listtest.java

《精彩的手机UI例程.zip》是很好的手机编辑软件

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

public class ListTest extends MIDlet implements CommandListener{
	private List menu;
	private List implicit_list;
	private List exclusive_list;
	private List multiple_list;
	private Command okCommand = new Command("OK", Command.OK, 1);
	private Command backCommand = new Command("Back", Command.BACK, 1);
	private String[] options={"Option A","Option B","Option C"};	
	private Display display;
	
    public ListTest() {
    	//create an implicit choice list, and use it as start menu
		menu= new List("Choose demo", List.IMPLICIT);
		menu.append("Implicit choice list",null);
		menu.append("Multiple choice list",null);
		menu.insert(1, "Exclusive choice list",null);
		menu.append("Exit",null);
		menu.setCommandListener(this);
		
		//create an implicit list
		implicit_list= new List("Implicit-choice list",List.IMPLICIT,
								 options, null);
	    /**
	     *  Add an empty command to present commands in the same
	     *  layout as the rest.
	     */
		//implicit_list.addCommand(okCommand);
		implicit_list.addCommand(backCommand);
		implicit_list.setCommandListener(this);
		
		//create an exclusive list
		exclusive_list= new List("Exclusive-choice list",List.EXCLUSIVE,
								 options, null);
		exclusive_list.addCommand(okCommand);
		exclusive_list.addCommand(backCommand);
		exclusive_list.setCommandListener(this);

		//create a mutiple choice list		
		multiple_list= new List("Multiple-choice list",List.MULTIPLE,
								 options, null);
		multiple_list.addCommand(okCommand);
		multiple_list.addCommand(backCommand);
		multiple_list.setCommandListener(this);
		
		
		display=Display.getDisplay(this);
	}
    public void startApp() throws MIDletStateChangeException {
        display.setCurrent(menu);
    }

    /**
     * Pause the MIDlet
     */
    public void pauseApp() {
    }

    /**
     * Called by the framework before the application is unloaded
     */
    public void destroyApp(boolean unconditional) {
        //clear everything
        menu=null;
	implicit_list=null;
	exclusive_list=null;
	multiple_list=null;
	okCommand = null;
	backCommand = null;
	display=null;
    }

    public void commandAction(Command c, Displayable d) {
	if(d==menu && c==List.SELECT_COMMAND) {
	    switch(menu.getSelectedIndex()) {
	    case 0: //implicit choice list
		display.setCurrent(implicit_list);
	        break;
	    case 1: //exclusive choice list
		display.setCurrent(exclusive_list);
		break;
	    case 2: //multiple choice list
		display.setCurrent(multiple_list);
		break;
	    case 3: //exit
		destroyApp(true);
		notifyDestroyed();
		break;
	    default:
	    }
	}
	else if(d==implicit_list && c==List.SELECT_COMMAND) {
	    System.out.println(options[((List)d).getSelectedIndex()]+" is selected");
	}
	else if(d==exclusive_list && c==okCommand) {
	    System.out.println(options[((List)d).getSelectedIndex()]+" is selected");
	}
	else if(d==multiple_list && c==okCommand) {
	    //report which options are selected
	    boolean[] selected= new boolean[options.length];
	    ((List)d).getSelectedFlags(selected);
	    for(int i=0; i<options.length; i++) {
		if(selected[i]) {
		    System.out.println(options[i]+" is selected");
		}
	    }
	}
	else if(c==backCommand) {
	    display.setCurrent(menu);
	}
    }
}