最近项目需要支持表情，表情的添加和解析实现基本上是参照Android自身的SmileyParser，具体就不多讲了，直接贴上代码：
public class SmileyParser { private static SmileyParser sInstance = null;private Context mContext = null;private Pattern mPattern = null;private HashMap<String, Integer> mSmileyTextToId = null;private final String[] mSmileyArrays = {"/西瓜","89","/便便","59","/太陽","74","/偷笑","20","/傲慢","23","/再見","39","/凋謝","64","/發呆","3","/發怒","11","/閃電","54","/可愛","21","/豬頭","46","/咖啡","60","/哈欠","104","/鄙視","105","/委屈","106","/快哭了","107","/陰險","108","/親親","109","/嚇","110","/可憐","111","/菜刀","112","/啤酒","113","/籃球","114","/乒乓","115","/示愛","116","/瓢蟲","117","/抱拳","118","/勾引","119","/拳頭","120","/差勁","121","/愛你","122","/NO","123","/OK","124","/轉圈","125","/磕頭","126","/回頭","127","/跳繩","128","/揮手","129","/激動","130","/街舞","131","/獻吻","132","/左太極","133","/右太極","134","/吐","19","/蛋糕","53","/呲牙","13","/咒罵","31","/足球","57","/嘘","33","/困","25","/大兵","29","/大哭","9","/强","76","/奮鬥","30","/擁抱","49","/害羞","6","/尷尬","10","/右哼哼","103","/慪火","86","/勝利","79","/得意","4","/驚訝","14","/心碎","67","/驚恐","26","/微笑","0","/憨笑","28","/抓狂","18","/折磨","35","/發抖","41","/握手","78","/飛吻","85","/鼓掌","99","/撇嘴","1","/敲打","38","/暈","34","/月亮","75","/流汗","27","/流淚","5","/糗大了","100","/愛心","66","/左哼哼","102","/玫瑰","63","/疑問","32","/白眼","22","/睡","8","/冷汗","96","/示愛","65","/弱","77","/跳跳","43","/色","2","/炸彈","55","/壞笑","101","/衰","36","/刀","56","/調皮","12","/摳鼻","98","/酷","16","/禮物","69","/閉嘴","7","/難過","15","/饑餓","24","/飯","61","/骷髏","37","/愛情","42"};private int[] mSmileyIds = null;private String[] mSmileyTexts = null;public static SmileyParser getInstance() { if (sInstance == null) { sInstance = new SmileyParser(GameDataMgr.getInstance().getActivity());}return sInstance;}private SmileyParser(Context context) { // TODO Auto-generated constructor stubmContext = context;initSmileyIds();mPattern = buildPattern();mSmileyTextToId = buildSmileyRes();} private void initSmileyIds(){ mSmileyIds = new int[mSmileyArrays.length / 2];mSmileyTexts = new String[mSmileyArrays.length /2];for (int i = 0; i < mSmileyArrays.length / 2; i++) { mSmileyTexts[i] = mSmileyArrays[i*2];mSmileyIds[i] = Integer.parseInt(mSmileyArrays[i*2 + 1]);}}public int[] getSmileyIDs(){ return mSmileyIds;}public int getSmileyResourceId(int smileyId){ String idString = "face_" + Integer.toString(smileyId);int id = getResId(idString, mContext, R.drawable.class);return id;}public static int getResId(String variableName, Context context, Class<?> c) { try { Field idField = c.getDeclaredField(variableName); return idField.getInt(idField); } catch (Exception e) { e.printStackTrace(); return -1; } }public String[] getSmileyTexts(){ return mSmileyTexts;}Drawable getSmileyDrawable(int id){ Drawable drawable = null;drawable = mContext.getResources().getDrawable(getSmileyResourceId(id));return drawable;}/*** 建立String - Id的对应关系*/private HashMap<String, Integer> buildSmileyRes(){ HashMap<String, Integer> smileyTextToId = new HashMap<String, Integer>(mSmileyIds.length);for(int i = 0;i < mSmileyIds.length;++i){ smileyTextToId.put(mSmileyTexts[i], mSmileyIds[i]);}return smileyTextToId;}/*** 建立匹配用的正则表达式* @return*/private Pattern buildPattern(){ StringBuilder builder = new StringBuilder(mSmileyTexts.length * 3);builder.append('(');for (String s: mSmileyTexts) { builder.append(Pattern.quote(s));builder.append('|');}builder.replace(builder.length() - 1, builder.length(), ")");return Pattern.compile(builder.toString());}/*** 把文字转换为图片* @param text* @return*/public Spannable addSmileySpans(CharSequence text){ SpannableStringBuilder spBuilder = new SpannableStringBuilder(text);Matcher matcher = mPattern.matcher(text);while (matcher.find()) { int id = mSmileyTextToId.get(matcher.group());matcher.start(),matcher.end(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);spBuilder.setSpan(new ImageSpan(mContext,getSmileyResourceId(id),ImageSpan.ALIGN_BASELINE), matcher.start(),matcher.end(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);}return spBuilder;}}
实现过程中遇到个小问题：往TextView中添加表情时，当文本既有表情也有文字时，显示是正常的，但是当文本中只有表情时，发现表情显示会偏上，而且上面有一部分被截断。TextView布局如下：
<TextView
android:id="@+id/comment_item_content"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:textSize="16sp"
android:textColor="#333333"
/>
解决方法：这里的问题应该是TextView在判断行距的时候是根据字体来判断的，但是当文本是表情的时候这个判断有些问题，导致行距过小，所以显示表情的时候就截断了，解决方法是设置一下TextView的最小高度，同时要指定文本向下对齐。另外在创建ImagePan的时候如果指定ImageSpan.ALIGN_BOTTOM对齐方式一般是不会出现这个问题的，但是这种方式下表情显示会偏下。修改后TextView布局如下：
<TextView
android:id="@+id/comment_item_content"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:textSize="16sp"
android:textColor="#333333"
android:minHeight="25dp"
android:gravity="bottom"
/>