Sorry for the ambiguous title but I'm doing the following to write a simple string to a file:

try {
        File root = Environment.getExternalStorageDirectory();
        if (root.canWrite()){
            System.out.println("Can write.");
            File def_file = new File(root, "default.txt");
            FileWriter fw = new FileWriter(def_file);
            BufferedWriter out = new BufferedWriter(fw);
            String defbuf = "default";
            out.write(defbuf);
            out.flush();
            out.close();
        }
        else
            System.out.println("Can't write.");
}catch (IOException e) {
        e.printStackTrace();
}

But root.canWrite() seems to be returning false everytime. I am not running this off of an emulator, I have my android Eris plugged into my computer via USB and running the app off of my phone via Eclipse. Is there a way of giving my app permission so this doesn't happen?

Also, this code seems to be create the file default.txt but what if it already exists, will it ignore the creation and just open it to write or do I have to catch something like FileAlreadyExists(if such an exception exists) which then just opens it and writes?

Thanks for any help guys.