Session2-J2ME development-environment

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Mobile Information Device Profile (MIDP) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Building J2ME Apps- Tool ,[object Object],[object Object]

J2ME Wireless Toolkit Demo ,[object Object],[object Object],[object Object]

J2ME Wireless Toolkit Demo ,[object Object]

MIDlet Programming ,[object Object],[object Object],[object Object]

MIDlet Transition States ,[object Object],Why do we need a Paused state?

Midlet Skeleton import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class MyApp extends MIDlet { public void startApp() { // start up code } public void pauseApp() { // we aren't showing any more } public void destroyApp(boolean unconditional) { // clean up } } Note that startApp(), pauseApp() and destroyApp() are abstract methods. Midlet program must override these 3 methods even if not used.

Two Level API ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Displaying Objects ,[object Object],[object Object],[object Object],[object Object],[object Object]

First Example - HelloWorld ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Building the MIDlet ,[object Object],[object Object],[object Object]

Building the MIDlet ,[object Object]

Building and Run the MIDlet ,[object Object]

How can the program exit? ,[object Object],[object Object],[object Object]

Event Handling with Command s ,[object Object],[object Object],[object Object],[object Object],[object Object]

Command O bjects ,[object Object],soft-buttons

Command O bjects ,[object Object]

Use Command objects ,[object Object],[object Object],[object Object],[object Object],[object Object]

Create a Command ,[object Object],[object Object],Command Meaning BACK returns to the previous screen. CANCEL standard negative answer to a dialog EXIT for exiting from the application. HELP a request for on-line help. ITEM specific to the items of the Screen or the elements of a Choice. OK standard positive answer to a dialog SCREEN an application-defined command STOP A command that will stop some currently running process, operation, etc.

Create a Command ,[object Object],[object Object],[object Object],[object Object],[object Object],label type priority

P riority and Long Label ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Responding to Commands ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Abstract method of CommandListener. Will be called when any command in the Form is selected.

Another Command Example (Two Forms) Launch Exit Exit 2nd Form Go to First Form

Another Command Example (Two Forms) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Another Command Example (Two Forms) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Another Command Example (Two Forms) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Simple Debugging ,[object Object],[object Object],public void pauseApp() { } public void destroyApp(boolean unconditional) { } public void commandAction(Command c, Displayable d) { if (c==exitCommand) notifyDestroyed(); else if (c==firstFormCommand) { Display.getDisplay(this).setCurrent( f1 ); System.out.println(“1st Form is called"); } else { System.out.println("2nd Form is called"); Display.getDisplay(this).setCurrent( f2 ); } } }

Session2-J2ME development-environment

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