在textview中格式化文本

Question

我一直在使用此处显示的代码：http://www.androidengineer.com/2010/08/easy-method-for-formatting-android.html

我想以几种不同的方式格式化几个不同的单词。例如：段落中的5个单词为红色，6个不同的单词为蓝色等。

我已经能够在for循环中使用代码，但我无法弄清楚如何使用while而不是for。我怀疑它与以某种方式重置开始和结束实例变量有关，但同样没有成功。

这是代码，感谢您的帮助。

public class TextFormatter extends Activity {

private int mFormatCounter;

public void formatText(TextView tV) {

    CharSequence text = tV.getText();
    for (int i = 0; i < 10; i++) {
        switch (mFormatCounter++) {

        case 0:
            text = setSpanBetweenTokens(text, "$$", new StyleSpan(
                    Typeface.BOLD_ITALIC));
            break;

        case 1:
            text = setSpanBetweenTokens(text, "##",
                    new ForegroundColorSpan(Color.RED));
            break;
        case 2:
            text = setSpanBetweenTokens(text, "##",
                    new ForegroundColorSpan(Color.RED));
            break;
        case 3:
            text = setSpanBetweenTokens(text, "##",
                    new ForegroundColorSpan(Color.RED));
            break;

        case 4:
            break;

        case 5:
            text = setSpanBetweenTokens(text, "@@",
                    new ForegroundColorSpan(Color.BLUE));
            break;
        }
        tV.setText(text);
    }
}

/**
 * Given either a Spannable String or a regular String and a token, apply
 * the given CharacterStyle to the span between the tokens, and also remove
 * tokens.
 * <p>
 * For example, {@code setSpanBetweenTokens("Hello ##world##!", "##",
 * new ForegroundColorSpan(0xFFFF0000));} will return a CharSequence
 * {@code "Hello world!"} with {@code world} in red.
 * 
 * @param text
 *            The text, with the tokens, to adjust.
 * @param token
 *            The token string; there should be at least two instances of
 *            token in text.
 * @param cs
 *            The style to apply to the CharSequence. WARNING: You cannot
 *            send the same two instances of this parameter, otherwise the
 *            second call will remove the original span.
 * @return A Spannable CharSequence with the new style applied.
 * 
 * @see http 
 *      ://developer.android.com/reference/android/text/style/CharacterStyle
 *      .html
 */

public static CharSequence setSpanBetweenTokens(CharSequence text,
        String token, CharacterStyle... cs) {
    // Start and end refer to the points where the span will apply
    int tokenLen = token.length();
    int start = text.toString().indexOf(token) + tokenLen;
    int end = text.toString().indexOf(token, start);

    if (start > -1 && end > -1) {
        // Copy the spannable string to a mutable spannable string
        SpannableStringBuilder ssb = new SpannableStringBuilder(text);
        for (CharacterStyle c : cs)
            ssb.setSpan(c, start, end, 0);

        // Delete the tokens before and after the span
        ssb.delete(end, end + tokenLen);
        ssb.delete(start - tokenLen, start);

        text = ssb;
    }

    return text;
}

}