Mega Code Archive
Add or remove controls from a form
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import java.io.IOException;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
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.Image;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.TextField;
import javax.microedition.lcdui.Ticker;
import javax.microedition.midlet.MIDlet;
public class MIDPApplication extends MIDlet implements CommandListener {
Ticker newsTicker = new Ticker("Java J2ME");
private List menuList = new List(null, List.IMPLICIT, menuItem, menuImage);
private List luckyList;
private List commList;
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
private Command execCommand = new Command("Exe", Command.OK, 1);
private Command menuCommand = new Command("Main", Command.SCREEN, 1);
private Command commCommand = new Command("Contact", Command.SCREEN, 1);
private Command luckyCommand = new Command("Plan", Command.SCREEN, 1);
private Command saveCommand;
String[] menuItem = { "Contact", "Plan" };
String[] commItem = { "Add", "Search", "Edit", "Delete" };
String[] luckyItem = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L" };
Image[] menuImage = { createImage("/S.png"), createImage("/T.png") };
private Display display = Display.getDisplay(this);
private String currentScreen = "";
public void startApp() {
menuList.setTicker(newsTicker);
menuList.addCommand(exitCommand);
menuList.setCommandListener(this);
display.setCurrent(menuList);
currentScreen = "Main";
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == exitCommand) {
destroyApp(false);
notifyDestroyed();
}
if (c == List.SELECT_COMMAND) {
if (currentScreen == "Main") {
int itemIndex = menuList.getSelectedIndex();
switch (itemIndex) {
case 0: {
doCommunication();
break;
}
case 1:
doLucky();
}
} else if (currentScreen == "Contact") {
int itemIndex = commList.getSelectedIndex();
switch (itemIndex) {
case 0: {
doAppend();
break;
}
case 1: {
doQuery();
break;
}
case 2: {
doModification();
break;
}
case 3: {
doDelete();
break;
}
} else {
}
}
if (c == menuCommand) {
display.setCurrent(menuList);
currentScreen = "Main";
}
if (c == commCommand) {
doCommunication();
}
if (c == luckyCommand) {
doLucky();
}
if (c == menuCommand) {
doMenu();
}
if (c == execCommand) {
if (currentScreen == "Plan") {
showLucky();
}
}
}
private Image createImage(String name) {
Image aImage = null;
try {
aImage = Image.createImage(name);
} catch (IOException e) {
}
return aImage;
}
private void doMenu() {
currentScreen = "Main";
display.setCurrent(menuList);
}
private void doCommunication() {
Image[] commIcon = { createImage("/S.png"), createImage("/Sk.png"),
createImage("/M.png"), createImage("/T.png") };
commList = new List("Contact", List.IMPLICIT, commItem, commIcon);
commList.addCommand(luckyCommand);
commList.addCommand(menuCommand);
commList.setCommandListener(this);
currentScreen = "Contact";
display.setCurrent(commList);
}
private void doLucky() {
luckyList = new List("Plan", List.EXCLUSIVE, luckyItem, null);
luckyList.addCommand(commCommand);
luckyList.addCommand(menuCommand);
luckyList.addCommand(execCommand);
luckyList.setCommandListener(this);
currentScreen = "Plan";
display.setCurrent(luckyList);
}
private void showLucky() {
int selectedItem = luckyList.getSelectedIndex();
Alert alert;
String information = "";
switch (selectedItem) {
case 0: {
information = "A";
break;
}
case 1: {
information = "B";
break;
}
case 2: {
information = "C";
break;
}
case 3: {
information = "D";
break;
}
case 4: {
information = "E";
break;
}
case 5: {
information = "F";
break;
}
case 6: {
information = "G";
break;
}
case 7: {
information = "H";
break;
}
case 8: {
information = "I";
break;
}
case 9: {
information = "J";
break;
}
case 10: {
information = "K";
break;
}
case 11: {
information = "L";
break;
}
alert = new Alert("Info", information, null, AlertType.INFO);
alert.setTimeout(Alert.FOREVER);
display.setCurrent(alert);
}
private void doAppend() {
Form appendForm = new Form("Add");
saveCommand = new Command("Save", Command.SCREEN, 1);
TextField nameField = new TextField("Name", null, 10, TextField.ANY);
TextField EMailField = new TextField("E Mail", null, 10, TextField.EMAILADDR);
TextField ageField = new TextField("Age", null, 10, TextField.NUMERIC);
appendForm.append(nameField);
appendForm.append(EMailField);
appendForm.append(ageField);
appendForm.addCommand(saveCommand);
appendForm.addCommand(commCommand);
appendForm.addCommand(luckyCommand);
appendForm.setCommandListener(this);
currentScreen = "ContactAdd";
display.setCurrent(appendForm);
}
private void doModification() {
Form modificationForm = new Form("Edit");
TextField nameField = new TextField("Name", null, 10, TextField.ANY);
modificationForm.append(nameField);
modificationForm.addCommand(execCommand);
modificationForm.addCommand(commCommand);
modificationForm.addCommand(luckyCommand);
modificationForm.setCommandListener(this);
currentScreen = "ContactEdit";
display.setCurrent(modificationForm);
}
private void doQuery() {
Form queryForm = new Form("Search");
TextField nameField = new TextField("Name", null, 10, TextField.ANY);
queryForm.append(nameField);
queryForm.addCommand(execCommand);
queryForm.addCommand(commCommand);
queryForm.addCommand(luckyCommand);
queryForm.setCommandListener(this);
currentScreen = "ContactSearch";
display.setCurrent(queryForm);
}
private void doDelete() {
Form deleteForm = new Form("Delete");
TextField nameField = new TextField("Name", null, 10, TextField.ANY);
deleteForm.append(nameField);
deleteForm.addCommand(execCommand);
deleteForm.addCommand(commCommand);
deleteForm.addCommand(luckyCommand);
deleteForm.setCommandListener(this);
currentScreen = "ContactDelete";
display.setCurrent(deleteForm);
}
}
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