IMEI码是"International Mobile Equipment Identity"的缩写，中文的意思是“国际移动设备识别码”，也俗称俗称＂串号＂存储在手机的EEPROM（俗称码片）里，每一个移动设备都对应一个唯一的IMEI。其组成结构为TAC（6位数字）+FAC（两位数字）+ SNR（6位数字）+SP （1位数字）。TAC（设备型号核准号码），由欧洲型号认证中心分配。（和我们网卡的MAC地址很相似）　　
        1.TAC：为设备型号核准号码，代表了手机的型号。各个手机品牌如诺基亚、爱立信或阿尔卡特，只要是同一型号的手机,TAC码一定是一样的，比如说笔者所见的几款阿尔卡特OT301的TAC码就都是332157。现在有不法商贩从广东那里买来旧机拆了机芯装换个壳子当新机卖，我们可以从TAC的差别中寻到其蛛丝马迹，只要你知道该型号手机的正确TAC编码一比较就知道了，因为旧机的型号一般都比较老了不会和现在比较流行的型号一样。　　

        2.FAC：为最后装配号码，代表了手机最后完成装配时是在什么地方，也就是最后装配的工厂在哪个国家或地区，一般不会具体的到哪个厂家，所以这并不是哪个国家制造的代号。不过，我们一般都将最后装配工序完成的工厂所在地当作手机产地,因此，FAC码也可以认为是手机产地的代号。现在各大手机厂商在国内都有自己的生产基地，生产中低档型号是没有问题的，所以你如果在国内买到这些品牌在国外的生产基地生产出来的中低档产品，那么这时候你就要当心一点了。因为国内还没有什么品牌的某款产品出现销售情况俏销至国内来不及生产要进口的状况。为防万一最好将将入网证放在验钞机下进行验证，如果入网证上显示出红色的“CMII”的图案和一个不是很清晰的数字，则为正规入网证，否则可以肯定的判定为是水货的。　　   

        3.SEN：为出厂序列号，代表了手机在手机的在工厂的编号。和其它产品的出厂序号一样，是为厂家的内部管理服务的，对我们一般用户并无多大意义。但是同一个牌子且同一型号的SN是不可能一样的,如果你发现有二支手机的SN是一模一样的话,那么其中一个至少有一个是假货了。
　　4.SPN：为备用号码，一般这个数字是零，当然也不都是，笔者的阿尔卡特OT301就是“4”，而像爱立 信T18SC、T28SC以近的机型在IMEI码最后还加上了两位版本号码，这其实也是正常的，只要前面三个号码没问题这个就可以不管它了。 应用实例。下面列出常见品牌产地代码数值及代表地区(摘自3G365智能手机网S60论坛)　　

诺基亚：48、60、62、80、81、92、93－中国；06、07、08、20－法国；19、40、41、44－英国；10－芬兰；18－新加坡；30－韩国；67、68－美国；（10，70(改版?)：芬兰；20：德国；30：韩国；40：北京；60：东莞。 　　

摩托罗拉： 07、08－德国；18－新加坡；40、41－苏格兰；44－英国；48－香港、东南亚改装机；67－美国；80、81、92、93－中国；68－美洲；06(部分),07,08：德国；17：马来西亚(杭州?)；18：新加坡；40，41：苏格兰；44：英国；47：香港，东南亚改装机；48：大陆改装机；67：美国；68，美洲生产线；80，81，82：天津；92，93：杭州东信。　　

爱立信 19－英国；51－瑞典；61－香港；62－中国；19：英国；42：爱沙尼亚；51：瑞典(南京?)；61：香港；62：北京；71：马来西亚。　　

其他品牌：西门子 37：上海；51：德国；松 下 62：北京；三星 89、90、92：韩国:飞利浦 69：深圳 

下面是在J2ME中获得IMEI的方法：
        1、  MOTO系列的手机可以通过读取系统的IMEI属性获得，代码如下：String imei = System.getProperty("IMEI");
        2、  SIEMENS系列的手机可以通过读取系统的com.siemens.IMEI属性获得，代码如下：String imei = System.getProperty("com.siemens.IMEI");  在涉及到具体开发时，建议大家参考厂家具体的开发文档。

    protected int[] readColorTable(int ncolors) {
        int nbytes = 3 * ncolors;
        int[] tab = null;
        byte[] c = new byte[nbytes];
        int n = 0;
        try {
            n = in.read(c);
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (n < nbytes) {
            status = STATUS_FORMAT_ERROR;
        } else {
            tab = new int[256]; // max size to avoid bounds checks
            int i = 0;
            int j = 0;
            while (i < ncolors) {
                int r = ((int) c[j++]) & 0xff;
                int g = ((int) c[j++]) & 0xff;
                int b = ((int) c[j++]) & 0xff;
                tab[i++] = 0xff000000 | (r << 16) | (g << 8) | b;
            }
        }
        return tab;
    }

   
    protected void readContents() {
        // read GIF file content blocks
        boolean done = false;
        while (!(done || err())) {
            int code = read();
            switch (code) {

                case 0x2C: // image separator
                    readImage();
                    break;

                case 0x21: // extension
                    code = read();
                    switch (code) {
                        case 0xf9: // graphics control extension
                            readGraphicControlExt();
                            break;

                        case 0xff: // application extension
                            readBlock();
                            String app = "";
                            for (int i = 0; i < 11; i++) {
                                app += (char) block[i];
                            }
                            if (app.equals("NETSCAPE2.0")) {
                                readNetscapeExt();
                            } else {
                                skip(); // don't care
                            }
                            break;

                        default: // uninteresting extension
                            skip();
                    }
                    break;

                case 0x3b: // terminator
                    done = true;
                    break;

                case 0x00: // bad byte, but keep going and see what happens
                    break;

                default:
                    status = STATUS_FORMAT_ERROR;
            }
        }
    }

   
    protected void readGraphicControlExt() {
        read(); // block size
        int packed = read(); // packed fields
        dispose = (packed & 0x1c) >> 2; // disposal method
        if (dispose == 0) {
            dispose = 1; // elect to keep old image if discretionary
        }
        transparency = (packed & 1) != 0;
        delay = readShort() * 10; // delay in milliseconds
        transIndex = read(); // transparent color index
        read(); // block terminator
    }

   
    protected void readHeader() {
        String id = "";
        for (int i = 0; i < 6; i++) {
            id += (char) read();
        }
        if (!id.startsWith("GIF")) {
            status = STATUS_FORMAT_ERROR;
            return;
        }

        readLSD();
        if (gctFlag && !err()) {
            gct = readColorTable(gctSize);
            bgColor = gct[bgIndex];
        }
    }

   
    protected void readImage() {
        ix = readShort(); // (sub)image position & size
        iy = readShort();
        iw = readShort();
        ih = readShort();

        int packed = read();
        lctFlag = (packed & 0x80) != 0; // 1 - local color table flag
        interlace = (packed & 0x40) != 0; // 2 - interlace flag
        // 3 - sort flag
        // 4-5 - reserved
        lctSize = 2 << (packed & 7); // 6-8 - local color table size

        if (lctFlag) {
            lct = readColorTable(lctSize); // read table
            act = lct; // make local table active
        } else {
            act = gct; // make global table active
            if (bgIndex == transIndex) {
                bgColor = 0;
            }
        }
        int save = 0;
        if (transparency) {
            save = act[transIndex];
            act[transIndex] = 0; // set transparent color if specified
        }

        if (act == null) {
            status = STATUS_FORMAT_ERROR; // no color table defined
        }

        if (err()) {
            return;
        }

        decodeImageData(); // decode pixel data
        skip();

        if (err()) {
            return;
        }

        frameCount++;

        // create new image to receive frame data
        image = Image.createImage(width, height);

        setPixels(); // transfer pixel data to image

        frames.addElement(new GifFrame(image, delay)); // add image to frame
        // list

        if (transparency) {
            act[transIndex] = save;
        }
        resetFrame();

    }

   
    protected void readLSD() {

        // logical screen size
        width = readShort();
        height = readShort();

        // packed fields
        int packed = read();
        gctFlag = (packed & 0x80) != 0; // 1 : global color table flag
        // 2-4 : color resolution
        // 5 : gct sort flag
        gctSize = 2 << (packed & 7); // 6-8 : gct size

        bgIndex = read(); // background color index
        pixelAspect = read(); // pixel aspect ratio
    }

   
    protected void readNetscapeExt() {
        do {
            readBlock();
            if (block[0] == 1) {
                // loop count sub-block
                int b1 = ((int) block[1]) & 0xff;
                int b2 = ((int) block[2]) & 0xff;
                loopCount = (b2 << 8) | b1;
            }
        } while ((blockSize > 0) && !err());
    }

   
    protected int readShort() {
        // read 16-bit value, LSB first
        return read() | (read() << 8);
    }

   
    protected void resetFrame() {
        lastDispose = dispose;
        lrx = ix;
        lry = iy;
        lrw = iw;
        lrh = ih;
        lastImage = image;
        lastBgColor = bgColor;
        dispose = 0;
        transparency = false;
        delay = 0;
        lct = null;
    }

   
    protected void skip() {
        do {
            readBlock();
        } while ((blockSize > 0) && !err());
    }

}

    protected void decodeImageData() {
        int NullCode = -1;
        int npix = iw * ih;
        int available, clear, code_mask, code_size, end_of_information, in_code, old_code, bits, code, count, i, datum, data_size, first, top, bi, pi;

        if ((pixels == null) || (pixels.length < npix)) {
            pixels = new byte[npix]; // allocate new pixel array
        }
        if (prefix == null) {
            prefix = new short[MaxStackSize];
        }
        if (suffix == null) {
            suffix = new byte[MaxStackSize];
        }
        if (pixelStack == null) {
            pixelStack = new byte[MaxStackSize + 1];
        }

        // Initialize GIF data stream decoder.

        data_size = read();
        clear = 1 << data_size;
        end_of_information = clear + 1;
        available = clear + 2;
        old_code = NullCode;
        code_size = data_size + 1;
        code_mask = (1 << code_size) - 1;
        for (code = 0; code < clear; code++) {
            prefix[code] = 0;
            suffix[code] = (byte) code;
        }

        // Decode GIF pixel stream.

        datum = bits = count = first = top = pi = bi = 0;

        for (i = 0; i < npix; ) {
            if (top == 0) {
                if (bits < code_size) {
                    // Load bytes until there are enough bits for a code.
                    if (count == 0) {
                        // Read a new data block.
                        count = readBlock();
                        if (count <= 0) {
                            break;
                        }
                        bi = 0;
                    }
                    datum += (((int) block[bi]) & 0xff) << bits;
                    bits += 8;
                    bi++;
                    count--;
                    continue;
                }

                // Get the next code.

                code = datum & code_mask;
                datum >>= code_size;
                bits -= code_size;

                // Interpret the code

                if ((code > available) || (code == end_of_information)) {
                    break;
                }
                if (code == clear) {
                    // Reset decoder.
                    code_size = data_size + 1;
                    code_mask = (1 << code_size) - 1;
                    available = clear + 2;
                    old_code = NullCode;
                    continue;
                }
                if (old_code == NullCode) {
                    pixelStack[top++] = suffix[code];
                    old_code = code;
                    first = code;
                    continue;
                }
                in_code = code;
                if (code == available) {
                    pixelStack[top++] = (byte) first;
                    code = old_code;
                } while (code > clear) {
                    pixelStack[top++] = suffix[code];
                    code = prefix[code];
                }
                first = ((int) suffix[code]) & 0xff;

                // Add a new string to the string table,

                if (available >= MaxStackSize) {
                    break;
                }
                pixelStack[top++] = (byte) first;
                prefix[available] = (short) old_code;
                suffix[available] = (byte) first;
                available++;
                if (((available & code_mask) == 0)
                    && (available < MaxStackSize)) {
                    code_size++;
                    code_mask += available;
                }
                old_code = in_code;
            }

            // Pop a pixel off the pixel stack.

            top--;
            pixels[pi++] = pixelStack[top];
            i++;
        }

        for (i = pi; i < npix; i++) {
            pixels[i] = 0; // clear missing pixels
        }

    }

   
    protected boolean err() {
        return status != STATUS_OK;
    }

   
    protected void init() {
        status = STATUS_OK;
        frameCount = 0;
        frames = new Vector();
        gct = null;
        lct = null;
    }

   
    protected int read() {
        int curByte = 0;
        try {
            curByte = in.read();
        } catch (Exception e) {
            status = STATUS_FORMAT_ERROR;
        }
        return curByte;
    }

   
    protected int readBlock() {
        blockSize = read();
        int n = 0;
        if (blockSize > 0) {
            try {
                int count = 0;
                while (n < blockSize) {
                    count = in.read(block, n, blockSize - n);
                    if (count == -1) {
                        break;
                    }
                    n += count;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

            if (n < blockSize) {
                status = STATUS_FORMAT_ERROR;
            }
        }
        return n;
    }

private GIFDecode gifd;
 private int ind;
 private int gifCount;
 private Image frame;

 void initGIF() {
  gifd = new GIFDecode();
  gifd.read(this.getClass().getResourceAsStream("/ar.gif"));//载入gif图片
  ind = 0;
  gifCount = gifd.getFrameCount();//获得帧数
  System.out.println("gifCount="+gifCount);
 }

 void drawProgressBar(Graphics g, int xpos, int ypos, int anchor) {
  frame = gifd.getFrame(ind);
  ind++;
  if (ind >= gifCount) {
   ind = 0;
  }
  g.drawImage(frame, xpos, ypos, anchor);//循环绘图
 }

//////////////////////////////////////////////////////////////////////////////////

import java.util.Vector;
import java.io.InputStream;
import javax.microedition.lcdui.Image;

public class GIFDecode {
   
    public static final int STATUS_OK = 0;

   
    public static final int STATUS_FORMAT_ERROR = 1;

   
    public static final int STATUS_OPEN_ERROR = 2;

    protected InputStream in;
    protected int status;

    protected int width; // full image width
    protected int height; // full image height
    protected boolean gctFlag; // global color table used
    protected int gctSize; // size of global color table
    protected int loopCount = 1; // iterations; 0 = repeat forever

    protected int[] gct; // global color table
    protected int[] lct; // local color table
    protected int[] act; // active color table

    protected int bgIndex; // background color index
    protected int bgColor; // background color
    protected int lastBgColor; // previous bg color
    protected int pixelAspect; // pixel aspect ratio

    protected boolean lctFlag; // local color table flag
    protected boolean interlace; // interlace flag
    protected int lctSize; // local color table size

    protected int ix, iy, iw, ih; // current image rectangle
    protected int lrx, lry, lrw, lrh;
    protected Image image; // current frame
    protected Image lastImage; // previous frame

    protected byte[] block = new byte[256]; // current data block
    protected int blockSize = 0; // block size

    // last graphic control extension info
    protected int dispose = 0;
    // 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev
    protected int lastDispose = 0;
    protected boolean transparency = false; // use transparent color
    protected int delay = 0; // delay in milliseconds
    protected int transIndex; // transparent color index

    protected static final int MaxStackSize = 4096;
    // max decoder pixel stack size

    // LZW decoder working arrays
    protected short[] prefix;
    protected byte[] suffix;
    protected byte[] pixelStack;
    protected byte[] pixels;

    protected Vector frames; // frames read from current file
    protected int frameCount;

    static class GifFrame {
        public GifFrame(Image im, int del) {
            image = im;
            delay = del;
        }

        public Image image;
        public int delay;
    }

   
    public int getDelay(int n) {
        delay = -1;
        if ((n >= 0) && (n < frameCount)) {
            delay = ((GifFrame) frames.elementAt(n)).delay;
        }
        return delay;
    }

   
    public int getFrameCount() {
        return frameCount;
    }

   
    public Image getImage() {
        return getFrame(0);
    }

   
    public int getLoopCount() {
        return loopCount;
    }

   
    protected void setPixels() {
        // expose destination image's pixels as int array
        int[] dest = new int[width * height];

        // fill in starting image contents based on last image's dispose code
        if (lastDispose > 0) {
            if (lastDispose == 3) {
                // use image before last
                int n = frameCount - 2;
                if (n > 0) {
                    lastImage = getFrame(n - 1);
                } else {
                    lastImage = null;
                }
            }

            if (lastImage != null) {
                lastImage.getRGB(dest, 0, width, 0, 0, width, height);
                // copy pixels

                if (lastDispose == 2) {
                    // fill last image rect area with background color
                    int c = 0;
                    if (!transparency) {
                        c = lastBgColor;
                    }
                    for (int i = 0; i < lrh; i++) {
                        int n1 = (lry + i) * width + lrx;
                        int n2 = n1 + lrw;
                        for (int k = n1; k < n2; k++) {
                            dest[k] = c;
                        }
                    }
                }
            }
        }

        // copy each source line to the appropriate place in the destination
        int pass = 1;
        int inc = 8;
        int iline = 0;
        for (int i = 0; i < ih; i++) {
            int line = i;
            if (interlace) {
                if (iline >= ih) {
                    pass++;
                    switch (pass) {
                        case 2:
                            iline = 4;
                            break;
                        case 3:
                            iline = 2;
                            inc = 4;
                            break;
                        case 4:
                            iline = 1;
                            inc = 2;
                    }
                }
                line = iline;
                iline += inc;
            }
            line += iy;
            if (line < height) {
                int k = line * width;
                int dx = k + ix; // start of line in dest
                int dlim = dx + iw; // end of dest line
                if ((k + width) < dlim) {
                    dlim = k + width; // past dest edge
                }
                int sx = i * iw; // start of line in source
                while (dx < dlim) {
                    // map color and insert in destination
                    int index = ((int) pixels[sx++]) & 0xff;
                    int c = act[index];
                    if (c != 0) {
                        dest[dx] = c;
                    }
                    dx++;
                }
            }
        }
        image = Image.createRGBImage(dest, width, height, false);
    }

   
    public Image getFrame(int n) {
        Image im = null;
        if ((n >= 0) && (n < frameCount)) {
            im = ((GifFrame) frames.elementAt(n)).image;
        }
        return im;
    }

   
    public int read(InputStream is) {
        init();
        if (is != null) {
            in = is;
            readHeader();
            if (!err()) {
                readContents();
                if (frameCount < 0) {
                    status = STATUS_FORMAT_ERROR;
                }
            }
        } else {
            status = STATUS_OPEN_ERROR;
        }
        try {
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return status;
    }