android - Thumbnail image is null when listing file from Google Drive -
in same activity, used following code information related file, , file.getthumbnail() show encoded data, know.
private static void printfile(drive service, file file) { system.out.println("title: " + file.gettitle()); system.out.println("getthumbnail: " + file.getthumbnail()); } but in activity (i use intent transfer), when list folder google drive, file.getthumbnail() null (use method printfile() again). i don't know why? following code listing files specified folder, successfull :
private void listfile(final drive service, final string folderid) { new thread(new runnable() { @override public void run() { files.list request; try { request = service.files().list(); // set id of specified folder request.setq(folderid); { try { filelist filelist = request.execute(); request.setpagetoken(filelist.getnextpagetoken()); // implement : list of files (file file : filelist.getitems()) { printfile(service, file); // todo thumb nail in here inputstream = downloadthumbnailfile(managefiledriveactivity.mdriveservice, file); // don't need note method, because file.getthumnail() null } } catch (final ioexception e) { request.setpagetoken(null); } } while (request.getpagetoken() != null && request.getpagetoken().length() > 0); } catch (final ioexception e1) { } } }).start(); } p/s : - get file - file resource
please tell me how get thumb nail image successful. thanks!
update use following code, solution :
public static inputstream downloadthumbnailfile(drive service, file file) throws ioexception { if (file.getthumbnaillink() != null && !file.getthumbnaillink().isempty()) { try { system.out.println("getthumbnaillink: " + file.getthumbnaillink()); httpresponse resp = service.getrequestfactory() .buildgetrequest(new genericurl(file.getthumbnaillink())) .execute(); return resp.getcontent(); } catch (ioexception e) { // error occurred. e.printstacktrace(); return null; } } else { // file doesn't have content stored on drive. return null; } }
use file.getthumbnaillink(). thumbnail attribute write-only.
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