本文实例讲述了Android编程实现QQ表情的发送和接收。分享给大家供大家参考，具体如下：

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）

点击一下上面的表情图标：

选择一些表情，输入一些文字混合：

点击发送：

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：

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：

/** * 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; } 

完整实例代码代码点击此处本站下载。

希望本文所述对大家Android程序设计有所帮助。