This is not how things work in Android. To call another installed application, you'll have to do it with an Intent. Android will then select the application(s) best suited for what you're trying to do, and use them to open the file you need. In your example, the code would be something like this :

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(path, "application/pdf");
startActivity(Intent.createChooser(intent, "Open PDF"));


Look at the Intent javadoc to have more explanations about that (the createChooser part is here to allow the user to choose between various apps if more than one can open the designated file)

How to get the path of android installed application
I'm using the pen tool in CS5 to draw shapes, and I'm getting more comfortable with it, but one thing I'd really like to be able to do is add to a path.  For example, if I draw a circle, I'd like to be able to bisect it with the pen tool and have two distinct paths emerge without having to draw two separate paths and try to get the duplicate points on top of each other by hand.

How do I do this?
