itemcommanddemo.java

来自「jBuilderX无线应用开发源代码」· Java 代码 · 共 50 行

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

public class ItemCommandDemo extends MIDlet implements ItemCommandListener
{
	private Display display;
	private TextField tf1,tf2;
	private final Command copy=new Command("Copy", Command.ITEM, 1);
	private final Command clear=new Command("Clear", Command.ITEM, 1);

	public void startApp(){		
		Form form=new Form("ItemCommandDemo");
		//创建TextField，添加2个命令
		tf1=new TextField("text1","",12,TextField.ANY);
		tf1.addCommand(copy);
		tf1.addCommand(clear);
		tf1.setItemCommandListener(this);
		//创建TextField，添加1个命令
		tf2=new TextField("text2","",12,TextField.ANY);
		tf2.addCommand(copy);
		tf2.setItemCommandListener(this);
		//把上面创建的TextField添加到Form中显示
		form.append(tf1);
		form.append(tf2);
		display=Display.getDisplay(this);
		display.setCurrent(form);
	}

	public void pauseApp(){
	}

	public void destroyApp(boolean unconditional){
	}

	public void commandAction(Command c, Item item){
		TextField tf=(TextField)item;
		if(c == clear){
			//清除tf1的内容
			tf1.setString("");
		}
		if(c == copy && item == tf1){
			//把tf1的内容复制到tf2
			tf2.setString(tf1.getString());
		}
		if(c == copy && item == tf2){
			//把tf2的内容复制到tf1
			tf1.setString(tf2.getString());
		}
	}
}