j2me学习笔记【8】——TextField的使用实例

下面的一个实例是TextField的使用实例，输入、提交并显示输入内容。

 

package mtk;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.lcdui.TextField;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class TextFieldCapture extends MIDlet implements CommandListener {private Display display;private Form mainForm;private final static Command CMD_SUBMIT=new Command("提交",Command.SCREEN,1);private final static Command CMD_EXIT=new Command("退出",Command.EXIT,1);private TextField textField;public TextFieldCapture() {display=Display.getDisplay(this);textField=new TextField("姓名:","",20,TextField.ANY);mainForm=new Form("请输入");mainForm.append(textField);mainForm.addCommand(CMD_SUBMIT);mainForm.addCommand(CMD_EXIT);mainForm.setCommandListener(this);}protected void destroyApp(boolean arg0){}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {display.setCurrent(mainForm);}public void commandAction(Command c, Displayable d) {if(c==CMD_EXIT){destroyApp(false);notifyDestroyed();}else{if(c==CMD_SUBMIT){textField.setString("你好,"+textField.getString());mainForm.removeCommand(CMD_SUBMIT);}}}}

 

下面的实例是TextField属性应用，利用其中的TextField.ANY|TextField.PASSWORD，使得输入字符隐藏起来。

package mtk;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.lcdui.TextField;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class HideText extends MIDlet implements CommandListener {private Display display;private Form mainForm;private final static Command SUBMIT=new Command("提交",Command.SCREEN,1);private final static Command CMD_EXIT=new Command("退出",Command.EXIT,1);private TextField textField;public HideText() {display=Display.getDisplay(this);textField=new TextField("密码","",20,TextField.ANY|TextField.PASSWORD);mainForm=new Form("请输入密码");mainForm.addCommand(CMD_EXIT);mainForm.addCommand(SUBMIT);mainForm.append(textField);mainForm.setCommandListener(this);}protected void destroyApp(boolean arg0){}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {display.setCurrent(mainForm);}public void commandAction(Command c, Displayable d) {if(c==CMD_EXIT){destroyApp(false);notifyDestroyed();}else{if(c==SUBMIT){textField.setConstraints(TextField.ANY);textField.setString("谢谢");mainForm.removeCommand(SUBMIT);}}}}