private void getDemoDirectory(final DemoCallback callback) {
getDemoDirectory("gwtmobile-phonegap", callback);
}
private void getDemoDirectory(final String dirName, final DemoCallback callback) {
FileMgr.requestFileSystem(LocalFileSystem.PERSISTENT, new FileSystemCallback() {
@Override
public void onSuccess(FileSystem fs) {
fs.getRoot().getDirectory(dirName, new FileOptions().create(true), new EntryCallback() {
@Override
public void onSuccess(Entry entry) {