블랙 베리 - 하위 메뉴를 만드는 방법?

Question

BB 응용 프로그램 에 대한 하위 메뉴를 만들고 싶습니다.

Option 1 
Option 2 
Option 3 

옵션 3을 클릭하면

1 
2 
3 

가 하위 메뉴 항목으로 표시됩니다 ..

x2x + eclipse

을 사용하여

Answer 1

항상
alt text http://img380.imageshack.us/img380/3874/menugy.jpg

class Scr extends MainScreen { 
    SubMenu menu = new SubMenu(); 

    public Scr() { 

     for (int i = 0; i < 3; i++) { 
      SubMenu sMenu = new SubMenu(); 
      menu.add(new SubMenuItem(i + " item", sMenu)); 
      for (int k = 0; k < 3; k++) { 
       SubMenu sSMenu = new SubMenu(); 
       sMenu.add(new SubMenuItem(i + "-" + k + " item", sSMenu)); 
       for (int l = 0; l < 3; l++) { 
        sSMenu 
          .add(new SubMenuItem(i + "-" + k + "-" + l 
            + " item")); 
       } 
      } 
     } 

     add(new LabelField("testing menu", FOCUSABLE) { 
      protected void makeContextMenu(ContextMenu contextMenu) { 
       menu.mRectangle.x = this.getContentRect().X2(); 
       menu.mRectangle.y = this.getContentRect().Y2(); 
       Ui.getUiEngine().pushScreen(menu); 

       EventInjector.invokeEvent(new KeyEvent(KeyEvent.KEY_DOWN, 
         Characters.ESCAPE, 0)); 
      } 
     }); 
    } 
} 

class SubMenu extends PopupScreen implements ListFieldCallback { 
    private static final int MAX_WIDTH = Font.getDefault().getAdvance(
      "max menu item text"); 
    XYRect mRectangle = new XYRect(); 
    Vector mSubMenuItems = new Vector(); 
    ListField mListField; 

    public SubMenu() { 
     super(new SubMenuItemManager(), DEFAULT_CLOSE); 
     int rowHeight = getFont().getHeight() + 2; 
     mListField = new ListField() { 
      protected boolean navigationClick(int status, int time) { 
       runMenuItem(getSelectedIndex()); 
       return super.navigationClick(status, time); 
      } 
     }; 
     mListField.setRowHeight(rowHeight); 
     add(mListField); 
     mListField.setCallback(this); 
     updateMenuItems(); 
    } 

    public void add(SubMenuItem subMenuItem) { 
     mSubMenuItems.addElement(subMenuItem); 
     subMenuItem.mMenu = this; 
     updateMenuItems(); 
    } 

    private void updateMenuItems() { 
     int rowCounts = mSubMenuItems.size(); 
     mRectangle.width = getMaxObjectToStringWidth(mSubMenuItems); 
     mRectangle.height = mListField.getRowHeight() * rowCounts; 
     mListField.setSize(rowCounts); 
    } 

    private void runMenuItem(int index) { 
     SubMenuItem item = (SubMenuItem) get(mListField, index); 
     if (null != item.mSubMenu) { 
      item.mSubMenu.setSubMenuPosition(getSubMenuRect(index)); 
      Ui.getUiEngine().pushScreen(item.mSubMenu); 
     } else { 
      item.run(); 
     } 
    } 

    private XYRect getSubMenuRect(int index) { 
     SubMenuItem item = (SubMenuItem) get(mListField, index); 
     XYRect result = item.mSubMenu.mRectangle; 
     result.x = mRectangle.x + mRectangle.width; 
     result.y = mRectangle.y + mListField.getRowHeight() * index; 
     int testWidth = Display.getWidth() - (mRectangle.width + mRectangle.x); 
     if (testWidth < result.width) { 
      result.width = testWidth; 
     } 

     int testHeight = Display.getHeight() 
       - (mRectangle.height + mRectangle.y); 
     if (testHeight < result.height) 
      result.height = testHeight; 

     return result; 
    } 

    public void setSubMenuPosition(XYRect rect) { 
     mRectangle = rect; 
    } 

    protected void sublayout(int width, int height) { 
     super.sublayout(mRectangle.width, mRectangle.height); 
     setPosition(mRectangle.x, mRectangle.y); 
     setExtent(mRectangle.width, mRectangle.height); 
    } 

    private int getMaxObjectToStringWidth(Vector objects) { 
     int result = 0; 
     for (int i = 0; i < objects.size(); i++) { 
      int width = getFont().getAdvance(objects.elementAt(i).toString()); 
      if (width > result) { 
       if (width > MAX_WIDTH) { 
        result = MAX_WIDTH; 
        break; 
       } else { 
        result = width; 
       } 
      } 
     } 
     return result; 
    } 

    public void drawListRow(ListField field, Graphics g, int i, int y, int w) { 
     // Draw the text. 
     String text = get(field, i).toString(); 
     g.setColor(Color.WHITE); 
     g.drawText(text, 0, y, DrawStyle.ELLIPSIS, w); 
    } 

    public Object get(ListField listField, int index) { 
     return mSubMenuItems.elementAt(index); 
    } 

    public int getPreferredWidth(ListField listField) { 
     return mRectangle.width; 
    } 

    public int indexOfList(ListField listField, String prefix, int start) { 
     return 0; 
    } 
} 

class SubMenuItemManager extends VerticalFieldManager { 
    public SubMenuItemManager() { 
     super(USE_ALL_HEIGHT | USE_ALL_WIDTH); 
    } 

    public int getPreferredWidth() { 
     return ((SubMenu) getScreen()).mRectangle.width; 
    } 

    public int getPreferredHeight() { 
     return ((SubMenu) getScreen()).mRectangle.height; 
    } 

    protected void sublayout(int maxWidth, int maxHeight) { 
     maxWidth = getPreferredWidth(); 
     maxHeight = getPreferredHeight(); 
     super.sublayout(maxWidth, maxHeight); 
     setExtent(maxWidth, maxHeight); 
    } 

} 

class SubMenuItem implements Runnable { 
    String mName; 
    SubMenu mMenu; 
    SubMenu mSubMenu; 

    public SubMenuItem(String name) { 
     this(name, null); 
    } 

    public SubMenuItem(String name, SubMenu subMenu) { 
     mName = name; 
     mSubMenu = subMenu; 
    } 

    public String toString() { 
     return mName; 
    } 

    public void run() { 

    } 
} 

Answer 2

서브 메뉴를 일식 사용

는 표준 BlackBerry API의 일부가 아닙니다. 이렇게하려면 사용자 정의 메뉴 + 하위 메뉴 컨트롤을 만들어야합니다.