ObjectChoiceField FieldChangeListener problem
Hi all
I'm coding an application for 4.5 but testing on BB 9500.
I want to a few call webservice on the choice of an ObjectChoiceField.
But the problem is that the FieldChangeListener of the ObjectChoiceField fires on the development as well as on the selection of the field.
How to distinguish two event?
Thaks for your help in advance.
Hi all
I found the solution to my problem.
Below is sample code for the solution.
ObjectChoiceField myObjectField= new ObjectChoiceField("",new String[] { "" }, 0, FIELD_LEFT)
{
protected void fieldChangeNotify(int context)
{
new myObjectField_change_method();
}
public void focusChangeNotify(int arg0)
{
super.focusChangeNotify(arg0);
}
};
In the code above myObjectField_change_method() is a method to be triggered when the field is selected.
Tags: BlackBerry Developers
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s.Kumaran.
Ooops... It was a mistake to programming baisc. glad you figured it out. You can mark the thread as solved.
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import net.rim.device.api.ui.component.Dialog; import net.rim.device.api.ui.component.LabelField; import net.rim.device.api.ui.component.Menu; import net.rim.device.api.ui.component.SeparatorField; import net.rim.device.api.ui.container.HorizontalFieldManager; import net.rim.device.api.ui.container.MainScreen; import net.rim.device.api.ui.container.VerticalFieldManager; import net.rim.device.api.ui.decor.Border; import net.rim.device.api.ui.decor.BorderFactory; public class Screen2 extends MainScreen implements FieldChangeListener { //DECLARE MENU BUTTONS protected void makeMenu(Menu menu, int instance) { menu.add(_home); menu.add(_close); } private MenuItem _home = new MenuItem("Home Page", 110, 10) { public void run() { onHome(); } }; public boolean onHome() { Dialog.alert("Homepage Selected"); UiApplication.getUiApplication().popScreen(this); UiApplication.getUiApplication().pushScreen(new Screen1()); return true; } private MenuItem _close = new MenuItem("Close", 110, 10) { public void run() { onClose(); } }; public boolean onClose() { Dialog.alert("Goodbye!"); System.exit(0); return true; } //SCREEN 2 METHOD Screen2() { HorizontalFieldManager _fieldManagerTop = new HorizontalFieldManager(); VerticalFieldManager _fieldManagerMiddle = new VerticalFieldManager(); HorizontalFieldManager _fieldManagerBottom = new HorizontalFieldManager(); HorizontalFieldManager _fieldManagerButton = new HorizontalFieldManager(); //SET TITLE: FINANCIAL APPLICATION LabelField title = new LabelField ("Financial Application", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER); Font titleFont = this.getFont().derive(Font.BOLD | Font.ITALIC); title.setFont(titleFont); setTitle(title); //SET PAGE & INFO TEXT LabelField _page = new LabelField("Page Two ~ Interest", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER); LabelField _info = new LabelField("\nNow please enter the interest that will be put on this investment", LabelField.USE_ALL_WIDTH); //INPUT FIELD W/ BORDER BasicEditField _input = new BasicEditField(); XYEdges padding = new XYEdges(10, 10, 10, 10); int color = Color.DARKGREEN; int lineStyle = Border.STYLE_SOLID; Border inputBorder = BorderFactory.createRoundedBorder(padding, color, lineStyle); _input.setBorder(inputBorder); //ADD FIELDS AND SEPARATORS add(_fieldManagerTop); add(new SeparatorField()); add(_fieldManagerMiddle); add(new SeparatorField()); add(_fieldManagerBottom); add(new SeparatorField()); add(_fieldManagerButton); //ADD PAGE, INFO, INPUT _fieldManagerTop.add(_page); _fieldManagerMiddle.add(_info); _fieldManagerBottom.add(_input); //CREATE BUTTON TO NEXT PAGE ButtonField pressButton = new ButtonField("NEXT"); pressButton.setChangeListener(this); _fieldManagerButton.add(pressButton); } //BUTTON FIELD CHANGE: ACTIONS public void fieldChanged(Field field, int context) { UiApplication.getUiApplication().popScreen(this); UiApplication.getUiApplication().pushScreen(new Screen3()); } }//SCREEN 3 INPUTS *COMPOUND PERIOD* package com.rim.samples.Finance; import net.rim.device.api.ui.Color; import net.rim.device.api.ui.DrawStyle; import net.rim.device.api.ui.Field; import net.rim.device.api.ui.FieldChangeListener; import net.rim.device.api.ui.Font; import net.rim.device.api.ui.MenuItem; import net.rim.device.api.ui.UiApplication; import net.rim.device.api.ui.XYEdges; import net.rim.device.api.ui.component.BasicEditField; import net.rim.device.api.ui.component.ButtonField; import net.rim.device.api.ui.component.Dialog; import net.rim.device.api.ui.component.LabelField; import net.rim.device.api.ui.component.Menu; import net.rim.device.api.ui.component.ObjectChoiceField; import net.rim.device.api.ui.component.SeparatorField; import net.rim.device.api.ui.container.HorizontalFieldManager; import net.rim.device.api.ui.container.MainScreen; import net.rim.device.api.ui.container.VerticalFieldManager; import net.rim.device.api.ui.decor.Border; import net.rim.device.api.ui.decor.BorderFactory; public class Screen3 extends MainScreen implements FieldChangeListener { //DECLARE MENU BUTTONS protected void makeMenu(Menu menu, int instance) { menu.add(_home); menu.add(_close); } private MenuItem _home = new MenuItem("Home Page", 110, 10) { public void run() { onHome(); } }; public boolean onHome() { Dialog.alert("Homepage Selected"); UiApplication.getUiApplication().popScreen(this); UiApplication.getUiApplication().pushScreen(new Screen1()); return true; } private MenuItem _close = new MenuItem("Close", 110, 10) { public void run() { onClose(); } }; public boolean onClose() { Dialog.alert("Goodbye!"); System.exit(0); return true; } //SCREEN 3 METHOD Screen3() { HorizontalFieldManager _fieldManagerTop = new HorizontalFieldManager(); VerticalFieldManager _fieldManagerMiddle = new VerticalFieldManager(); HorizontalFieldManager _fieldManagerBottom = new HorizontalFieldManager(); HorizontalFieldManager _fieldManagerButton = new HorizontalFieldManager(); //SET TITLE: FINANCIAL APPLICATION LabelField title = new LabelField ("Financial Application", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER); Font titleFont = this.getFont().derive(Font.BOLD | Font.ITALIC); title.setFont(titleFont); setTitle(title); //SET PAGE & INFO TEXT LabelField _page = new LabelField("Page Three ~ Compound Period", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER);; LabelField _info = new LabelField("\nNow please enter the compound period.\npress spacebar to go through the choices:", LabelField.USE_ALL_WIDTH);; //ADD FIELDS AND SEPARATORS add(_fieldManagerTop); add(new SeparatorField()); add(_fieldManagerMiddle); add(new SeparatorField()); add(_fieldManagerBottom); add(new SeparatorField()); add(_fieldManagerButton); //OBJECT CHOICE FIELD String choicestrs[] = {"Weekly", "Bi-Weekly", "Monthly", "Quarterly", "Annually"}; ObjectChoiceField choice = new ObjectChoiceField("Compound Period: ", choicestrs, 0); //ADD PAGE, INFO, OBJECT CHOIE TO FIELD _fieldManagerTop.add(_page); _fieldManagerMiddle.add(_info); _fieldManagerBottom.add(choice); //CREATE BUTTON TO NEXT PAGE ButtonField press2Button = new ButtonField("NEXT"); press2Button.setChangeListener(this); _fieldManagerButton.add(press2Button); } //BUTTON FIELD CHANGE: ACTIONS public void fieldChanged(Field field, int context) { UiApplication.getUiApplication().popScreen(this); UiApplication.getUiApplication().pushScreen(new Screen4()); } }//SCREEN 4 INPUTS *LENGTH OF INVESTMENT* package com.rim.samples.Finance; import net.rim.device.api.ui.Color; import net.rim.device.api.ui.DrawStyle; import net.rim.device.api.ui.Field; import net.rim.device.api.ui.FieldChangeListener; import net.rim.device.api.ui.Font; import net.rim.device.api.ui.MenuItem; import net.rim.device.api.ui.UiApplication; import net.rim.device.api.ui.XYEdges; import net.rim.device.api.ui.component.BasicEditField; import net.rim.device.api.ui.component.ButtonField; import net.rim.device.api.ui.component.Dialog; import net.rim.device.api.ui.component.LabelField; import net.rim.device.api.ui.component.Menu; import net.rim.device.api.ui.component.SeparatorField; import net.rim.device.api.ui.container.HorizontalFieldManager; import net.rim.device.api.ui.container.MainScreen; import net.rim.device.api.ui.container.VerticalFieldManager; import net.rim.device.api.ui.decor.Border; import net.rim.device.api.ui.decor.BorderFactory; public class Screen4 extends MainScreen implements FieldChangeListener { //DECLARE MENU BUTTONS protected void makeMenu(Menu menu, int instance) { menu.add(_home); menu.add(_close); } private MenuItem _home = new MenuItem("Home Page", 110, 10) { public void run() { onHome(); } }; public boolean onHome() { Dialog.alert("Homepage Selected"); UiApplication.getUiApplication().popScreen(this); UiApplication.getUiApplication().pushScreen(new Screen1()); return true; } private MenuItem _close = new MenuItem("Close", 110, 10) { public void run() { onClose(); } }; public boolean onClose() { Dialog.alert("Goodbye!"); System.exit(0); return true; } //SCREEN 4 METHOD Screen4() { HorizontalFieldManager _fieldManagerTop = new HorizontalFieldManager(); VerticalFieldManager _fieldManagerMiddle = new VerticalFieldManager(); HorizontalFieldManager _fieldManagerBottom = new HorizontalFieldManager(); HorizontalFieldManager _fieldManagerButton = new HorizontalFieldManager(); //SET TITLE: FINANCIAL APPLICATION LabelField title = new LabelField ("Financial Application", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER); Font titleFont = this.getFont().derive(Font.BOLD | Font.ITALIC); title.setFont(titleFont); setTitle(title); //SET PAGE & INFO TEXT LabelField _page = new LabelField("Page Four ~ Investment Length", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER); LabelField _info = new LabelField("\nNow please enter how long you will have this investment for?\nPlease enter the amount in months:", LabelField.USE_ALL_WIDTH); //INPUT FIELD W/ BORDER BasicEditField _input = new BasicEditField(); XYEdges padding = new XYEdges(10, 10, 10, 10); int color = Color.DARKGREEN; int lineStyle = Border.STYLE_SOLID; Border inputBorder = BorderFactory.createRoundedBorder(padding, color, lineStyle); _input.setBorder(inputBorder); //ADD FIELDS AND SEPARATORS add(_fieldManagerTop); add(new SeparatorField()); add(_fieldManagerMiddle); add(new SeparatorField()); add(_fieldManagerBottom); add(new SeparatorField()); add(_fieldManagerButton); //ADD PAGE, INFO, INPUT _fieldManagerTop.add(_page); _fieldManagerMiddle.add(_info); _fieldManagerBottom.add(_input); //CREATE BUTTON TO NEXT PAGE ButtonField pressButton = new ButtonField("NEXT"); pressButton.setChangeListener(this); _fieldManagerButton.add(pressButton); } //BUTTON FIELD CHANGE: ACTIONS public void fieldChanged(Field field, int context) { UiApplication.getUiApplication().popScreen(this); UiApplication.getUiApplication().pushScreen(new InvestmentWorth()); } }//INVESTMENT WORTH package com.rim.samples.Finance; import net.rim.device.api.ui.Color; import net.rim.device.api.ui.DrawStyle; import net.rim.device.api.ui.Field; import net.rim.device.api.ui.FieldChangeListener; import net.rim.device.api.ui.Font; import net.rim.device.api.ui.Manager; import net.rim.device.api.ui.MenuItem; import net.rim.device.api.ui.UiApplication; import net.rim.device.api.ui.XYEdges; import net.rim.device.api.ui.component.ButtonField; import net.rim.device.api.ui.component.Dialog; import net.rim.device.api.ui.component.LabelField; import net.rim.device.api.ui.component.Menu; import net.rim.device.api.ui.component.SeparatorField; import net.rim.device.api.ui.container.HorizontalFieldManager; import net.rim.device.api.ui.container.MainScreen; import net.rim.device.api.ui.container.VerticalFieldManager; import net.rim.device.api.ui.decor.Border; import net.rim.device.api.ui.decor.BorderFactory; public class InvestmentWorth extends MainScreen { //DECLARE MENU BUTTONS protected void makeMenu(Menu menu, int instance) { menu.add(_close); } private MenuItem _close = new MenuItem("Close", 110, 10) { public void run() { onClose(); } }; public boolean onClose() { Dialog.alert("Goodbye!"); System.exit(0); return true; } //SCREEN 1 METHOD InvestmentWorth() { HorizontalFieldManager _fieldManagerTop = new HorizontalFieldManager(Manager.VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR); VerticalFieldManager _fieldManagerMiddle = new VerticalFieldManager(Manager.VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR); HorizontalFieldManager _fieldManagerBottom = new HorizontalFieldManager(Manager.VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR); //SET TITLE: FINANCIAL APPLICATION LabelField title = new LabelField ("Financial Application", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER); Font titleFont = this.getFont().derive(Font.BOLD | Font.ITALIC); title.setFont(titleFont); setTitle(title); //SET PAGE & INFO TEXT LabelField _page = new LabelField("Homepage ~ Initial Investment", LabelField.USE_ALL_WIDTH | DrawStyle.HCENTER); LabelField _info = new LabelField("\nHere is the worth of your investment:\n", LabelField.USE_ALL_WIDTH); //INPUT FIELD W/ BORDER LabelField _worth = new LabelField(); XYEdges padding = new XYEdges(10, 10, 10, 10); int color = Color.BLACK; int lineStyle = Border.STYLE_SOLID; Border inputBorder = BorderFactory.createRoundedBorder(padding, color, lineStyle); _worth.setBorder(inputBorder); //ADD FIELDS AND SEPARATORS add(_fieldManagerTop); add(new SeparatorField()); add(_fieldManagerMiddle); add(new SeparatorField()); add(_fieldManagerBottom); //ADD PAGE, INFO, INPUT _fieldManagerTop.add(_page); _fieldManagerMiddle.add(_info); _fieldManagerBottom.add(_worth); } }So when I run on the emulator, on Blackbery 8520 SDK emulator, it doesn't let me scroll upwards on the first screen to see the rest of the text, it's like the cursor on the button sticks or editing field base so it wont allow to exceed upwards the button or basic edit field , but I can scroll between them.
Second problem is trying to address (as defined in the first class) variables to different edit fields so when something is typed in (double), it is placed in the variable to use in the rest of the program. I want to make sure the basic edit fields only allow "double" number entered, otherwise it displays a message 'incorrect type '. Please help me with this, or give me some advice.
I would REALLY appreciate it.
LabelFields will display several lines later the OS, so maybe this isn't a problem. However, LabelFields are by default not active, so you can't scroll on them. RichTextFields are active by default. So either change your LabelFields for et focusable (style LabelField.FOCUSABLE) pr change to RichTextField, as the previous poster suggested.
I do not understand your second question, what are the numbers 'double '?
However, I was watching the styles FILTER_ that you can use to BasicEditField or watch extending TextFilter to check the characters that they are entered. I suspect TextFilter is the right way to go, but I've never done anything like this. But having a good overview in this field and classes that extends.
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Hide/show the ObjectChoiceField...
Hello
I have a screen that has hierarchical menus (ObjectChoiceFields). For example, category, subcategory, and Type.
Type of choice will fill a selection of the subcategory. Same subcategory will be filled based on the selection of the category. In some case there is no subcategories and Types for certain categories and so on for the subcategories. In this scenario, OS 5 and above to show the space reserved for the empty ObjectChoiceFields.
Is it possible to hide when I don't need them and show them only when I need it?
I really apprecaite your answer. If the solution is little complex so please give me an example on how to do it because I'm still growing in this area.
Thank you very much in advance,
Vincent
It's actually a pretty common question.
You can dynamically add and remove fields from managers, and when you do, these managers are re-built-out.
It means finding a way to determine when you should add and/or remove the category and Type. You can do this with a FieldChangeListener on the category field, will get called whenever the user switches to another choice in the categories available, you can add and delete (and repopulate) fields then, according to the selected index.
The next problem is where to 'Add' them. Normally, you just make one
. Add ( ); but who's going to the field at the bottom of the Manager. Another option is
. Insert ( , index); That you will get through the fields to the right place.
How do detect you if the area has indeed been added. General, I do the following
Manager m =
. getManager(). If (m == null) {}
has not been added
} else {}
has been added
}
I hope that you get. As stated, this question was asked before, typically on the addition or deletion of checkboxFields. If you want more search for this.
Good luck.
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ObjectChoiceField getSelectedIndex method always returns-1
Hello
I am facing a problem since these days, but I couldn't get an answer to the it from anywhere. I hope I can get the answer here:
I have a screen that has Menu and ObjectChoiceField but when I want to extract the ObjectChoiceField getSelectedIndex, it always returns-1. I don't know why! The code is very simple. If please see this and tell me where I'm wrong:
public class ConfigurationScreen extends MainScreen implements FieldChangeListener { private ObjectChoiceField list; private MyMenuItem save; // I have a class for this seperately. String [] cities ; public ConfigurationScreen () { cities = new String [] {"New York","London","Paris"}; list = new ObjectChoiceField ("Cities :", cities); list.setChangeListener(this); this.add(list); save = new MyMenuItem("Save",1,0){ public void run () { Dialog.alert(list.getSelectedIndex()+""); } }; this.addMenuItem(save); } public boolean onClose() { Dialog.alert(list.getSelectedIndex()+""); return true; } public void fieldChanged(Field field, int context) { int selectedIndex = list.getSelectedIndex(); Dialog.alert(selectedIndex+""); } } }The code could have a few spelling mistakes, but there is no syntax error in it. I get-1 whereeve I call the method getSelectedIndex()!
Help, please
Try this. It worked for me. Tested on BB 9000 Simulator. JDE 4.6.
public class ConfigurationScreen extends MainScreen implements FieldChangeListener { private ChoiceField list; String [] cities ; public ConfigurationScreen () { cities = new String [] {"New York","London","Paris"}; list = new ObjectChoiceField ("Cities :", cities); list.setChangeListener(this); this.add(list); } public boolean onClose() { Dialog.alert(list.getSelectedIndex()+""); return true; } public void fieldChanged(Field field, int context) { int selectedIndex = list.getSelectedIndex(); Dialog.alert(selectedIndex+""); } } -
problem compiling under JDE 4.6
I got this error when compile my project 4.3 to 4.6
C:\Program Research In Motion\BlackBerry JDE 4.3.0\samples\com\rim\samples\device\TestApp\DialScreen.java:159: cannot access net.rim.device.api.ui.component.ListFieldMeasureCallback
file not found net\rim\device\api\ui\component\ListFieldMeasureCallback.class
private class MyObjectListField extends ObjectListField {}This error can be triggered by the expansion of some areas such as the ObjectChoiceField. We are aware of this problem and it was reported to our development team.
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