Android web service access using Async Task

Code for the main activity:

In line 68 I have set "envelope.dotNet = true;" because I'm accessing .NET web service. You can comment that line if you are accessing other web service.

package com.soap.client;

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.AsyncTask;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

 private TextView textView;

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_main);

  textView = (TextView) findViewById(R.id.textView1);

  this.accessWebService(textView);

 }

 @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;

 }

 //starting asynchronus task

 private class SoapAccessTask extends AsyncTask {

     @Override

     protected void onPreExecute() {

          //if you want, start progress dialog here

     }

     @Override

     protected String doInBackground(String... urls) {

         String webResponse = "";

        try{

          final String NAMESPACE = "http://www.webserviceX.NET/";

          final String URL = "http://www.webservicex.net/CurrencyConvertor.asmx";

          final String SOAP_ACTION = "http://www.webserviceX.NET/ConversionRate";

          final String METHOD_NAME = "ConversionRate";

          SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); 

          PropertyInfo fromProp =new PropertyInfo();

          fromProp.setName("FromCurrency");

          //gets the first element from urls array

          fromProp.setValue(urls[0]);

          fromProp.setType(String.class);

          request.addProperty(fromProp);

          PropertyInfo toProp =new PropertyInfo();

          toProp.setName("ToCurrency");

          //second element of the urls array

          toProp.setValue(urls[1]);

          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){

          Toast.makeText(getApplicationContext(),"Cannot access the web service"+e.toString(), Toast.LENGTH_LONG).show(); 

        }

         return webResponse;

    }

    @Override

    protected void onPostExecute(String result) {

            //if you started progress dialog dismiss it here

            textView.setText(result);

            Toast.makeText(getApplicationContext(),"Completed...", Toast.LENGTH_LONG).show();

         }

     }

   public void accessWebService(View view) {

   SoapAccessTask task = new SoapAccessTask();

      //passes values for the urls string array 

      task.execute(new String[] { "USD","LKR"});

     }  

}

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="89dp"

        android:text=""

        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

You have to add INTERNET permission to AndroidManifest.xml

xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.soap.client"

    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.soap.client.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>

Download Android (4.2.2) project here.
To find more details about Async Task follow the links below
http://developer.android.com/reference/android/os/AsyncTask.html
http://www.vogella.com/articles/AndroidBackgroundProcessing/article.html

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

If you want to use handlers to access web services refer below tutorial.

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Android web service access using Async Task

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