listcontrol.java

《精通JAVA手机游戏与应用程序设计》随书光盘

/**
 * 单选列表框的基础
 * The MIDlet demonstrates the different types of list supported by MIDP-2.0:
 *      EXCLUSIVE - a choice having exactly one element selected at time.
 *      IMPLICIT  - a choice in which the currently focused element is
 *                  selected when a Command is initiated.
 *      MULTIPLE  - a choice that can have arbitrary number of elements
 *                  selected at a time.
 *
 * @version 2.0
 */

import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
/**
 * @author long
 * 显示最普通的列表
 */
public class ListControl extends MIDlet {

	private List mainList;
	 private Display display;
	private boolean firstTime;
	public ListControl() {
		display = Display.getDisplay(this);
		firstTime = true;
	}

	protected void startApp()  {
		if (firstTime) {
            // these are the images and strings for the choices.
            Image[] imageArray = null;
    
            try {
                // load the duke image to place in the image array
                Image icon = Image.createImage("/Icon.png");
    
    
                // 注意，每个List选项都需要一个图标
                imageArray = new Image[] {
                    icon, 
                    icon, 
                    icon,
					icon
                };
            } catch (java.io.IOException err) {
                // ignore the image loading failure the application can recover.
            	System.out.print("load failed ...");
            }
    
            String[] stringArray = {
                "List 1", 
                "List 2", 
                "List 3",
				"List 4"
            };
            mainList = new List("Choose type", Choice.IMPLICIT, stringArray, 
                                imageArray);            
            display.setCurrent(mainList);
            firstTime = false;
        }		

	}

	protected void pauseApp() {		

	}

	protected void destroyApp(boolean arg0){
		
	}

}