j2me智能手机实现远程监控室内操作(低级界面篇) -优快云博客

本文链接：https://blog.youkuaiyun.com/zryStar/article/details/3020026
本文介绍了一个基于Java ME平台的视频监视系统实现方案。该系统利用定时任务每隔两秒从服务器获取一次图片更新，并通过定制的类处理图像显示及界面刷新。文章详细描述了VideoTimer类如何实现定时获取图片及VideoCatch类如何负责图像展示。
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 import java.io.IOException;
import java.util.TimerTask;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import HttpConnection.HttpImageThread;
import HttpConnection.HttpStringThread;
/************************************************************
 * Filename: VideoTimer.java
 * @author Administrator
 * Description: 监视模块的计时器，用于隔2秒获取一次访问图片，并显示到界面上
 */
public class VideoTimer extends TimerTask{
    VideoCatch cc;
    Aurine_Phone4N72 midlet;
    public int count;
    public VideoTimer(VideoCatch cc,Aurine_Phone4N72 midlet){
        this.cc=cc;
        this.midlet=midlet;
        count=0;
    }
    public void setcount(){
        this.count=0;
    }
    public void run() {
        // TODO 自动生成方法存根
        /*
        String resURL="wap2.a-ihome.com/VideoContent.aspx?TerminalNO="+midlet.terno
        +"&AreaNO="+midlet.areano;
        HttpStringThread hst=new HttpStringThread(resURL,midlet,"VideoTimer");
        Thread th=new Thread(hst);
        th.start();
        */
        System.out.println(count);
        count++;
        String resURL="wap2.a-ihome.com/Image/"+midlet.areano+"-"+midlet.terno+"-Video.jpg";
        HttpImageThread hit=new HttpImageThread(resURL,midlet,"VideoImage");
        Thread th2=new Thread(hit);
        th2.start();
        
        
        /*
        if(this.count>25){
            
            midlet.timer.cancel();
            midlet.videotimer.cancel();
            System.out.println("123");
            try {
                midlet.videocatch.image=Image.createImage("/11.png");
            } catch (IOException e) {
                // TODO 自动生成 catch 块
                e.printStackTrace();
            }
            //midlet.videocatch.addCommand(midlet.back);
            midlet.videocatch.repaint();
            midlet.videocatch.serviceRepaints();
            
            //midlet.gotoCanvas(midlet.videocatch);
            //this.count=0;
            System.out.println("123");
            
        }
        */
    }
    /**  
     * 图像放缩方法  
     * @param srcImage 原始的Image对象  
     * @param newW 放缩后的Image的宽度  
     * @param newH 放缩后的Image的高度  
     * @return 放缩后的Image对象  
     */  
    public  final Image scale (Image srcImage, int newW, int newH) {  
           int srcW = srcImage.getWidth();  
           int srcH = srcImage.getHeight();  
           //先做水平方向上的伸缩变换  
           Image tmp = Image.createImage(newW, srcH);
           Graphics g = tmp.getGraphics();  
           for (int x = 0; x < newW; x++) {  
                  g.setClip(x, 0, 1, srcH);  
                  //按比例放缩  
                  g.drawImage(srcImage,x-x*srcW/newW,0,Graphics.LEFT |Graphics.TOP);
           }  
           //再做垂直方向上的伸缩变换  
           Image dst = Image.createImage(newW, newH);  
           g = dst.getGraphics();  
           for (int y = 0; y < newH; y++) {  
                  g.setClip(0, y, newW, 1);  
                  //按比例放缩  
                  g.drawImage(tmp,0,y-y*srcH/newH,Graphics.LEFT | Graphics.TOP);
           }  
           return dst;
    }
}
import java.io.IOException;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
/***************************************************************
 * Filename: VideoCatch.java
 * @author Administrator
 * Description: 监视界面，用于开启、停止监视
 */
public class VideoCatch extends Canvas{
    Image image;
    Image img;
    String result;
    int issuccess;
    int action;
    boolean ischeck;
    int count=0;
    public VideoCatch(){
        //      全屏显示
        setFullScreenMode(true);
        issuccess=0;
        action=0;
        ischeck=true;
        try {
            image=Image.createImage("/11.png");
            img=Image.createImage("/10-3-1.png");
        } catch (IOException e) {
            // TODO 自动生成 catch 块
            e.printStackTrace();
        }
    }
    protected void paint(Graphics g) {
        // TODO 自动生成方法存根
        //      清理画布，底色转为白色。
        g.setColor(255, 255, 255);
        g.fillRect(0, 0,this.getWidth() , this.getHeight());
        Font font2=Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD,
                Font.SIZE_SMALL);
        g.setFont(font2);
        Font font=g.getFont();
        //      画入顶图片
        g.drawImage(img, this.getWidth()/2, 15, Graphics.HCENTER|Graphics.VCENTER);
        g.setColor(0, 0, 0);
        if(image==null){
            
        }else{
            g.drawImage(image,0,30,Graphics.LEFT|Graphics.TOP);
        }
        if(issuccess==-1){
            if(action==1){
                g.setColor(255, 255, 255);
                g.fillRect(30, this.getHeight()/2-40, this.getWidth()-60, 70);
                g.setColor(0, 0, 0);
                g.drawRect(30, this.getHeight()/2-40, this.getWidth()-60, 70);
                g.setColor(8, 140, 201);
                g.fillRect(30, this.getHeight()/2-40, this.getWidth()-60, 20);
                g.setColor(0, 0, 0);
                g.drawString("错误", 30+5, this.getHeight()/2-40+10-(font.getHeight()>>1),
                        Graphics.LEFT|Graphics.TOP);
                g.drawString("OK", this.getWidth()-16-30, this.getHeight()/2-40+10-(font.getHeight()>>1),
                        Graphics.LEFT|Graphics.TOP);
                g.drawString("开启监视失败。", this.getWidth()/2, this.getHeight()/2-(font.getHeight()>>1),
                        Graphics.HCENTER|Graphics.TOP);
            }
            else if(action==-1){
                g.setColor(255, 255, 255);
                g.fillRect(30, this.getHeight()/2-40, this.getWidth()-60, 70);
                g.setColor(0, 0, 0);
                g.drawRect(30, this.getHeight()/2-40, this.getWidth()-60, 70);
                g.setColor(8, 140, 201);
                g.fillRect(30, this.getHeight()/2-40, this.getWidth()-60, 20);
                g.setColor(0, 0, 0);
                g.drawString("错误", 30+5, this.getHeight()/2-40+10-(font.getHeight()>>1),
                        Graphics.LEFT|Graphics.TOP);
                //亮蓝色框
                g.fillRect(this.getWidth()-48, this.getHeight()/2-40+2, 16, 16);
                g.setColor(0, 0, 0);
                g.drawString("OK", this.getWidth()-16-30, this.getHeight()/2-40+10-(font.getHeight()>>1),
                        Graphics.LEFT|Graphics.TOP);
                g.drawString("关闭监视失败。", this.getWidth()/2, this.getHeight()/2-(font.getHeight()>>1),
                        Graphics.HCENTER|Graphics.TOP);
            }
        }
        if(ischeck==false){
            g.setColor(255, 255, 255);
            g.fillRect(30, this.getHeight()/2-40, this.getWidth()-60, 70);
            g.setColor(0, 0, 0);
            g.drawRect(30, this.getHeight()/2-40, this.getWidth()-60, 70);
            g.setColor(8, 140, 201);
            g.fillRect(30, this.getHeight()/2-40, this.getWidth()-60, 20);
            g.setColor(0, 0, 0);
            g.drawString("错误", 30+5, this.getHeight()/2-40+10-(font.getHeight()>>1), Graphics.LEFT|Graphics.TOP);
            g.drawString("OK", this.getWidth()-16-30, this.getHeight()/2-40+10-(font.getHeight()>>1),
                    Graphics.LEFT|Graphics.TOP);
            g.drawString("验证码错误。", this.getWidth()/2, this.getHeight()/2-(font.getHeight()>>1),
                    Graphics.HCENTER|Graphics.TOP);
        }else{
            
        }
    }
    protected void keyPressed(int k){
        if(k==-5){
            if(ischeck==true){
                issuccess=0;
                action=0;
                try {
                    image=Image.createImage("/11.png");
                } catch (IOException e) {
                    // TODO 自动生成 catch 块
                    e.printStackTrace();
                }
                repaint();
                this.serviceRepaints();
            }
            else {
                ischeck=true;
                repaint();
                serviceRepaints();
            }
        }
    }
}
 