Java – HTTP async downloader automatically recovered in case of error

There is an asynchronous downloader in my application, but sometimes the connection is lost, especially when I am on a mobile connection and the file is large (> 10 MB)

This is an asynchronous task doinbackground:

protected String doInBackground(String... aurl) {
    int count;

    try {

        URL url = new URL(aurl[0]);
        URLConnection conexion = url.openConnection();
        // conexion.setRequestProperty("Range","bytes=" + downloaded + "-");
        conexion.connect();

        int lenghtOfFile = conexion.getContentLength();
        pesoVideo = lenghtOfFile / 1048576;
        output = "/sdcard/" + folderString + "/" + nomeFile + ".mp3";
        InputStream input = new BufferedInputStream(url.openStream());
        OutputStream output = new FileOutputStream(
        VideoDownloaderBrowserActivity.this.output);

        byte data[] = new byte[1024];
        long total = 0;

        while ((count = input.read(data)) != -1) {
            total += count;
            publishProgress("" + (int) ((total * 100) / lenghtOfFile));
            output.write(data,count);
        }

        output.flush();
        output.close();
        input.close();

    } catch (Exception e) {
    }

    return null;
}

This is onprogressupdate:

protected void onProgressUpdate(String... progress) {
    if (Integer.parseInt(progress[0]) > progresso) {
        ...
    }
}

Solution

This is a thread to discuss the recoverable download in Android under API 9 Otherwise, downloadmanager is also a good choice for newer versions

Basically, you need to enable byte service on the server to allow recoverable downloads