In the previous blog I have shared the json parsing ,now I am sharing the xml parsing.
I have pasted an api having xml format :
<menu>
</menu>
First I have made a class which is used to connect with the server.and I have made another class which is used to check the internet connection
I have made a class named ConnectionDetector.java to check the internet connection:
public class ConnectionDetector {
private Context _context;
public ConnectionDetector(Context context){
this._context = context;
}
public boolean isConnectingToInternet(){
ConnectivityManager connectivity = (ConnectivityManager)_context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null)
{
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
return false;
}
}
Now let's make another class which is used to connect with the server and help to fetch the values of the nodes. I have named it XMLParser.java :
import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import android.util.Log;
public class XMLParser {
// constructor
public XMLParser() {
}
/**
* Getting XML from URL making HTTP request
* @param url string
* */
public String getXmlFromUrl(String url) {
String xml = null;
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
xml = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// return XML
return xml;
}
/**
* Getting XML DOM element
* @param XML string
* */
public Document getDomElement(String xml){
Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xml));
doc = db.parse(is);
} catch (ParserConfigurationException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (SAXException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (IOException e) {
Log.e("Error: ", e.getMessage());
return null;
}
return doc;
}
/** Getting node value
* @param elem element
*/
public final String getElementValue( Node elem ) {
Node child;
if( elem != null){
if (elem.hasChildNodes()){
for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
if( child.getNodeType() == Node.CDATA_SECTION_NODE ||child.getNodeType() == Node.TEXT_NODE ){
return child.getNodeValue();
}
}
}
}
return "";
}
/**
* Getting node value
* @param Element node
* @param key string
* */
public String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
}
Now I have make a layout for showing response in a list, containing a listview ,named :
first.xml :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#FFFFFF">
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
>
</ListView>
</RelativeLayout>
I have made another xml which contains the design for the single row of the listview ,I have named it : row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="30sp"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:textColor="#000000"
android:layout_margin="5sp"/>
</LinearLayout>
Now let's move to the main activity,in which all the main codes and functionality to fetch the responses has been described ,I have named it : XmlParsingActivity.java
import java.util.ArrayList;
import java.util.HashMap;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.Toast;
import com.adapter.FirstAdapter;
import com.json.libs.ConnectionDetector;
import com.json.libs.XMLParser;
public class XmlParsingActivity extends Activity{
ListView list;
ProgressDialog dlg;
ArrayList<HashMap<String,String>> Show = null;
static final String URL = "";// mention the api url of xml format
// XML node keys
public static final String KEY_ITEM = "item"; // parent node
public static final String KEY_ID = "id";
public static final String KEY_NAME = "name";
public static final String KEY_COST = "cost";
public static final String KEY_DESC = "description";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first);
list = (ListView)findViewById(R.id.listView1);
InItAction();
}
private void InItAction() {
ConnectionDetector cd = new ConnectionDetector(getApplicationContext());
if (cd.isConnectingToInternet()) {
new AsyncTaskLoad().execute();
}
else{
Toast.makeText(getApplicationContext(),"Interent not available!",Toast.LENGTH_LONG).show();
}
}
class AsyncTaskLoad extends AsyncTask<String,String,String>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
if (Build.VERSION.SDK_INT >= 11 ) {
dlg = new ProgressDialog(XmlParsingActivity.this,AlertDialog.THEME_HOLO_LIGHT );
} else {
dlg = new ProgressDialog(XmlParsingActivity.this);
}
dlg.setMessage("Loading...");
dlg.show();
}
@Override
protected String doInBackground(String... params) {
Show = new ArrayList<HashMap<String,String>>();
try {
//http://api.androidhive.info/pizza/?format=xml
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_ITEM);
// looping through all item nodes <item>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, parser.getValue(e, KEY_ID));
map.put(KEY_NAME, parser.getValue(e, KEY_NAME));
map.put(KEY_COST, "Rs." + parser.getValue(e, KEY_COST));
map.put(KEY_DESC, parser.getValue(e, KEY_DESC));
// adding HashList to ArrayList
Show.add(map);
}
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
dlg.dismiss();
if (Show.size()==0) {
list.setAdapter(null);
Toast.makeText(getBaseContext(),"no contacts!!",Toast.LENGTH_LONG).show();
}
else
{
FirstAdapter adapter = new FirstAdapter(XmlParsingActivity.this,Show);
list.setAdapter(adapter);
}
}
}
}
Now we have to make an adapter to show all the items in a listview I have named it :
FirstAdapter.java
import java.util.ArrayList;
import java.util.HashMap;
import com.blogdemo.R;
import com.blogdemo.XmlParsingActivity;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class FirstAdapter extends BaseAdapter{
Activity activity;
ArrayList<HashMap<String, String>> Show = new ArrayList<HashMap<String,String>>();
ViewHolder holder ;
public FirstAdapter(Activity mactivity,
ArrayList<HashMap<String, String>> show) {
this.activity = mactivity;
this.Show = show;
}
@Override
public int getCount() {
return Show.size();
}
@Override
public Object getItem(int position) {
return Show.get(position);
}
@Override
public long getItemId(int position) {
return Show.size();
}
private class ViewHolder {
public TextView txt;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mLayoutInflater = LayoutInflater.from(activity);
convertView = mLayoutInflater.inflate(R.layout.row,
null);
holder = new ViewHolder();
holder.txt = (TextView)convertView.findViewById(R.id.textView1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txt.setText("id: "+Show.get(position).get(XmlParsingActivity.KEY_ID)+" \n"
+"Name: "+Show.get(position).get(XmlParsingActivity.KEY_NAME)
+" \n"+"Price:"+Show.get(position).get(XmlParsingActivity.KEY_COST)
+" \n"+"Detail:"+Show.get(position).get(XmlParsingActivity.KEY_DESC));
return convertView;
}
}
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
Screen shot for the response of an api using xml parsing technique
