fix Android downloadFile overflow contentLength and bytesWritten #583
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On Android downloadFile will get overflown and contentLength return -1 if downloading large size file over 3GB.
I switched to use
longinstead ofint; and using getContentLengthLong instead of getContentLength to support big file size.The content length of the resource that this connection's URL references, -1 if the content length is not known, or if the content length is greater than Integer.MAX_VALUE.
https://docs.oracle.com/javase/7/docs/api/java/net/URLConnection.html#getContentLength()