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基于Android開(kāi)發(fā)支持表情的實(shí)現(xiàn)詳解

更新時(shí)間：2013年05月10日 10:48:14 投稿：jingxian

本篇文章是對(duì)在Android開(kāi)發(fā)中支持表情的實(shí)現(xiàn)代碼進(jìn)行了介紹。需要的朋友參考下

最近項(xiàng)目需要支持表情，表情的添加和解析實(shí)現(xiàn)基本上是參照Android自身的SmileyParser，具體就不多講了，直接貼上代碼：

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 =
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的對(duì)應(yīng)關(guān)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;
}

/**
* 建立匹配用的正則表達(dá)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());
}

/**
* 把文字轉(zhuǎn)換為圖片
* @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;
}
}

實(shí)現(xiàn)過(guò)程中遇到個(gè)小問(wèn)題：往TextView中添加表情時(shí)，當(dāng)文本既有表情也有文字時(shí)，顯示是正常的，但是當(dāng)文本中只有表情時(shí)，發(fā)現(xiàn)表情顯示會(huì)偏上，而且上面有一部分被截?cái)唷?br />
TextView布局如下：

復(fù)制代碼代碼如下:

<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"

/>

解決方法：這里的問(wèn)題應(yīng)該是TextView在判斷行距的時(shí)候是根據(jù)字體來(lái)判斷的，但是當(dāng)文本是表情的時(shí)候這個(gè)判斷有些問(wèn)題，導(dǎo)致行距過(guò)小，所以顯示表情的時(shí)候就截?cái)嗔?，解決方法是設(shè)置一下TextView的最小高度，同時(shí)要指定文本向下對(duì)齊。另外在創(chuàng)建ImagePan的時(shí)候如果指定ImageSpan.ALIGN_BOTTOM對(duì)齊方式一般是不會(huì)出現(xiàn)這個(gè)問(wèn)題的，但是這種方式下表情顯示會(huì)偏下。

修改后TextView布局如下：