Delete files in uninstall process

Hi everyone!!

I have downloaded resource files (imgs, videos) to device using standar code:

var f = Titanium.Filesystem.getFile(localFilepath,file); f.write(c.responseData);

where localfilepath = Titanium.Filesystem.applicationDataDirectory;

I have read in documentation:

Ti.Filesystem.applicationDataDirectory: A read/write directory accessible by your app. Place your application-specific files in this directory. The contents of this directory persist until you remove the files or until the user uninstalls the application.

However , when I uninstall app from device I can see app folder with all files inside. What´s the problem?

Thanks in advance!

Titanium SDK : 3.2.3 GA Platform : Android Device : Sony Xperia