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/**
* 将给定的字符串给定的长度两端对齐
*
* @param str 待对齐字符串
* @param size 汉字个数，eg:size=5，则将str在5个汉字的长度里两端对齐
*  @Return
*/
public static SpannableStringBuilder justifyString(String str, int size) {
SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder();
if (TextUtils.isEmpty(str)) {
return spannableStringBuilder;
}
char[] chars = str.toCharArray();
if (chars.length >= size || chars.length == 1) {
return spannableStringBuilder.append(str);
}
int l = chars.length;
float scale = (float) (size - l) / (l - 1);
for (int i = 0; i < l; i++) {
spannableStringBuilder.append(chars[i]);
if (i != l - 1) {
SpannableString s = new SpannableString("　");//全角空格
s.setSpan(new ScaleXSpan(scale), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableStringBuilder.append(s);
}
}
return spannableStringBuilder;
}