Lwuit中关于TextField限制输入为数字的内容代码

Lwuit中关于TextField限制输入为数字的内容代码

在Lwuit中关于TextField的标签在前面已经接触过了，确实lwuit中的标签跟javax.microedition.midlet.*包中的标签有很大的区别。

比如这个TextFiled的区别：

1.在javax.microedition.midlet.*包中定义TextFiled并限制输入为数字：

TextField numberEntry = new TextField("Connect to:",null,256,TextField.PHONENUMBER);

在构造方法中就可以限制输入类型

2.在com.sun.lwuit.TextField包中定义TextFiled并限制输入为数字：

TextField tf = new TextField(TextArea.PHONENUMBER);
随然在构造方法中也可以限制输入类型，但似乎没起到作用

下面看一下关于Lwuit中TextField限制输入为数字的内容代码：

package com.mopietek;

import java.util.Hashtable;

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

import com.sun.lwuit.Display;
import com.sun.lwuit.Form;
import com.sun.lwuit.Label;
import com.sun.lwuit.TextArea;
import com.sun.lwuit.TextField;
import com.sun.lwuit.events.DataChangedListener;
import com.sun.lwuit.layouts.BorderLayout;

public class TextTest extends MIDlet{

	 TextField tf = null;
	protected void destroyApp(boolean unconditional)
			throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		
	}

	protected void pauseApp() {
		// TODO Auto-generated method stub
		
	}

	protected void startApp() throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		Display.init(this);
		
		Form f = new Form("ceshi");
		f.setLayout(new BorderLayout());
		tf = new TextField();
		final Label label = new Label("kong");
		
		Hashtable ht = new Hashtable();
		ht.put(new Integer('0'), "0");
		ht.put(new Integer('9'), "9");
		ht.put(new Integer('8'), "8");
		ht.put(new Integer('7'), "7");
		ht.put(new Integer('6'), "6");
		ht.put(new Integer('5'), "5");
		ht.put(new Integer('4'), "4");
		ht.put(new Integer('3'), "3");
		ht.put(new Integer('2'), "2");
		ht.put(new Integer('1'), "1");
		ht.put(new Integer('#'), "+");
		TextField.addInputMode("+123", ht, false);
		
		
		tf.setConstraint(TextArea.PHONENUMBER);
		
		//缺少这两句话就会报数组越界异常
		tf.setInputMode("+123");
		tf.setInputModeOrder(new String[]{"+123"});
		
		
		tf.addDataChangeListener(new DataChangedListener(){

			public void dataChanged(int i, int j) {
                
				if(i == DataChangedListener.ADDED){
					label.setText("ADDED");
					if(tf.getText().length()>5){
						tf.setText(tf.getText().substring(0,5));
					}
				}
				if(i == DataChangedListener.CHANGED){
					label.setText("CHANGED");
				}
				if(i == DataChangedListener.REMOVED){
					label.setText("REMOVED");
				}
			
			}
			
		});
         f.addComponent(BorderLayout.NORTH,tf);
         f.addComponent(BorderLayout.SOUTH,label);
         f.show();
         
		
	}
	
	

}