Pause/Resume http connection download

Question

I want to be able to open a http connection to a given file in Android and start downloading it. I also have to be able to pause the download at some point and resume it later. How is this achieved in Android? I don't want to start the download all over again.

Horaciohorae

Have you see this #6237579 – Aperient

@Aperient great thanks! If you post this as an answer I can accept it and close this one. – Horaciohorae

Answer 1

Such a downloader has been posted here:

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    if(ISSUE_DOWNLOAD_STATUS.intValue()==ECMConstant.ECM_DOWNLOADING){
        File file=new File(DESTINATION_PATH);
        if(file.exists()){
             downloaded = (int) file.length();
             connection.setRequestProperty("Range", "bytes="+(file.length())+"-");
        }
    }else{
        connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
    }
    connection.setDoInput(true);
    connection.setDoOutput(true);
    progressBar.setMax(connection.getContentLength());
     in = new BufferedInputStream(connection.getInputStream());
     fos=(downloaded==0)? new FileOutputStream(DESTINATION_PATH): new FileOutputStream(DESTINATION_PATH,true);
     bout = new BufferedOutputStream(fos, 1024);
    byte[] data = new byte[1024];
    int x = 0;
    while ((x = in.read(data, 0, 1024)) >= 0) {
        bout.write(data, 0, x);
         downloaded += x;
         progressBar.setProgress(downloaded);
    }

Aperient

Can you explain what's happening on the Code? – Footsie

code first check if there is downloaded bytes on storage as file, for example you downloaded 120 byte, it will set request for connection and only asked for 120 to end of file. another part is setting progress to connection length . thats easy part. – Gummous

what if there is download from other range? for example 120 to 240, and we dont want to have 2 connections ( to get from 0 to 121, 241 to end ) ??? this will happen in multi connection downloads. – Gummous