Part 1 : Calling a webservice from Android Application

Calling a webservice from Android app

There are two parts

Part 1: Creating a WSDL Service.

Part 2: Calling A WEB SERVICE from Android App.

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Part 1: Creating a webservice

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• Prerequisite: Eclipse which supports web development.
• Download Axis2-1.4 from http://ws.apache.org/axis2/download/1_4/download.cgi
• Download the zip version of “Standard Binary Distribution”.
• Extract in the desired folder and keep a note of its location.
• Open Eclipse. Go to Window -> Preference and you will get the following screen

• Click on “Web Services -> Axis2 Preferences”
• Browse the directory to the location, where we have extracted The “axis2-1.4”
• We should get the following screen “Axis2 runtime loaded sucessfully”.

• Click “OK”
• Create a new “Dynamic Web Project”

• Make sure Server is configured Properly.
• Click Finish.
• Create a new package. Right Click on “src -> New -> Package “

• Click Finish.
• Create a new Java class inside the same Package.

• Click Finish.
• package org.web.backend.calculator;
• Create class “Calculate” inside the package, with following methods.
  public class Calculate {
public int sum(int i, int j) {
return (i + j);
}public int subtract(int i, int j) {
  return (i – j);
  }public int multiply(int i, int j) {
  return (i * j);
  }

  public int divide(int i, int j) {
  return (i / j);
  }
  }

• Save the file.
• When services are deployed to Axis, the wsdd file is used during the deployment and its contents end up within server-config.wsdd in /usr/local/OMII/jakarta-tomcat-5.0.25/webapps/axis/WEB-INF.
• Since we dont have such file, we have to create a “server-config.wsdd”
• Right Click on “WEB-INF” and select “New -> File”. Name it as “server-config.wsdd”.
• The contents can copy pasted from this link
• Make sure you have the following jar files inside the library of created Project.

1. activation.jar
2. commons-discovery.jar
3. jaxrpc.jar
4. mail.jar
5. saaj.jar

• These jar files are required for successful completeion of creation of WSDL service. So if you dont have kindly download it inside the lib folder of axis2-1.4, as shown below.

er

• So now we to copy paste all the library from bin folder inside the lib of project
• From : C:\Users\j3 d patel\jars\Axis2\axis2-1.4\lib
• To : WEB-INF\lib
• Now Project Explorer looks like the following screen shot

• Right Click the Java Class we created “Calculate.java”.
• New -> WebService.

• Click Next
• Click on Web Service runtime : Apache Axis
• Select Apache Axis 2 and click OK. Finally it should look like the foloowing screen shot.

• Select Next.

• Select Next and then click “Start Server.”
• Click “Next”

• Click Finish.
• Right click on Project. Select Run As -> Run on Server
  
• If you get the following error “HTTP Status 404 – /AndroidBackend/”……its fine. dont worry about it.
• Change the url to “http://localhost:8080/AndroidBackend/axis2-web/index.jsp”.

• If you get the following screen, everything is working fine.
• Click on Services.

• If you get the above screen, we have sucessfully created a wsdl file. The only step Remaining is to click on “Calculate”.
• If it points to “http://localhost:8080/AndroidBackend/services/Calculate?wsdl” with a wsdl file in your web browser, We have successfully created a wsdl file for our android app.
• Keep a note of this wsdl url as it will be required in Part 2.

Go to : Part 2         : For calling webservice from ANDROID

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For calling webservice from Flex application

<fx:Declarations>
<!– Place non-visual elements (e.g., services, value objects) here –>
<s:WebService id=”calculatorService”
wsdl=”http://localhost:8080/AndroidBackend/services/Calculate?wsdl&#8221;
result=”calculatorService_resultHandler(event)”
fault=”calculatorService_faultHandler(event)”/>

</fx:Declarations>
<s:Panel x=”75″ y=”87″ width=”312″ height=”260″ title=”Calculator”>
<s:Button id=”add” x=”15″ y=”163″ width=”53″ label=”+”
click=”calculatorService.sum(Number(number1.text),Number(number2.text));”/>

<s:Button id=”divide” x=”211″ y=”163″ width=”53″ label=”/”
click=”calculatorService.divide(Number(number1.text),Number(number2.text));”/>

<s:Button id=”multiply” x=”148″ y=”163″ width=”53″ label=”*”
click=”calculatorService.multiply(Number(number1.text),Number(number2.text));”/>

<s:Button id=”subtract” x=”81″ y=”163″ width=”53″ label=”-”
click=”calculatorService.subtract(Number(number1.text),Number(number2.text));”/>