没有显示结果

Question

这里是我的代码并且通过源代码不可用异常。在代码中我们需要显示的弹出屏幕，但不显示平均速度的值。

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

你应该保存你传递给super的VerticalFieldManager;将您的标签添加到经理。

没有必要覆盖你可以这样做的整个课程：

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