SearchField专注于黑莓手机

Question

如何将默认焦点设置为搜索字段？当搜索结果出现时，我想将默认焦点设置为搜索结果列表中的第一项。 这是代码：

final static  class CustomKeywordField extends BasicEditField
{   

    CustomKeywordField()
    {
        // Custom style.
        super(USE_ALL_WIDTH|NON_FOCUSABLE|NO_LEARNING|NO_NEWLINE); 

        setLabel("Search: ");
    } 

    /**
     * Intercepts ESCAPE key.
     * @see net.rim.device.api.ui.component.TextField#keyChar(char,int,int)
     */
    protected boolean keyChar(char ch, int status, int time)
    {
        switch(ch)
        {
            case Characters.ESCAPE:
                // Clear keyword.
                if(super.getTextLength() > 0)
                {
                    setText("");                        
                    return true;
                }
        }                
        return super.keyChar(ch, status, time);
    }                     

    /**
     * Overriding super to add custom painting to our class.
     * @see net.rim.device.api.ui.Field#paint(Graphics)
     */
    protected void paint(Graphics graphics)
    {            
        super.paint(graphics);

        // Draw caret.
        getFocusRect(new XYRect());
        drawFocus(graphics, true);                          
    }
}