I make a custom Dialog like as :
public class CustomDialog extends Dialog {
public CustomDialog(String s) {
super(s, new String[] {"View","Cancel"}, new int [] {1,2}, 1, Bitmap.getPredefinedBitmap(Bitmap.EXCLAMATION), Manager.FOCUSABLE);
}
How can I set action for "View button" and " Cancel button " ?
I searched and not found what I have to do .
Please help me !
Attach a DialogClosedListener to your CustomDialog using Dialog.setDialogClosedListener(). When someone clicks either of the buttons, the DialogClosedListener.dialogClosed() method will be called and the button index will be passed as the choice parameter.
Check out this code.. this might help you..
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.container.HorizontalFieldManager;
public class CustomAlertDialog extends Dialog {
public CustomAlertDialog() {
super("Your Custom message for Dialoug" , null, null, Dialog.DISCARD, null, Dialog.VERTICAL_SCROLL);
HorizontalFieldManager hfm = new HorizontalFieldManager();
ButtonField view = null;
view = new ButtonField("view") {
protected boolean navigationClick(int status, int time) {
// do what ever you want
return true;
}
protected boolean keyChar(char key, int status, int time) {
// do what ever you want
return true;
}
};
ButtonField cancel = null;
cancel = new ButtonField("Cancel") {
protected boolean navigationClick(int status, int time) {
// do what ever you want
return true;
}
protected boolean keyChar(char key, int status, int time) {
// do what ever you want
return true;
}
};
hfm.add(view);
hfm.add(cancel);
this.add(hfm);
}
}
Related
Edited
...
I´m trying to deploy a new component in my BlackBerry app. I have a new class that extends of HorizontalFieldManager, where I instanced a new ListField. Inside of this, I overwrote the navigationClick method and I open a popup. The name of this component is CustomComponentHorizontal. I use this component in other component customized, its name is CustomComponentVertical. This is the code:
In Main.java:
...
CustomComponentVertical ccv=new CustomComponentVertical();
...
add(ccv);
In CustomComponentVertical
...
CustomComponentHorizontal cch=new CustomComponentHorizontal{
...
protected boolean navigationClick(int status, int time) {
//Should I do something here??
return super.navigationClick(status, time);
}
};
...
add(cch);
In CustomComponentHorizontal:
public class CustomComponentHorizontal extends HorizontalFieldManager {
ListField choiceField=null;
PopupScreen popup=null;
public CustomComponentHorizontal (){
choiceField = new ListField(){
public boolean navigationClick(int status, int time) {
Field focus = UiApplication.getUiApplication().getActiveScreen().getLeafFieldWithFocus();
if (focus instanceof ListField) {
popup = new ChoicePopupScreen(10, 50, choices);
popup.setChoice(choices);
UiApplication.getUiApplication().pushScreen(popup);
setPopup(popup);
return super.navigationClick(status, time);
}
};
}
}
}
My purpose is that when I click in my component, it is launched the navigationClick of listfield. When I put the focus in my component and click with trackpad, the popup no open. But, If I touch the screen over the component, and then I click with trackpad, popup open.
How could I open the popup from component without to use the touch event?
Thank you very much.
I copy pasted your code. There were some errors, and your callback was missing. So I fixed it up a bit and created a simple callback to test with, and the navigationClick fires. Hopefully this helps, let me know if there is a different issue I didn't understand.
public CustomComponent()
{
elements = new Vector();
elements.addElement("Element 0");
elements.addElement("Element 1");
elements.addElement("Element 2");
elements.addElement("Element 3");
elements.addElement("Element 4");
elements.addElement("Element 5");
choiceField = new ListField(elements.size())
{
public boolean navigationClick(int status, int time)
{
int index = getSelectedIndex();
Dialog.inform((String) elements.elementAt(index));
return true;
}
};
choiceField.setCallback(new ListFieldCallback()
{
public int indexOfList(ListField listField, String prefix, int start)
{
return elements.indexOf(prefix, start);
}
public int getPreferredWidth(ListField listField)
{
return Display.getWidth();
}
public Object get(ListField listField, int index)
{
return elements.elementAt(index);
}
public void drawListRow(ListField listField, Graphics graphics, int index, int y, int width)
{
String obj = (String) get(listField, index);
graphics.setColor(0x000000);
graphics.drawText(obj, 0, y, 0, width);
}
});
add(choiceField);
}
I am using finish() to close current activity before quit application in Android.
However, I cannot close screen in blackberry.
public class Main_AllLatestNews extends MainScreen {
public Main_AllLatestNews() {
super(USE_ALL_WIDTH);
}
private boolean Dialog() {
final Bitmap logo = Bitmap.getBitmapResource("icon.png");
d = new Dialog("确定离开？", new String[] { "是", "否" }, new int[] {
Dialog.OK, Dialog.CANCEL }, Dialog.OK,
logo) {
public void setChangeListener(FieldChangeListener listener) {
if (d.getSelectedValue() == Dialog.OK) {
} else {
d.close();
}
};
};
d.show();
return (d.doModal() == Dialog.OK);
}
public boolean onClose(){
if(Dialog()){
System.exit(0);
return true;
}else
return false;
}
}
Here is my Main class
public class Main extends UiApplication {
public static void main(String[] args) {
Main theApp = new Main();
theApp.enterEventDispatcher();
}
public Main() {
pushScreen(new MyScreen());
}
public final class MyScreen extends MainScreen {
private Bitmap logo = Bitmap.getBitmapResource("logo_page.png");
private BitmapField bmfield;
public MyScreen() {
setTitle("Oriental Daily");
bmfield = new BitmapField(logo, Field.FIELD_HCENTER
| BitmapField.FOCUSABLE) {
protected boolean navigationClick(int status, int time) {
Main.this.pushScreen(new Main_AllLatestNews());
Main.this.popScreen(MyScreen.this);
return true;
}
};
}
}
It depends on exactly how you want your close behaviour to work. Also, I can only read English, so I'm not 100% sure what your Dialog says. I'm assuming it's something to do with closing the app (yes or no)?
Anyway, usually, my apps close by overriding the onClose() method in the MainScreen subclass. You don't actually need to listen for the escape key. onClose() will get called normally when the user escapes all the way out of the app, or presses the little button with the blackberry icon, and then selects Close.
public final class MyScreen extends MainScreen {
/** #return true if the user chooses to close the app */
private boolean showDialog() {
Bitmap logo = Bitmap.getBitmapResource("icon.png");
Dialog d = new Dialog("确定离开？",
new String[] { "是", "否" },
new int[] { Dialog.OK, Dialog.CANCEL },
Dialog.OK,
logo);
return (d.doModal() == Dialog.OK);
}
/** Shutdown the app? */
public boolean onClose() {
if (showDialog()) {
System.exit(0);
return true;
} else {
// the user does not want to exit yet
return false;
}
}
}
I have a main class and a screen class. I have a button that launches a datepicker. When the datepicker is closed I need the label of the button to be refreshed with the selected value. How should I do that?
I tried with invalidate, creating a CustomButtonField that implements different onFocus, onUnFocus, and some other stuff but I guess I implemented them in a wrong way...
My two clases are these ones...
Main...
public class TestClass extends UiApplication
{
public static Calendar alarm1time = Calendar.getInstance(TimeZone.getTimeZone("GMT-3"));
public static void main(String[] args)
{
TestClass testClass = new TestClass ();
testClass.enterEventDispatcher();
}
public TestClass()
{
pushScreen(new TestClassScreen());
}
}
Screen...
public final class TestClassScreen extends MainScreen
{
public TestClassScreen()
{
ButtonField alarm1 = new ButtonField("Alarm : " + TestClass.alarm1time.get(Calendar.HOUR_OF_DAY) + ":" + TestClass.alarm1time.get(Calendar.MINUTE) ,ButtonField.FOCUSABLE)
{
public boolean navigationClick (int status , int time)
{
datePicker(1);
return true;
}
};
setTitle("Test Alarm");
add(new RichTextField(" "));
add(alarm1 );
}
public void datePicker(final int alarmNumber)
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
DateTimePicker datePicker = null;
datePicker = DateTimePicker.createInstance(TestClass.alarm1time, null, "HH:mm");
if(datePicker.doModal())
{
Calendar cal = datePicker.getDateTime();
TestClass.alarm1time = cal;
//Here I need the label to be refreshed, after the datePicker is Ok
}
}
});
}
}
I found one way in the Blackberry Development Forum...
public boolean navigationClick (int status , int time)
{
datePicker(1, this);
return true;
}
public void datePicker(final int alarmNumber, final ButtonField buttonToUpdate)
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
DateTimePicker datePicker = null;
datePicker = DateTimePicker.createInstance(TestClass.alarm1time, null, "HH:mm");
if(datePicker.doModal())
{
Calendar cal = datePicker.getDateTime();
TestClass.alarm1time = cal;
buttonToUpdate.setLabel(....)
}
}
});
}
A more usual way would be to have change listener listen for Button Clicks and do similar processing in there.
I think, this helps you:
public class Def extends MainScreen
{
ButtonField show;
LabelField label;
String str="";
ObjectChoiceField choiceField;
public Def()
{
createGUI();
}
private void createGUI()
{
String st_ar[]={"Date Picker"};
choiceField=new ObjectChoiceField("Select Date: ", st_ar)
{
protected boolean navigationClick(int status, int time)
{
DateTimePicker datePicker = DateTimePicker.createInstance( Calendar.getInstance(), "yyyy-MM-dd", null);
datePicker.doModal();
Calendar calendar=datePicker.getDateTime();
str=String.valueOf(calendar.get(Calendar.DAY_OF_MONTH))+"-"+String.valueOf(calendar.get(Calendar.MONTH)+1)+"-"+calendar.get(Calendar.YEAR);
return true;
}
};
add(choiceField);
label=new LabelField("",Field.NON_FOCUSABLE);
add(label);
show=new ButtonField("Show");
show.setChangeListener(new FieldChangeListener()
{
public void fieldChanged(Field field, int context)
{
label.setText("Time is: "+str);
}
});
add(show);
}
}
I create a custom menu in new class extends popupScreen. I went when the user clock on the menu button the menu display. I use this code
protected boolean keyDown(int keycode, int time) {
if(Keypad.KEY_MENU == Keypad.key(keycode))
{
UiApplication.getUiApplication().popScreen(getScreen());
Menu popup = new Menu();
UiApplication.getUiApplication().pushScreen(popup);
return true;
}
else
return super.keyDown(keycode, time);
}
but I obtain error on this line UiApplication.getUiApplication().pushScreen(popup); causes by pushScreen. How can I change this code or there is another method to display this menu.
try this
protected boolean keyDown(int keycode, int time) {
if(Keypad.KEY_MENU == Keypad.key(keycode))
{
synchronized (UiApplication.getEventLock())
{
UiApplication.getUiApplication().popScreen(getScreen());
Menu popup = new Menu();
UiApplication.getUiApplication().pushScreen(popup);
}
return true;
}
else
return super.keyDown(keycode, time);
}
In Blackberry, creating, displaying and hiding of Menu is handled by the system; you will be provided with callbacks at appropriate time. The callbacks you will need to code are:
public boolean onMenu( int instance )
{
return true; // Menu is created
}
public void makeMenu( Menu menu, int instance )
{
MenuItem _desired_menu_item = new MenuItem()
{
public void run()
{
}
}
menu.add( _desired_menu_item );
super.makeMenu( menu, instance)
}
That's it! It would work. Please check Blackberry "UI and Navigation guide" for more details
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 11 years ago.
Can anybody suggest me how to create a clickable list field in blackberry such that on clicking one item a new screen must appear.
I've done a similar work with VerticalFieldManager and custom extended Field on JDE 5.0.
I assume that you have a list of objects that you wanted to display on main screen.
First; create a class which extends Field for your list's item, override its paint method, layout method and otuher events as your requirements.
Next, create a main screen that you wanted to show the list. Once you have populated your object list, in a loop, pass each object model to previously created field's constructor. Then add fieldChanged event to that field and add it to verticalFieldManager.
You need to override the events (like fieldChanged event) as you want to click on it and display its detail on another screen.
Finally, create a detail screen that takes required arguments to display your list item's object detail. On fieldChanged event of your main screen implementation, pass your object to detail screen and push the detail screen.
Also, this approach may be useful for you.
Example:
custom field:
public class CListItemField extends Field {
private CListItemModel model;
public CListItemField(CListItemModel _model, long style) {
super(style);
this.model = _model;
}
public CListItemModel getModel() {
return this.model;
}
// overrides
public int getPreferredHeight() {
//return custom height
}
public int getPreferredWidth() {
//return custom width
}
protected void layout(int width, int height) {
setExtent(Math.min(width, getPreferredWidth()), getPreferredHeight());
}
protected void paint(Graphics g) {
//custom paint stuff (borders, fontstyle, text position, icons etc.)
if (isFocus()) {
//focused item display settings
} else {
//item display settings
}
}
protected void drawFocus(Graphics graphics, boolean on) {
}
public boolean isFocusable() {
return true;
}
protected void onFocus(int direction) {
super.onFocus(direction);
invalidate();
}
protected void onUnfocus() {
super.onUnfocus();
invalidate();
}
protected boolean navigationClick(int status, int time) {
fieldChangeNotify(0);
return true;
}
protected boolean keyChar(char character, int status, int time) {
//send key event to listener
if (character == Keypad.KEY_ENTER) {
fieldChangeNotify(0);
return true;
}
return super.keyChar(character, status, time);
}
}
list screen:
public class ScreenListbox extends MainScreen implements FieldChangeListener, FocusChangeListener {
private VerticalFieldManager verticalField;
private Vector listItemVector;
public ScreenOttoInbox(String title) {
super(title, Manager.NO_VERTICAL_SCROLL);
setData();
setComponents();
}
private void setData() {
//populate listItemVector according to your business (ie. read json response then parse it and collect it to a vector)
}
public void setComponents() {
verticalField = new VerticalFieldManager(Manager.VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR);
setListContent(verticalField, listItemVector);
add(verticalField);
}
private void setListContent(VerticalFieldManager field, Vector vector) {
try {
int vlen = vector.size();
for (int i = 0; i < vlen; i++) {
CListItemModel model = (CListItemModel) vector.elementAt(i);
CListItemField itemField = new CListItemField(model, Field.FOCUSABLE | Field.ACTION_INVOKE);
itemField.setChangeListener(this);
itemField.setFocusListener(this);
field.add(itemField);
}
} catch (Exception ex) { }
}
protected boolean onSavePrompt() {
return true;
}
public void fieldChanged(Field field, int context) {
//custom field's click/touch event handler
CListItemField itemField = (CListItemField) field;
ScreenItemDetail scrDetail = new ScreenItemDetail(itemField.getModel());
ScreenUtil.pushScreenWithLoader(scrDetail,true);
}
protected void onDisplay() {
super.onDisplay();
}
}
Create a class like below.
import java.util.Vector;
import net.rim.device.api.collection.util.SparseList;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.ListField;
import net.rim.device.api.ui.component.ListFieldCallback;
public class CListCallback implements ListFieldCallback {
private String[] resource;
private int rgb=Color.BLACK;
Vector elements;
Bitmap arraow;
public CListCallback(String[] resources){
this.resource=resources;
}
public void drawListRow(ListField listField, Graphics graphics, int index,
int y, int width) {
String text=(String) get(listField, index);
graphics.setColor(rgb);
graphics.drawText(text,60,y+25);
graphics.drawLine(0, y+59, DConfig.disWidth, y+59);
}
public Object get(ListField listField, int index) {
return resource[index];
}
public int getPreferredWidth(ListField listField) {
return DConfig.disWidth+10;
}
public int indexOfList(ListField listField, String prefix, int start) {
return -1;
}
}
And use above class in MainScreen class.
CListCallback clmenu=new CListCallback(arrayitems);
final ListField lf = new ListField(arraymenu.length) {
protected boolean keyChar(char character, int status, int time) {
if (character == Keypad.KEY_ENTER) {
fieldChangeNotify(0);
return true;
}
return super.keyChar(character, status, time);
}
protected boolean navigationUnclick(int status, int time) {
fieldChangeNotify(0);
return true;
}
};
lf.setCallback(clmenu);
lf.setRowHeight(60);
lf.setChangeListener(new FieldChangeListener() {
public void fieldChanged(Field field, int context)
{
int index=lf.getSelectedIndex();
UiApplication.getUiApplication.pushScreen(newNewScreen(imgarray[index]));
}
});
add(lf);
Thats it.it will work