lists, forms, choices, gauges, text fields, text boxes in J2ME
By: Eric Giguere Printer Friendly Format
This example demonstrates how to create various GUI components. The MIDlet for this example allows you to test lists, forms, choices, gauges, text fields, text boxes, for example.
import javax.microedition.lcdui.*; import javax.microedition.midlet.*; public class GuiTests extends MIDlet implements CommandListener { // display manager Display display = null; // a menu with items List menu = null; // main menu // list of choices List choose = null; // textbox TextBox input = null; // ticker Ticker ticker = new Ticker("Test GUI Components"); // alerts final Alert soundAlert = new Alert("sound Alert"); // date DateField date = new DateField("Today's date: ", DateField.DATE); // form Form form = new Form("Form for Stuff"); // gauge Gauge gauge = new Gauge("Gauge Label", true, 10, 0); // text field TextField textfield = new TextField("TextField Label", "abc", 50, 0); // command static final Command backCommand = new Command("Back", Command.BACK, 0); static final Command mainMenuCommand = new Command("Main", Command.SCREEN, 1); static final Command exitCommand = new Command("Exit", Command.STOP, 2); String currentMenu = null; // constructor. public GuiTests() { } /** * Start the MIDlet by creating a list of items and associating the * exit command with it. */ public void startApp() throws MIDletStateChangeException { display = Display.getDisplay(this); // open a db stock file menu = new List("Test Components", Choice.IMPLICIT); menu.append("Test TextBox", null); menu.append("Test List", null); menu.append("Test Alert", null); menu.append("Test Date", null); menu.append("Test Form", null); menu.addCommand(exitCommand); menu.setCommandListener(this); menu.setTicker(ticker); mainMenu(); } public void pauseApp() { display = null; choose = null; menu = null; ticker = null; form = null; input = null; gauge = null; textfield = null; } public void destroyApp(boolean unconditional) { notifyDestroyed(); } // main menu void mainMenu() { display.setCurrent(menu); currentMenu = "Main"; } /** * Test the TextBox component. */ public void testTextBox() { System.out.println("textbox called"); input = new TextBox("Enter Some Text:", "", 5, TextField.ANY); input.setTicker(new Ticker("testTextBox")); input.addCommand(backCommand); input.setCommandListener(this); input.setString(""); display.setCurrent(input); currentMenu = "input"; } /** * Test the List component. */ public void testList() { choose = new List("Choose Items", Choice.MULTIPLE); choose.setTicker(new Ticker("listTest")); choose.addCommand(backCommand); choose.setCommandListener(this); choose.append("Item 1", null); choose.append("Item 2", null); choose.append("Item 3", null); display.setCurrent(choose); currentMenu = "list"; } /** * Test the Alert component. */ public void testAlert() { soundAlert.setType(AlertType.ERROR); soundAlert.setString("** ERROR **"); display.setCurrent(soundAlert); } /** * Test the DateField component. */ public void testDate() { java.util.Date now = new java.util.Date(); date.setDate(now); Form f = new Form("Today's date"); f.append(date); f.addCommand(backCommand); f.setCommandListener(this); display.setCurrent(f); currentMenu = "date"; } /** * Test the Form component. */ public void testForm() { form.append(gauge); form.append(textfield); form.addCommand(backCommand); form.setCommandListener(this); display.setCurrent(form); currentMenu = "form"; } /** * Handle events. */ public void commandAction(Command c, Displayable d) { String label = c.getLabel(); if (label.equals("Exit")) { destroyApp(true); } else if (label.equals("Back")) { if(currentMenu.equals("list") || currentMenu.equals("input") || currentMenu.equals("date") || currentMenu.equals("form")) { // go back to menu mainMenu(); } } else { List down = (List)display.getCurrent(); switch(down.getSelectedIndex()) { case 0: testTextBox();break; case 1: testList();break; case 2: testAlert();break; case 3: testDate();break; case 4: testForm();break; } } } }
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Archived Comments
1. Great examples Eric! Really helped me out a lot, m
View Tutorial By: Markus at 2008-11-12 05:27:05
2. This is great! this is a big help for my studies!
View Tutorial By: cAmfy at 2012-10-13 06:09:48
3. abasasasasas
View Tutorial By: abac at 2009-07-01 00:36:34
4. Thank you so much Eric Giguere.
You save me
View Tutorial By: ijAcK D at 2009-10-18 05:02:48
5. hi Eric Giguere,
You brilliantly co
View Tutorial By: danger guy at 2010-01-03 12:08:12
6. U r real cheaters...Copying something as their own
View Tutorial By: HiBoy at 2010-01-05 02:30:13
7. really nice article
View Tutorial By: fir at 2010-01-05 02:32:16
8. Great works! Pls I want to create a j2me mobile me
View Tutorial By: Chris at 2012-05-16 22:18:54
9. please i need to code an application in which you
View Tutorial By: eya at 2014-11-06 14:15:50