BlackBerry - RadioButtonField，选择时隐藏边框

Question

我有一个带有两个RadioButtonField对象的屏幕。默认情况下，第一个RadioButtonField将显示一个矩形以显示其所选内容，如果将所选内容更改为另一个RadioButtonField或页面上的其他按钮和文本框，矩形将移动。我想知道的是...有没有办法隐藏显示选择/边框的边框？

Answer 1

，如果你在4.6及更高版本，尝试setBorder()没有边缘：

alt text http://img139.imageshack.us/img139/672/rbnoborder.jpg

class Scr extends MainScreen { 
    EditField editField = new EditField("edit field", "text"); 
    RadioButtonGroup rbGroup = new RadioButtonGroup(); 
    RadioButtonField rbField = new RadioButtonField("First field"); 
    RadioButtonField rbField2 = new RadioButtonField("Second field"); 
    ButtonField buttonField = new ButtonField("button"); 
    Border invisibleBorder = 
     BorderFactory.createSimpleBorder(new XYEdges(0,0,0,0));  
    public Scr() { 
     add(editField); 
     rbGroup.add(rbField); 
     rbGroup.add(rbField2); 
     add(rbField); 
     add(rbField2);  
     add(buttonField);  
     editField.setBorder(invisibleBorder); 
     rbField.setBorder(invisibleBorder); 
     rbField2.setBorder(invisibleBorder);   
     buttonField.setBorder(invisibleBorder);    
    } 
} 

如果在4.5和更低，尽量覆盖drawFocus()，让它空：

alt text http://img214.imageshack.us/img214/672/rbnoborder.jpg

class Scr extends MainScreen { 
    EditField editField = new EditField("edit field", "text") { 
     protected void drawFocus(Graphics graphics, boolean on) { 
     } 
    }; 
    RadioButtonGroup rbGroup = new RadioButtonGroup(); 
    RadioButtonField rbField = new RadioButtonField("First field") { 
     protected void drawFocus(Graphics graphics, boolean on) { 
     } 
    }; 
    RadioButtonField rbField2 = new RadioButtonField("Second field") { 
     protected void drawFocus(Graphics graphics, boolean on) { 
     } 
    }; 
    ButtonField buttonField = new ButtonField("button") { 
     protected void drawFocus(Graphics graphics, boolean on) { 
     } 
    }; 

    public Scr() { 
     add(editField); 
     rbGroup.add(rbField); 
     rbGroup.add(rbField2); 
     add(rbField); 
     add(rbField2); 
     add(buttonField); 
    } 
} 

Answer 2

您需要覆盖对象的drawFocus方法，方法是对其进行扩展。