Android String.format() Returns Question Mark (??) [FIXED] -


i have app downloads files internet. source file name dynamically generated depending on user selection. use following method create source file name. note fileid integer (1-99).

final string filename = "file_" + string.format("%02d", fileid) + "_download.jpg";

the issue have seen users unable download files (and of course leave 1 start ratings :( ). when check server log see download requests came file names file_??_download.jpg. looks string.format() has returned ?? instead of 2 digit number.

i searched everywhere , not find solution this. can tell me what's wrong code? not re-produce error on of devices.

thanks!

you have instead:

final string filename = "file_" + string.format("%d", fileid) + "_download.jpg";

or

final string filename = "file_" + fileid + "_download.jpg";

if want 2 last digits, it:

int formattedfileid = fileid % 100; final string filename = "file_" + (formattedfileid < 10 ? '0' : '') + string.format("%d", formattedfileid) + "_download.jpg";

or

int formattedfileid = fileid % 100; final string filename = "file_" + (formattedfileid < 10 ? '0' : '') + formattedfileid + "_download.jpg";

-

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