private void buildUI() throws Exception {
try {
Display.init(this);
countryLabel = new Label(resources.getString("Label10"));
countryLabel.setSelectedStyle(DefaultLayout.labelStyle());
countryLabel.setPressedStyle(DefaultLayout.labelStyle());
countryLabel.setUnselectedStyle(DefaultLayout.labelStyle());
country = new ComboBox(countryChoiceDesc);
country.setSelectedStyle(DefaultLayout.comboBoxPressedStyle());
country.setUnselectedStyle(DefaultLayout.comboBoxNormalStyle());
country.setPressedStyle(DefaultLayout.comboBoxPressedStyle());
CountryListener countryListener = new CountryListener();
country.addSelectionListener(countryListener);
townLabel = new Label(resources.getString("Label12"));
townLabel.setSelectedStyle(DefaultLayout.labelStyle());
townLabel.setPressedStyle(DefaultLayout.labelStyle());
townLabel.setUnselectedStyle(DefaultLayout.labelStyle());
// townList = new List(townChoiceDesc);
// townModel = townList.getModel();
//
// town = new ComboBox(townModel);
town = new ComboBox(townChoiceDesc);
town.setSelectedStyle(DefaultLayout.comboBoxPressedStyle());
town.setUnselectedStyle(DefaultLayout.comboBoxNormalStyle());
town.setPressedStyle(DefaultLayout.comboBoxPressedStyle());
townListener townListener = new townListener();
town.addSelectionListener(townListener);
districtLabel = new Label(resources.getString("Label13"));
districtLabel.setSelectedStyle(DefaultLayout.labelStyle());
districtLabel.setPressedStyle(DefaultLayout.labelStyle());
districtLabel.setUnselectedStyle(DefaultLayout.labelStyle());
// districtList = new List(districtChoiceDesc);
// districtModel = districtList.getModel();
// district = new ComboBox(districtModel);
district = new ComboBox(districtChoiceDesc);
district.setSelectedStyle(DefaultLayout.comboBoxPressedStyle());
district.setUnselectedStyle(DefaultLayout.comboBoxNormalStyle());
district.setPressedStyle(DefaultLayout.comboBoxPressedStyle());
cityLabel = new Label(resources.getString("Label11"));
cityLabel.setSelectedStyle(DefaultLayout.labelStyle());
cityLabel.setPressedStyle(DefaultLayout.labelStyle());
cityLabel.setUnselectedStyle(DefaultLayout.labelStyle());
}catch (Exception e) {
System.out.println("build ui"+e.getMessage());
dialog = DefaultLayout.validation(AppConstants.exceptionMsg);
dialog.show();
}
}
class CountryListener implements SelectionListener {
public void selectionChanged(int arg0, int arg1) {
try {
// Dialog.show("Beno","country action", "Ok", null);
countryValue = countryChoice[country.getSelectedIndex()];
getCity(countryValue);
System.out.println("cityChoiceDesc.length :"+cityChoiceDesc.length);
if (cityChoiceDesc.length > 0) {
// System.out.println("city set");
cityList = new List(cityChoiceDesc);
ListModel cityModel = cityList.getModel();
city.setModel(cityModel);
}
else {
String citylist[] = {};
List list = new List(citylist);
ListModel citylistModel = list.getModel();
city.setModel(citylistModel);
String townlist[] = {};
List list1 = new List(townlist);
ListModel townlistModel = list1.getModel();
town.setModel(townlistModel);
String districtlist[] = {};
List list2 = new List(districtlist);
ListModel districtlistModel = list2.getModel();
district.setModel(districtlistModel);
}
} catch (Exception e) {
try {
dialog = DefaultLayout.validation(AppConstants.exceptionMsg);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
dialog.show();
}
}
}
class CityListener implements SelectionListener {
public void selectionChanged(int arg0, int arg1) {
try {
cityValue = cityChoice[city.getSelectedIndex()];
// city.setSelectedIndex(city.getSelectedIndex());
getTown(cityValue);
if (townChoiceDesc.length > 0) {
List list = new List(townChoiceDesc);
ListModel listModel = list.getModel();
town.setModel(listModel);
} else {
String townlist[] = {};
List list1 = new List(townlist);
ListModel townlistModel = list1.getModel();
town.setModel(townlistModel);
String districtlist[] = {};
List list2 = new List(districtlist);
ListModel districtlistModel = list2.getModel();
district.setModel(districtlistModel);
}
} catch (Exception e) {
try {
dialog = DefaultLayout.validation(AppConstants.exceptionMsg);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
dialog.show();
}
}
class townListener implements SelectionListener {
public void selectionChanged(int arg0, int arg1) {
System.out.println("town list");
townValue = townChoice[town.getSelectedIndex()];
try {
getDistrict(townValue);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (districtChoiceDesc.length > 0) {
List list = new List(districtChoiceDesc);
ListModel listModel = list.getModel();
district.setModel(listModel);
} else {
String districtlist[] = {};
List list2 = new List(districtlist);
ListModel districtlistModel = list2.getModel();
district.setModel(districtlistModel);
}
}
}
在选择国家时，它会调用城市监听器，但城市监听器未调用，但相应的值会在城市中更新。选择城市组合时，它并没有打电话给城镇听众，为什么有人帮助我。即使我选择城市组合框中的值，它也不会显示所选项目
答案 0 :(得分：1)
您应该将动作侦听器与组合框一起使用而不是选择侦听器。不要创建新列表，只需在现有列表中使用setModel（）。