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Apps file permissions

Hi all ,can any one help me in ,how to hide the files programatically in android ?is there any dirtect api ,like setHidden()?.

and how to set files readonly or writable ?
in both cases, like in sdcard files and the files which are in file system(" /data/data/packagename/ " folder).
and how to find programatically whether the sdcard inserted or not .(how to detect)

all these methods are available in j2me .

thanks in advance ,
murali dhuli
 
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