对话框创作黑莓 [英] Dialog creation in Blackberry

问题描述

您好，我想创建具有用户名和密码登录屏幕
在按钮登录
但是，当用户没有输入用户名或密码的文本字段内正确的信息弹出一个喜欢的形象聊天对话框应显示相应的消息如何解决这个定制可以实现从文本域的右侧角落弹出？

Hi, I want to create a Login Screen which has a Username and Password and a Sign in Button But when a user fails to enter correct information inside the TextField of Username or Password a pop up like the image chat dialog should pop up from corner of TextField's right side displaying appropriate message How can this Customization be achieved?

推荐答案

我给你一个简单的方法。如果不是完美你的问题，你就忽略这个答案。

i am giving you a simple way. If it is not perfect to your question you just ignore this answer.

下面我做了类似的逻辑如下。我给你两个按钮
1）登录
2）删除

Here i made logic like following. i gave you two buttons 1)Login 2)remove

我想你知道如何验证文本字段正确或错误;保留一个if条件，写你的逻辑，如果正确不需要任何领域
 别人错了，那么你具备三个条件

I think you know how to validate your text fields right or wrong; keep one if condition ,write your logic if right no need any field else wrong then you have three conditions

1），id是错误的
2）密码错误
或3）都错了

1)id is wrong 2)password is wrong or 3)both wrong

根据两块条件可以在上面的文本字段中添加特定的提示框。

according two that condition you can add particular tooltip box on above text field .

我为错误的条件提供样品，并删除条件

I am providing sample for both wrong condition and remove condition also

使其作为您的要求。

资源：

需要chat.png图像背景

chat.png image is required for background

样品code：

package mypackage;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.XYEdges;
import net.rim.device.api.ui.component.BasicEditField;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.container.VerticalFieldManager;
import net.rim.device.api.ui.decor.Border;
import net.rim.device.api.ui.decor.BorderFactory;

/**
 * A class extending the MainScreen class, which provides default standard
 * behavior for BlackBerry GUI applications.
 */
public final class MyScreen extends MainScreen implements FieldChangeListener
{
    /**
     * Creates a new MyScreen object
     */
    private BasicEditField id,password;
    private ButtonField login,cancel;
    private  VerticalFieldManager id_mgr,pass_mgr;
    private PopupField id_hint,pass_hint;
    public static Bitmap img;
    public MyScreen()
    { 
        img=Bitmap.getBitmapResource("chat.png");
        // Set the displayed title of the screen       
        setTitle("Login Page");
        Border b=BorderFactory.createRoundedBorder(new XYEdges(5, 5, 5, 5), Border.STYLE_SOLID);
        id_hint=new PopupField("Wrong Id", img);

        pass_hint=new PopupField("Wrong password", img);
        id_mgr=new VerticalFieldManager();

        id=new BasicEditField(){
            protected void layout(int width, int height) {
                super.layout(120, 40);
                setExtent(120, 40);

            }
        };
        id.setBorder(b);
        add(id_mgr);
        add(id);
        pass_mgr=new VerticalFieldManager();
        password=new BasicEditField(){
            protected void layout(int width, int height) {
                super.layout(120, 40);
                setExtent(120, 40);

            }
        };
        password.setBorder(b);
        add(pass_mgr);
        add(password);



        login=new ButtonField("Login");
        login.setChangeListener(this);
        add(login);

        cancel=new ButtonField("Remove");
        cancel.setChangeListener(this);
        add(cancel);

    }
    public void fieldChanged(Field field, int context) {
        if(field==login)
        {
            try {
//              id_mgr.add(new NullField(Field.FOCUSABLE));
                id_mgr.add(id_hint);
                id_mgr.setPadding(0, 0, 0, 50);
                pass_mgr.add(pass_hint);
                pass_mgr.setPadding(0, 0, 0, 50);
                id_hint.setFocus();
            } catch (IllegalStateException e) {
                return;
            }
        }else if(cancel==field)
        {
            synchronized (UiApplication.getEventLock()) {
                id_mgr.deleteAll();
                pass_mgr.deleteAll();
            }
        }

    }
}

和类PopupField.java是

and class for PopupField.java is

package mypackage;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.BitmapField;

public class PopupField extends BitmapField{
    private  Bitmap img,scalled_img;
    private String message;
    private int layout_width;

    public PopupField(String message,Bitmap img)
    {
        this.message=message;
        layout_width=this.getFont().getAdvance(message)+40;
        scalled_img=new Bitmap(layout_width, img.getHeight());
        img.scaleInto(scalled_img, Bitmap.FILTER_BILINEAR);
        this.img=scalled_img;
    }

    protected void layout(int width, int height) {

        super.layout(img.getWidth(), img.getHeight());
        setExtent(img.getWidth(), img.getHeight());

    }

    protected void paint(Graphics graphics) {
        graphics.drawBitmap(0, 0, img.getWidth(), img.getHeight(), img,0,0);
        graphics.setColor(Color.RED);
        graphics.drawText(message,20,20);
        super.paint(graphics);
    }

}

输出图像：

output image :

继续帮助他人

其他的解决办法是这个链接会告诉你
HTTP：//v4ks1n.word$p$ pss.com/2011/01/28/tool​​tips-class-for-blackberry/

Other solution is this link will tell you http://v4ks1n.wordpress.com/2011/01/28/tooltips-class-for-blackberry/

这篇关于对话框创作黑莓的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！