How to read xml from url using xmlpullparser

I was trying this code to read xml file from my assets folder in my app and it works perfectly :

try {
            Log.i("MyActivity","creating parser");
            pullParserFactory = XmlPullParserFactory.newInstance();
            pullParserFactory.setNamespaceAware(true);
            XmlPullParser parser = pullParserFactory.newPullParser();

                InputStream in_s = getApplicationContext().getAssets().open("temp.xml");
                parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
                parser.setInput(in_s, null);

                parseXML(parser);

        } catch (XmlPullParserException e) {
            Log.i("MyActivity","creation failed");
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

I want now to read a file over internet (from url) I make some edit on my code to read from url and it becomes like this :

try {
            Log.i("MyActivity","creating parser");
            pullParserFactory = XmlPullParserFactory.newInstance();
            pullParserFactory.setNamespaceAware(true);
            XmlPullParser parser = pullParserFactory.newPullParser();

                String Url = "http://ift.tt/1D3WgRw";
                InputStream in_s = new URL(Url).openConnection().getInputStream();
                parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
                parser.setInput(in_s, null);

                parseXML(parser);

        } catch (XmlPullParserException e) {
            Log.i("MyActivity","creation failed");
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

But it seems that there is something wrong in this new code because it does not read any thing from this url . Is this way the right way to read from a url using xmlpulparser? or I should do it another way?