如何将白色设置为 TextView 中的任何字母，除了 android 中的数字和逗号？

Question

I want to set white color to any letter in TextView except numbers and commas and Then I want to set the color of other charactors to White. How can I do it?

Example

19,319,931 coins
//19,319,931 should has yellow color.
//coins should has has white color

Answer 1

You can use Spannable TextView

A spannable TextView can be used in Android to highlight a particular portion of text with a different color, style, size, and/or click event in a single TextView widget.

So Try this:

    String coinText = txtDiamonds.getText().toString();
    char currentChar;
    Spannable spannable = new SpannableString(coinText);
    ForegroundColorSpan color;
    for (int i = 0; i < coinText.length(); i++) {
        currentChar = coinText.charAt(i);
        if (Character.isDigit(currentChar) || ((int) currentChar) == ((int) ','))
            color = new ForegroundColorSpan(Color.YELLOW);
        else
            color = new ForegroundColorSpan(Color.WHITE);
        spannable.setSpan(color, i, i + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    }
    txtDiamonds.setText(spannable);

Answer 2

You can also use Regular expressions as follows

Spannable spannable = new SpannableString(myTextView.getText().toString());
// Matching non-digits
Matcher matcher = Pattern.compile("\\D+").matcher(text);
while (matcher.find()) {
    spannable.setSpan(new ForegroundColorSpan(Color.WHITE), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}

// Matching digits followed by "," 0 or 1 time
matcher = Pattern.compile("\\d+,?").matcher(text);
while (matcher.find()) {
    spannable.setSpan(new ForegroundColorSpan(Color.YELLOW), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}

myTextView.setText(spannable);