完整实例实现QQ表情的发送和接收

在自己做一个聊天应用练习的时候，需要用到表情，于是就想着模仿一下QQ表情，图片资源完全copy的QQ.apk，解压就可以得到，这里不细说。
下面将该应用中的表情模块功能抽离出来，以便自己以后复习回顾。。
先看一下效果图：

首先进入界面：（完全仿照QQ）

可以看到文字和表情图片都一起显示出来了。
 
下面列出一些关键代码：
表情工具类ExpressionUtil:

public class ExpressionUtil {     /**     * 对spanableString进行正则判断，如果符合要求，则以表情图片代替     * @param context     * @param spannableString     * @param patten     * @param start     * @throws SecurityException     * @throws NoSuchFieldException     * @throws NumberFormatException     * @throws IllegalArgumentException     * @throws IllegalAccessException     */     public static void dealExpression(Context context,SpannableString spannableString, Pattern patten, int start) throws SecurityException, NoSuchFieldException, NumberFormatException, IllegalArgumentException, IllegalAccessException {         Matcher matcher = patten.matcher(spannableString);         while (matcher.find()) {             String key = matcher.group();             if (matcher.start() < start) {                 continue;             }             Field field = R.drawable.class.getDeclaredField(key);             int resId = Integer.parseInt(field.get(null).toString());       //通过上面匹配得到的字符串来生成图片资源id             if (resId != 0) {                 Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resId);                     ImageSpan imageSpan = new ImageSpan(bitmap);                //通过图片资源id来得到bitmap，用一个ImageSpan来包装                 int end = matcher.start() + key.length();                   //计算该图片名字的长度，也就是要替换的字符串的长度                 spannableString.setSpan(imageSpan, matcher.start(), end, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);   //将该图片替换字符串中规定的位置中                 if (end < spannableString.length()) {                        //如果整个字符串还未验证完，则继续。。                     dealExpression(context,spannableString,  patten, end);                 }                 break;             }         }     }          /**     * 得到一个SpanableString对象，通过传入的字符串,并进行正则判断     * @param context     * @param str     * @return     */     public static SpannableString getExpressionString(Context context,String str,String zhengze){         SpannableString spannableString = new SpannableString(str);         Pattern sinaPatten = Pattern.compile(zhengze, Pattern.CASE_INSENSITIVE);        //通过传入的正则表达式来生成一个pattern         try {             dealExpression(context,spannableString, sinaPatten, 0);         } catch (Exception e) {             Log.e("dealExpression", e.getMessage());         }         return spannableString;     }       }  在显示聊天页面的list的适配器中，我们需要做如下的显示，即调用上面工具类的方法：SimpleChatAdapter中的内部类ViewHolder：[java]private class ViewHolder{         RelativeLayout chat_layout;         ImageView image;         TextView text;         public ViewHolder(View convertView){             chat_layout=(RelativeLayout) convertView.findViewById(R.id.team_singlechat_id_listiteam);             image=(ImageView) convertView.findViewById(R.id.team_singlechat_id_listiteam_headicon);             text=(TextView) convertView.findViewById(R.id.team_singlechat_id_listiteam_message);         }         public void setData(MessageInfo msg){             RelativeLayout.LayoutParams rl_chat_left=((RelativeLayout.LayoutParams)chat_layout.getLayoutParams());             RelativeLayout.LayoutParams rl_tv_msg_left=((RelativeLayout.LayoutParams)text.getLayoutParams());             RelativeLayout.LayoutParams rl_iv_headicon_left=((RelativeLayout.LayoutParams)image.getLayoutParams());             if(!DicqConstant.DEFAULTMAC.equalsIgnoreCase(msg.getUsermac())){    //根据本地的mac地址来判断该条信息是属于本人所说还是对方所说                                                                                 //如果是自己说的，则显示在右边；如果是对方所说，则显示在左边                 rl_chat_left.addRule(RelativeLayout.ALIGN_PARENT_LEFT,-1);                 rl_chat_left.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,0);                 rl_iv_headicon_left.addRule(RelativeLayout.ALIGN_PARENT_LEFT,-1);                 rl_iv_headicon_left.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,0);                 rl_tv_msg_left.addRule(RelativeLayout.RIGHT_OF,R.id.team_singlechat_id_listiteam_headicon);                 rl_tv_msg_left.addRule(RelativeLayout.LEFT_OF,0);                 text.setBackgroundResource(R.drawable.balloon_l_selector);             }else{                 rl_chat_left.addRule(RelativeLayout.ALIGN_PARENT_LEFT,0);                 rl_chat_left.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,-1);                 rl_iv_headicon_left.addRule(RelativeLayout.ALIGN_PARENT_LEFT,0);                 rl_iv_headicon_left.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,-1);                 rl_tv_msg_left.addRule(RelativeLayout.RIGHT_OF,0);                 rl_tv_msg_left.addRule(RelativeLayout.LEFT_OF,R.id.team_singlechat_id_listiteam_headicon);                 text.setBackgroundResource(R.drawable.balloon_r_selector);             }             image.setImageResource(PrortaitUtils.conversionIdToRes(msg.getProtrait()));     //设置头像             String str = msg.getMsg();                                                      //消息具体内容             String zhengze = "f0[0-9]{2}|f10[0-7]";                                         //正则表达式，用来判断消息内是否有表情             try {                 SpannableString spannableString = ExpressionUtil.getExpressionString(context, str, zhengze);                 text.setText(spannableString);             } catch (NumberFormatException e) {                 e.printStackTrace();             } catch (SecurityException e) {                 e.printStackTrace();             } catch (IllegalArgumentException e) {                 e.printStackTrace();             }         }     }  关于表情弹出框的实现如下：MainActivity：[java]/**     * 创建一个表情选择对话框     */     private void createExpressionDialog() {         builder = new Dialog(MainActivity.this);          GridView gridView = createGridView();         builder.setContentView(gridView);         builder.setTitle("默认表情");         builder.show();         gridView.setOnItemClickListener(new OnItemClickListener() {                          @Override             public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                     long arg3) {                 Bitmap bitmap = null;                 bitmap = BitmapFactory.decodeResource(getResources(), imageIds[arg2 % imageIds.length]);                 ImageSpan imageSpan = new ImageSpan(MainActivity.this, bitmap);                 String str = null;                 if(arg2<10){                     str = "f00"+arg2;                 }else if(arg2<100){                     str = "f0"+arg2;                 }else{                     str = "f"+arg2;                 }                 SpannableString spannableString = new SpannableString(str);                 spannableString.setSpan(imageSpan, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);                 edit.append(spannableString);                 builder.dismiss();             }         });     }          /**     * 生成一个表情对话框中的gridview     * @return     */     private GridView createGridView() {         final GridView view = new GridView(this);         List<Map<String,Object>> listItems = new ArrayList<Map<String,Object>>();         //生成107个表情的id，封装         for(int i = 0; i < 107; i++){             try {                 if(i<10){                     Field field = R.drawable.class.getDeclaredField("f00" + i);                     int resourceId = Integer.parseInt(field.get(null).toString());                     imageIds[i] = resourceId;                 }else if(i<100){                     Field field = R.drawable.class.getDeclaredField("f0" + i);                     int resourceId = Integer.parseInt(field.get(null).toString());                     imageIds[i] = resourceId;                 }else{                     Field field = R.drawable.class.getDeclaredField("f" + i);                     int resourceId = Integer.parseInt(field.get(null).toString());                     imageIds[i] = resourceId;                 }             } catch (NumberFormatException e) {                 e.printStackTrace();             } catch (SecurityException e) {                 e.printStackTrace();             } catch (IllegalArgumentException e) {                 e.printStackTrace();             } catch (NoSuchFieldException e) {                 e.printStackTrace();             } catch (IllegalAccessException e) {                 e.printStackTrace();             }             Map<String,Object> listItem = new HashMap<String,Object>();             listItem.put("image", imageIds[i]);             listItems.add(listItem);         }                  SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems, R.layout.team_layout_single_expression_cell, new String[]{"image"}, new int[]{R.id.image});         view.setAdapter(simpleAdapter);         view.setNumColumns(6);         view.setBackgroundColor(Color.rgb(214, 211, 214));         view.setHorizontalSpacing(1);         view.setVerticalSpacing(1);         view.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));         view.setGravity(Gravity.CENTER);         return view;     } 作者：duancanmeng