展示效果：
image.png
/**
* 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
* @param isAddColon 是否添加冒号
* @return 调整后的字符串
*/
public static SpannableStringBuilder justifyString(String str, int size, boolean isAddColon) {
SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder();
if (TextUtils.isEmpty(str)) {
return spannableStringBuilder;
}
char[] chars = str.toCharArray();
if (chars.length >= size || chars.length == 1) {
spannableStringBuilder.append(str);
if (isAddColon){
spannableStringBuilder.append("：");
}
return spannableStringBuilder;
}
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) {
// 全角空格;
SpannableString s = new SpannableString(" ");
s.setSpan(new ScaleXSpan(scale), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableStringBuilder.append(s);
}
}
if (isAddColon){
spannableStringBuilder.append("：");
}
return spannableStringBuilder;
}
