android字符串处理(Mms模块短信内容解析)

/***
*
* 此方法描述的是：开始转换了哦
* @author:wujun@cqghong.com,ppwuyi@sohu.com
* @version: 2010-5-13 下午03:32:52
*/
private CharSequence formatMessage(String contact, String body, String subject,
String timestamp, String highlight) {
CharSequence template = mContext.getResources().getText(R.string.name_colon); //遇到鬼了 <主题：<xliff:g id="SUBJECT">%s</xliff:g>>"
SpannableStringBuilder buf = //把他当作StringBuffer只是它可以放的不是 String 而已他能放跟多类型的东西
new SpannableStringBuilder(TextUtils.replace(template,
new String[] { "%s" },
new CharSequence[] { contact })); //替换成联系人
boolean hasSubject = !TextUtils.isEmpty(subject); //主题
if (hasSubject) {
buf.append(mContext.getResources().getString(R.string.inline_subject, subject)); //buff先在是联系人主题 XXXX eg wuyi <主题:dsadasdsa> 我爱我家
}
if (!TextUtils.isEmpty(body)) {
if (hasSubject) {
buf.append(" - "); //如果内容有主题有就+ " - " eg wuyi <主题:sdsadsadsa> -
}
SmileyParser parser = SmileyParser.getInstance(); //获得表情类了哦
buf.append(parser.addSmileySpans(body)); //追查急切关注中
}
if (!TextUtils.isEmpty(timestamp)) {
buf.append("\n");
int startOffset = buf.length();
// put a one pixel high spacer line between the message and the time stamp as requested
// by the spec.
//把之间的信息和时间戳的要求间隔一个像素的高线
//由规范
buf.append("\n");
buf.setSpan(new AbsoluteSizeSpan(3), startOffset, buf.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
startOffset = buf.length();
buf.append(timestamp);
buf.setSpan(new AbsoluteSizeSpan(12), startOffset, buf.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Make the timestamp text not as dark 改变某区域颜色时间的地方为特殊颜色
int color = mContext.getResources().getColor(R.color.timestamp_color);
buf.setSpan(new ForegroundColorSpan(color), startOffset, buf.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
if (highlight != null) {
int highlightLen = highlight.length();
String s = buf.toString().toLowerCase();
int prev = 0;
while (true) {
int index = s.indexOf(highlight, prev);
if (index == -1) {
break;
}
buf.setSpan(new StyleSpan(Typeface.BOLD), index, index + highlightLen, 0);
prev = index + highlightLen;
}
}
return buf;
}

**
* Adds ImageSpans to a CharSequence that replace textual emoticons such
* as :-) with a graphical version.
*
* @param text A CharSequence possibly containing emoticons
* @return A CharSequence annotated with ImageSpans covering any
* recognized emoticons.
* 添加ImageSpans一个CharSequence的表情符号代替文字等 *如用图形版本:-)。
* 核心是把表情字符替换成ImageSpans的对象
*/
public CharSequence addSmileySpans(CharSequence text) {
SpannableStringBuilder builder = new SpannableStringBuilder(text);
Matcher matcher = mPattern.matcher(text);
while (matcher.find()) {
int resId = mSmileyToRes.get(matcher.group());
//注意下面的一块有点不好理解哦但是是核心
builder.setSpan(new ImageSpan(mContext, resId), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
return builder;
}
总结：
android 在将字符转化为表情图像其核心代码为
builder.setSpan(new ImageSpan(mContext, resId), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
原理过程是先匹配到表情字符然后通过new ImageSpan(上下文,表情地址)绘制出一个ImageView然后替换掉表情字符。
五、 Android TextView 支持的HTML标签
<a href="...">
<b>
<big>
<blockquote>
<br>
<cite>
<dfn>
<div align="...">
<em>
<font size="..." color="..." face="...">
<h1>
<h2>
<h3>
<h4>
<h5>
<h6>
<i>
<img src="...">
<p>
<small>
<strike>
<strong>
<sub>
<sup>
<tt>

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