Android學習筆記：完整執行個體實現QQ表情的發送和接收

 

在自己做一個聊天應用練習的時候，需要用到表情，於是就想著模仿一下QQ表情，圖片資源完全copy的QQ.apk，解壓就可以得到，這裡不細說。

下面將該應用中的表情模組功能抽離出來，以便自己以後複習回顧。。

先看一下：

首先進入介面：（完全仿照QQ）

 

點擊一下上面的表情表徵圖：

選擇一些表情，輸入一些文字混合：

點擊發送：

可以看到文字和表情圖片都一起顯示出來了。

 

下面列出一些關鍵代碼：

表情工具類ExpressionUtil:

public class ExpressionUtil {/** * 對spanableString進行正則判斷，如果符合要求，則以表情圖片代替 * @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());//通過上面匹配得到的字串來產生圖片資源id            if (resId != 0) {                Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resId);                ImageSpan imageSpan = new ImageSpan(bitmap);//通過圖片資源id來得到bitmap，用一個ImageSpan來封裝                int end = matcher.start() + key.length();//計算該圖片名字的長度，也就是要替換的字串的長度                spannableString.setSpan(imageSpan, matcher.start(), end, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);//將該圖片替換字串中規定的位置中                if (end < spannableString.length()) {//如果整個字串還未驗證完，則繼續。。                    dealExpression(context,spannableString,  patten, end);                }                break;            }        }    }        /**     * 得到一個SpanableString對象，通過傳入的字串,並進行正則判斷     * @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);//通過傳入的Regex來產生一個pattern        try {            dealExpression(context,spannableString, sinaPatten, 0);        } catch (Exception e) {            Log.e("dealExpression", e.getMessage());        }        return spannableString;    }}

在顯示聊天頁面的list的適配器中，我們需要做如下的顯示，即調用上面工具類的方法：

SimpleChatAdapter中的內部類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())){//根據本地的mac地址來判斷該條資訊是屬於本人所說還是對方所說//如果是自己說的，則顯示在右邊；如果是對方所說，則顯示在左邊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()));//設定頭像String str = msg.getMsg();//訊息具體內容String zhengze = "f0[0-9]{2}|f10[0-7]";//Regex，用來判斷訊息內是否有表情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();}}}

關於表情彈出框的實現如下：

MainActivity：

/** * 建立一個表情選擇對話方塊 */private void createExpressionDialog() {builder = new Dialog(MainActivity.this);GridView gridView = createGridView();builder.setContentView(gridView);builder.setTitle("預設表情");builder.show();gridView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic 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();}});}/** * 產生一個表情對話方塊中的gridview * @return */private GridView createGridView() {final GridView view = new GridView(this);List<Map<String,Object>> listItems = new ArrayList<Map<String,Object>>();//產生107個表情的id，封裝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;}

Demo下載：http://download.csdn.net/detail/duancanmeng/4382260