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Java环境中封装多MIDIet程序

  你可以将多个MIDIet程序存储在一个JAR文件中。设备会自动显示一个MIDIet的菜单,又用户选择运行哪个MIDIet程序。    以下的例子中包含所有你所需要的: 两个简单MIDIet程序的源代码,一个存储在JAR文件中的表单文件(MANIFEST),一个JAVA文件描述符文件(.jad),MIDIet的图象文件(.png),还有一个用于运行MIDIet程序和编译,预检,创建JAR文件的DOS批处理文件。    源代码1:  /*—————————————————-  * www.CoreJ2ME.com  *  * Simple MIDlet1  *—————————————————*/  import javax.microedition.midlet.*;  import javax.microedition.lcdui.*;    public class MIDlet1 extends MIDlet implements CommandListener  {  private Display display; // Reference to Display object  private TextBox tbxMain; // A Textbox to display a message  private Command cmdExit; // A Command to exit the MIDlet    // The constructor  public MIDlet1()  {  display = Display.getDisplay(this);    cmdExit = new Command(“Exit”, Command.SCREEN, 1);    tbxMain = new TextBox(“Welcome”, “Core J2ME”, 50, 0);  tbxMain.addCommand(cmdExit);  tbxMain.setCommandListener(this);  }    // Called by application manager to start the MIDlet.  public void startApp()  {  display.setCurrent(tbxMain);  }    // A required method  public void pauseApp()  { }    // A required method  public void destroyApp(boolean unconditional)  { }    // Check to see if our Exit command was selected  public void commandAction(Command c, Displayable s)  {  if (c == cmdExit)  {  destroyApp(false);  notifyDestroyed();  }  }  }    源代码2:    /*—————————————————-  * www.CoreJ2ME.com  *  * Simple MIDlet2  *—————————————————*/    import javax.microedition.midlet.*;  import javax.microedition.lcdui.*;    public class MIDlet2 extends MIDlet implements CommandListener  {  private Display display; // Reference to Display object  private Form frmMain; // The main form  private TextField txfName; // A text field to prompt for name  private Command cmdExit; // A Command to exit the MIDlet    // The constructor  public MIDlet2()  {  display = Display.getDisplay(this);    cmdExit = new Command(“Exit”, Command.SCREEN, 1);    txfName = new TextField(“Name:”, “”, 10, TextField.ANY);    frmMain = new Form(“Sample Form”);  frmMain.addCommand(cmdExit);  frmMain.append(txfName);  frmMain.setCommandListener(this);  }    // Called by application manager to start the MIDlet.  public void startApp()  {  display.setCurrent(frmMain);  }    // A required method  public void pauseApp()  { }    // A required method  public void destroyApp(boolean unconditional)  { }    // Check to see if our Exit command was selected  public void commandAction(Command c, Displayable s)  {  if (c == cmdExit)  {  destroyApp(false);  notifyDestroyed();  }  }  }    —————————————————    mainfest.mf 文件(要存到JAR文件里):    MIDlet-Name: TwoMIDlets  MIDlet-Version: 1.0  MIDlet-Vendor: Core J2ME Technology  MIDlet-1: MIDlet1,/image1.png, MIDlet1  MIDlet-2: MIDlet2,/image2.png, MIDlet2  MicroEdition-Configuration: CLDC-1.0  MicroEdition-Profile&: MIDP-1.0    MIDlet.jad 文件    MIDlet-Name: TwoMIDlets  MIDlet-Version: 1.0  MIDlet-Vendor: Core J2ME Technology  MIDlet-Description: Packaging multiple MIDlets  MIDlet-Jar-URL: MIDlet.jar  MIDlet-Jar-Size: 3144  MIDlet-1: MIDlet1,/image1.png, MIDlet1  MIDlet-2: MIDlet2,/image2.png, MIDlet2  ————————————————–  Emulator的显示结果:  从左向右:  1。显示MIDIet程序的菜单。  2。运行MIDIet 1  3。运行MIDIet 2     

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