Tab bar in blackberry without ToolBarManager

by

This is a sample code that how to create Tabs in blackberry.
I had total 3 screens after statUp(which extends UiApplication) class

  1. LoadingScreen.java

    public class LoadingScreen extends MainScreen
{   
int current_index=0;
BottomPanel bottomPanel;
public LoadingScreen(int current_index)
{   
   this.current_index=current_index;
   bottomPanel=new BottomPanel(current_index);
}

public  void createGUI() 
{       
setTitle("Loading Screen");

VerticalFieldManager vertical=new VerticalFieldManager(USE_ALL_WIDTH)
{
    protected void sublayout(int maxWidth, int maxHeight) 
    {               
        super.sublayout(Display.getWidth(), 150);
        setExtent(Display.getWidth(), 150);
    }
};
vertical.setBackground(BackgroundFactory.createSolidBackground(Color.GREEN));
ButtonField button=new ButtonField("Click");
vertical.add(button);       
add(vertical);

setStatus(bottomPanel);     
}
}

  2. BottomPanel.java

    public class BottomPanel extends VerticalFieldManager implements FieldChangeListener 
{
   Bitmap news_bit=Bitmap.getBitmapResource("news.png");//these images are cutting according to device requirement;
   Bitmap news_bit_hover=Bitmap.getBitmapResource("news_h.png");
   Bitmap settings_bit=Bitmap.getBitmapResource("settings.png");
   Bitmap settings_bit_hover=Bitmap.getBitmapResource("settings_h.png");
   Bitmap about_bit=Bitmap.getBitmapResource("about.png");
   Bitmap about_bit_hover=Bitmap.getBitmapResource("about_h.png");
   PictureBackgroundButtonField news_pic,settings_pic,about_pic;
   HorizontalFieldManager hr;
   int current_index=0;
   public BottomPanel(int current_index)
   {        
   super(FOCUSABLE);
   this.current_index=current_index;
  VerticalFieldManager ver=new VerticalFieldManager(USE_ALL_WIDTH|USE_ALL_HEIGHT)
  {         
    protected void sublayout(int width, int height) 
    {
        super.sublayout(width, news_bit.getHeight());
        setExtent(width, news_bit.getHeight());
    }
};
hr=new HorizontalFieldManager(FIELD_HCENTER);
if(current_index==1)
{
    news_pic=new PictureBackgroundButtonField(news_bit.getWidth(),news_bit.getHeight(), Field.NON_FOCUSABLE|Field.FIELD_VCENTER, news_bit_hover, news_bit_hover);
}
else
{
    news_pic=new PictureBackgroundButtonField(news_bit.getWidth(),news_bit.getHeight(), Field.FOCUSABLE|Field.FIELD_VCENTER, news_bit, news_bit_hover);
}
news_pic.setChangeListener(this);
hr.add(news_pic);

if(current_index==2)
{
    settings_pic=new PictureBackgroundButtonField(settings_bit.getWidth(),settings_bit.getHeight(), Field.NON_FOCUSABLE|Field.FIELD_VCENTER, settings_bit_hover, settings_bit_hover);
}
else
{
    settings_pic=new PictureBackgroundButtonField(settings_bit.getWidth(),settings_bit.getHeight(), Field.FOCUSABLE|Field.FIELD_VCENTER, settings_bit, settings_bit_hover);
}
settings_pic.setChangeListener(this);
hr.add(settings_pic);

if(current_index==3)
{
    about_pic=new PictureBackgroundButtonField(about_bit.getWidth(),about_bit.getHeight(),Field.NON_FOCUSABLE|Field.FIELD_VCENTER, about_bit_hover, about_bit_hover);
}
else
{
    about_pic=new PictureBackgroundButtonField(about_bit.getWidth(),about_bit.getHeight(), Field.FOCUSABLE|Field.FIELD_VCENTER, about_bit, about_bit_hover);
}
about_pic.setChangeListener(this);
hr.add(about_pic);

ver.add(hr);
add(ver);
}

public void fieldChanged(Field field, int context) 
{           
if(field==news_pic)
{               
    LoadingScreen loadingScreen=new LoadingScreen(1);
    UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
    UiApplication.getUiApplication().pushScreen(loadingScreen);
    loadingScreen.createGUI();
}
else if(field==settings_pic)
{
    LoadingScreen loadingScreen=new LoadingScreen(2);
    UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
    UiApplication.getUiApplication().pushScreen(loadingScreen);
    loadingScreen.createGUI();
}
else if(field==about_pic)
{
    LoadingScreen loadingScreen=new LoadingScreen(3);
    UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
    UiApplication.getUiApplication().pushScreen(loadingScreen);
    loadingScreen.createGUI();
}       
}
}

  3. PictureBackgroundButtonField.java

    public class PictureBackgroundButtonField extends Field 
{       
    private String _label;
    private int _labelHeight;
    private int _labelWidth;
    private Font _font;

    private Bitmap _currentPicture;
    private Bitmap _onPicture ;
    private Bitmap _offPicture ;
    public PictureBackgroundButtonField(int width,int height, long style, Bitmap picture, Bitmap selectedPic) 
    {
        super(style);

       _font = getFont();
       _label = "";
      _labelHeight = height;
      _labelWidth = width;
      _currentPicture = picture;
      _onPicture = selectedPic;
      _offPicture = picture;        
   }
   public int getPreferredHeight() 
   {
       return _labelHeight;
   }
   public int getPreferredWidth() 
   {
       return _labelWidth;
   }
   protected void onFocus(int direction) 
   {
       _currentPicture = _onPicture;
       invalidate();
   }
   protected void onUnfocus() 
   {
        _currentPicture = _offPicture;
        invalidate();
   }
   protected void drawFocus(Graphics graphics, boolean on) 
   {
        // Do nothing
   }
   protected void layout(int width, int height) 
   {
       setExtent( getPreferredWidth(), getPreferredHeight());
   }
   protected void paint(Graphics graphics) 
   {            
           graphics.drawBitmap(0, 0, getPreferredWidth(), getPreferredHeight(), _currentPicture, 0, 0);     
           graphics.setFont(_font);
           graphics.drawText(_label, 4, 2, 
    (int)( getStyle() & DrawStyle.ELLIPSIS | DrawStyle.HALIGN_MASK ),
    getWidth() - 6 );
  }
  protected boolean navigationClick(int status, int time) 
  {
         fieldChangeNotify(1);
         return true;
  }    
}

Try this code and see the difference;

Leave a Comment

tech