I want to override default menu items. For example, ask for password when DELETE menu of download screen is pressed. For that, I need to override delete menu item of blackberry default menu of download screen.
There is no way to do that unless you may extend a screen that shows this menu item.
Then you may override makeMenu() method and amend menu items list.
Any default BlackBerry menu item can be removed using this technique:
protected void makeMenu(Menu menu, int instance)
{
// Remove Delete menu item
for( int i = 0; i < menu.getSize(); ++i )
{
MenuItem item = menu.getItem(i);
if( item.toString().equals("Delete") )
{
menu.deleteItem(i);
break;
}
}
super.makeMenu(menu, instance);
}
Related
I had to remove all the default menus in blackberry. I have used the following code
protected void makeMenu(Menu menu, int instance) {
// if you want default menu items, uncomment bellow line
// super.makeMenu(menu, instance);
}
But after this, still it was showing the default menu like "Switch Application", for that i have used super(NO_SYSTEM_MENU_ITEMS) in the screen class constructor.
Now all menus are removed, but it is still showing "empty menu" as shown in the image below.
Please let me know how could we remove all menu items and make it empty?
try this in your main screen
public boolean onMenu(int instance) {
// TODO Auto-generated method stub
return false;
}
You can also do that.
public boolean onMenu(int instance) {
return super.onMenu(2);
}
Because for creating menu instance value is 0. So, for any non zero value it doesn't create the menu.
I created for BlackberryMaps a own menu item with help of "MenuItem" and invoke Blackberry Maps. After using this Item the current location (MapView) should be send back to my Application. This works fine.
The problem is I found no solution for closing the app after using the menu Item. Is there a possibility to close Blackberry Maps? Or set my own App to foreground?
private static class MapMenuItem extends ApplicationMenuItem {
//creates a new MenuItem for Blackberry Maps and defines the action which should //happen after a click on the MenuItem
CustomDialog_GPS customDialogGps;
StartScreen startScreen;
MapMenuItem(StartScreen startScreen, CustomDialog_GPS customDialogGps) {
super(20);
this.startScreen = startScreen;
this.customDialogGps = customDialogGps;
}
public String toString() {
//creates the name for the navigation Menu
String itemName = ""+_res.getString(CUSTOMDIALOG_GPS_USE_AS_NEW_LOCATION);
return itemName;
}
public Object run(Object context) {
//defines what should happen after a click on the menu
//get the location at which the cursor is pointing at.
MapView mv = (MapView)context;
if (mv != null) {
//opens a method inside of CustomDialogGPS which handles the latitude and longitude
customDialogGps.saveAdjustedPosition(mv);
//TODO pop Screen
//Screen screen = (Screen)UiApplication.getUiApplication().getActiveScreen();
}
else {
throw new IllegalStateException("Context is null, expected a MapView instance");
}
return null;
}
}
Unfortunately you can't close another app programmatically (Actually you can if you know where is menu item to close for example) but you can foreground your app UiApplication.getApplication().requestForeground(). What is probably appropriate solution for you.
Instead of passing the user to the Maps application, which is outside your app and you have no control over it, create your own screen with a MapField in it. Using your own screen and perhaps extending the MapField class to override functions if needed, allows you to go back to the previous screen once the user selects a location.
I started writing a bb app with a menu.
My problem is I don't know how to react if the selected item is clicked. The menu contains some fields in a VerticalFieldManager that is added in a class that extends MainScreen.
I'm sorry for asking such basic stuff, but i googled 1.5 hours now and didnt find a solution or example, Its my very first blackberry app.
Here you go.
This snippet of code defines a new menu item, with a constructor where you specify the label of the menu item and its position on the menu, and a run method which is called when the user clicks on your menu item.
The run method is called on the UI (event) thread, so you are free to update your user interface components from here, or do whatever else you need to do.
I also included a snippet of a screen class that adds the menu item to its menu.
final class MyMenuItem extends MenuItem
{
MyMenuItem()
{
super("Menu item text", 100000, 0);
}
public void run()
{
// The user has clicked on the menu item, and
// this method was called. Do what you need to do.
}
}
final class MyScreen extends MainScreen
{
// ...
protected void makeMenu ( Menu menu, int instance )
{
// let the system build a default menu first
super.makeMenu(menu, instance);
// add your menu item to the screen
menu.add ( new MyMenuItem() );
}
// ...
}
I have requirement for having onscreen navigation buttons along with menu items on blackberry. I need to generate menu item commands as onscreen buttons. Is there a way to generate onscreen menu item buttons in Blackberry? i.e On each screen of my application the menu items should be populated as onscreen buttons both having same functionality?
Thank you
The easiest way to accomplish what you're trying to do is write one function then have both the button and the menu item use the same function.
For example:
function doSomething() {
// Your Code Here
}
// In the function building your screen
MenuItem somethingMi = new MenuItem() {
private MenuItem() { super("Do Something",100001, 5); }
public void run() { doSomething() };
}
Button somethingBtn = new ButtonField("Do Something");
somethingBtn.setChangeListener(new FieldChangeListener() {
public void fieldChanged(Field field, int context){
doSomething();
}
}
addMenuItem(somethingMI);
add(somethingBtn);
I am using NullField() in one of my screen so that the default focus should not be on any of the button . but when i am clicking on the screen where no field is there , menu screen is being displayed. i dont want that menu screen to be poped up tough it should open when i click menu button.
Thanks alot
override method.
protected boolean navigationClick(int status, int time) {
Field focus = UiApplication.getUiApplication().getActiveScreen()
.getLeafFieldWithFocus();
if (focus instanceof NullField) {
return true;
}
return super.navigationClick(status, time);
}
Note:This code is only for giving you hint.