LWUIT： TabbedPane的两个注意点。

 package com.mobiledelight.app;import java.io.IOException;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;import com.mobiledelight.app.sodino.events.LocalDirectoryListListener;import com.mobiledelight.app.sodino.view.LocalDirectoryList;import com.mobiledelight.app.util.ContainerCustom;import com.sun.lwuit.Button;import com.sun.lwuit.Container;import com.sun.lwuit.Display;import com.sun.lwuit.Form;import com.sun.lwuit.Label;import com.sun.lwuit.List;import com.sun.lwuit.TabbedPane;import com.sun.lwuit.events.ActionEvent;import com.sun.lwuit.events.ActionListener;import com.sun.lwuit.events.SelectionListener;import com.sun.lwuit.layouts.BorderLayout;import com.sun.lwuit.layouts.FlowLayout;import com.sun.lwuit.layouts.GridLayout;import com.sun.lwuit.list.DefaultListModel;import com.sun.lwuit.plaf.UIManager;import com.sun.lwuit.util.Resources;/**@author sodino */public class SodinoMIDlet extends MIDlet implements SelectionListener {private Form f;private TabbedPane tpBrowser;private Label lab1 = new Label("View1");private Label lab2 = new Label("View2");private Label lab3 = new Label("View3");private Label lab4 = new Label("View4");private int indexTab;public SodinoMIDlet() {Display.init(this);try {Resources r = Resources.open("/javaTheme.res");UIManager.getInstance().setThemeProps(r.getTheme("javaTheme"));} catch (IOException e) {e.printStackTrace();}f = new Form("SodinoTest");f.setLayout(new BorderLayout());indexTab = 0;}private void init() {tpBrowser = new TabbedPane();tpBrowser.addTab(lab1.getText(), lab1);tpBrowser.addTab(lab2.getText(), lab2);tpBrowser.addTab(lab3.getText(), lab3);tpBrowser.addTab(lab4.getText(), lab4);tpBrowser.addTabsListener(this);f.addComponent(BorderLayout.CENTER, tpBrowser);f.addComponent(BorderLayout.SOUTH, createButtonContainer());}protected void destroyApp(boolean arg0) throws MIDletStateChangeException {// TODO Auto-generated method stub}protected void pauseApp() {// TODO Auto-generated method stub}protected void startApp() throws MIDletStateChangeException {init();f.show();}public void selectionChanged(int oldIdx, int newIdx) {indexTab = newIdx;System.out.println("sodino indexTab = " + indexTab);}private Container createButtonContainer() {Container main = new Container(new GridLayout(2, 1));Container con1 = new Container(new FlowLayout());Button btn1 = new Button("Add V1");btn1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {if (tpBrowser.contains(lab1) == false) {tpBrowser.addTab(lab1.getText(), lab1);tpBrowser.setSelectedIndex(0);}}});con1.addComponent(btn1);Button btn2 = new Button("Add V2");btn2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {if (tpBrowser.contains(lab2) == false) {tpBrowser.addTab(lab2.getText(), lab2);tpBrowser.setSelectedIndex(0);}}});con1.addComponent(btn2);Button btn3 = new Button("Add V3");btn3.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {if (tpBrowser.contains(lab3) == false) {tpBrowser.addTab(lab3.getText(), lab3);tpBrowser.setSelectedIndex(0);}}});con1.addComponent(btn3);Button btn4 = new Button("Add V4");btn4.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {if (tpBrowser.contains(lab4) == false) {tpBrowser.addTab(lab4.getText(), lab4);tpBrowser.setSelectedIndex(0);}}});con1.addComponent(btn4);Container con2 = new Container(new FlowLayout());Button btn01 = new Button("Del A");btn01.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {tpBrowser.removeTabAt(0);tpBrowser.setSelectedIndex(0);}});con2.addComponent(btn01);Button btn02 = new Button("Del M");btn02.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {tpBrowser.removeTabAt(tpBrowser.getSelectedIndex());tpBrowser.setSelectedIndex(0);}});con2.addComponent(btn02);Button btn03 = new Button("Del Z");btn03.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {tpBrowser.removeTabAt(tpBrowser.getTabCount() - 1);tpBrowser.setSelectedIndex(0);}});con2.addComponent(btn03);main.addComponent(con1);main.addComponent(con2);return main;}}

 

TabbedPane在removeComponent()后，Tab被删除，直接调用selectionChange(ine old,int new).但是画面却仍是旧的画面。得通过设置selected Tab来进行更新。

 

本例中，当显示View1时，不能再增加View1了，却可以增加View2,3,4;当显示View2时，不能再增加View2了，却可以增加View1,3,4。

不明白这是为什么。