Contoh Program Java Mobile

Ini merupakan salah satu contoh program menggunakan Java Mobile, yang saya pelajari dari Mata Kuliah Pemrograman Dasar dan berikut langkah-langkahnya :

• Pilih New Project – Mobile – Mobile Application.
• hapus centang pada set as main project dengan create xxx.
• klik  next dan centang pada CLDC-1.0 dan MIDP-1.0
• finish.
• klik kanan pada default package – visual midlet.
• pada jendela screens, klik Form lalu tarik kedalam Frame.
• pada jendela Commands, tarik ok Commands dan exit Commands kedalam form.

Gambar :

Berikut adalah source codenya :

package hello;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
 * @author babycorn
 */

public class VisualMIDlet extends MIDlet implements CommandListener {

     private Display display;
     private Form frmDP,fmHas;
     private Command Ok, Exit, Back;
     private TextField tfNama,tfNIM,tfTglLahir,tfAlamat;
     private ChoiceGroup cgProdi;
     private ChoiceGroup choicePopup;
     private ChoiceGroup choiceMul;
     private int choiceGroupIndex,popGroupIndex;
     private StringItem siNama, siNIM, siAlamat, siTglLhr, siProdi,siPop;
     private boolean midletPaused = false;
     Ticker tfTicker;
     Image img;

    //                      
    //                    

    public VisualMIDlet() {

    }

    //                       
    //                     

    //                                           
    /**
     * Initilizes the application.
     * It is called only once when the MIDlet is started. The method is called before the startMIDlet method.
     */
    private void initialize() {                                         
        // write pre-initialize user code here
                                           
        // write post-initialize user code here
    }                            
    //                          

    //                                        
    /**
     * Performs an action assigned to the Mobile Device - MIDlet Started point.
     */
    public void startMIDlet() {                                      
        // write pre-action user code here
                                        
        // write post-action user code here
    }                             
    //                           

    //                                         
    /**
     * Performs an action assigned to the Mobile Device - MIDlet Resumed point.
     */
    public void resumeMIDlet() {                                       
        // write pre-action user code here
                                         
        // write post-action user code here
    }                              
    //                            

    //                                              
    /**
     * Switches a current displayable in a display. The display instance is taken from getDisplay method. This method is used by all actions in the design for switching displayable.
     * @param alert the Alert which is temporarily set to the display; if null, then nextDisplayable is set immediately
     * @param nextDisplayable the Displayable to be set
     */
    public void switchDisplayable(Alert alert, Displayable nextDisplayable) {                                            
        // write pre-switch user code here
        Display display = getDisplay();                                               
        if (alert == null) {
            display.setCurrent(nextDisplayable);
        } else {
            display.setCurrent(alert, nextDisplayable);
        }                                             
        // write post-switch user code here
    }                                   
    //                                 
   
    public Display getDisplay () {
        return Display.getDisplay(this);
    }
   
    public void startApp() {
        display = Display.getDisplay(this);
            try {
                img=Image.createImage("/hello/poltek.png");
            } catch (Exception e){}

                //membuat tombol
                Ok = new Command("Ok", Command.SCREEN, 0);
                Exit = new Command("Exit", Command.EXIT, 0);
                Back = new Command("Back", Command.BACK, 0);

                //textfield untuk data pribadi
                tfTicker = new Ticker("Welcome To My Application");
                tfNama = new TextField("Nama: ", "", 30, TextField.ANY);
                tfNIM = new TextField("NIM :", "", 30, TextField.ANY);
                tfAlamat = new TextField ("Alamat :", "", 30, TextField.ANY);
                tfTglLahir = new TextField("Tanggal Lahir: ", "", 30, TextField.ANY);

                
                //pemilihan Prodi
                cgProdi = new ChoiceGroup("Kelamin", Choice.EXCLUSIVE);
                cgProdi.append("Laki-laki", null);
                cgProdi.append("Perempuan", null);

                choicePopup = new ChoiceGroup("Prodi", Choice.POPUP);
                choicePopup.append("Manajemen Informatika", null);
                choicePopup.append("Teknik Komputer", null);
                choicePopup.append("Rekam Medik", null);
                choicePopup.append("Gizi Klinik", null);
                choicePopup.append("Manajemen Agribisnis", null);
                choicePopup.append("Manajemen Industri", null);
                choicePopup.append("Bahasa Inggris", null);


                //membuat form dan memasukkan komponen
                frmDP = new Form("Data Pribadi");
                frmDP.setTicker(tfTicker);
                frmDP.append(img);
                frmDP.addCommand(Exit);
                frmDP.addCommand(Ok);
                frmDP.append(tfNama);
                frmDP.append(tfNIM);
                frmDP.append(tfAlamat);
                frmDP.append(tfTglLahir);
                choiceGroupIndex = frmDP.append(cgProdi);
                popGroupIndex = frmDP.append(choicePopup);
                
                frmDP.setCommandListener(this);

                //membuat form hasil input user
                fmHas = new Form("Profile Anda");
                siNama = new StringItem("Nama : ", null);
                siNIM = new StringItem ("NIM : ", null);
                siAlamat = new StringItem ("Alamat : ", null);
                siTglLhr = new StringItem("Tanggal Lahir : ", null);
                siProdi = new StringItem("Kelamin : ", null);
                siPop = new StringItem("Prodi : ", null);

                //menampilkan StringItem yang nanti akan diisi oleh data hasil input user
                fmHas.append(img);
                fmHas.append(siNama);
                fmHas.append(siNIM);
                fmHas.append(siAlamat);
                fmHas.append(siTglLhr);
                fmHas.append(siProdi);
                fmHas.append(siPop);

                //menambahkan command
                fmHas.addCommand(Back);
                fmHas.setCommandListener(this);

                //menampilkan form DataPribadi sebagai tampilan awal
                display.setCurrent(frmDP);
    }
   
    public void pauseApp() {
       
    }

    public void destroyApp(boolean unconditional) {
    }

    public void commandAction(Command c, Displayable d) {
       //variable string untuk menampung inputan user
                String nama,nim,alamat,tgllhr,kelamin,prodi = null;

                //jika tombol/command OK ditekan
                if(c == Ok){
                        //mendapatkan inputan user
                        nama = tfNama.getString();
                        nim = tfNIM.getString();
                        alamat = tfAlamat.getString();
                        tgllhr = tfTglLahir.getString();
                        kelamin = cgProdi.getString(cgProdi.getSelectedIndex());
                        prodi = choicePopup.getString(choicePopup.getSelectedIndex());
                        
                        //memasukkan hasil input ke StringItem
                        siNama.setText(nama);
                        siNIM.setText(nim);
                        siAlamat.setText(alamat);
                        siTglLhr.setText(tgllhr);
                        siProdi.setText(kelamin);
                        siPop.setText(prodi);
                        
                        //menampilkan form hasil setelah cmOk ditekan
                        display.setCurrent(fmHas);

                } else if(c == Exit){ //jika tombol/command Exit ditekan
                        destroyApp(true);
                        notifyDestroyed();

                } else if(c == Back){ //jika tombol/command Back ditekan
                        //menampilkan kembali form DataPribadi sebagai tampilan default/awal
                        display.setCurrent(frmDP);
                }
    }

}

Ya semoga bermanfaat :)