Calculate estimated remaining download time

Question

I have a code which download file from URL.
I have a two parameters that calculated all time for downloading :

Long start = System.nanoTime();
// downloading...
Long end = System.nanoTime();

I need to measure estimated remaining time to end of downloading. How i can do that?

Answer 1

It was simply, sorry 4 your time.

For future searchers :

When you start downloading save timestamp :

Long startTime = System.nanoTime();

to calculate average remaining speed :

 Long elapsedTime = System.nanoTime() - startTime;
 Long allTimeForDownloading = (elapsedTime * allBytes / downloadedBytes);
 Long remainingTime = allTimeForDownloading - elapsedTime;