Question

您好我输入了一段代码，但它似乎不起作用您是否会让我知道错误是什么？

import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FocusChangeListener;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.component.BasicEditField;
import net.rim.device.api.ui.component.EditField;
import net.rim.device.api.ui.container.VerticalFieldManager;


public class CustomTextField extends VerticalFieldManager implements FocusChangeListener{
    private int textWidth=0;
    private Font font=Font.getDefault();
    private int textHeight=0;
    public EditField basicEditField;

    public CustomTextField(int width,int height) {
        textWidth=width;
        textHeight=height;
        VerticalFieldManager vfm=new VerticalFieldManager(Manager.FOCUSABLE);   
        basicEditField=new EditField(null,null,200, Field.EDITABLE|Field.FOCUSABLE|BasicEditField.NO_NEWLINE);

        basicEditField.setFocusListener(this);
        vfm.add(basicEditField);
        add(vfm);
    }


    protected void sublayout(int maxWidth, int maxHeight) {

        if(textWidth==0)
        {
            textWidth=maxWidth;
        }
        if(textHeight==0)
        {
            textHeight=maxHeight;
        }
        super.layout(textWidth, textHeight);
        setExtent(textWidth, textHeight);
    }


    protected void paint(Graphics graphics) {

        graphics.setColor(Color.BLACK);
        graphics.drawRect(basicEditField.getLeft(),basicEditField.getTop(), textWidth, textHeight);

    }



    public void setHeight(int height) {
        textHeight= height;
    }


    public void setWidth(int width) {
        textWidth= width;
    }



    public Font getFont() {
        return font;
    }



    public void setFont(Font font) {
        this.font = font;
    }


    public void focusChanged(Field field, int eventType) {
        if(eventType==FOCUS_GAINED)
        {
            if(field==basicEditField)
            {
                basicEditField.setCursorPosition(basicEditField.getText().length());
            }
        }

    }


}

键入的内容无法在屏幕上显示我刚刚创建了一个CustomTextField，它扩展了VerticalFieldManager 在里面我添加了一个EditField，它将被添加到VerticalFieldManager

中

但它确实无效我的意思是它没有显示我在屏幕上键入的内容你能看出来的错误是什么

我使用

调用CustomTextField

CustomTextField ctf=new CustomTextField(100,200):

Answer 1

检查

protected void paint(Graphics graphics)

添加

super.paint(g);

在它的最后。

CustomTextField（得到StackOverFlow错误）

1 个答案: