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。