How to combine, create tags and place an ascending order in feeds of more RSS feeds, for example, on Yahoo Pipes?

Question

I need to take feeds over RSS Feed URLs that I need to fill out and show the news in descending order.

Some links do not have an xml tag for <category> , so I need to create it: I need to know where the feeds come from so that I can classify them.

This is what I'm trying to achieve: (for Source n, I mean the category)

[! [enter image description here] [1]] [1]

I used Yahoo!Pipes to make all of these changes.

My attempt was to create a CustomListView for each URL, and then run AsyncTasks all at the same time, but this does not work correctly - the channels are not displayed in ascending order.

Mainactivity

 public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener { private RSSFeed myRssFeed = null; String[] urlFeed = {"url1", "url2"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); for (int i = 0; i < urlFeed.length; i++) { News news = new News(i); news.execute(); } } @Override public void onRefresh() { for (int i = 0; i < urlFeed.length; i++) { News news = new News(i); news.execute(); } } private class News extends AsyncTask<Object, Void, Void> { protected int number; public News(int urlNumber) { number = urlNumber; } @Override protected Void doInBackground(Object... arg0) { String data = ""; InputStream iStream; try{ URL url = new URL(urlFeed[number]); // Creating an http connection to communicate with url HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); // Connecting to url urlConnection.connect(); // Reading data from url iStream = urlConnection.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(iStream)); StringBuilder sbf = new StringBuilder(); String line; while( ( line = br.readLine()) != null){ sbf.append(line); } data = sbf.toString(); br.close(); SAXParserFactory mySAXParserFactory = SAXParserFactory.newInstance(); SAXParser mySAXParser = mySAXParserFactory.newSAXParser(); XMLReader myXMLReader = mySAXParser.getXMLReader(); RSSHandler myRSSHandler = new RSSHandler(); myXMLReader.setContentHandler(myRSSHandler); InputSource myInputSource = new InputSource(url.openStream()); myXMLReader.parse(myInputSource); myRssFeed = myRSSHandler.getFeed(); } catch (ParserConfigurationException | IOException | SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void result) { super.onPostExecute(result); if (myRssFeed != null) { NestedListView list = (NestedListView)findViewById(android.R.id.list); list.setVisibility(View.VISIBLE); CustomList adapter = new CustomList(MainActivity.this, myRssFeed.getList()); adapter.addAll(); list.setAdapter(adapter); } else Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_LONG).show(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main, menu); return true; } } 

Rssfeed

 public class RSSFeed { private String title = null; private String description = null; private String link = null; private String pubdate = null; private String image = null; private String enclosure = null; private String author = null; private List<RSSItem> itemList; RSSFeed(){ itemList = new Vector<RSSItem>(0); } void addItem(RSSItem item){ itemList.add(item); } RSSItem getItem(int location){ return itemList.get(location); } List<RSSItem> getList(){ return itemList; } } 

RSSItem

 public class RSSItem { private String title = null; private String description = null; private String link = null; private String pubdate = null; private String image = null; private String enclosure = null; private String author = null; } 

Customlist

 public class CustomList extends ArrayAdapter<RSSItem> { private static Activity context = null; private final List<RSSItem> web; public CustomList(Activity context, List<RSSItem> web) { super(context, R.layout.new_listview, web); CustomList.context = context; this.web = web; } @SuppressLint("SetTextI18n") @Override public View getView(final int position, View view, ViewGroup parent) { LayoutInflater inflater = context.getLayoutInflater(); @SuppressLint({"ViewHolder", "InflateParams"}) final View rowView = inflater.inflate(R.layout.new_listview, null, true); ImageView imageView = (ImageView)rowView.findViewById(R.id.image); Picasso.with(context).load(web.get(position).getImage()).into(imageView); TextView textView = (TextView)rowView.findViewById(R.id.title); textView.setText(Html.fromHtml(web.get(position).getTitle())); TextView textView1 = (TextView)rowView.findViewById(R.id.description); textView1.setText(web.get(position).getDescription()); TextView textView2 = (TextView)rowView.findViewById(R.id.pubdate); textView2.setText(pubdate); return rowView; } } 

RSShandler

 public class RSSHandler extends DefaultHandler { final int state_unknown = 0; final int state_title = 1; final int state_description = 2; final int state_link = 3; final int state_pubdate = 4; final int state_enclosure = 6; final int state_image = 5; final int state_author = 7; int currentState = state_unknown; String url; RSSFeed feed; RSSItem item; boolean itemFound = false; RSSHandler(){ } RSSFeed getFeed(){ return feed; } @Override public void startDocument() throws SAXException { // TODO Auto-generated method stub feed = new RSSFeed(); item = new RSSItem(); } @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { // TODO Auto-generated method stub if (localName.equalsIgnoreCase("item")){ itemFound = true; item = new RSSItem(); currentState = state_unknown; } else if (localName.equals("enclosure")) { url = attributes.getValue("url"); currentState = state_image; } else if (localName.equalsIgnoreCase("title")){ currentState = state_title; } else if (localName.equalsIgnoreCase("description")){ currentState = state_description; } else if (localName.equalsIgnoreCase("link")){ currentState = state_link; } else if (localName.equalsIgnoreCase("pubdate")){ currentState = state_pubdate; } else if (localName.equalsIgnoreCase("author")){ currentState = state_author; } else{ currentState = state_unknown; } } @Override public void endElement(String uri, String localName, String qName) throws SAXException { // TODO Auto-generated method stub if (localName.equalsIgnoreCase("item")){ feed.addItem(item); } } @Override public void characters(char[] ch, int start, int length) throws SAXException { // TODO Auto-generated method stub String strCharacters = new String(ch,start,length); if (itemFound){ // "item" tag found, it item parameter switch(currentState){ case state_enclosure: item.setEnclosure(strCharacters); break; case state_title: item.setTitle(strCharacters); break; case state_image: item.setImage(url); break; case state_description: item.setDescription(strCharacters); break; case state_link: item.setLink(strCharacters); break; case state_pubdate: item.setPubdate(strCharacters); break; case state_author: item.setAuthor(strCharacters); break; default: break; } } else{ // not "item" tag found, it feed parameter switch(currentState){ case state_enclosure: feed.setEnclosure(strCharacters); break; case state_title: feed.setTitle(strCharacters); break; case state_image: feed.setImage(url); break; case state_description: feed.setDescription(strCharacters); break; case state_link: feed.setLink(strCharacters); break; case state_pubdate: feed.setPubdate(strCharacters); break; case state_author: feed.setAuthor(strCharacters); break; default: break; } } currentState = state_unknown; } 

Answer 1

A solution requires more than one change. The first thing you need to do is complete each news task by adding its data to one big list. This list can then be sorted, which requires Comparator .

You also need a list of names that will appear in the placeholder that you named Source n in your image, and finally, so you can compare them, you need to parse the dates as actual dates.

 public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener { private List<RSSItem> totalRssFeed = new ArrayList<>(); String[] urlFeed = {"MyURL", "MyUrl2", "MyUrl3"}; String[] names = {"Name", "Name2", "Name3"} private CustomList adapter; @Override public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) { super.onCreate(savedInstanceState, persistentState); ListView list = (ListView) findViewById(android.R.id.list); adapter = new CustomList(MainActivity.this); list.setAdapter( adapter ); } @Override protected void onResume() { // do this here and you dont need to repeat it in refresh and create for (int i = 0; i < urlFeed.length; i++) { News news = new News(i); news.execute(); } } public class CustomList extends ArrayAdapter<RSSItem> { ... public CustomList(Activity context) { //dont start with default data super(context, R.layout.new_listview, null); } ... } private class News extends AsyncTask<Object, Void, Void> { protected int number; public News(int urlNumber) { number = urlNumber; } @Override protected Void doInBackground(Object... arg0) { try { //no need to do the input stuff you were doing before here? URL url = new URL(urlFeed[number]); SAXParserFactory mySAXParserFactory = SAXParserFactory.newInstance(); SAXParser mySAXParser = mySAXParserFactory.newSAXParser(); XMLReader myXMLReader = mySAXParser.getXMLReader(); RSSHandler myRSSHandler = new RSSHandler(names[number]); myXMLReader.setContentHandler(myRSSHandler); InputSource myInputSource = new InputSource(url.openStream()); myXMLReader.parse(myInputSource); totalRssFeed.addAll(myRSSHandler.getFeed()); Collections.sort(totalRssFeed); } catch (ParserConfigurationException | IOException | SAXException e) { /* stuff */ } return null; } @Override protected void onPostExecute(Void result) { super.onPostExecute(result); adapter.clear(); adapter.addAll(totalRssFeed); } } public class RSSItem implements Comparable<RSSItem> { public String tag; public Date pubdate; //just public so i didnt need setters in this example public RSSItem(String defaultTagToUse) { //You should set the default to whatever you want displayed //when the tag for <category> is missing, and just update it normally otherwise tag = defaultTagToUse; } void setPubDate(Date date) { pubdate = date; } ... @Override public int compareTo(@NonNull RSSItem another) { int res; if (pubdate == null) { if (another.pubdate == null) { res = 0; } else { res = -1; } } else { if (another.pubdate == null || pubdate.getTime() > another.pubdate.getTime()) { res = 1; } else { res = -1; } } return res; } } public class RSSHandler extends DefaultHandler { ... List<RSSItem> feed; RSSItem item; String mName; public RssHandler(String name) { mName = name; } List<RSSItem> getFeed() { return feed; } @Override public void startDocument() throws SAXException { feed = new ArrayList<>(); } @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { if (localName.equalsIgnoreCase("item")) { itemFound = true; item = new RSSItem( name ); currentState = state_unknown; } else ... } @Override public void endElement(String uri, String localName, String qName) throws SAXException { if (localName.equalsIgnoreCase("item")) { feed.add(item); } } @Override public void characters(char[] ch, int start, int length) throws SAXException { ... case state_pubdate: SimpleDateFormat formatter = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z"); //make sure you match the format from your XML item.setPubdate( formatter.parse(stringCharacters) ); break; ... } } } 

Everything ... jsut means to leave everything that was in these places