问题
I have used Google Document Viewer to open PDF files in my Android device. A black screen with "No Preview Available" text is shown, instead of opening my PDF files. I have tested with sample PDF files from Google. They are working fine, but not my PDF files. Is there anything that i need to do from code side to view my PDF.
http://docs.google.com/viewer?url=myurl.pdf
回答1:
Had a file that showed this problem. Renamed it to remove blanks in the file name, updated my link and it worked. Note that blanks were properly HTML encoded as %20 so this 'fix' shouldn't be necessary. But, I can't argue with success. Good luck.
回答2:
Finally solved this issue. Issue is there in url. In url I replaced %2 to %252 then after 1 week I solved this issue.
In short I want to encode query string.
if (Url != null && Url.contains("=")) {
String Urll =Url.substring(Url.lastIndexOf("&Signature=") + 1).replace("%2B", "%252B");
if (null != Urll && Urll.length() > 0 && Urll.contains("%252B")) {
int endIndex = Url.lastIndexOf("Signature");
if (endIndex != -1) {
Url = Url.substring(0, endIndex);
Url = Url + Urll;
}
}
Url = Url.replace("?AWSAccessKeyId=", "?AWSAccessKeyId%3D")
.replace("&Expires=", "%26Expires%3D").replace("&Signature=", "%26Signature%3D");
}
来源：https://stackoverflow.com/questions/28918608/google-document-viewer-shows-no-preview-available