private void readResponseHeaders(HttpURLConnection conn) {
info.disposition = conn.getHeaderField("Content-Disposition");
info.location = conn.getHeaderField("Content-Location");
info.mimeType = DLUtil.normalizeMimeType(conn.getContentType());
final String transferEncoding = conn.getHeaderField("Transfer-Encoding");
if (TextUtils.isEmpty(transferEncoding)) {
try {
info.totalBytes = Integer.parseInt(conn.getHeaderField("Content-Length"));
LogUtils.e("安装包的大小：" + info.totalBytes);
} catch (NumberFormatException e) {
info.totalBytes = -1;
}
} else {
info.totalBytes = -1;
}
if (info.totalBytes == -1
&& (TextUtils.isEmpty(transferEncoding) || !transferEncoding.equalsIgnoreCase("chunked")))
throw new RuntimeException("Can not obtain size of download file.");
if (TextUtils.isEmpty(info.fileName))
info.fileName = DLUtil.obtainFileName(info.realUrl, info.disposition, info.location);
}
