基于Android开发支持表情的实现详解

private Context mContext = null;
private Pattern mPattern = null;
private HashMap<String, Integer> mSmileyTextToId = null;
private final String[] mSmileyArrays =
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 stub
mContext = 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;
}
}

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: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"

/>