How to create subfolder inside app directory (not root) on android device with cordova -

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i have created subfolders in app folder in root (which not visible), want create subfolders visible app directory (that folder can see when enter in file explorer). have donde following in on device ready event:

 window.requestfilesystem(localfilesystem.persistent, 0, create_subfolder, function(){alert('error');});

the create_subfolder function is:

 function create_subfolder(filesystem) { var entry = filesystem.root; //is possible specify here location? entry.getdirectory(     "audios",     {create: true, exclusive: false},     function(){},     function(){alert('error');} );

}


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