Android实现TextView字符串关键字变色的方法

public static CharSequence setColor(Context context, String text, String text1, String text2) {
 SpannableStringBuilder style = new SpannableStringBuilder(text);
// 关键字“孤舟”变色，0-text1.length()
 style.setSpan(new ForegroundColorSpan(context.getResources().getColor(R.color.colorPrimary)), 0, text1.length(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// 关键字“寒江雪”变色，text1.length() + 6-text1.length() + 6 + text2.length()
 style.setSpan(new ForegroundColorSpan(context.getResources().getColor(R.color.colorAccent)), text1.length() + 6, text1.length() + 6 + text2.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
 return style;
}

public static CharSequence matcherSearchText(int color, String string, String keyWord) {
 SpannableStringBuilder builder = new SpannableStringBuilder(string);
 int indexOf = string.indexOf(keyWord);
 if (indexOf != -1) {
 builder.setSpan(new ForegroundColorSpan(color), indexOf, indexOf + keyWord.length(), SPAN_EXCLUSIVE_EXCLUSIVE);
 }
 return builder;
}

public static SpannableString matcherSearchText(int color, String text, String keyword) {
 SpannableString ss = new SpannableString(text);
​
 Pattern pattern = Pattern.compile(keyword);
 Matcher matcher = pattern.matcher(ss);
​
 while (matcher.find()) {
 int start = matcher.start();
 int end = matcher.end();
 ss.setSpan(new ForegroundColorSpan(color), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
 }
​
 return ss;
}

public static SpannableString matcherSearchTitle(int color, String text, String keyword) {
 String string = text.toLowerCase();
 String key = keyword.toLowerCase();
​
 Pattern pattern = Pattern.compile(key);
 Matcher matcher = pattern.matcher(string);
​
 SpannableString ss = new SpannableString(text);
 while (matcher.find()) {
 int start = matcher.start();
 int end = matcher.end();
 ss.setSpan(new ForegroundColorSpan(color), start, end,
     Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
 }
 return ss;
}