Filter videoResizer = new VideoSizeFilter(SizeConstraint.LIMIT_1080); newVideo.applyFilter(videoResizer);

Filter audioFilter = new AudioFilter(audioPath);
newVideo.addFilter(audioFilter);

newVideo.save(resultPath, new CompletionCallback() {
    @Override
    public void onError(Throwable e) {
        e.printStackTrace();
    }

    @Override
    public void onCompletion(Uri uri) {
        // completed
    }
});

}

其中，videoPath为要编辑的视频路径，resultPath为导出的视频路径。