Android API - listfolder returns nothing

I have to admit here that I'm both new to Android and new to the DropBox API (but not new to development) so maybe I'm doing something wrong but I cannot get listFolder to return any files no matter what I try.

My code is below and the loop that gets the files is taken from the example API code. There is no issue conencting with the API but no matter what path I put in I either get nothing (if I use "") or an exception if use any other path.

One other thing I'm also confused about - once I've set up an app in the DropBox dashboard (say it's called MyTestApp) do I then need to create a folder of the same name in the root of my DropBox folder?  If not, where is the folder for the app to be found?  I am assuming using "" as the path is the same as saying DropBox/MyTestApp.  I have 5 files of mixed type in this folder but the code never returns anything.... can anyone help me out to get this working?

public class MainActivity extends AppCompatActivity {

    private List<TestClass> filesList;

    final static private String APP_KEY = "yyyyyyyyyyyy";
    final static private String ACCESS_TOKEN = "xxxxxxxxxxx";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //I KNOW THIS IS NOT GOOD CODE BUT I JUST WANT TO GET THE listFolder WORKING
        //BEFORE MAKING A SEPERATE FUNCTION FOR THIS.
        StrictMode.ThreadPolicy policy = new
        StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        DropboxClientFactory dbFactory = new DropboxClientFactory(ACCESS_TOKEN);
        DbxClientV2 client = dbFactory.getClient();

        //TestClass is just a simlpe class with an integer and a string
        filesList =  new ArrayList<TestClass>();

        try {
            ListFolderResult result = client.files().listFolder("");
            while (true) {
                for (Metadata metadata : result.getEntries()) {
                    System.out.println(metadata.getPathLower());   //Never prints anything
                    filesList.add(new TestClass(metadata.getPathLower()));
                }

                if (!result.getHasMore()) {
                    break;
                }

                result = client.files().listFolderContinue(result.getCursor());
            }
        }
        catch (DbxException ex)
        {
            System.out.println("EXCEPTION getting DropBox Files list: " + ex.getMessage());
        }
     }
}