OK so you can see the file in a dir /courier/saved/. Anyway here's my answer
String filename = "pictures.data";
String root = Environment.getExternalStorageDirectory().toString();
File dir = new File(root + "/courier/saved/");
File file = new File(dir,filename);
file.mkdirs();
if (file.exists())
// program now stops here
else{
}
Best would be to create the dir beforehand maybe, But this creates it on the fly