不顯示結果

Question

這裏是我的代碼，並且通過源代碼不可用異常。在代碼中，我們需要顯示的彈出屏幕，但不顯示平均速度的值。

class popUpScreen extends PopupScreen 
{ 
    private EditField _sp; 
    // Speed s = new Speed(); 
    //public double _averageSpeed =s._averageSpeed ; 
    StringBuffer sb = new StringBuffer(); 
    popUpScreen() 
    { 
     super(new VerticalFieldManager(),Field.FOCUSABLE); 

     Speed s = new Speed(); 
     double _averageSpeed =s._averageSpeed ; 

     _sp = new EditField(" The Average Speed is: ",""+_averageSpeed); 
     add(_sp); 
     //Speed._averageSpeed=sb.; 
     //sb.append("\n_averageSpeed : "); 
     //sb.append(_averageSpeed); 
    } 
} 

Answer 1

您應該保存您傳遞給super的VerticalFieldManager;將您的標籤添加到經理。

沒有必要覆蓋整個班級，你可以這樣做：

DialogFieldManager dfm = new DialogFieldManager(); 
dfm.add(_sp); 
PopupScreen popUpScreen = new BasePopupScreen(dfm, Manager.VERTICAL_SCROLL);