Measuring Download Speed with Java/Android

I am working on an Android app where I need to, as accurately as possible, measure the download speed of the current connection. Here's the best method I could find so far (basically I start a timer, start downloading a Linux distro from a fast server, download around 200 kbytes, then stop the timer and check time elapsed and total bytes downloaded):

try{                
    InputStream is = new URL("http://www.domain.com/ubuntu-linux.iso").openStream();
    byte[] buf = new byte[1024];
    int n = 0;              
    startBytes = TrafficStats.getTotalRxBytes(); /*gets total bytes received so far*/
    startTime = System.nanoTime();
    while(n<200){
        is.read(buf);
        n++;                
    }
    endTime = System.nanoTime();
    endBytes = TrafficStats.getTotalRxBytes(); /*gets total bytes received so far*/
    totalTime = endTime - startTime;
    totalBytes = endBytes - startBytes;
}
catch(Exception e){
    e.printStackTrace();
}   

After that I just need to divide the number of bytes transferred by the time taken and it will give the download speed in bps.

Questions: 1. Will this method be accurate? 2. Do you know a better one?

Thanks a lot.