Create a small-caps spannable string that will work with any font

GetSmallCapsString.java

/**
 * Produce a formatted SpannableString object from a given String
 * input, with all lowercase characters converted to smallcap
 * characters. Uses only standard A-Z characters, so works with
 * any font.
 * 
 * @param input  The input string, e.g. "Small Caps"
 * @return       A formatted SpannableString, e.g. "Sᴍᴀʟʟ Cᴀᴘs"
 */
 public static SpannableString getSmallCapsString(String input) {
	// values needed to record start/end points of blocks of lowercase letters
	char[] chars = input.toCharArray();
	int currentBlock = 0;
	int[] blockStarts = new int[chars.length];
	int[] blockEnds = new int[chars.length];
	boolean blockOpen = false;

	// record where blocks of lowercase letters start/end
	for (int i = 0; i < chars.length; ++i) {
		char c = chars[i];
		if (c >= 'a' && c <= 'z') {
			if (!blockOpen) {
				blockOpen = true;
				blockStarts[currentBlock] = i;
			}
			// replace with uppercase letters
			chars[i] = (char) (c - 'a' + '\u0041');
		} else {
			if (blockOpen) {
				blockOpen = false;
				blockEnds[currentBlock] = i;
				++currentBlock;
			}
		}
	}

	// add the string end, in case the last character is a lowercase letter
	blockEnds[currentBlock] = chars.length;
	
	// shrink the blocks found above
	SpannableString output = new SpannableString(String.valueOf(chars));
	for (int i = 0; i < Math.min(blockStarts.length, blockEnds.length); ++i) {
		output.setSpan(new RelativeSizeSpan(0.8f), blockStarts[i], blockEnds[i], Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
	}
	
	return output;
}