android using apache poi to create .xls file -

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i'm using apache poi in android create .xls file, using linux pc(incase matters). following tutorial http://www.youtube.com/watch?v=m2zzl8tk-wg&list=plql5cpdt7hjp3qp4dowlc6wguljfxldia&index=2 copied code exactly, when part when hits refresh , creates .xls file, mine not create it. when hit refresh button seems refreshes, nothing happens, no errors, no file being created. besides in folder shows in, tried looking in every other folder see if created somewhere else whatever reason, not finding anything. doing wrong? never mentions in video changing in manifest storage, figured thats possibility. ideas appreciated thanks.


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