CHADALAWADA RAMANAMMA ENGINEERING COLLEGE

Transcription

1 1 MOBILE APPLICATION DEVELOPMENT LABORATORY MANUAL Subject Code : 9F00506 Regulations : JNTUA R09 Class : V Semester (MCA) CHADALAWADA RAMANAMMA ENGINEERING COLLEGE (AUTONOMOUS) Chadalawada Nagar, Renigunta Road, Tirupati Department of Master of computer Applications 1

2 CHADALAWADA RAMANAMMA ENGINEERING COLLEGE (AUTONOMOUS) Chadalawada Nagar, Renigunta Road, Tirupati Department of Master of computer Applications 2 INDEX S. No Name of the Experiment Page No 1 Installation of J2ME Hello World Display Class Command Class Radio Buttons Alert Class Date and Time Text Field Round Rectangle Filled Arc Record Enumeration Sorting RMS Searching RMS Bar Graph & Pie Chart Working on Drawing and images Client Server

3 3 AIM: Installation of J2ME Wireless Toolkit PROCEDURE: Download the J2ME Wireless Toolkit from the Sun web site. The Toolkit file is a self-extracting executable file. Run this executable after downloading the file, and the installation program creates all the directories required to run the Toolkit. 3

4 4 The installed J2MEWirelessToolkit is placed in thewtk104 directory, although the directory might have a variation of this name depending on the version of the Toolkit that you download. press Next Next Install 4

5 5 Now installing the Wireless Toolkit After Complete the Installation press Finish 5

6 6 Then go to start menu->select Sun Java Wireless Toolkit 2.5.2_01 Select Wireless Toolkit under Sun Java Wireless Toolkit 2.5.2_01 6

7 7 We can Create a new project select New Project Option Then select the project from the list Project loads here 7

8 8 Then click on build to compile the project Click Run to see the output in mobile emulator It will display mobile emulator. 8

9 9 HELLO WORLD AIM: To write and implement the J2ME program to Display a Hello world program. 9

10 10 CREATING AN INSTANCE OF THE HELLO WORLD: 1. Declare reference. 2. Obtain a reference to the instance of the Display class. 3. Create an instance of the command class. 4. Create an instance of the command class to exit the MIDlet. 5. Create an instance of the form class. 6. Create an instance of the textbox class that contains the hello world. 7. Associate the instance of the back-command class with the instance of the textbox class. JAR FILE: MIDlet-1 : Hello World, greeting Hello World MIDlet-Name : Hello World MIDlet-Version : 1.0 MIDlet-Vendor : Jim MIDlet-1 : HelloWorld, /greeting/ mylogo.png Micro Edition-Configuration : CLDC-1.0 Micro Edition-Profile : MIDP-1.0 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class HelloWorld extends MIDlet implements CommandListener private Display display ; private TextBoxtextBox ; private Command quitcommand; public void startapp() display = Display.getDisplay(this); quitcommand = new Command("Quit", Command.SCREEN, 1); textbox = new TextBox("Hello World", "My first MIDlet", 40, 0); textbox.addcommand(quitcommand); textbox.setcommandlistener(this); display.setcurrent(textbox ); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command choice, Displayable displayable) if (choice == quitcommand) destroyapp(false); notifydestroyed(); 10

11 11 OUTPUT: DISPLAY CLASS AIM: To write and implement the J2ME program to display check color on screen by using 11

12 12 display class. CREATING AN INSTANCE OF THE COLOR ATTRIBUTE OF A DEVICE: 1. Create references. 2. Create a Display object. 3. Create an instance of the Command class to exit the MIDlet. 4. Call iscolor() method. 5. Evaluate the return value of iscolor() method. 6. Create an instance of the TextBox class that describes results of iscolor() method. 7. Associate the instances of the Command class with the instances of the TextBox class. 8. Associate a Command Listener with the instance of the TextBox class. 9. Display the instance of the TextBox class on the screen. 10. Terminate the MIDlet when the Exit command is entered. JAD FILE: MIDlet-Name : Check Color MIDlet-Version : 1.0 MIDlet-Vendor : My Company MIDlet-Jar-URL : CheckColor.jar MIDlet-1 : Check Color, CheckColor.png, Check Color Micro Edition-Configuration : CLDC-1.0 Micro Edition-Profile : MIDP-1.0 MIDlet-JAR-SIZE : 100 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class CheckColor extends MIDlet implements CommandListener private Display display; private Form form; private TextBox textbox; private Command exit; public CheckColor() display = Display.getDisplay(this); exit = new Command("Exit", Command.SCREEN, 1); String message=null; if (display.iscolor()) message="color display."; else message="no color display"; textbox = new TextBox("Check Colors", message, 17, 0); 12

13 13 textbox.addcommand(exit); textbox.setcommandlistener(this); public void startapp() display.setcurrent(textbox); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command command, Displayable displayable) if (command == exit) destroyapp(true); notifydestroyed(); OUTPUT: 13

14 14 ONLINE HELP AIM: To write and implement J2ME program in Creating Online Help. 14

15 15 CREATING AN INSTANCE OF THE ONLINE CLASS: 1. Declare references 2. Obtain a reference to the instance of the Display class 3. Create an instance of the command class to return from the help page 4. Create an instance of the command class to exit the MIDlet 5. Create an instance of the form class 6. Create an instance of the textbox class that contains the help text 7. Associate the instance of the back-command class with the instance of the textbox class 8. If the command is the back command, display the form 9. If the command is the exit command, terminate the MIDlet 10. If the command is the help command, display the textbox JADFILE: MIDlet-Name : online MIDlet version : 1.0 MID-vendor : My computer MID-jar-URL : online. Java MIDlet-1 : Display Alert, Display Alert Micro edition configuration: CLDC 1.0 Micro edition profile : MIDP 1.0 MIDlet JAR Size : 100 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class onlinehelp extends MIDlet implements CommandListener private Display display; private Command back; private Command exit; private Command help; private Form form; private TextBox msg; public onlinehelp() display=display.getdisplay(this); back=new Command("back",Command.BACK,2); exit=new Command("exit",Command.EXIT,1); help=new Command("help",Command.HELP,3); form=new Form("online help message"); msg=new TextBox("onlinehelp","press back to view the previous screen or press exit to view the first screen",81,0); msg.addcommand(back); form.addcommand(exit); form.addcommand(help); form.setcommandlistener(this); 15

16 16 msg.setcommandlistener(this); public void startapp() display.setcurrent(form); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command command,displayable displayable) if(command==back) display.setcurrent(form); else if(command==exit) destroyapp(false); notifydestroyed(); else if(command==help) display.setcurrent(msg); 16

17 17 OUTPUT: RADIOBUTTONS 17

18 18 AIM: To write and implement the J2ME program to Display a Radio Buttons. CREATING AN INSTANCE OF THE RADIOBUTTONS 1. Declare reference to classes. 2. Declare an instance of the display class. 3. Create an instance of the choice group class. 4. Associate option with the instance of the choice group class. 5. Set the default class. 6. Create an exit command. 7. Create an instance of the form class. 8. Associate the instance of choice group class to the instance of the form class. 9. Associate the exit command with the form. 10. Associate the command listener with form. 11. Associate an item state listener with the form. 12. Display the form. 13. Evaluate the command entered by the user. 14. If the command is the exit command, terminate the Midlet. 15. If an instance of the item class change state, read the selection form the instance of the choice group class. 16. Display the selection on the screen. JAD FILE: MIDlet-Name : Display Alert MIDlet version : 1.0 MID-vendor : My computer MID-jar-URL : displayalert.java MIDlet-1 : Display Alert, Display Alert Micro edition configuration: CLDC 1.0 Micro edition profile : MIDP 1.0 MIDlet JAR Size : 100 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class RadioButton extends MIDlet implements ItemStateListener,CommandListener private Display display; private Form form; private Command exit; private Item selection; private ChoiceGroupradioButtons; private int defaultindex; private int radiobuttonsindex; public RadioButton() 18

19 19 display=display.getdisplay(this); radiobuttons=new ChoiceGroup("select your color",choice.exclusive); radiobuttons.append("red",null); radiobuttons.append("green",null); radiobuttons.append("blue",null); radiobuttons.append("yellow",null); defaultindex=radiobuttons.append("all",null); radiobuttons.setselectedindex(defaultindex,true); exit=new Command("Exit",Command.EXIT,1); form=new Form(" "); radiobuttonsindex=form.append(radiobuttons); form.addcommand(exit); form.setcommandlistener(this); form.setitemstatelistener(this); public void startapp() display.setcurrent(form); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command command,displayable displayable) if(command==exit) destroyapp(true); notifydestroyed(); public void itemstatechanged(item item) if(item==radiobuttons) StringItemmsg=newStringItem("yourcoloris",radioButtons.getString (radiobuttons.getselectedindex())); form.append(msg); OUTPUT: 19

20 20 20

21 21 21

22 22 Threads & High-Level UI 22

23 23 ALERT CLASS AIM: To Write and implement a J2ME program to perform a alert class CREATING AN INSTANCE FOR ALERT CLASS: 1. Declare references 2. Set default values for exit flag of false 3. Create an instance of command class and exit the midlet 4. Create an instance of form class 5. Associate the command listener and form class 6. To display the instance of form class in screen 7. To display the instance of form class in screen 8. Exit command for terminate the middle 9. Display the instance of alert class as screen 10. Call the destroy App() 11. Trap exception throe within the command Action() 12. The midlet state change exception is thrown indicate the conditions are now safe to terminate the midlet by assigning a true value to the exit flag variables 13.Terminate the midlet when the exit command is entered the second time. JAD FILE: MIDlet-name : alert MIDlet-version :1.0 MIDlet-vendor : my first MIDlet-1 : alert, alert MIDlet-jar-URL : alert.jar/alert Midlet-jar-size : 100 Microedition-configuration : CLDC1.0 Microedition profile : MIDP-1.0 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class displayalert extends MIDlet implements CommandListener private Display display; private Form form; private Alert alert; private Command exit; private booleanee; public displayalert() ee=false; display=display.getdisplay(this); exit=new Command("exit",Command.SCREEN,1); form=new Form("Throw exception"); 23

24 24 form.addcommand(exit); form.setcommandlistener(this); public void startapp() display.setcurrent(form); public void pauseapp() public void destroyapp(boolean unconditional)throws MIDletStateChangeException if(unconditional==false) throw new MIDletStateChangeException(); public void commandaction(command command,displayable displayable) if(command==exit) try if(ee==false) alert=new Alert("Busy","please try again",null,alerttype.warning); alert.settimeout(alert.forever); display.setcurrent(alert,form); destroyapp(false); else destroyapp(true); notifydestroyed(); catch(midletstatechangeexception exception) ee=true; 24

25 25 OUTPUT: 25

26 26 DATE AND TIME AIM:To write and implement a J2ME program for display date and time in emulator. CREATING AN INSTANCE FOR DATE AND TIME 1. Create an instance of command class and exit midlet 2. Create a instance of frame class 3. Associate the instance of command class and form class 4. To associate the command listener and frame class 5. To display instance of frame class in display screen 6. Evaluate command selected by user 7. Exit command for terminate the midlet 8. Date field was taken as today 9. Display the today date and time 10.To start App() 11. Call the display screen 12. Pause the App() 13. Destroy the App() 14. To perform the commandaction display the screen 15. Exit from the MIDP JADFILE: MIDlet-NAME : TodatDate MIDlet-Vendor : My second MIDlet-Version : 1,2 MIDlet-1 : todaydate.data MIDlet-jar-url : todaydate.jar MIDlet-jar-size : 100 Microedition configuration : CLDC-1.0 Microedition Profile : MIDP-2.0 SOURCE CODE: import java.util.*; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class DateToday extends MIDlet implements CommandListener private Display display; private Form form; private Date today; private Command exit; private DateFielddatefield; public DateToday() display=display.getdisplay(this); form=new Form("Today's Date"); today=new Date(System.currentTimeMillis()); 26

27 27 datefield=new DateField("",DateField.DATE_TIME); datefield.setdate(today); exit=new Command("exit",Command.EXIT,1); form.append(datefield); form.addcommand(exit); form.setcommandlistener(this); public void startapp() display.setcurrent(form); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command command, Displayable displayable) if(command==exit) destroyapp(false); notifydestroyed(); 27

28 28 OUTPUT: 28

29 29 Text Field Class AIM: To Write and implement a J2ME program to perform a TextField. CREATING AN INSTANCE FOR DATE AND TIME 1. Declare references. 2. Obtain a reference to the instance of the Display class. 3. Create an instance of a Command class for the Submit class. 4. Create an instance of a Command class to exit the MIDlet. 5. Create an instance of the TextField class. 6. Create an instance of the Form class. 7. Associate the instance of the TextField class to the instance of the Form class. 8. Associate instances of the Command class to the instance of the Form class. 9. Associate a CommandListener with the instance of the Form class. 10. Display the instance of the Form class on the screen. 11. Evaluate the command selected by the user. 12. If the Exit command is selected, terminate the MIDlet. 13. If the Submit command is selected, process the instance of the TextField class. 14. Retrieve the text of the instance. 15. Concatenate the text to the Hello, greeting. 16. Replace the text in the instance. 17. Remove the Submit command. JADFILE: MIDlet-NAME :TextFieldCapture MIDlet-Vendor : My second MIDlet-Version : 1.0 MIDlet-1 :TextFieldCapture,, TextFieldCapture MIDlet-jar-url : textfield.jar MIDlet-jar-size : 100 Microedition configuration : CLDC-1.0 Microedition Profile : MIDP-2.0 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class TextFieldCapture extends MIDlet implements CommandListener private Display display; private Form form; private Command submit; private Command exit; 29

30 30 private TextFieldtextfield; public TextFieldCapture() display = Display.getDisplay(this); submit = new Command("Submit", Command.SCREEN, 1); exit = new Command("Exit", Command.EXIT, 1); textfield = new TextField("First Name:", "", 30, TextField.ANY); form = new Form("Sign In Please"); form.addcommand(exit); form.addcommand(submit); form.append(textfield); form.setcommandlistener(this); public void startapp() display.setcurrent(form); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command command, Displayable displayable) if (command == submit) textfield.setstring("hello, " + textfield.getstring()); form.removecommand(submit); else if (command == exit) destroyapp(false); notifydestroyed(); 30

31 31 OUTPUT: 31

32 32 Threads & Low-Level UI 32

33 33 FILLED RECTANGLE AIM:To write and implement a J2ME program for draw a rectangle. CREATING AN INSTANCE FOR FILLED RECTANGLE: 1. Declare references to classes. 2. Create instances of classes and assign those instances to references. 3. Display the instance of the Canvas class whenever the MIDlet is started. 4. Terminate the MIDlet when the Exit command is selected. 5. Define a class derived from the Canvas class that implementsa Command Listener. 6. Within the derived class, declare references. 7. Within the derived class, create an instance of the Command class. 8. Within the derived class, associate the instance of the Command classwith the canvas. 9. Within the derived class, associate the CommandListener with the canvas. 10. Within the derived class, define a paint() method to define the rectangulararea of the canvas where the rectangle is to be drawn. Specify the horizontaland vertical diameters of the arc if rounded corners are used in the rectangle.specify the color to be used to drawand fill the rectangle unless the defaultcolor is being used. 11. Within the derived class, define a commandaction() method to process the Exit command. JAD FILE: MIDlet-Name : RectangleExample MIDlet-Version : 1.0 MIDlet-Vendor : MyCompany MIDlet-Jar-URL : RectangleExample.jar MIDlet-1 : RectangleExample,,RectangleExample MicroEdition-Configuration : CLDC-1.0 MicroEdition-Profile : MIDP-1.0 MIDlet-JAR-SIZE : 100 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class RectangleExample extends MIDlet private Display display; private MyCanvas canvas; public RectangleExample () display = Display.getDisplay(this); canvas = new MyCanvas (this); protected void startapp() display.setcurrent( canvas ); 33

34 34 protected void pauseapp() protected void destroyapp( boolean unconditional ) public void exitmidlet() destroyapp(true); notifydestroyed(); class MyCanvas extends Canvas implements CommandListener private Command exit; private RectangleExamplerectangleExample; public MyCanvas (RectangleExamplerectangleExample) this.rectangleexample = rectangleexample; exit = new Command("Exit", Command.EXIT, 1); addcommand(exit); setcommandlistener(this); protected void paint(graphics graphics) graphics.setcolor(255,255,255); graphics.fillrect(0, 0, getwidth(), getheight()); graphics.setcolor(255,0,0); graphics.drawrect(2, 2, 20, 20); graphics.drawroundrect(20, 20, 60, 60, 15, 45); public void commandaction(command command, Displayable displayable) if (command == exit) rectangleexample.exitmidlet(); 34

35 35 OUTPUT: 35

36 36 FILLED ARC AIM: To write and implement a j2me program for filled Arc. CREATING AN INSTANCE FOR FILLED ARC: 1. Declare reference to classes 2. Create instance of classes and assign those instance to reference 3. Display the instance of the classes whenever the midlet is started 4. Terminate the midlet when the exit command is selected 5. Define a class derived from the canvas class that implements command listener 6. within the derived class, declare references 7. within the derived class associate the instance of command class 8. within the derived class create an instance of command class 9. within the derived class declare paint() method 10. within the derived class define a command Action() method to press the exit command 11. to terminate the midlet JAD FILE: MIDlet-Name :ArcExample MIDlet-Version : 1.0 MIDlet-Vendor : Ramesh MIDlet-Jar-URL : ArcExample.jar MIDlet-1 :ArcExample,, ArcExample MicroEdition-Configuration : CLDC-1.0 MicroEdition-Profile : MIDP-1.0 MIDlet-JAR-SIZE : 100 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class myfill extends MIDlet private Display d; private Mycanvas c; public myfill() d=display.getdisplay(this); c=new Mycanvas(); public void startapp() d.setcurrent(c); protected void pauseapp() 36

37 37 protected void destroyapp(boolean unconditional) public void exitmidlet() destroyapp(true); notifydestroyed(); class Mycanvas extends Canvas implements CommandListener private Command exit; private myfillcr; public void Mycanvas(myfillcr) this.cr=cr; exit=new Command("exit",Command.EXIT,1); addcommand(exit); setcommandlistener(this); public void paint(graphics g) g.setcolor(255,255,255); g.fillrect(0,0,getwidth(),getheight()); g.setcolor(255,0,0); g.fillarc(0,0,getwidth(),getheight(),180,180); public void commandaction(command cc,displayable dd) if(cc==exit); cr.exitmidlet(); 37

38 38 OUTPUT: 38

39 39 RECORD MANAGEMENT SYSTEM 39

40 40 Record Enumeration AIM: To write and implement the J2ME program to Display a Radio Buttons. CREATING AN INSTANCE OF THE RADIOBUTTONS 1. Declare references to classes. 2. Create instances of classes and assign those instances to references. 3. Open a record store and create a new record store if the record store doesn t exist. 4. Display any errors that occur when opening/creating a record store. 5. Create data in the appropriate data type. 6. Convert data to a byte array. 7. Write the record to the record store. 8. Display any errors that might occur while writing to the record store. 9. Create a RecordEnumeration. 10. Loop through the RecordEnumeration, copying each record to a variable. 11. Display the data in a dialog box. 12. Display any errors that occur when reading records from the RecordEnumeration. 13. Close and remove the RecordEnumeration and the record store. JAD FILE: MIDlet-Name : RecordEnumerationExample MIDLET version : 1.0 MID-vendor : My computer MID-jar-URL : RecordEnumerationExample.jar MIDlet-1 : RecordEnumerationExample,,RecordEnumerationExample Micro edition configuration: CLDC 1.0 Micro edition profile : MIDP 1.0 MIDlet JAR Size : 100 SOURCE CODE: import javax.microedition.rms.*; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import java.io.*; public class RecordEnumerationExample extends MIDlet implements CommandListener private Display display; private Alert alert; private Form form; private Command exit; private Command start; 40

41 41 private RecordStorerecordstore = null; private RecordEnumerationrecordEnumeration = null; public RecordEnumerationExample () display = Display.getDisplay(this); exit = new Command("Exit", Command.SCREEN, 1); start = new Command("Start", Command.SCREEN, 1); form = new Form("RecordEnumeration"); form.addcommand(exit); form.addcommand(start); form.setcommandlistener(this); public void startapp() display.setcurrent(form); public void pauseapp() public void destroyapp( boolean unconditional ) public void commandaction(command command, Displayable displayable) if (command == exit) destroyapp(true); notifydestroyed(); else if (command == start) try recordstore = RecordStore.openRecordStore("myRecordStore", true ); catch (Exception error) alert = new Alert("Error Creating",error.toString(), null, AlertType.WARNING); alert.settimeout(alert.forever); display.setcurrent(alert); 41

42 42 try String outputdata[] = "First Record","Second Record", "Third Record"; for (int x = 0; x < 3; x++) byte[] byteoutputdata = outputdata[x].getbytes(); recordstore.addrecord(byteoutputdata,0, byteoutputdata.length); catch ( Exception error) alert = new Alert("Error Writing", error.tostring(), null, AlertType.WARNING); alert.settimeout(alert.forever); display.setcurrent(alert); try StringBuffer buffer = new StringBuffer(); recordenumeration = recordstore.enumeraterecords(null, null, false); while (recordenumeration.hasnextelement()) buffer.append(new String(recordEnumeration.nextRecord())); buffer.append("\n"); alert = new Alert("Reading", buffer.tostring(), null, AlertType.WARNING); alert.settimeout(alert.forever); display.setcurrent(alert); catch (Exception error) alert = new Alert("Error Reading",error.toString(), null, AlertType.WARNING); alert.settimeout(alert.forever); display.setcurrent(alert); try recordstore.closerecordstore(); 42

43 43 catch (Exception error) alert = new Alert("Error Closing",error.toString(), null, AlertType.WARNING); alert.settimeout(alert.forever); display.setcurrent(alert); if (RecordStore.listRecordStores()!= null) try RecordStore.deleteRecordStore("myRecordStore"); recordenumeration.destroy(); catch (Exception error) alert = new Alert("Error Removing", error.tostring(), null, AlertType.WARNING); alert.settimeout(alert.forever); display.setcurrent(alert); OUTPUT: 43

44 44 44

45 45 SORTING AIM:To write a j2me program for the sorting records from the file display on the Midlet. CREATING AN INSTANCE FOR SORTING: 1. Declare references for the classes 2. Create instance as classes and assign those the instances to references 3. Open a record store and create new record store with the record store does t exist 4. Display any errors that occurred in opening /creating a record store 5. Create a data in appropriate data type 6. Convert data to byte array 7. Write the record to the record store 8. Display any errors that might occurred while writing to the record store 9. Create a comparator class with a method that compares two records 10. Create an instances of comparator class and use the instance then creating record enumeration 11. Loop through the record enumeration 12. Display the data in dialog box 13. Display any errors that occurred reading records 14. Close the record enumeration JAD FILE: MIDlet-name : mysort MIDlet-version : 1.0 MIDlet-vendor : myname MIdlet-1 : mysort,,mysort MIDlet-JAR-URL : mysort.jar MIDlet-JAR-SIZE : 100 Microedition-profile : MIDP-1.0 Microedition-configuration : CLDC-1.0 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import javax.microedition.rms.*; import java.io.*; public class mysort extends MIDlet implements CommandListener private Display d; private Alert a; private Form f; private Command exit; 45

46 46 private Command start; private RecordStorers=null; private RecordEnumeration rm=null; private Comparator cs; public mysort() d=display.getdisplay(this); exit=new Command("exit",Command.EXIT,1); start=new Command("start",Command.START,1); f=new Form("my records"); f.addcommand(exit); f.addcommand(start); f.setcommandlistener(this); public void startapp() d.setcurrent(f); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command cc,displayable dd) if(cc==exit) destroyapp(true); notifydestroyed(); else if(cc==start) try rs=recordstore.openrecordstore("my records",true); catch(exception error) a=new Alert("error creating",error.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); try String opd[]="hari","vamsi","anusha"; for(int x=0;x<=3;x++) 46

47 47 byte[] bod=opd[x].getbytes(); rs.addrecord(bod,0,bod.lenght); catch(exception error) a=new Alert("open a record",error.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); try StringBuffer s=new StringBuffer(); Comparator cs=new Comparator(); rm=rs.enumeraterecords(null,cs,null); while(rm.hasnextrecord()) s.append(new String(rm.NextRecord())); s.append("\n"); a=new Alert("error creating",s.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); catch(exception error) a=new Alert("reading",error.toString(),null,AlertType.WARNING); a.settimeout(alert.forever); d.setcurrent(a); try rs.closerecordstore(); catch(exception error) a=new Alert("error closing",error.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); if(recordstore.listrecordstores()!=null) try RecordStore.deleteRecordStore("my record deetes"); rm.destroy(); 47

48 48 catch(exception error) a=new Alert("error closed",error.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); class Comparator implements RecordComparator public int Compare(byte[] record1,byte[] record2); String s1=new String(record1); String s2=new String(record2); int c=s1.compareto(s1); if(c==0) return RecordComparator.EQUIVALENT; else if(c<0) return RecordComparator.PRECEDES; else return RecordComparator.FOLLOWS; 48

49 49 OUTPUT: 49

50 50 SEARCHING AIM:To write a j2me program for the searching records and then display on the midlet. CREATING AN INSTANCE FOR SEARCHING: 1. Declare references for the classes 2. Create instance as classes and assign those the instances to references 3. Open a record store and create new record store with the record store does t exist 4. Display any errors that occurred in opening /creating a record store 5. Create a data in appropriate data type 6. Convert data to byte array output stream 7. Create a data output stream using the byte array output stream 8. Write the record to the record store 9. Display any errors that might occurred while writing to the record store 10. Create a buffer as byte sufficient to hold a record 11. Create a byte array input stream and data input stream 12. Display any errors that occurred then reading records from the record store 13. Close and remove enumeration and record store JAD FILE: MIDlet-name : mysearch MIDlet-version : 1.0 MIDlet-vendor : myname MIdlet-1 : mysearch,,mysearch MIDlet-JAR-URL : mysort.jar MIDlet-JAR-SIZE : 100 Microedition-profile : MIDP-1.0 Microedition-configuration : CLDC-1.0 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import javax.microedition.rms.*; import java.io.*; public class mysearch extends MIDlet implements CommandListener private Display d; private Alert a; private Form f; private Command exit; private Command start; private RecordStorers=null; private RecordEnumeration rm=null; 50

51 51 private Comparator cs; public mysort() d=display.getdisplay(this); exit=new Command("exit",Command.EXIT,1); start=new Command("start",Command.START,1); f=new Form("my records"); f.addcommand(exit); f.addcommand(start); f.setcommandlistener(this); public void startapp() d.setcurrent(f); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command cc,displayable dd) if(cc==exit) destroyapp(true); notifydestroyed(); else if(cc==start) try rs=recordstore.openrecordstore("my records",true); catch(exception error) a=new Alert("error creating",error.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); try String opd[]="hari","vamsi","anusha"; for(int x=0;x<=3;x++) byte[] bod=opd[x].getbytes(); rs.addrecord(bod,0,bod.lenght); 51

52 52 catch(exception error) a=new Alert("open a record",error.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); try StringBuffer s=new StringBuffer(); Comparator cs=new Comparator(); rm=rs.enumeraterecords(null,cs,null); while(rm.hasnextrecord()) s.append(new String(rm.NextRecord())); s.append("\n"); a=new Alert("error creating",s.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); catch(exception error) a=new Alert("reading",error.toString(),null,AlertType.WARNING); a.settimeout(alert.forever); d.setcurrent(a); try rs.closerecordstore(); catch(exception error) a=new Alert("error closing",error.tostring(),null,alerttype.warning); a.settimeout(alert.forever); d.setcurrent(a); if(recordstore.listrecordstores()!=null) try RecordStore.deleteRecordStore("my record deetes"); rm.destroy(); catch(exception error) a=new Alert("error closed",error.tostring(),null,alerttype.warning); 52

53 53 a.settimeout(alert.forever); d.setcurrent(a); class Comparator implements RecordComparator public int Compare(byte[] record1,byte[] record2); String s1=new String(record1); String s2=new String(record2); int c=s1.compareto(s1); if(c==0) return RecordComparator.EQUIVALENT; else if(c<0) return RecordComparator.PRECEDES; else return RecordComparator.FOLLOWS; 53

54 54 OUTPUT: 54

55 55 BARGRAPH AIM: To write and implement j2me program for displaying bar graph in our MIDP. CREATING AN INSTANCE FOR BARGRAPH: 1. Declare references for the classes 2. Create instance as classes and assign those the instances to references 3. Declaring the canvas class and implements the canvas 4. Open a record store and create new record store with the record store does t exist 5. Display any errors that occurred in opening /creating a record store 6. Create a data in appropriate data type 7. Convert data to byte array output stream 8. Create a data output stream using the byte array output stream 9. Write the record to the record store 10. Display any errors that might occurred while writing to the record store 11. Create a buffer as byte sufficient to hold a record 12. Create a byte array input stream and data input stream 13. Display any errors that occurred then reading records from the record store 14. Close and remove enumeration and record store 15. Create a bar chart according to our given values based on canvas class JAD FILE: MIDlet-name :bar chart MIDlet-version :1.0 MIDlet-vendor :myname MIdlet-1 :bar chart, bar chart MIDlet-JAR-URL :bar chart.jar MIDlet-JAR-SIZE :100 Microedition-profile :MIDP-1.0 Microedition-configuration :CLDC-1.0 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class BarGraph extends MIDlet implements CommandListener public Form form; public Command exit; public Command ok; public Command back; public Displayable d; public Display display; public TextField textfield1; public TextField textfield2; public TextField textfield3; public TextField textfield4; 55

56 56 public TextField textfield5; public BarGraph() display=display.getdisplay(this); form=new Form("BarGraph"); textfield1=new TextField("Value1:-","",30,TextField.ANY); textfield2=new TextField("Value2:-","",30,TextField.ANY); textfield3=new TextField("Value3:-","",30,TextField.ANY); textfield4=new TextField("Value4:-","",30,TextField.ANY); textfield5=new TextField("Value5:-","",30,TextField.ANY); form.append(textfield1); form.append(textfield2); form.append(textfield3); form.append(textfield4); form.append(textfield5); ok=new Command("Ok",Command.OK,1); exit=new Command("Exit",Command.EXIT,1); back=new Command("Back",Command.BACK,1); form.addcommand(ok); form.addcommand(exit); form.setcommandlistener(this); public void startapp() display.setcurrent(form); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command command,displayable displayable) if(displayable==form) if(command==ok) int[] data=new int[5]; data[0]=integer.parseint(textfield1.getstring()); data[1]=integer.parseint(textfield2.getstring()); data[2]=integer.parseint(textfield3.getstring()); data[3]=integer.parseint(textfield4.getstring()); data[4]=integer.parseint(textfield5.getstring()); d=new BarCanvas(data); d.addcommand(back); d.setcommandlistener(this); 56

57 57 display.setcurrent(d); else if(command==exit) notifydestroyed(); else if(displayable==d) if(command==back) display.setcurrent(form); class BarCanvas extends Canvas int[] data; public int x; public int y; public int y1; public int h; public BarCanvas(int[] data) this.data=data; x=10; public void paint(graphics g) g.setcolor(255, 255, 255); g.fillrect(0, 0, this.getwidth(), this.getheight()); g.setcolor(255, 125, 100); int i=0; y1=data[0]; h=200; while(i<data.length) y=data[i]; h=200+y1-y; g.fillrect(x, this.getheight()-y,25, h); x+=30; i++; 57

58 58 OUTPUT: 58

59 59 PIE CHART AIM: To write and implement an j2me program for creating an pie chart. CREATING AN INSTANCE FOR PIECHART: 1. Declare references for the classes 2. Create instance as classes and assign those the instances to references 3. Declaring the canvas class and implements the canvas 4. Open a record store and create new record store with the record store does t exist 5. Display any errors that occurred in opening /creating a record store 6. Create a data in appropriate data type 7. Convert data to byte array output stream 8. Create a data output stream using the byte array output stream 9. Write the record to the record store 10. Display any errors that might occurred while writing to the record store 11. Create a buffer as byte sufficient to hold a record 12. Create a byte array input stream and data input stream 13. Display any errors that occurred then reading records from the record store 14. Close and remove enumeration and record store 15. Create a PIE chart according to our given values based on canvas class JAD FILE: MIDlet-name :bar chart MIDlet-version :1.0 MIDlet-vendor :myname MIdlet-1 :bar chart, bar chart MIDlet-JAR-URL :bar chart.jar MIDlet-JAR-SIZE :100 Microedition-profile :MIDP-1.0 Microedition-configuration :CLDC-1.0 SOURCE CODE: importjavax.microedition.lcdui.canvas; importjavax.microedition.lcdui.command; importjavax.microedition.lcdui.commandlistener; importjavax.microedition.lcdui.display; importjavax.microedition.lcdui.displayable; importjavax.microedition.lcdui.graphics; importjavax.microedition.midlet.midlet; publicclasspiechartmidletextends MIDlet implementscommandlistener private Command exitcommand; publicvoidstartapp() Display display = Display.getDisplay(this); 59

60 60 int[] data = 10, 20, 30, 40, 20 ; Displayable d = newpiechartcanvas(data); exitcommand = newcommand("exit", Command.EXIT, 1); d.addcommand(exitcommand); d.setcommandlistener(this); display.setcurrent(d); publicvoidpauseapp() publicvoiddestroyapp(boolean unconditional) publicvoidcommandaction(command c, Displayable s) notifydestroyed(); classpiechartcanvasextends Canvas int[] data; intcolors[] = 0xFF0000, 0xA9E969, 0x00FFFF, 0xC675EC, 0x008800, 0x00C400 ; publicpiechartcanvas(int[] data) this.data = data; publicvoidpaint(graphics g) int width = this.getwidth(); int height = this.getheight(); g.setcolor(255, 255, 255); g.fillrect(0, 0, width, height); int sum = 0; for (inti = 0; i<data.length; i++) sum += data[i]; intdeltaangle = 360 * 100 / sum / 100; int x = 4; int y = 4; int diameter; if (width > height) diameter = height - y * 2; else diameter = width - x * 2; intstartangle = 0; for (inti = 0; i<data.length; i++) g.setcolor(colors[i]); g.fillarc(x, y, diameter, diameter, startangle, deltaangle * data[i]); startangle += deltaangle * data[i]; 60

61 61 OUTPUT: 61

62 62 IMAGE AIM: To write and implement a j2me program for draw an image in midpmidlet. CRAETING AN INSTANCE FOR IMAGE: 1. Declare references to classes. 2. Create instances of classes and assign those instances to references. 3. Display the instance of the Canvas class whenever the MIDlet is started. 4. Terminate the MIDlet when the Exit command is selected. 5. Define a class derived from the Canvas class that implements a CommandListener. 6. Within the derived class, declare references. 7. Within the derived class, create an instance of the Command class. 8. Within the derived class, associate the instance of the Command class with the canvas. 9. Within the derived class, associate the CommandListener with the canvas. 10. Request a block of memory sufficient to hold the image, and then create the image, if you are using a mutable image. Otherwise, identify the file namethat contains the immutable image. Display an error message if there is a problem creating the image or opening the file that contains the image. 11. Within the derived class, define a paint() method that determines whether the image was successfully created or the image file was successfully opened. If so, then draw the image on the canvas. 12.Within the derived class, define a commandaction() method to process the Exit command. JAD FILE: MIDlet-name :image MIDlet-version :1.0 MIDlet-vendor :myimage MIdlet-1 :image, my image MIDlet-JAR-URL :image.jar MIDlet-JAR-SIZE :100 Microedition-profile :MIDP-1.0 Microedition-configuration :CLDC-1.0 SOURCE CODE: import javax.microedition.midlet.*; import javax.microedition.lcdui.*; public class MutableImageExample extends MIDlet private Display display; private MyCanvas canvas; public MutableImageExample () display = Display.getDisplay(this); canvas = new MyCanvas (this); 62

63 63 protected void startapp() display.setcurrent( canvas ); protected void pauseapp() protected void destroyapp( boolean unconditional ) public void exitmidlet() destroyapp(true); notifydestroyed(); class MyCanvas extends Canvas implements CommandListener private Command exit; private MutableImageExamplemutableImageExample; private Image image = null; public mycanvas(mutableimageexamplemutableimageexample) this. mutableimageexample = mutableimageexample; exit = new Command("Exit", Command.EXIT, 1); addcommand(exit); setcommandlistener(this); try image = Image.createImage(70, 70); Graphics graphics = image.getgraphics(); graphics.setcolor(255, 0, 0); graphics.fillarc(10, 10, 60, 50, 180, 180); catch (Exception error) Alert alert = new Alert( Failure, Creating Image, null, null); alert.settimeout(alert.forever); display.setcurrent(alert); protected void paint(graphics graphics) if (image!= null) graphics.setcolor(255,255,255); graphics.fillrect(0, 0, getwidth(), getheight()); 63

64 64 graphics.drawimage(image, 30, 30, Graphics.VCENTER Graphics.HCENTER); public void commandaction(command command, Displayable display) if (command == exit) mutableimageexample.exitmidlet(); OUTPUT: 64

65 65 AIM: Design a client server communication in j2me Retrieving Information from a Web Server Here are the steps required to retrieve information from a web server: 1. Declare references. 2. Obtain a reference to the instance of the Display class. 3. Create an instance of a Command class to exit the MIDlet. 4. Create an instance of a Command class to start the MIDlet. 5. Create an instance of the Form class. 6. Associate the instance of the Command class to the instance of the Form class. 7. Associate a CommandListener with the instance of the Form class. 8. Display the instance of the Form class on the screen. 9. If the Start command is selected, create references to a StreamConnection and InputStream. 10. Create a StringBuffer to store characters read from the input stream. 11. Open a connection to the server. 12. Open an input stream. 13. Read each byte from the input stream and append the byte to the StringBuffer. 14. Assign the contents of the StringBuffer to a String after the last character is read from the input stream. 15. Parse the string if necessary, and display the string in an alert dialog box. 16. If the Exit command is selected, terminate the MIDlet. 17. Trap exceptions thrown within the commandaction() method. 18. If the MIDletStateChangeException is thrown, indicate that conditions are now safe to terminate the MIDlet by assigning a true value to the exit flag variable. 19. Terminate the MIDlet when the Exit command is entered the second time. import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import java.io.*; import javax.microedition.io.*; import java.util.*; public class HttpExample extends MIDlet implements CommandListener private Command exit, start; private Display display; private Form form; private StringItem stars; public HttpExample () display = Display.getDisplay(this); exit = new Command("Exit", Command.EXIT, 1); start = new Command("Start", Command.EXIT, 1); form = new Form("Customer Ranking"); form.addcommand(exit); form.addcommand(start); form.setcommandlistener(this); 65

66 66 public void startapp() throws MIDletStateChangeException display.setcurrent(form); public void pauseapp() public void destroyapp(boolean unconditional) public void commandaction(command command, Displayable displayable) if (command == exit) destroyapp(false); C h a p t e r 1 3 : G e n e r i c C o n n e c t i o n F r a m e w o r k 587 Listing 13-1 Retrieving information from a web server notifydestroyed(); else if (command == start) StreamConnection connection = null; InputStream in = null; StringBuffer buffer = new StringBuffer(); try connection = (StreamConnection) Connector.open( " in = connection.openinputstream(); int ch; while ((ch = in.read())!= -1) if (ch!= '\n') buffer.append((char)ch); else String line = new String (buffer.tostring()); if(line.equals("out of 5 stars")) 66

67 67 int position = line.indexof("alt="); Alert alert = new Alert( "Rating", line.substring(position + 5, position + 8), null, null); alert.settimeout(alert.forever); alert.settype(alerttype.error); display.setcurrent(alert); buffer = new StringBuffer(); catch (IOException error) Alert alert = new Alert("Error", "Cannot connect", null, null); alert.settimeout(alert.forever); alert.settype(alerttype.error); display.setcurrent(alert); OUTPUT 67