List files in the resourcesDirectory

app.js

var win = Ti.UI.createWindow({ 
	backgroundColor: '#fff',
	layout: 'vertical'
});

var testButton = Ti.UI.createButton({
	title: "list files",
	top: 20,
	height: 50,
	width: 250,
});
testButton.addEventListener('click', function(e){
	var dir = Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory);
	var files = dir.getDirectoryListing();
	Ti.API.info('ALL FILES '+files);

	var qty = files.length;
	i=0;
	while (i < qty)
	{
	  Ti.API.info('ROW '+files[i]);
	   i++; 
	}
});

win.add(testButton);
win.open();