Reduce space between 2 buttons in HorizontalFieldManager in BlackBerry

问题

In Blackberry I have created a horizontal field manager and added some buttons of small size to it to display toolbar at the bottom of the screen. But my problem is there is too much space between the 2 buttons.

I have to reduce this space between 2 buttons so that I can manage to place at least 6 buttons at the bottom of the screen. I am using the BFmsg.setMargin(305,0,0,40) statement.

Following is my code :

BFcontacts = new ButtonField("Cnt")
    { 
      protected void paint(Graphics graphics) 
         {
        //Bitmap contactsbitmap = Bitmap.getBitmapResource("contacts.jpg");
             //graphics.drawBitmap(0, 0, contactsbitmap.getWidth(), contactsbitmap.getHeight(), contactsbitmap, 0, 0);
             graphics.setColor(Color.WHITE);
             graphics.drawText("Cnt",0,0);
         }
    };


    BFcontacts.setMargin(305,0,0,10);//vertical pos,0,0,horizontal pos
    HFM.add(BFcontacts);

    BFmsg = new ButtonField("Msgs")
    { 
      protected void paint(Graphics graphics) 
         {
        //Bitmap msgsbitmap = Bitmap.getBitmapResource("messages.jpg");
             //graphics.drawBitmap(0, 0, msgsbitmap.getWidth(), msgsbitmap.getHeight(), msgsbitmap, 0, 0);
             graphics.setColor(Color.WHITE);
             graphics.drawText("Msgs",0,0);
         }
    };


    BFmsg.setMargin(305,0,0,40);//vertical pos,0,0,horizontal pos : original
    HFM.add(BFmsg);

   add(HFM)

回答1:

have u tried using custom manager u can place the contents as per ur choice like this

Create object of this class and add items to it

class BottomManager extends Manager
     {
         BottomManager()
         {
             super(Manager.NO_VERTICAL_SCROLL);
         }
         protected void sublayout(int width, int height) 
         {
             Field field = getField(0);
             layoutChild(field,Display.getWidth(), Display.getHeight());
             setPositionChild(field,0,0);

             field = getField(1);
             layoutChild(field,Display.getWidth(), Display.getHeight());
             setPositionChild(field,10+getField(0).getWidth(),0);

             field = getField(2);
             layoutChild(field,Display.getWidth(), Display.getHeight());
             setPositionChild(field,10+getField(1).getWidth(),0);

             field = getField(3);
             layoutChild(field,Display.getWidth(), Display.getHeight());
             setPositionChild(field,getField(2).getWidth()+10,0);

             setExtent(Display.getWidth(), 40);
         }
     }

回答2:

setMargin(305,0,0,40) // = TOP, RIGHT, BOTTOM, LEFT

The margin is relative to the nearest object of the value specified.

So simply reducing the left value from 40 to something smaller should allow you to fit more objects in the horizontal field.

Possibly you will want to take the (Display.getWidth() - (button.getWidth()*numButtons))/numButtons+1 to calculate even left margin spacing.

回答3:

I am not sure if i understand your question fully. but if you place all your buttons in HorizontalFieldManager they will all try to fit in one row now you can set margin for your HorizontalFieldManager to show at bottom or at certain x y position. and then add this Manager to your HFM

来源：https://stackoverflow.com/questions/4505933/reduce-space-between-2-buttons-in-horizontalfieldmanager-in-blackberry

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blackberry

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