Use XML over JSON when any of these is true:
- You need message validation
- You're using XSLT
- Your messages include a lot of marked-up text
- You need to interoperate with environments that don't support JSON
<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/">
<channel>
<title>Latest News from Science Magazine</title>
<link>http://www.sciencemag.org/rss/news_current.xml</link>
<description>Editable in modal at Format : RSS Feed | Settings : RSS Description</description>
<pubDate>Wed, 11 Oct 2017 05:51:21 -0400</pubDate>
<item>
<title><![CDATA[The big city is safer than the country, at least if you’re a goose]]></title>
<link>http://www.sciencemag.org/news/2017/10/big-city-safer-country-least-if-you-re-goose</link>
<pubDate>Wed, 11 Oct 2017 12:00:00 -0400</pubDate>
<guid isPermaLink="true">http://www.sciencemag.org/news/2017/10/big-city-safer-country-least-if-you-re-goose?rss=1</guid>
<description><![CDATA[City birds are twice as likely to survive the winter than their country cousins]]></description>
<media:credit role="author"><![CDATA[Lakshmi Supriya]]></media:credit>
<media:category><![CDATA[Biology, Climate, Plants & Animals]]></media:category>
<media:content url="http://www.sciencemag.org/sites/default/files/styles/article_main_teaser/public/cc_C31FJ4_16x9.jpg?itok=ZBt2Ej2a" height="266" width="127" />
<media:thumbnail url="http://www.sciencemag.org/sites/default/files/styles/article_main_teaser/public/cc_C31FJ4_16x9.jpg?itok=ZBt2Ej2a" height="266" width="127" />
</item>
<item>
<title><![CDATA[Watch the human genome fold itself in four dimensions ]]></title>
<link>http://www.sciencemag.org/news/2017/10/watch-human-genome-fold-itself-four-dimensions</link>
<pubDate>Tue, 10 Oct 2017 09:00:00 -0400</pubDate>
<guid isPermaLink="true">http://www.sciencemag.org/news/2017/10/watch-human-genome-fold-itself-four-dimensions?rss=1</guid>
<description><![CDATA[Loops form and disappear to allow genes to interact]]></description>
<media:credit role="author"><![CDATA[Elizabeth Pennisi]]></media:credit>
<media:category><![CDATA[Biology, Health]]></media:category>
<media:content url="http://www.sciencemag.org/sites/default/files/styles/article_main_teaser/public/4dchromevideo.jpg?itok=Q73Ntn43" height="266" width="127" />
<media:thumbnail url="http://www.sciencemag.org/sites/default/files/styles/article_main_teaser/public/4dchromevideo.jpg?itok=Q73Ntn43" height="266" width="127" />
</item>
</channel>
</rss>
I Get this Output by a News website in XML format, anyone can use their link they have an Open Platform.
Let's Understand the Response
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.targetandroid.info.xmlfeed.MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rv_feed" >
</android.support.v7.widget.RecyclerView>
</LinearLayout>
To Populate data in Recycler view we have to Make a POJO class Name it as FeedItem.java
3. Create a POJO class FeedItem.java and Add Below Code
/**
* Created by Faizan on 09/04/17.
*/
public class FeedItem {
String title;
String link;
String description;
String pubDate;
String thumbnailUrl;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getPubDate() {
return pubDate;
}
public void setPubDate(String pubDate) {
this.pubDate = pubDate;
}
public String getThumbnailUrl() {
return thumbnailUrl;
}
public void setThumbnailUrl(String thumbnailUrl) {
this.thumbnailUrl = thumbnailUrl;
}
}
To Display Data we have to create a custom layout for recylerview so we can decide how every single Item will display on the screen.
So create a layout file, I ready discussed how to create a layout file in the previous tutorial of recyclerview
4. Create a layout file and add below code into that
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:paddingTop="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_title"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_desc"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_pubdate"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_link"
android:textColor="@android:color/holo_blue_dark"
/>
</LinearLayout>
Here we are getting a Link ,in our response, to read the full news. so we have to open that link in Webview so for that we have to create a new Activity which Contains WebView and can open our Link.
I already covered a brief tutorial on Webview you can check it out fromhere.
5. Create a new Activity Name it as WebViewActivity.java and add below xml code in activity_web_view.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.targetandroid.info.xmlfeed.WebViewActivity">
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/wv_url" >
</WebView>
</LinearLayout>
6. Now open WebViewActivity.java and add below code
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class WebViewActivity extends AppCompatActivity {
String webviewurl;
WebView wv_url;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_view);
//here we will get the url passed by previous activity
webviewurl=getIntent().getStringExtra("url");
wv_url=(WebView)findViewById(R.id.wv_url);
wv_url.setWebViewClient(new WebViewClient());
//load the url in Webview
wv_url.loadUrl(webviewurl);
}
}
7. Create an Adapter For RecyclerView name it as MyRVAdapter.java
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
/**
* Created by Faizan on 09/19/17.
*/
public class MyRVAdapter extends RecyclerView.Adapter<MyRVAdapter.MyViewHolder> {
private List<FeedItem> feedItems;
private Context context;
public MyRVAdapter(Context context,List<FeedItem> items){
this.context=context;
this.feedItems = items;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
final View view = inflater.inflate(R.layout.customlayout, parent, false);
MyViewHolder mvh = new MyViewHolder(view, new MyViewHolder.myClickWebView() {
@Override
public void gotoWebView(String textlink) {
Intent intent=new Intent(context,WebViewActivity.class);
//Send the url to webviewActivity
intent.putExtra("url",textlink);
context.startActivity(intent);
}
});
return mvh;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
FeedItem item = feedItems.get(position);
holder.tv_desc.setText(item.getDescription());
holder.tv_link.setText(item.getLink());
holder.tv_pubdate.setText(item.getPubDate());
holder.tv_title.setText(item.getTitle());
//get the link
holder.textlink=item.getLink();
}
@Override
public int getItemCount() {
return feedItems==null?0:feedItems.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder{
TextView tv_title, tv_desc, tv_pubdate, tv_link;
String textlink;
myClickWebView myClickWebView;
public MyViewHolder(View itemView, final myClickWebView myClickWebView) {
super(itemView);
tv_title=(TextView)itemView.findViewById(R.id.tv_title);
tv_desc=(TextView)itemView.findViewById(R.id.tv_desc);
tv_pubdate=(TextView)itemView.findViewById(R.id.tv_pubdate);
tv_link=(TextView)itemView.findViewById(R.id.tv_link);
this.myClickWebView=myClickWebView;
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
myClickWebView.gotoWebView(textlink);
}
});
/* tv_link.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(context,WebViewActivity.class);
}
});*/
}
//interface to handle onclick event and send some extras to another activity
public interface myClickWebView{
void gotoWebView(String textlink);
}
}
}
8. Now finally Come to MainActivity.java and Call the HTTP Request to get the Response and Parse it
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
public class MainActivity extends AppCompatActivity {
ArrayList<FeedItem> feedItems=new ArrayList<>();
RecyclerView rv_test;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rv_test=(RecyclerView) findViewById(R.id.rv_test);
ReadRss readRss=new ReadRss(this);
//call Http request using Async Task
readRss.execute();
}
public class ReadRss extends AsyncTask<Void, Void, Void> {
Context context;
String address = "http://www.sciencemag.org/rss/news_current.xml";
ProgressDialog progressDialog;
URL url;
public ReadRss(Context context) {
this.context = context;
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("Loading...");
}
@Override
protected void onPreExecute() {
progressDialog.show();
super.onPreExecute();
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
progressDialog.dismiss();
}
@Override
protected Void doInBackground(Void... params) {
ProcessXml(Getdata());
//Every View run on Ui Thread and doInBackground runs in Background thread
runOnUiThread(new Runnable() {
@Override
public void run() {
rv_test.setAdapter(new MyRVAdapter(MainActivity.this,feedItems));
rv_test.setLayoutManager(new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false));
}
});
return null;
}
//Parse the XML response and Pass it to Recycler View
private void ProcessXml(Document data) {
if (data != null) {
Element root = data.getDocumentElement();
Node channel = root.getChildNodes().item(1);
NodeList items = channel.getChildNodes();
for (int i = 0; i < items.getLength(); i++) {
Node cureentchild = items.item(i);
if (cureentchild.getNodeName().equalsIgnoreCase("item")) {
FeedItem item=new FeedItem();
NodeList itemchilds = cureentchild.getChildNodes();
for (int j = 0; j < itemchilds.getLength(); j++) {
Node cureent = itemchilds.item(j);
if (cureent.getNodeName().equalsIgnoreCase("title")){
item.setTitle(cureent.getTextContent());
}else if (cureent.getNodeName().equalsIgnoreCase("description")){
item.setDescription(cureent.getTextContent());
}else if (cureent.getNodeName().equalsIgnoreCase("pubDate")){
item.setPubDate(cureent.getTextContent());
}else if (cureent.getNodeName().equalsIgnoreCase("link")){
item.setLink(cureent.getTextContent());
}
}
feedItems.add(item);
Log.d("itemTitle", item.getTitle());
Log.d("itemDescription",item.getDescription());
Log.d("itemPubDate",item.getPubDate());
Log.d("itemLink",item.getLink());
}
}
}
}
//Call the Http GET Request and
//Return the XML response in Document Format
public Document Getdata() {
try {
url = new URL(address);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
InputStream inputStream = connection.getInputStream();
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document xmlDoc = builder.parse(inputStream);
return xmlDoc;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
}
9. Add a Internet Permission into AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET" />10. Now run your Project you will see a below output
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