Could not find class 'org.ksoap2.serialization.SoapObject'

When you are running an Android app which uses the ksoap2 as external library some times you may face this unfortunately stopped error.

To solve this problem what you need to do is
Right click on your project select Properties >> Java Build Path and click Order and Export tab tick the check box before to the ksoap2 imported jar and click OK.

Then the error should be solved. :)
If you are still having the same problem clean the project and delete previously installed app from emulator or device and reinstall.

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Android soap web service access using ksoap2 (Handlers)

Here I use Android Handlers to perform the background task.
To access SOAP based web service from Android we can easily use ksoap2 library. It is a lightweight and efficient SOAP client library specially designed for the Android platform. (http://code.google.com/p/ksoap2-android/). in this post I'm going to show how we can access a SOAP web service from Android.

This post consists two parts. In the first part I'm accessing free live .NET web service Currency Converter provided by http://www.webservicex.net/. In the second part I'm going to create a soap call for a java web service hosted in my own PC.

1. Access .NET web service.
Quick demo :

Code for the main activity :
Add ksoap2 to the java build path of your Android project (You can download latest version of ksoap2 from here : http://code.google.com/p/ksoap2-android/wiki/HowToUse?tm=2 click the url under "with a direct download url of ")

package com.axel.androidsoap;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {

   private final String NAMESPACE = "http://www.webserviceX.NET/";
   private final String URL = "http://www.webservicex.net/CurrencyConvertor.asmx";
   private final String SOAP_ACTION = "http://www.webserviceX.NET/ConversionRate";
   private final String METHOD_NAME = "ConversionRate";
   
   private String webResponse = "";
   private TextView textView;
   private Thread thread;
   private Handler handler = new Handler();
   
   private String fromCurrency = "USD";
   private String toCurrency = "LKR";
   
    /** Called when the activity is first created. */
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  textView = (TextView) findViewById(R.id.textView1);
  startWebAccess();
 }
 
 
 public void startWebAccess(){
  thread = new Thread(){
   public void run(){
    try{
      SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); 
         PropertyInfo fromProp =new PropertyInfo();
         fromProp.setName("FromCurrency");
         fromProp.setValue(fromCurrency);
         fromProp.setType(String.class);
         request.addProperty(fromProp);
              
         PropertyInfo toProp =new PropertyInfo();
         toProp.setName("ToCurrency");
         toProp.setValue(toCurrency);
         toProp.setType(String.class);
         request.addProperty(toProp);
             
         SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
         envelope.dotNet = true;
         envelope.setOutputSoapObject(request);
         HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
            
         androidHttpTransport.call(SOAP_ACTION, envelope);
         SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
         webResponse = response.toString();
    }
    
    catch(Exception e){
     e.printStackTrace();
    }
    
    handler.post(createUI);
   }
  };
  
  thread.start();
 }
 
 
 final Runnable createUI = new Runnable() {

  public void run(){

  textView.setText("1 "+fromCurrency+" = "+webResponse+" "+toCurrency);
  }
  };


 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

}

Add internet permission to AndroidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.axel.androidsoap"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.axel.androidsoap.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Code for the activity_main.xml

<RelativeLayout 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=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="32dp"
        android:layout_marginTop="60dp"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

2. Access java web service
We have to create two project for this. One is for the web service and the other one is the Android project. For these two projects keep separate two Eclipse installations.

2.1. Web service project.
Here I have accessed a locally hosted java web service on my PC. If you want to know how to create a java soap web service refer following two posts. (do not need to create the java client described in the 3rd post)

1. http://codeoncloud.blogspot.com/2012/12/create-java-web-service-in-eclipse.html
2. http://codeoncloud.blogspot.com/2012/12/create-java-web-service-in-eclipse_8.html

Here only thing that you need to change is "sayHello" method in the second post.

 public String sayHello(String name) {
    return "Hello !!! " + name;
 }

Replace it with following code

public String sayHello(){
    return "Hello Jelly Bean";
 }

2.2.Android project

  Quick demo :

Code for the main activity :
Add ksoap2 to the java build path of your Android project (You can download latest version of ksoap2 from here : http://code.google.com/p/ksoap2-android/wiki/HowToUse?tm=2 click the url under "with a direct download url of ")

package com.axis.soapaccess;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 //change following variables according to the WSDL
 private final String NAMESPACE = "http://hellodroid.axel.com";
 private final String URL = "http://10.0.2.2:8080/HelloAndroid/services/HelloDroid?wsdl";
 private final String SOAP_ACTION = "http://hellodroid.axel.com/sayHello";
 private final String METHOD_NAME = "sayHello";
 
 private String Webresponse = "";
 private TextView textView;
 private Thread thread;
 private Handler handler = new Handler();

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  textView = (TextView) findViewById(R.id.textView1);
  webAccess();
 }
 
 
 public void webAccess(){
  thread = new Thread(){
   public void run(){
    try{
      SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); 
         SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
         //envelope.dotNet = true;
         envelope.setOutputSoapObject(request);
         HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
         androidHttpTransport.call(SOAP_ACTION, envelope);
            SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
            Webresponse = response.toString();
    }
    
    catch(Exception e){
     e.printStackTrace();
    }
    
    handler.post(createUI);
   }
  };
  
  thread.start();
 }
 
 
 final Runnable createUI = new Runnable() {
  public void run(){
  textView.setText(Webresponse);
 }
 };
  
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

}

Change following variables according to your WSDL.

private final String NAMESPACE = "http://hellodroid.axel.com";
private final String URL = "http://10.0.2.2:8080/HelloAndroid/services/HelloDroid?wsdl";
private final String SOAP_ACTION = "http://hellodroid.axel.com/sayHello";
private final String METHOD_NAME = "sayHello";

First open the WDL using a web browser (How to open the WSDL)

NAMESPACE "targetNamespace"

URL is the URL of WSDL . (replace localhost with ip 10.0.2.2)

SOAP_ACTION  "NAMESPACE/METHOD_NAME"

METHOD_NAME "WSDL operation"

Add internet permission for the Manifest file. Code of the Manifest.xml after adding permissions should like follows.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.axis.soapaccess"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="17"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.axis.soapaccess.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Code for the layout

<RelativeLayout 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=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="113dp"
        android:text="Medium Text"
        android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>

That's it.

If you are getting "Unfortunately stopped" error this post may helpful.

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