welcomeui.java

J2ME实现的手机电话本

/*
 * WelcomeUI.java
 *
 * Created on 2006年3月22日, 上午9:24
 *
 * To change this template, choose Tools | Options and locate the template under
 * the Source Creation and Management node. Right-click the template and choose
 * Open. You can then make changes to the template in the Source Editor.
 */

package com.j2medev.sample.phonebook;

import javax.microedition.lcdui.*;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
/**
 *
 * @author Admin
 */
public class WelcomeUI extends Canvas{
    
  private PhoneBookMidlet midlet = null;
   // private Displayable nextUI = null;
    private Image img = null;
    private int width;
    private int height;
    private int y = 0;
    private Timer timer = new Timer();
    private Font font = null;
    private boolean first = true;
    private Displayable dis;
    
    
    
    /** Creates a new instance of SplashCanvas */
    public WelcomeUI(PhoneBookMidlet midlet,Displayable d) {
        this.midlet = midlet;
        this.dis = d;
        width = this.getWidth();
        height = this.getHeight();
        font = Font.getDefaultFont();
        try{
            img = Image.createImage("/logo.png");
        }catch(IOException e){
            e.printStackTrace();
        }
        y = height/2 - img.getHeight()/2;
        
    }
    protected void paint(Graphics g){
        if(first){
            clearBackground(g);
            first = false;
        }
        //设置裁减区域
        g.setClip(0,y, width, 5);
        //绘制图片
        g.drawImage(img, width / 2, height/ 2, Graphics.HCENTER| Graphics.VCENTER);
        //图片绘制完成后就绘画文本
        if(y> (height+img.getHeight())/2){
            g.drawString("正在读取用户登录信息！！", width/2, (height+img.getHeight())/2+font.getHeight(), Graphics.HCENTER|Graphics.TOP);
        }
        
    }
    protected void showNotify(){
        timer.schedule(new TimerTask(){
            public void run() {
                repaint();
                //画完图片和文字后就进入下个UI
                if(y > (height + img.getHeight())/ 2+3*font.getHeight()){
                    //休眠500ms
                    try{
                        Thread.sleep(500);
                    }catch(Exception ex){
                        ex.printStackTrace();
                    }
                    dismiss();
                }
                y = y + 5;
            }
        },0,50);
    }
    private void dismiss(){
        timer.cancel();
        synchronized(midlet){
            midlet.notify();
        }
        //midlet.setCurrent(dis);
    }
    private void clearBackground(Graphics g){
        int color = g.getColor();
        g.setColor(0xffffff);
        g.fillRect(0, 0, width, height);
        g.setColor(color);
    }
    protected void keyPressed(int keyCode){
        dismiss();
    }
    protected void pointerPressed(int x,int y){
        dismiss();
    }
    
}