This document is used to guide for accessing Restful JSON webservice

1. Create New Android Project in Eclipse.
1. Name of Project: - TestJSONWebService
2. Build Target: - Android (2.2)
3. Application Name: - TestWebService
4. Package Name: - parallelminds.webservice.com
5. Create Activity: - TestWebServiceActivity
Now our First Activity is TestWebServiceActivity which as followes.This class is used to make
a call JSON web service. using callWebService() method.
package parallelminds.testservice.com;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class TestServiceActivity extends ListActivity {
LinearLayout objLinearLayout;
TextView tv;

2. int receivedJArrayLength;
private static String url = "http://202.71.142.203:8871/Service.svc/GetProjects";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.setListAdapter(new ArrayAdapter <String>
(this,android.R.layout.simple_list_item_1,this.ParsedJson()));
}
// Method returning array list of JSON web-service
private ArrayList<String> ParsedJson()
{
ArrayList<String> listItems = new ArrayList<String>();
CallWebService objCallWebService = new CallWebService();
JSONArray receivedJArray = objCallWebService.callWebService(url);
receivedJArrayLength = receivedJArray.length();
TextView showmsg = new TextView(this);
showmsg.setText(msg);
objLinearLayout.addView(showmsg);*/
if (receivedJArray != null)
for (int i = 0; i < receivedJArrayLength; i++) {
try {
String displayString = "";
JSONObject jObj = receivedJArray.getJSONObject(i);
displayString += "------------n";
displayString += "Id :" + jObj.getString("Id") + "n";
displayString += "Name :" + jObj.getString("Name") + "n";
displayString += "KickOffNotes:"+jObj.getString("KickOffNotes") + "n";
displayString += "Description :"+ jObj.getString("Description") + "n";
displayString += "MemberCount :" + jObj.getString("MemberCount") + "n";
displayString += "StartDate :"+ jObj.getString("StartDate") + "n";
displayString += "DeliveryDate :"+ jObj.getString("DeliveryDate") + "n";
displayString += "Status :" + jObj.getString("Status")+ "nn";
displayString += "n********";

3. listItems.add(displayString);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return listItems;
}
}
This is our second class CallWebService
package parallelminds.testservice.com;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import android.util.Log;
public class CallWebService {
// This method is used to get JSONArray Object
JSONArray callWebService(String serviceURL) {
JSONArray jArray = null;
// http get client
HttpClient client = new DefaultHttpClient();
HttpGet getRequest = new HttpGet();
try {
// get the requested URI
getRequest.setURI(new URI(serviceURL));
} catch (URISyntaxException e) {
Log.e("URISyntaxException", e.toString());
}
// read the response in the buffer

4. BufferedReader in = null;
// the service response
HttpResponse response = null;
try {
// call the requested url
response = client.execute(getRequest);
} catch (ClientProtocolException e) {
Log.e("ClientProtocolException", e.toString());
} catch (IOException e) {
Log.e("IO exception", e.toString());
}
try {
in = new BufferedReader(new InputStreamReader(response.getEntity()
.getContent()));
} catch (IllegalStateException e) {
Log.e("IllegalStateException", e.toString());
} catch (IOException e) {
Log.e("IO exception", e.toString());
}
StringBuffer buff = new StringBuffer("");
String line = "";
try {
while ((line = in.readLine()) != null) {
buff.append(line);
}
} catch (IOException e) {
Log.e("IO exception", e.toString());
}
try {
in.close();
} catch (IOException e) {
Log.e("IO exception", e.toString());
}
// now we need to parse the response
String result = buff.toString();
try {
jArray = new JSONArray(result);
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
return jArray;
}

5. }
Now our main.xml is as follows.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:id="@+id/MainLayoutPMTS">
<ListView android:id="@id/android:list" android:layout_height="match_parent"
android:layout_width="match_parent" ></ListView>
<TextView android:id="@+id/webXml" android:layout_width="fill_parent"
android:layout_height="fill_parent">
</TextView>
</LinearLayout>