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POLWUIT: Need help `Back` command is not working properly
 

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  1. POLWUIT: Need help `Back` command is not working properly
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    <p>We show a <em>SPLASH</em> screen using form which is followed with <em>MENU</em> form that holds many buttons like about-us, login, feedback etc. Now I move to <code>LOGIN</code> form that holds <code>menu</code> and <code>back</code> commands. My problem is when the <code>back</code> command is clicked in this form it goes to <code>SPLASH</code> screen.</p> <p>The expected behavior is the back command in <code>LOGIN</code> form must go back to <code>MENU</code> form and not <code>SPLASH</code> form.</p> <p>How to do this? </p> <p><strong>Splash.java</strong></p> <pre><code>public class Splash extends MIDlet implements ActionListener { Image img_Splash; Form frm_Main; String str_URL; int Width, Height; Label lbl_Splash; Command cmd_Cancel; public void startApp() { Display.init(this); frm_Main = new Form(); try { //Resources theme = Resources.open("/44444.res"); img_Splash = Image.createImage("/res/splash.png"); Resources theme = Resources.open("/666666.res"); UIManager.getInstance().setThemeProps( theme.getTheme(theme.getThemeResourceNames()[0])); } catch (IOException io) { io.printStackTrace(); Dialog.show("Theme Exception", io.getMessage(), "Ok", null); } lbl_Splash = new Label(img_Splash); lbl_Splash.getStyle().setBgColor(16777215); frm_Main.addComponent(lbl_Splash); frm_Main.setScrollable(true); cmd_Cancel = new Command("Cancel"); frm_Main.addCommand(cmd_Cancel); frm_Main.addCommandListener(this); frm_Main.show(); // th Thread splashThread = new Thread() { public void run() { try { sleep(5000); } catch (InterruptedException ex) { ex.printStackTrace(); } finally { MainMenu mainmenu = new MainMenu(frm_Main); mainmenu.show(); } } }; splashThread.start(); } public void pauseApp() { } public void destroyApp(boolean unconditional) { //notifyDestroyed(); } public void actionPerformed(ActionEvent ae) { Command con = ae.getCommand(); String str_CmdName = con.getCommandName(); if (str_CmdName.equals("Cancel")) { notifyDestroyed(); } } } </code></pre> <p><strong>Mainmenu.java</strong></p> <pre><code>class MainMenu extends Form implements ActionListener { Form frm_Main; //MainMidlet main; public Button btn_main_Login, btn_main_NewUser, btn_main_Help; public Label lbl_main_Login, lbl_main_NewUser, lbl_main_Help; public Image img_main_Login, img_main_NewUser, img_main_Help; public Command cmd_Exit, cmd_Select; public MainMenu(Form form) { this.frm_Main = form; try { img_main_Login = Image.createImage("/res/btn_main_login.png"); img_main_NewUser = Image.createImage("/res/btn_main_newuser.png"); img_main_Help = Image.createImage("/res/btn_main_help.png"); } catch (IOException io) { io.printStackTrace(); //Dialog.show("Image not Found!", io.getMessage(), "Ok", null); System.out.println("Image not found" + io.getMessage()); } //--------- Whole form define as BorderLayout with three Container. BorderLayout bor_MainMenuLayout = new BorderLayout(); setLayout(bor_MainMenuLayout); setScrollable(false); //----------- Define Container for Header On North Container con_Header = new Container(); lbl_Header = new Label(img_Header); con_Header.addComponent(lbl_Header); //----------- Define Container as GridLayout and place //----------- on BorderLayout Center position //--------- Define Container(CENTER) for search details //--------- with BoxLayout BoxLayout bx_CenterLayout = new BoxLayout(BoxLayout.Y_AXIS); Container con_Center = new Container(bx_CenterLayout); con_Center.setScrollableY(true); con_Center.getStyle().setPadding(0, 10, 3, 3); //--------- FlowLayout for Header Details FlowLayout flw_MenuHdr = new FlowLayout(); Container con_HdrDetails = new Container(flw_MenuHdr); lbl_MenuHdr = new Label("Menu"); lbl_MenuHdr.getStyle().setBgTransparency(0); lbl_MenuHdr.getStyle().setPadding(0, 5, 10, 0); con_HdrDetails.addComponent(lbl_MenuHdr); con_Center.addComponent(con_HdrDetails); //---------- GridLayout define 1 rows and 3 coloumn //---------- First row GridLayout grd_Row1Layout = new GridLayout(1, 3); Container con_Row1Layout = new Container(grd_Row1Layout); btn_main_Login = new Button(img_main_Login); btn_main_Help = new Button(img_main_Help; btn_main_NewUser = new Button(img_main_NewUser); con_Row1Layout.addComponent(btn_main_Login); con_Row1Layout.addComponent(btn_main_Help); con_Row1Layout.addComponent(btn_main_NewUser); con_Center.addComponent(con_Row1Layout); //----------- Add Command on softkey cmd_Exit = new Command("Exit"); cmd_Select = new Command("Select"); addCommand(cmd_Select); addCommand(cmd_Exit); addCommandListener(this); addComponent(BorderLayout.NORTH, con_Header); addComponent(BorderLayout.CENTER, con_Center); //this.getStyle().setBgColor(12105912); frm_Main.getStyle().setBgColor(12105912); } public void actionPerformed(ActionEvent ae) { Command cmd = ae.getCommand(); String str_CmdName = cmd.getCommandName(); //----------- When Click on Exit Button if (str_CmdName.equals("Exit")) { //System.exit(0); //frm_Main.notifyAll(); } //----------- When Click on Select Button if (str_CmdName.equals("Select")) { //----------- When Click on Login if (btn_main_Login.hasFocus()) { String str_MemberId = GlobalClass.getInstance().getMemberId(); if (!(str_MemberId == "" || str_MemberId == null)) { SearchDiamond searchdiamond = new SearchDiamond(frm_Main); searchdiamond.setTransitionInAnimator( Transition3D.createRotation(800, true)); searchdiamond.show(); } else { Login login = new Login(frm_Main); login.setTransitionInAnimator( Transition3D.createRotation(800, true)); login.show(); } } //----------- When Click on New User if (btn_main_NewUser.hasFocus()) { //Dialog.show("New User", "NewUser", "Ok", null); NewUser newuser = new NewUser(frm_Main); //newuser.setTransitionInAnimator( CommonTransitions.createFade(1500)); newuser.setTransitionInAnimator( Transition3D.createRotation(800, true)); newuser.show(); } //----------- When Click on Help if (btn_main_Help.hasFocus()) { Help help = new Help(frm_Main); help.setTransitionInAnimator( Transition3D.createRotation(800, true)); help.show(); } //----------- When Click on Exit if (btn_main_Exit.hasFocus()) { System.exit(0); } } } } </code></pre> <p><strong>Login.java</strong></p> <pre><code>class Login extends Form implements ActionListener { Form frm_Main; Label lbl_Header, lbl_Footer, lbl_SepLine, lbl_HdrAlreadyMember, lbl_UserID, lbl_PWD, lbl_Blank2, lbl_Blank3, lbl_HdrNewMember, lbl_Info; TextField txtf_UserID, txtf_PWD; Button btn_Login; Command cmd_Back, cmd_AboutUs, cmd_Privacy; public Login(Form form) { this.frm_Main = form; //--------- Whole form define as BorderLayout with three Container. BorderLayout bor_LoginLayout = new BorderLayout(); setLayout(bor_LoginLayout); setScrollable(false); //--------- Define Container(NORTH) for Header. Container con_Header = new Container(); lbl_Header = new Label(); con_Header.addComponent(lbl_Header); //--------- Define Container(CENTER) for search details //--------- with BoxLayout BoxLayout bx_CenterLayout = new BoxLayout(BoxLayout.Y_AXIS); Container con_Center = new Container(bx_CenterLayout); con_Center.setScrollableY(true); con_Center.getStyle().setMargin(5, 5, 0, 0); //--------- FlowLayout for Header Details FlowLayout flw_HdrLayout = new FlowLayout(); Container con_HdrDetails = new Container(flw_HdrLayout); lbl_HdrAlreadyMember = new Label("Already a Member?"); lbl_HdrAlreadyMember.setAlignment(Component.LEFT); con_HdrDetails.addComponent(lbl_HdrAlreadyMember); con_Center.addComponent(con_HdrDetails); //--------- BoxLayout for Login details BoxLayout bx_Login1Layout = new BoxLayout(BoxLayout.Y_AXIS); Container con_Login1Details = new Container(bx_Login1Layout); con_Login1Details.setScrollableY(true); lbl_UserID = new Label("User Name:"); txtf_UserID = new TextField(""); txtf_UserID.setFocusable(true); txtf_UserID.setFocus(true); txtf_UserID.setConstraint(TextField.ANY); txtf_UserID.setInputMode("abc"); lbl_PWD = new Label("Password:"); txtf_PWD = new TextField(""); txtf_PWD.setConstraint(TextField.PASSWORD); con_Login1Details.addComponent(lbl_UserID); con_Login1Details.addComponent(txtf_UserID); con_Login1Details.addComponent(lbl_PWD); con_Login1Details.addComponent(txtf_PWD); //--------- BoxLayout for Login Button FlowLayout flw_LoginBtnLayout = new FlowLayout(CENTER); Container con_LoginBtnDetails = new Container( flw_LoginBtnLayout); con_LoginBtnDetails.setScrollableY(true); btn_Login = new Button("Login"); btn_Login.setPreferredSize(new Dimension(80, 25)); btn_Login.setAlignment(Component.CENTER); con_LoginBtnDetails.addComponent(btn_Login); con_Login1Details.addComponent(con_LoginBtnDetails); con_Center.addComponent(con_Login1Details); //--------- BoxLayout for other Login details BoxLayout bx_Login2Layout = new BoxLayout(BoxLayout.Y_AXIS); Container con_Login2Details = new Container(bx_Login2Layout); con_Login2Details.setScrollableY(true); con_Login2Details.getStyle().setMargin(5, 5, 10, 10); //--------- Login type 3 New Remember Me chk_RememberMe = new CheckBox("Remember Me"); chk_RememberMe.setTickerEnabled(false); con_Login2Details.addComponent(chk_RememberMe); //--------- Login type 3 New Forgot Password btn_ForgotPWD = new Button("Forgot Password?"); btn_ForgotPWD.setTickerEnabled(false); btn_ForgotPWD.setAlignment(Component.LEFT); btn_ForgotPWD.setTextPosition(Component.RIGHT); con_Login2Details.addComponent(btn_ForgotPWD); con_Center.addComponent(con_Login2Details); con_Center.getStyle().setPadding(0, 0, 10, 10); addComponent(BorderLayout.NORTH, con_Header); addComponent(BorderLayout.CENTER, con_Center); cmd_Back = new Command("Back"); this.setBackCommand(cmd_Back); addCommand(cmd_Back); addCommandListener(this); //---------- Add More Command for Menu item cmd_AboutUs = new Command("About Us"); cmd_Privacy = new Command("Privacy"); addCommand(cmd_AboutUs); addCommand(cmd_Privacy); //------- When Login Button is Clicked btn_Login.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { .... } }); } public void actionPerformed(ActionEvent ae) { Command con = ae.getCommand(); String str_CmdName = con.getCommandName(); if (str_CmdName.equals("Back")) { // here back code frm_Main.setTransitionInAnimator( Transition3D.createRotation(800, true)); frm_Main.showBack(); } .... if (str_CmdName.equals("About Us")) { AboutUs aboutus = new AboutUs(frm_Main); aboutus.show(); } if (str_CmdName.equals("Privacy")) { Privacy privacy = new Privacy(frm_Main); privacy.show(); } } } </code></pre> <p><strong>EDIT:</strong> Added the form's source code</p>
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    1. USVimal
    1. USHarshada Dhamapurkar
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      1. POLWUIT: Need help `Back` command is not working properly
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      1. POLWUIT: Need help `Back` command is not working properly
      1. This table or related slice is empty.
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    1. COThere are lot of unknown's and scenarios that can cause this problem ? Please provide your code snippet to acquire more help ?
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      1. POLWUIT: Need help `Back` command is not working properly
      1. USVimal
    2. COthanks for replay, i added some code here! plz help me
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      1. POLWUIT: Need help `Back` command is not working properly
      1. USHarshada Dhamapurkar
    3. COI have edited [my answer](http://stackoverflow.com/questions/8485998/lwuit-need-help-back-command-is-not-working-properly/8489653#8489653). The issue resolution description in in there.
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      1. POLWUIT: Need help `Back` command is not working properly
      1. USVimal
 

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