I am trying to write a application using LWUIT where I want a image to be displayed on click of a button.
I have the following code. But I get an exception if the button is clicked twice.
Please help me display the image without giving any exception.
final Form f = new Form("Static TAF");
Button TrackMe = new Button("TrackMe");
Image TrackMeicon = null;
TrackMeicon = Image.createImage("/hello/follow.jpeg");
final Label TrackMeLabel = new Label(TrackMeicon);
TrackMe.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
System.out.println("Removing the previous Images");
f.addComponent(TrackMeLabel);
}
});
Please Help
When you are clicking the button for the first time, image is added to the form. When you are clicking for the second time, that image already exists in the form. So, it will throw "Component already exists" exception.
Your action listener should be
TrackMe.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae) {
System.out.println("Removing the previous Images");
f.removeComponent(TrackMeLabel);
f.addComponent(TrackMeLabel);
}
});
TrackMe.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae) {
System.out.println("Removing the previous Images");
final Label TrackMeLabel = new Label(TrackMeicon);
f.removeAll();
f.addComponent(TrackMeLabel);
}
});
If you want yo add only one image you can use this:
....
TrackMe.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae) {
if(!f.containes(TrackMeLabel))
f.addComponent(TrackMeLabel);
}
if you want some imges you need something like that:
....
TrackMe.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae) {
Image TrackMeicon = null;
TrackMeicon = Image.createImage("/hello/follow.jpeg");
Label TrackMeLabel = new Label(TrackMeicon);
f.addComponent(TrackMeLabel);
}
Related
I have customized my form titlebar and added buttons to it. Is it possible to add a listener to one of the buttons to add command(s) an overflow menu and show it.
Yes, command/s can be added to overflow menu by using the following codes and actionPerformed is called when click on the command
Toolbar toolbar = new Toolbar();
f.setToolbar(toolbar);
toolbar.addCommandToOverflowMenu(new Command("Test") {
#Override
public void actionPerformed(ActionEvent evt) {
showForm("NewForm",null);
}
});
Please try this it displays overflow menu when you click on button.
void showOverFlow(final Form f) {
Toolbar toolbar = new Toolbar();
f.setToolBar(toolbar);
toolbar.addCommandToOverflowMenu(new Command("overflow"));
Button button = new Button("show menu");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if (f.getToolbar() != null) {
MenuBar mb = f.getToolbar().getMenuBar();
if (mb != null) {
mb.showMenu();
}
}
}
});
toolbar.addComponent(BorderLayout.WEST,button);
}
i am trying to make an app in Codename one where i want to create a handburger menu on the right side at the top of the screen and a back button on the left side, but cannot get it to work I know it can be done where you have a handburger menu on the left side and a button on the right side. I made a picture of how I want it to look like. The back button is added in paint and not through the code.
Picture of app example
below is the code that I have used to get the menu on the right side.
public class MainForm {
public static Form mainForm;
Command cmd_back, cmd_AboutTheApp;
private enum SideMenuMode {
SIDE, RIGHT_SIDE {
public String getCommandHint() {
return SideMenuBar.COMMAND_PLACEMENT_VALUE_RIGHT;
}
};
public String getCommandHint() {
return null;
}
public void updateCommand(Command c) {
String h = getCommandHint();
if(h == null) {
return;
}
c.putClientProperty(SideMenuBar.COMMAND_PLACEMENT_KEY, h);
}
};
SideMenuMode mode = SideMenuMode.RIGHT_SIDE;
public void init(Object context) {
theme = UIManager.initFirstTheme("/theme");
UIManager.getInstance().setThemeProps(theme.getTheme theme.getThemeResourceNames()[0]));
UIManager.getInstance().getLookAndFeel().setMenuBarClass(SideMenuBar.class);
Display.getInstance().setCommandBehavior(Display.COMMAND_BEHAVIOR_SIDE_NAVIGATION);
}
public void start() {
if(mainForm != null){
mainForm.show();
return;
}
mainForm = new Form();
mainForm.setTitleComponent(title);
mainForm.setLayout(new BorderLayout());
addCommands(mainForm);
}
private void addCommands(Form f){
cmd_Back = new Command("Back");
final Button btn_Back = new Button("Back");
cmd_Back.putClientProperty("TitleCommand", btn_Back);
btn_BackButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//do some thing
}
});
cmd_AboutTheApp = new Command("About the app");
final Button btn_AboutTheApp = new Button("About the app");
cmd_AboutTheApp.putClientProperty("SideComponent", btn_AboutTheApp);
btn_AboutTheApp.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//do some thing
}
});
mode.updateCommand(cmd_Back);
f.addCommand(cmd_Back);
mode.updateCommand(cmd_AboutTheApp);
f.addCommand(cmd_AboutTheApp);
}
}
if I move the back button so that it is added after AboutTheApp button then the back button is displayed on the right side of the screen but also to the right of the menu, which is also on the right side. I've tried a lot of different ways but none seems to be working
We supported a right side menu bar in the SideMenuBar but not in the Toolbar API. We support placing components/commands in the left/right side of the title area in the Toolbar API but not in the SideMenuBar.
I guess the solution is to add support for the right menu bar into the Toolbar API but I'm not sure what the complexities are for such a change.
I suggest filing an RFE in the issue tracker asking for this but it probably won't be soon as we are closing the features for 3.3 right now.
I have an app that does this. Search Google Play (or App Store) for "Torquepower Diesel Cummins Engine" app.
in the theme Constants I set my own rightSideMenuImage and rightSideMenuPressImage, but the default hamburger menu may be OK for you.
On the beforeXXXX of each form I do something like this:
super.beforePartNumberForm(f);
Toolbar tb = createToolbar(f);
createBackCommand(f, tb);
addHelpX(tb);
addViewCartX(tb);
addCallTorquepowerX(tb);
addReverseSwipe(f);
create the toolbar
Toolbar createToolbar(Form f) {
Toolbar tb = new Toolbar();
f.setToolBar(tb);
Label l = new Label();
l.setIcon(res.getImage("tpd_logoZZ.png"));
tb.setTitleComponent(l);
return tb;
}
create the back button
void createBackCommand(Form f, Toolbar tb) {
Command c = new Command("") {
#Override
public void actionPerformed(ActionEvent evt) {
back();
}
};
c.setIcon(res.getImage("black_left_arrow-512.png"));
c.setPressedIcon(res.getImage("grey_left_arrow-512.png"));
// MUST set this before adding to toolbar, else get null pointer
f.setBackCommand(c);
tb.addCommandToLeftBar(c);
}
add whatever commands are needed to the sidemenu
void addHelpX(Toolbar tb) {
Command c = new Command("Help") {
#Override
public void actionPerformed(ActionEvent evt) {
showForm("HelpForm", null);
}
};
c.putClientProperty(SideMenuBar.COMMAND_PLACEMENT_KEY, SideMenuBar.COMMAND_PLACEMENT_VALUE_RIGHT);
c.putClientProperty("SideComponent", new SideMenuItem(fetchResourceFile(), c.toString(), "very_basic_about.png"));
c.putClientProperty("Actionable", Boolean.TRUE);
tb.addCommandToSideMenu(c);
}
I use my own SideMenuItem which is:
public class SideMenuItem extends Button {
SideMenuItem() {
this("");
}
SideMenuItem(String s) {
super(s);
setUIID("SideMenuItem");
int h = Display.getInstance().convertToPixels(8, false);
setPreferredH(h);
}
SideMenuItem(Resources res, String s, String icon) {
super();
setIcon(res.getImage(icon));
setText(s);
setUIID("SideMenuItem");
int h = Display.getInstance().convertToPixels(8, false);
setPreferredH(h);
}
}
I am new to codenameone, how can i hide form element in a button click?
myButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent evt) {
//hide element
}
}
If you are using the latest Codenameone plugin, you can do:
myButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent evt) {
myElement.setHidden(true);
myElement.getParent().animateLayout(200);
}
}
OR
If the button has an actionEvent from GUI, do:
#Override
protected void onMyForm_MyButtonAction(Component c, ActionEvent event) {
findMyElement(c).setHidden(true);
findMyElement(c).getParent().animateLayout(200);
}
And to reveal it, do:
myElement.setHidden(false);
myElement.getParent().animateLayout(200);
Use setVisible(boolean visible) (see https://www.codenameone.com/javadoc/com/codename1/ui/Component.html)
I have created a register form (not using the designer).
On the form I have created numerous text fields as well as a button with ...
Button btnRegister = new Button();
btnRegister.setName("btnRegister");
btnRegister.setText("Register");
btnRegister.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
frmRegister_btnRegister(f);
}
});
f.addComponent(btnRegister);
My question is how do I reference the textfields in the function being called from the button action listener. Specifically I am trying to set up arguments to use for a network call using addArgument. When I used the designer I used find(ComponentName) but that is not available anymore.
private void frmRegister_btnRegister(Form f) {
// register new user
ConnectionRequest r = new ConnectionRequest();
r.setUrl(sUrlWebSvc);
r.setPost(true);
r.addArgument("Rest", "1"); // restaurant code
r.addArgument("Req", "Register"); // R = register
//r.addArgument("first_name", findTxtUsertName(c).getText());
// show spinning dialog while connecting
InfiniteProgress prog = new InfiniteProgress();
Dialog dlg = prog.showInifiniteBlocking();
r.setDisposeOnCompletion(dlg);
NetworkManager.getInstance().addToQueueAndWait(r);
//System.out.println(r.getResponseData());
}
Assuming its defined just above this line:
Button btnRegister = new Button();
As:
TextField txt =....
Just change it to:
final TextField txt =....
And then you can pass it (or its getText() string value) to:
btnRegister.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
frmRegister_btnRegister(f, txt);
}
});
Naturally you will need to update the signature of frmRegister_btnRegister to accept a text field or a string.
I am following this exactly:
http://msdn.microsoft.com/en-us/library/ms185301.aspx
but can't get it to work. The form appears when I try and add my new item, but when I input text and click the button, nothing happens.
For posterity's sake here is my code:
The non-empty methods in the Wizard class which extends IWizard
public void RunStarted(object automationObject,
Dictionary<string, string> replacementsDictionary,
WizardRunKind runKind, object[] customParams)
{
try
{
// Display a form to the user. The form collects
// input for the custom message.
inputForm = new UserInputForm();
inputForm.ShowDialog();
customMessage = inputForm.get_CustomMessage();
// Add custom parameters.
replacementsDictionary.Add("$custommessage$",
customMessage);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
// This method is only called for item templates,
// not for project templates.
public bool ShouldAddProjectItem(string filePath)
{
return true;
}
The user input form code:
public partial class UserInputForm : Form
{
private string customMessage;
public UserInputForm()
{
InitializeComponent();
}
public string get_CustomMessage()
{
return customMessage;
}
private void button1_Click(object sender, EventArgs e)
{
customMessage = textBox1.Text;
this.Dispose();
}
}
And the button is indeed named button 1:
this.button1.Location = new System.Drawing.Point(200, 180);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(100, 40);
this.button1.TabIndex = 0;
this.button1.Text = "Click Me";
this.button1.UseVisualStyleBackColor = true;
So I don't have much experience with Windows Forms (do web apps), but I am following the directions on MSDN and it's pretty clear cut. Any suggestions? Can anyone else get this to work?
Okay I figured it out. I had to add the event handler in the form's constructor manually:
public UserInputForm()
{
InitializeComponent();
button1.Click += button1_Click;
}
Why this isn't in the documentation on MSDN boggles my mind.
If you use the WinForms designer mode to drag your button from the Toolbox, and then double-clicked the button in the designer view, it would have added the event handler and stubbed that Click method for you. Just FYI.