好久没有对这一系列进行更新了，不知道各位亲的Android功力有没有更上一层楼？本来并没有打算在这段时间发表新的博客，但是由于这一两天找到了一个能够让Android上显示Gif图片的方法，这样一来，寒假里没有解决的QQ添加动态表情的问题便有了一个初步的解决方法。下面进入正题~ PS：本讲源码地址在文末。
本节的目标是对TextView进行修改，最终实现在TextView插入动态图片的效果。QQ聊天界面的动态表情、大表情、或者一些第三方的动态图就是实现了这个效果。
老规矩首先上一个效果图：
那两只小鸡其实都是动图，只不过这里不好发Gif，你也可以注意到左右两图的小黄鸡是不一样的，说明它在动~
然后讲一下基本原理：
谷歌官方并没有给出Gif的显示控件（虽然我想在高霸上的谷歌眼中这不过是随便敲敲键盘的事儿），网络上给的解决思路，基本上可以分为两个方向：
一、使用Movie类，将Gif当成视频来播放。 经验证之后发现这种方法并不靠谱，播放的Gif不是花屏就是完全黑屏，而且另外一个缺点是可操作性不强，比如就没有办法把它嵌在TextView中。因此，不推荐用此方法，各位所有为此困扰的建议果断抛弃这种思路。
二、将Gif文件 分解成多帧图片，然后由一个线程控制ImageView或者ImageSpan按照一定的时间间隔循环加载这几帧图片。
而对于如何将Gif图片分解成多帧图片又有两种思路：一个是人工采用一个软件将gif图片分解成多个帧，然后把这每一帧都放进资源文件夹中，然后按照上面的方法进行加载，这种方法虽然看起来很笨，但是效果最流畅，我估计较早版本的手机QQ可能这样干过== 另外一种思路就是采用工具类进行即时解码，这种方法看起来比较高端，但对内存资源的消耗比较多，还有一个关键的问题是现在很难找到一个完美的工具类可以对Gif图片有较好的解码，我想腾讯肯定会有，但是不见得会开源..现在上一个gifView.jar的工具包，有兴趣可以去网上搜一下，这个工具包里面对于gif的软解码还是比较全，当然也不完美。
在本项目中采用的也是第二种思路，即采用一个工具类GifOpenHelper.java对gif进行解码，将生成的一组Bitmap对象存储在一个ArrayList<Bitmap>中，然后由线程控制加载。这里首先声明这个工具类不是我原创的，也有一些缺陷，首先给出这个类：
package com.example.textactivity;import java.io.InputStream;import java.util.Vector;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;//Handler for read & extract Bitmap from *.gifpublic class GifOpenHelper {// to store *.gif data, Bitmap & delayclass GifFrame {// to access image & delay w/o interfacepublic Bitmap image;public int delay;public GifFrame(Bitmap im, int del) {image = im;delay = del;}}// to define some error typepublic static final int STATUS_OK = 0;public static final int STATUS_FORMAT_ERROR = 1;public static final int STATUS_OPEN_ERROR = 2;protected int status;protected InputStream in;protected int width; // full image widthprotected int height; // full image heightprotected boolean gctFlag; // global color table usedprotected int gctSize; // size of global color tableprotected int loopCount = 1; // iterations; 0 = repeat foreverprotected int[] gct; // global color tableprotected int[] lct; // local color tableprotected int[] act; // active color tableprotected int bgIndex; // background color indexprotected int bgColor; // background colorprotected int lastBgColor; // previous bg colorprotected int pixelAspect; // pixel aspect ratioprotected boolean lctFlag; // local color table flagprotected boolean interlace; // interlace flagprotected int lctSize; // local color table sizeprotected int ix, iy, iw, ih; // current image rectangleprotected int lrx, lry, lrw, lrh;protected Bitmap image; // current frameprotected Bitmap lastImage; // previous frameprotected int frameindex = 0;public int getFrameindex() {return frameindex;}public void setFrameindex(int frameindex) {this.frameindex = frameindex;if (frameindex > frames.size() - 1) {frameindex = 0;} //设置循环播放 }protected byte[] block = new byte[256]; // current data blockprotected int blockSize = 0; // block size// last graphic control extension infoprotected int dispose = 0;// 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prevprotected int lastDispose = 0;protected boolean transparency = false; // use transparent colorprotected int delay = 0; // delay in millisecondsprotected int transIndex; // transparent color indexprotected static final int MaxStackSize = 4096;// max decoder pixel stack size// LZW decoder working arraysprotected short[] prefix;protected byte[] suffix;protected byte[] pixelStack;protected byte[] pixels;protected Vector<GifFrame> frames; // frames read from current fileprotected int frameCount;// to get its Width / Heightpublic int getWidth() {return width;}public int getHeigh() {return height;}/*** Gets display duration for specified frame.* * @param n* int index of frame* @return delay in milliseconds*/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 Bitmap getImage() {return getFrame(0);}public int getLoopCount() {return loopCount;}protected void setPixels() {int[] dest = new int[width * height];// fill in starting image contents based on last image's dispose codeif (lastDispose > 0) {if (lastDispose == 3) {// use image before lastint n = frameCount - 2;if (n > 0) {lastImage = getFrame(n - 1);} else {lastImage = null;}}if (lastImage != null) {lastImage.getPixels(dest, 0, width, 0, 0, width, height);// copy pixelsif (lastDispose == 2) {// fill last image rect area with background colorint 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 destinationint 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 destint dlim = dx + iw; // end of dest lineif ((k + width) < dlim) {dlim = k + width; // past dest edge}int sx = i * iw; // start of line in sourcewhile (dx < dlim) {// map color and insert in destinationint index = ((int) pixels[sx++]) & 0xff;int c = act[index];if (c != 0) {dest[dx] = c;}dx++;}}}image = Bitmap.createBitmap(dest, width, height, Config.RGB_565);}public Bitmap getFrame(int n) {Bitmap im = null;if ((n >= 0) && (n < frameCount)) {im = ((GifFrame) frames.elementAt(n)).image;}return im;}public Bitmap nextBitmap() {frameindex++;if (frameindex > frames.size() - 1) {frameindex = 0;}return ((GifFrame) frames.elementAt(frameindex)).image;}public int nextDelay() {return ((GifFrame) frames.elementAt(frameindex)).delay;}// to read & parse all *.gif streampublic 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;}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 codeif ((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;}// to initia variablepublic void init() {status = STATUS_OK;frameCount = 0;frames = new Vector<GifFrame>();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;}// Global Color Tableprotected 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 checksint 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;}// Image Descriptorprotected void readContents() {// read GIF file content blocksboolean done = false;while (!(done || err())) {int code = read();switch (code) {case 0x2C: // image separatorreadImage();break;case 0x21: // extensioncode = read();switch (code) {case 0xf9: // graphics control extensionreadGraphicControlExt();break;case 0xff: // application extensionreadBlock();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 extensionskip();}break;case 0x3b: // terminatordone = true;break;case 0x00: // bad byte, but keep going and see what happensbreak;default:status = STATUS_FORMAT_ERROR;}}}protected void readGraphicControlExt() {read(); // block sizeint packed = read(); // packed fieldsdispose = (packed & 0x1c) >> 2; // disposal methodif (dispose == 0) {dispose = 1; // elect to keep old image if discretionary }transparency = (packed & 1) != 0;delay = readShort() * 10; // delay in millisecondstransIndex = read(); // transparent color indexread(); // block terminator }// to get Stream - Headprotected 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() {// offset of Xix = readShort(); // (sub)image position & size// offset of Yiy = readShort();// width of bitmapiw = readShort();// height of bitmapih = readShort();// Local Color Table Flagint packed = read();lctFlag = (packed & 0x80) != 0; // 1 - local color table flag// Interlace Flag, to array with interwoven if ENABLE, with order// otherwiseinterlace = (packed & 0x40) != 0; // 2 - interlace flag// 3 - sort flag// 4-5 - reservedlctSize = 2 << (packed & 7); // 6-8 - local color table sizeif (lctFlag) {lct = readColorTable(lctSize); // read tableact = lct; // make local table active} else {act = gct; // make global table activeif (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 dataimage = Bitmap.createBitmap(width, height, Config.RGB_565);// createImage(width, height);setPixels(); // transfer pixel data to imageframes.addElement(new GifFrame(image, delay)); // add image to frame// listif (transparency) {act[transIndex] = save;}resetFrame();}// Logical Screen Descriptorprotected void readLSD() {// logical screen sizewidth = readShort();height = readShort();// packed fieldsint packed = read();gctFlag = (packed & 0x80) != 0; // 1 : global color table flag// 2-4 : color resolution// 5 : gct sort flaggctSize = 2 << (packed & 7); // 6-8 : gct sizebgIndex = read(); // background color indexpixelAspect = read(); // pixel aspect ratio }protected void readNetscapeExt() {do {readBlock();if (block[0] == 1) {// loop count sub-blockint b1 = ((int) block[1]) & 0xff;int b2 = ((int) block[2]) & 0xff;loopCount = (b2 << 8) | b1;}} while ((blockSize > 0) && !err());}// read 8 bit dataprotected int readShort() {// read 16-bit value, LSB firstreturn 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;}/*** Skips variable length blocks up to and including next zero length block.*/protected void skip() {do {readBlock();} while ((blockSize > 0) && !err());}}
该类中用到的几个基本方法是：
read(InputStream Is) 读取gif图片流，注意只能是Gif! 具体调用方法参考下面的MyTextView.java类
getImage(); 获取第一帧图片；
nextBitmap() 获取下一帧图片；
getFrameCount(); 获取分解后的总帧数；
nextDelay() 获取帧与帧之间的时间间隔，用于在线程中控制播放效果
对于这个类还想说两句的是不建议把它搞得明明白白，我们的目的是利用一些工具做出想要的控件。当然如果你想做一个制作Gif的应用那反而要好好研究一下算法了。
下面给出来利用GifOpenHelper类设计的TextView升级版本，这个TextView在原有功能的基础上还可以实现静态图片显示、动态图片显示，以及动态图片、静态图片和文字混合显示。 这个类是我自己写的，所以注释给的比较全面~
package com.example.android_qqfix;import java.util.ArrayList;import java.util.HashMap;import java.util.regex.Matcher;import java.util.regex.Pattern;import com.example.utils.FaceData;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Handler;import android.text.Spannable;import android.text.SpannableString;import android.text.style.ImageSpan;import android.util.AttributeSet;import android.widget.TextView;public class MyTextView extends TextView{/*** @author Dragon* SpanInfo 类用于存储一个要显示的图片（动态或静态）的信息，包括分解后的每一帧mapList、替代文字的起始位置、终止位置* 、帧的总数、当前需要显示的帧、帧与帧之间的时间间隔 */private class SpanInfo{ArrayList<Bitmap> mapList;int start,end,frameCount,currentFrameIndex,delay;public SpanInfo(){mapList=new ArrayList<Bitmap>();start=end=frameCount=currentFrameIndex=delay=0; }}/*** spanInfoList 是一个SpanInfo的list ,用于处理一个TextView中出现多个要匹配的图片的情况*/private ArrayList<SpanInfo> spanInfoList=null;private Handler handler; //用于处理从子线程TextView传来的消息private String myText; //存储textView应该显示的文本/*** 这三个构造方法一个也不要少，否则会产生CastException，注意在这三个构造函数中都为spanInfoList实例化，可能有些浪费* ，但保证不会有空指针异常* @param context* @param attrs* @param defStyle*/public MyTextView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stubspanInfoList=new ArrayList<SpanInfo>();}public MyTextView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubspanInfoList=new ArrayList<SpanInfo>();}public MyTextView(Context context) {super(context);// TODO Auto-generated constructor stubspanInfoList=new ArrayList<SpanInfo>();}/*** 对要显示在textView上的文本进行解析，看看是否文本中有需要与Gif或者静态图片匹配的文本* 若有，那么调用parseGif 对该文本对应的Gif图片进行解析 或者嗲用parseBmp解析静态图片* @param inputStr*/private void parseText(String inputStr){myText=inputStr;Pattern mPattern=pile("\\\\..");Matcher mMatcher=mPattern.matcher(inputStr);while(mMatcher.find()){String faceName=mMatcher.group();Integer faceId=null;/*** 这里匹配时用到了图片库，即一个专门存放图片id和其匹配的名称的静态对象，这两个静态对象放在了FaceData.java* 中，并采用了静态块的方法进行了初始化，不会有空指针异常*/if((faceId=FaceData.gifFaceInfo.get(faceName))!=null){parseGif(faceId, mMatcher.start(), mMatcher.end());}else if((faceId=FaceData.staticFaceInfo.get(faceName))!=null){parseBmp(faceId, mMatcher.start(), mMatcher.end());}}}/*** 对静态图片进行解析：* 创建一个SpanInfo对象，帧数设为1，按照下面的参数设置，最后不要忘记将SpanInfo对象添加进spanInfoList中，* 否则不会显示* @param resourceId* @param start* @param end*/private void parseBmp(int resourceId,int start, int end){Bitmap bitmap=BitmapFactory.decodeResource(getContext().getResources(), resourceId);ImageSpan imageSpan=new ImageSpan(getContext(),bitmap);SpanInfo spanInfo=new SpanInfo();spanInfo.currentFrameIndex=0;spanInfo.frameCount=1;spanInfo.start=start;spanInfo.end=end;spanInfo.delay=100;spanInfo.mapList.add(bitmap);spanInfoList.add(spanInfo);}/*** 解析Gif图片，与静态图片唯一的不同是这里需要调用GifOpenHelper类读取Gif返回一系一组bitmap（用for 循环把这一* 组的bitmap存储在SpanInfo.mapList中，此时的frameCount参数也大于1了）* @param resourceId* @param start* @param end*/private void parseGif(int resourceId ,int start, int end){ GifOpenHelper helper=new GifOpenHelper();helper.read(getContext().getResources().openRawResource(resourceId));SpanInfo spanInfo=new SpanInfo();spanInfo.currentFrameIndex=0;spanInfo.frameCount=helper.getFrameCount();spanInfo.start=start;spanInfo.end=end;spanInfo.mapList.add(helper.getImage());for(int i=1; i<helper.getFrameCount(); i++){spanInfo.mapList.add(helper.nextBitmap());}spanInfo.delay=helper.nextDelay(); //获得每一帧之间的延迟 spanInfoList.add(spanInfo);}/*** MyTextView 与外部对象的接口，以后设置文本内容时使用setSpanText() 而不再是setText();* @param handler* @param text*/public void setSpanText(Handler handler, String text){this.handler=handler;//获得UI的HandlerparseText(text); //对String对象进行解析TextRunnable r=new TextRunnable(); //生成Runnable对象handler.post(r); //利用UI线程的Handler 将r添加进消息队列中。 }public class TextRunnable implements Runnable{@Overridepublic void run() {// TODO Auto-generated method stubSpannableString sb=new SpannableString(""+myText); //获得要显示的文本int gifCount=0;SpanInfo info=null;for(int i=0; i<spanInfoList.size(); i++){ //for循环，处理显示多个图片的问题info=spanInfoList.get(i);if(info.mapList.size()>1){ /** gifCount用来区分是Gif还是BMP，若是gif gifCount>0 ,否则gifCount=0*/gifCount++;}Bitmap bitmap=info.mapList.get(info.currentFrameIndex);info.currentFrameIndex=(info.currentFrameIndex+1)%(info.frameCount);/*** currentFrameIndex 用于控制当前应该显示的帧的序号，每次显示之后currentFrameIndex* 应该加1 ，加到frameCount后再变成0循环显示*/if(gifCount!=0){bitmap=Bitmap.createScaledBitmap(bitmap, 60, 60, true);}else{bitmap=Bitmap.createScaledBitmap(bitmap, 30, 30, true);}ImageSpan imageSpan=new ImageSpan(getContext(),bitmap); sb.setSpan(imageSpan, info.start, info.end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);}//对所有的图片对应的ImageSpan完成设置后，调用TextView的setText方法设置文本MyTextView.this.setText(sb); /*** 这一步是为了节省内存而是用，即如果文本中只有静态图片没有动态图片，那么该线程就此终止，不会重复执行* 。而如果有动图，那么会一直执行*/if(gifCount!=0){handler.postDelayed(this,info.delay );}}}}
这里有几点要特别说明：
1、不能在MyTextView中开辟子线程，然后利用sleep方法每隔一段时间像ChatActivity的Handler发送一个Message， 这样的话系统也认为是线程不安全的，会报错。经过我尝试，目前可行的办法，就是在MyTextView中创建一个Runnable对象，然后用UI的Handler的post() 和postDelay() 方法按照一定的时间间隔调用。至于其原因我也不太明白，但这说明采用Runnable对象比采用Message对象的线程安全性更高一些。
2、还有一点是为什么创建这个类？因为在QQ聊天ListView中有多个TextView，几乎不可能在UI线程中获得每一个TextView的引用然后同步控制它们所显示的图片，因此只能把这个操作放给每一个TextView自己去执行相关的操作，这样的代码写出来比较简洁，最大的一个好处就是可复用性好，并且接口调用十分简单：只需要setSpanText(Handler handler, String text);即可，后面会有说明。
此外上面已经提到，这里对表情数据的组织方式进行了优化，新建了一个类用于存储静态对象，并且采用了静态块完成初始化：
package com.example.utils;import java.util.HashMap;import com.example.android_qqfix.R;public class FaceData {public static HashMap<String, Integer> gifFaceInfo;public static HashMap<String,Integer> staticFaceInfo;public static String[] gifFaceName={"\\ji","\\gl"};public static Integer[] gifFaceId={R.raw.ji,R.raw.gl};public static int[] faceId={R.drawable.f_static_000,R.drawable.f_static_001,R.drawable.f_static_002,R.drawable.f_static_003,R.drawable.f_static_004,R.drawable.f_static_005,R.drawable.f_static_006,R.drawable.f_static_009,R.drawable.f_static_010,R.drawable.f_static_011,R.drawable.f_static_012,R.drawable.f_static_013,R.drawable.f_static_014,R.drawable.f_static_015,R.drawable.f_static_017,R.drawable.f_static_018};public static String[] faceName={"\\呲牙","\\淘气","\\流汗","\\偷笑","\\再见","\\敲打","\\擦汗","\\流泪","\\掉泪","\\小声","\\炫酷","\\发狂","\\委屈","\\便便","\\菜刀","\\微笑","\\色色","\\害羞"};//静态块的使用static {gifFaceInfo=new HashMap<String,Integer>();staticFaceInfo=new HashMap<String,Integer>();for(int i=0;i<gifFaceName.length;i++){gifFaceInfo.put(gifFaceName[i], gifFaceId[i]);}for(int i=0;i<faceId.length;i++){staticFaceInfo.put(faceName[i], faceId[i]);}}}
如果有需要的话，可以再添加几个静态方法用于对表情数据进行修改，这里不再赘述。
以上三个类（MyTextView，GifOpenHelper, FaceData）配合起来使用，就可以构成一个比较独立的自定义TextView, 具有显示图片的功能，并且不需要在外部使用SpannableString 的方法设置，因为MyTextView内部已经封装好了，下面那QQ ChatActivity的代码做一个对比：
这是不使用自定义MyTextView之前需要显示图片进行的操作：
private void setFaceText(TextView textView,String text){SpannableString spanStr=parseString(text);textView.setText(spanStr);}private void setFace(SpannableStringBuilder spb, String faceName){Integer faceId=faceMap.get(faceName);if(faceId!=null){Bitmap bitmap=BitmapFactory.decodeResource(getResources(), faceId);bitmap=Bitmap.createScaledBitmap(bitmap, 30, 30, true);ImageSpan imageSpan=new ImageSpan(this,bitmap);SpannableString spanStr=new SpannableString(faceName);spanStr.setSpan(imageSpan, 0, faceName.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);spb.append(spanStr); }else{spb.append(faceName);}}private SpannableString parseString(String inputStr){SpannableStringBuilder spb=new SpannableStringBuilder();Pattern mPattern= pile("\\\\..");Matcher mMatcher=mPattern.matcher(inputStr);String tempStr=inputStr;while(mMatcher.find()){int start=mMatcher.start();int end=mMatcher.end();spb.append(tempStr.substring(0,start));String faceName=mMatcher.group();setFace(spb, faceName);tempStr=tempStr.substring(end, tempStr.length());mMatcher.reset(tempStr);}spb.append(tempStr);return new SpannableString(spb);}//然后调用时setFaceText(holder.textView, chatList.get(position).get(from[1]).toString());
而这是采用MyTextView封装之后的调用方法：
holder.textView.setSpanText(handler,chatList.get(position).get(from[1]).toString());
可见虽然设计MyTextView需要花点功夫，但是调用时换来极大的方便！ 而且可以支持动态表情。
另外注意一点如使用MyTextView 那么xml布局文件中需要做一些修改，就是把TextView 改成自己定义的TextView子类
<com.example.android_qqfix.MyTextView android:id="@+id/chatlist_text_me"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_toLeftOf="@id/chatlist_image_me"android:layout_alignTop="@id/chatlist_image_me"android:textSize="8pt"android:background="@drawable/balloon_back_right"android:paddingTop="13dip"android:paddingBottom="18dip"/>
以上就是本节的主要内容，痛痛快快的写一下博客心情很好~ 不过我想下次见面应该是暑假了，到时我可能会做一个类似FlappyBird之类的小游戏与大家共享，安卓有你更精彩！
最后给自己的寄语：静心学习，努力奋斗，明天更灿烂！
本讲源码地址，欢迎下载：/s/uu2pYkVAfiGo-
