Android url download calculate progress?

Question

I have made a download method that works fine. It takes a String url and returns the downloaded InputStream which gets processed by XMLPullParser. Now I want to add a progressbar to the download. I have figured out that I can somehow use getContentLength() on HttpURLConnection but I do not know how to calculate the progressbar after that.

This is my code:

public static InputStream downloadUrl(String urlString) throws IOException {
    URL url = new URL(urlString);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setReadTimeout(15000);
    conn.setConnectTimeout(25000);
    conn.setRequestMethod("GET");
    conn.setDoInput(true);
    conn.setUseCaches(true);
    conn.setRequestProperty("Content-Type", "application/xml; charset=utf-8");
    conn.setRequestProperty("Accept", "application/xml");
    conn.connect();
    int size = conn.getContentLength();
    InputStream stream = conn.getInputStream();

            //calculate the progress

    return stream;      
}

Thanks!

Please use the search before posting questions that have already been answered. [Here you go](http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog) — cwin, Jun 15 '13 at 13:08
I have seen those but non of them actually returns an `InputStream` after the download which my parser needs. Or have I missed something? — TutenStain, Jun 15 '13 at 13:18

score 2 · Accepted Answer · answered Jun 15 '13 at 13:37

If you need to parse the content afterwards, you have (at least) two options:

Keep track of current position in the stream, as suggested in that Google groups answer. You have then an accurate progress as it represents both parsing and downloading progress.
Download the stream to a temp file (and show progress for that) and then you pass a FileInputStream to your parser (and show some more progress if required, but that should be fast compared to the download, you could consider downloading as 90% of the progress and parsing as the remaining 10% for instance).

Android url download calculate progress?

1 Answers1