J2ME学习笔记_3

今天学习了给按钮增加事情和LIST

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增加事件方法1

package com.hoocy;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.Form;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class MIDlet3 extends MIDlet {private Form form = new Form("测试command命令");private Command cmd1 = new Command("测试按钮", Command.SCREEN, 1);private Display display;protected void startApp() throws MIDletStateChangeException {display = Display.getDisplay(this);display.setCurrent(form);form.addCommand(cmd1);form.setCommandListener(new Command1());}protected void destroyApp(boolean arg0) throws MIDletStateChangeException {// TODO Auto-generated method stub}protected void pauseApp() {// TODO Auto-generated method stub}}class Command1 implements CommandListener {public void commandAction(Command c, Displayable d) {System.out.println("我被点击了");System.out.println(c.getLabel());}}

?增加事件方法2

package com.hoocy;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.Form;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class MIDlet33 extends MIDlet implements CommandListener {private Display display;private Form form = new Form("title");private Command shanchu = new Command("删除", Command.SCREEN, 1);private Command genxin = new Command("更新", Command.SCREEN, 1);private Command bianji = new Command("编辑", Command.SCREEN, 1);private Command back = new Command("返回", Command.BACK, 1);public MIDlet33() {display = Display.getDisplay(this);display.setCurrent(form);form.addCommand(shanchu);form.addCommand(genxin);form.addCommand(bianji);form.addCommand(back);form.setCommandListener(this);}protected void destroyApp(boolean arg0) throws MIDletStateChangeException {}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {}public void commandAction(Command c, Displayable d) {if (c == shanchu || c == genxin) {form.append(c.getLabel());} else if (c == bianji) {form.setTitle(c.getLabel());} else if (c == back) {form.setTitle("BACK");}}}

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关于LIST

package com.hoocy;import java.io.IOException;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.Image;import javax.microedition.lcdui.List;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class MIDlet4 extends MIDlet implements CommandListener{private Display display;private List list = new List("请选择相应的操作", List.IMPLICIT);public MIDlet4() throws IOException {display = Display.getDisplay(this);display.setCurrent(list);list.append("选项一", null);list.append("选项二", null);list.append("选项三", null);Command cmdOk = new Command("确定", Command.OK, 1);list.addCommand(cmdOk);list.setCommandListener(this);}protected void destroyApp(boolean arg0) throws MIDletStateChangeException {}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {}public void commandAction(Command c, Displayable d) {int index= list.getSelectedIndex();System.out.println(index);}}

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?list? 单选类型2? EXCLUSIVE

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package com.hoocy;import java.io.IOException;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.Image;import javax.microedition.lcdui.List;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class MIDlet5 extends MIDlet implements CommandListener{private Display display;private List list = new List("请选择相应的操作", List.EXCLUSIVE);public MIDlet5() throws IOException {display = Display.getDisplay(this);display.setCurrent(list);list.append("选项一", null);list.append("选项二", null);list.append("选项三", null);Command cmdOk = new Command("确定", Command.OK, 1);list.addCommand(cmdOk);list.setCommandListener(this);}protected void destroyApp(boolean arg0) throws MIDletStateChangeException {}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {}public void commandAction(Command c, Displayable d) {int index= list.getSelectedIndex();System.out.println(index);}}

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list---多选

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package com.hoocy;import java.io.IOException;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.List;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class MIDlet6 extends MIDlet implements CommandListener{private Display display;private List list = new List("请选择相应的操作", List.MULTIPLE);public MIDlet6() throws IOException {display = Display.getDisplay(this);display.setCurrent(list);list.append("选项一", null);list.append("选项二", null);list.append("选项三", null);Command cmdOk = new Command("确定", Command.OK, 1);list.addCommand(cmdOk);list.setCommandListener(this);}protected void destroyApp(boolean arg0) throws MIDletStateChangeException {}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {}public void commandAction(Command c, Displayable d) {//对于多选取值，有两种方法//方法1//int size = list.size();//for (int i = 0; i < size; i++) {//if(list.isSelected(i))//{//System.out.println(list.getSelectedIndex()+"----"+list.getString(i));//}//}//方法2int size = list.size();boolean[] flag = new boolean[size];list.getSelectedFlags(flag);for (int i = 0; i < flag.length; i++) {if(flag[i]){System.out.println(list.getString(i));}}}}