Senthilkumar Shanmugam

Hello World Program in Mobile Applications
In this article, we will create a Hello World page which gets the name from the user and prints the same with the string “Hello World”
We have to create 3 Java Class for the same. They are

1. CustomTestFunction.java: This Class is for Application level initialization and this class is registered as the Function in AOL. This extends the base class MenuItemBean

2. CustomTestPage.java: This Class is for Page initialization. It just creates the layout and adds the beans to the page. It extends PageBean Class

3. CustomTestFListener.java: This Class is the event listener class. It listens to the events on each bean on the page and calls appropriate method to handle the event.

1) CustomTestFunction.java

/* Function class - this links the page with FND Function in AOL */

package xxx.custom.server;

import oracle.apps.fnd.common.VersionInfo;
import oracle.apps.inv.utilities.server.UtilFns;
import oracle.apps.mwa.beans.MenuItemBean;
import oracle.apps.mwa.eventmodel.MWAAppListener;
import oracle.apps.mwa.eventmodel.MWAEvent;

public class CustomTestFunction extends MenuItemBean implements MWAAppListener

{

public CustomTestFunction()

{

//Link the page with the function

setFirstPageName("xxx.custom.server.CustomTestPage");

addListener(this);

}

public void appEntered(MWAEvent mwaevent)

{

// Code here to initialize Application Level

// Logging Functions

UtilFns.trace("Application Entered");

}

public void appExited(MWAEvent mwaevent)

{

// Code to be executed when the user exits the application

// Logging Functions

UtilFns.trace("Application Exited");

}

public static final String RCS_ID = "$Header:$";

public static final boolean RCS_ID_RECORDED = VersionInfo.recordClassVersion("$Header:$", "%packageheader%");

}

2. CustomTestPage.java

/* Page Class - Which has the Page Layout. We create and add beans to it */

package xxx.custom.server;

import oracle.apps.fnd.common.VersionInfo;

import oracle.apps.inv.utilities.server.UtilFns;

import oracle.apps.mwa.beans.ButtonFieldBean;

import oracle.apps.mwa.beans.PageBean;

import oracle.apps.mwa.beans.TextFieldBean;

import oracle.apps.mwa.eventmodel.AbortHandlerException;

import oracle.apps.mwa.eventmodel.DefaultOnlyHandlerException;

import oracle.apps.mwa.eventmodel.InterruptedHandlerException;

import oracle.apps.mwa.eventmodel.MWAEvent;

import xxx.custom.server.CustomTestFListener;

//Page Listener Class

public class CustomTestPage extends PageBean {

/**

* Default constructor which just initialises the layout.

*/

public CustomTestPage() {

//Method to initialize the layout

initLayout();

}

/**

* Does the initialization of all the fields. Creates new instances

* and calls the method to set the prompts which may have to be later

* moved to the page enter event if we were using AK prompts as we

* require the session for the same.

*/

private void initLayout() {

//Logging

if (UtilFns.isTraceOn)

UtilFns.trace("CustomPage initLayout");

//Create a Text Filed and Set an ID

mHelloWorld = new TextFieldBean();

mHelloWorld.setName("TEST.HELLO");

// Create a Submit Button and set an ID

mSubmit = new ButtonFieldBean();

mSubmit.setName("TEST.SUBMIT");

//add the fields

addFieldBean(mHelloWorld);

addFieldBean(mSubmit);

//add field listener to all necessary fields

CustomTestFListener fieldListener =

new CustomTestFListener();

mHelloWorld.addListener(fieldListener);

mSubmit.addListener(fieldListener);

//call this method to initializa the prompts

this.initPrompts();

}

/**

* Method that sets all the prompts up.

*/

private void initPrompts() {

UtilFns.trace(" Custom Page - Init Prompts");

// sets the page title

this.setPrompt("Test Custom Page");

// set the prompts for all the remaining fields

mHelloWorld.setPrompt("Enter Your Name");

mSubmit.setPrompt("Submit");

//please note that we should not hard code page name and prompts

//as it may cause translation problems

//we have an different procedure to overcome this

}

// This method is called when the user clicks the submit button

public void print(MWAEvent mwaevent, TextFieldBean mTextBean) throws AbortHandlerException

{

UtilFns.trace(" Custom Page - print ");

// Get the value from Text bean and append hello world

// and display it to user on the same field

String s = mTextBean.getValue();

mTextBean.setValue(s+" Hello World");

}

// Method to get handle of TextBean

public TextFieldBean getHelloWorld() {

return mHelloWorld;

}

//Method called when the page is entered

public void pageEntered(MWAEvent e) throws AbortHandlerException,

InterruptedHandlerException,

DefaultOnlyHandlerException {

UtilFns.trace(" Custom Page - pageEntered ");

}

//Method called when the page is exited

public void pageExited(MWAEvent e) throws AbortHandlerException,

InterruptedHandlerException,

DefaultOnlyHandlerException {

UtilFns.trace(" Custom Page - pageExited ");

}

// Create the Bean Variables

TextFieldBean mHelloWorld;

protected ButtonFieldBean mSubmit;

}

3) CustomTestFListener.java

/* Listener Class - Handles all events */

package xxx.custom.server;

import oracle.apps.inv.utilities.server.UtilFns;
import oracle.apps.mwa.beans.FieldBean;
import oracle.apps.mwa.container.Session;
import oracle.apps.mwa.eventmodel.AbortHandlerException;
import oracle.apps.mwa.eventmodel.DefaultOnlyHandlerException;
import oracle.apps.mwa.eventmodel.InterruptedHandlerException;
import oracle.apps.mwa.eventmodel.MWAEvent;
import oracle.apps.mwa.eventmodel.MWAFieldListener;

public class CustomTestFListener implements MWAFieldListener {

public CustomTestFListener() {

}

public void fieldEntered(MWAEvent mwaevent) throws AbortHandlerException,InterruptedHandlerException, DefaultOnlyHandlerException {

UtilFns.trace("Inside Field Entered");

 ses = mwaevent.getSession();

String s = UtilFns.fieldEnterSource(ses);

// Prints the Current Bean's ID

UtilFns.trace("CustomFListener:fieldEntered:fldName = " + s);

}

public void fieldExited(MWAEvent mwaevent) throws AbortHandlerException, InterruptedHandlerException, DefaultOnlyHandlerException {

String s = ((FieldBean)mwaevent.getSource()).getName();

// Prints the Current Bean's ID

UtilFns.trace("CustomFListener:fieldExited:fldName = " + s);

// Get handle to session and page
Session ses = mwaevent.getSession();
pg = (CustomTestPage)ses.getCurrentPage();

// when the user clicks the Submit button call the method to print
// Hello world with the text entered in text box

if (s.equals("TEST.SUBMIT")) {

 pg.print(mwaevent,pg.getHelloWorld());

return;

 }

}

// Varibale declaration
CustomTestPage pg;
Session ses;

}

Screen shots:

Fig 1: Choose the Responsibility in the Mobile Device

Fig 2: Choose the Function from main menu

Fig 3: The Hello World Page appears

Fig 4: Enter your name

Fig 5: When you click submit button, Your name is appended with Hello world and displayed in the Text Box