LWUIT与LCDUI的结合

Lwuit与Lcdui可以相互调用，如果需要在一个Midlet中同时使用Lwuit和Lcdui库，需要在Midlet中保留一个Lcdui Display的全局变量，可以在startApp方法中初始化。示例如下：

private javax.microedition.lcdui.Display lcduiDisplay;

//....

public void startMIDlet() {
//...
    lcduiDisplay = Display.getDisplay( this );
//...
}

如果是从Lwuit切换到Lcdui，通过使用Lcdui Display的setCurrent方法，示例如下：

lcduiDisplay.setCurrent(lcduiForm);

如果是从Lcdui切换到Lwuit，先初始化Lwuit Display，然后调用Component的show方法，示例如下：

com.sun.lwuit.Display.init( this );
com.sun.lwuit.Form lwuitForm = new com.sun.lwuit.Form( "LWUIT FORM" );
//...
lwuitForm.show();

附源代码：

/*

* To change this template, choose Tools | Templates

* and open the template in the editor.

*/

package DemoLwuitLcdui;

import com.sun.lwuit.events.ActionEvent;

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

/**

* @author Administrator

*/

public class DemoLwuitLcduiMIDlet extends MIDlet implements CommandListener {

private boolean midletPaused = false;

//<editor-fold defaultstate="collapsed" desc=" Generated Fields ">//GEN-BEGIN:|fields|0|

private Command exitCommand;

private Command switchToLwuitFormCommand;

private Form lcduiForm;

private StringItem stringItem;

//</editor-fold>//GEN-END:|fields|0|

private com.sun.lwuit.Display lwuitDisplay;

private javax.microedition.lcdui.Display lcduiDisplay;

/**

* The DemoLwuitLcduiMIDlet constructor.

*/

public DemoLwuitLcduiMIDlet() {

}

//<editor-fold defaultstate="collapsed" desc=" Generated Methods ">//GEN-BEGIN:|methods|0|

//</editor-fold>//GEN-END:|methods|0|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: initialize ">//GEN-BEGIN:|0-initialize|0|0-preInitialize

/**

* Initilizes the application.

* It is called only once when the MIDlet is started. The method is called before the <code>startMIDlet</code> method.

*/

private void initialize() {//GEN-END:|0-initialize|0|0-preInitialize

// write pre-initialize user code here

//GEN-LINE:|0-initialize|1|0-postInitialize

// write post-initialize user code here

}//GEN-BEGIN:|0-initialize|2|

//</editor-fold>//GEN-END:|0-initialize|2|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: startMIDlet ">//GEN-BEGIN:|3-startMIDlet|0|3-preAction

/**

* Performs an action assigned to the Mobile Device - MIDlet Started point.

*/

public void startMIDlet() {//GEN-END:|3-startMIDlet|0|3-preAction

// write pre-action user code here

switchDisplayable(null, getLcduiForm());//GEN-LINE:|3-startMIDlet|1|3-postAction

//lwuitDisplay = com.sun.lwuit.Display.getInstance();

lcduiDisplay = Display.getDisplay(this);

// write post-action user code here

}//GEN-BEGIN:|3-startMIDlet|2|

//</editor-fold>//GEN-END:|3-startMIDlet|2|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: resumeMIDlet ">//GEN-BEGIN:|4-resumeMIDlet|0|4-preAction

/**

* Performs an action assigned to the Mobile Device - MIDlet Resumed point.

*/

public void resumeMIDlet() {//GEN-END:|4-resumeMIDlet|0|4-preAction

// write pre-action user code here

//GEN-LINE:|4-resumeMIDlet|1|4-postAction

// write post-action user code here

}//GEN-BEGIN:|4-resumeMIDlet|2|

//</editor-fold>//GEN-END:|4-resumeMIDlet|2|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: switchDisplayable ">//GEN-BEGIN:|5-switchDisplayable|0|5-preSwitch

/**

* Switches a current displayable in a display. The <code>display</code> instance is taken from <code>getDisplay</code> 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 <code>null</code>, then <code>nextDisplayable</code> is set immediately

* @param nextDisplayable the Displayable to be set

*/

public void switchDisplayable(Alert alert, Displayable nextDisplayable) {//GEN-END:|5-switchDisplayable|0|5-preSwitch

// write pre-switch user code here

Display display = getDisplay();//GEN-BEGIN:|5-switchDisplayable|1|5-postSwitch

if (alert == null) {

display.setCurrent(nextDisplayable);

} else {

display.setCurrent(alert, nextDisplayable);

}//GEN-END:|5-switchDisplayable|1|5-postSwitch

// write post-switch user code here

}//GEN-BEGIN:|5-switchDisplayable|2|

//</editor-fold>//GEN-END:|5-switchDisplayable|2|

//<editor-fold defaultstate="collapsed" desc=" Generated Method: commandAction for Displayables ">//GEN-BEGIN:|7-commandAction|0|7-preCommandAction

/**

* Called by a system to indicated that a command has been invoked on a particular displayable.

* @param command the Command that was invoked

* @param displayable the Displayable where the command was invoked

*/

public void commandAction(Command command, Displayable displayable) {//GEN-END:|7-commandAction|0|7-preCommandAction

// write pre-action user code here

if (displayable == lcduiForm) {//GEN-BEGIN:|7-commandAction|1|19-preAction

if (command == exitCommand) {//GEN-END:|7-commandAction|1|19-preAction

// write pre-action user code here

exitMIDlet();//GEN-LINE:|7-commandAction|2|19-postAction

// write post-action user code here

} else if (command == switchToLwuitFormCommand) {//GEN-LINE:|7-commandAction|3|23-preAction

// write pre-action user code here

com.sun.lwuit.Display.init(this);

com.sun.lwuit.Form lwuitForm = new com.sun.lwuit.Form("LWUIT FORM");

lwuitForm.addComponent(new com.sun.lwuit.Label("Thi is a Lwuit Form."));

lwuitForm.addComponent(new com.sun.lwuit.Label("Press Lcdui Form Command to "));

lwuitForm.addComponent(new com.sun.lwuit.Label("switch to Lcdui Form."));

com.sun.lwuit.Command switchToLcduiFormCommand = new com.sun.lwuit.Command("Lcdui Form");

lwuitForm.addCommand(switchToLcduiFormCommand);

lwuitForm.addCommandListener(new com.sun.lwuit.events.ActionListener() {

public void actionPerformed(ActionEvent ae) {

if (ae.getCommand().getCommandName().equals("Lcdui Form")) {

lcduiDisplay.setCurrent(lcduiForm);

}

}

});

lwuitForm.show();

//GEN-LINE:|7-commandAction|4|23-postAction

// write post-action user code here

}//GEN-BEGIN:|7-commandAction|5|7-postCommandAction

}//GEN-END:|7-commandAction|5|7-postCommandAction

// write post-action user code here

}//GEN-BEGIN:|7-commandAction|6|

//</editor-fold>//GEN-END:|7-commandAction|6|

//<editor-fold defaultstate="collapsed" desc=" Generated Getter: exitCommand ">//GEN-BEGIN:|18-getter|0|18-preInit

/**

* Returns an initiliazed instance of exitCommand component.

* @return the initialized component instance

*/

public Command getExitCommand() {

if (exitCommand == null) {//GEN-END:|18-getter|0|18-preInit

// write pre-init user code here

exitCommand = new Command("Exit", Command.EXIT, 0);//GEN-LINE:|18-getter|1|18-postInit

// write post-init user code here

}//GEN-BEGIN:|18-getter|2|

return exitCommand;

}

//</editor-fold>//GEN-END:|18-getter|2|

//</editor-fold>

//<editor-fold defaultstate="collapsed" desc=" Generated Getter: lcduiForm ">//GEN-BEGIN:|14-getter|0|14-preInit

/**

* Returns an initiliazed instance of lcduiForm component.

* @return the initialized component instance

*/

public Form getLcduiForm() {

if (lcduiForm == null) {//GEN-END:|14-getter|0|14-preInit

// write pre-init user code here

lcduiForm = new Form("LCDUI Form", new Item[] { getStringItem() });//GEN-BEGIN:|14-getter|1|14-postInit

lcduiForm.addCommand(getExitCommand());

lcduiForm.addCommand(getSwitchToLwuitFormCommand());

lcduiForm.setCommandListener(this);//GEN-END:|14-getter|1|14-postInit

// write post-init user code here

}//GEN-BEGIN:|14-getter|2|

return lcduiForm;

}

//</editor-fold>//GEN-END:|14-getter|2|

//<editor-fold defaultstate="collapsed" desc=" Generated Getter: stringItem ">//GEN-BEGIN:|16-getter|0|16-preInit

/**

* Returns an initiliazed instance of stringItem component.

* @return the initialized component instance

*/

public StringItem getStringItem() {

if (stringItem == null) {//GEN-END:|16-getter|0|16-preInit

// write pre-init user code here

stringItem = new StringItem("This is a Lcdui Form", "Press Lwuit Form Command to switch to lwuit form");//GEN-LINE:|16-getter|1|16-postInit

// write post-init user code here

}//GEN-BEGIN:|16-getter|2|

return stringItem;

}

//</editor-fold>//GEN-END:|16-getter|2|

//</editor-fold>

//<editor-fold defaultstate="collapsed" desc=" Generated Getter: switchToLwuitFormCommand ">//GEN-BEGIN:|22-getter|0|22-preInit

/**

* Returns an initiliazed instance of switchToLwuitFormCommand component.

* @return the initialized component instance

*/

public Command getSwitchToLwuitFormCommand() {

if (switchToLwuitFormCommand == null) {//GEN-END:|22-getter|0|22-preInit

// write pre-init user code here

switchToLwuitFormCommand = new Command("LwuitForm", Command.OK, 0);//GEN-LINE:|22-getter|1|22-postInit

// write post-init user code here

}//GEN-BEGIN:|22-getter|2|

return switchToLwuitFormCommand;

}

//</editor-fold>//GEN-END:|22-getter|2|

/**

* Returns a display instance.

* @return the display instance.

*/

public Display getDisplay () {

return Display.getDisplay(this);

}

/**

* Exits MIDlet.

*/

public void exitMIDlet() {

switchDisplayable (null, null);

destroyApp(true);

notifyDestroyed();

}

/**

* Called when MIDlet is started.

* Checks whether the MIDlet have been already started and initialize/starts or resumes the MIDlet.

*/

public void startApp() {

if (midletPaused) {

resumeMIDlet ();

} else {

initialize ();

startMIDlet ();

}

midletPaused = false;

}

/**

* Called when MIDlet is paused.

*/

public void pauseApp() {

midletPaused = true;

}

/**

* Called to signal the MIDlet to terminate.

* @param unconditional if true, then the MIDlet has to be unconditionally terminated and all resources has to be released.

*/

public void destroyApp( boolean unconditional) {

}

}