直接抄就行
edittext.setFilters(new InputFilter[]{new LengthFilterUtil(18)});
public class LengthFilterUtil implements InputFilter {
private final int maxLength;
public LengthFilterUtil(int max) {
maxLength = max;
}
public CharSequence filter(CharSequence source, int start, int end, Spanned dest,
int dstart, int dend) {
//限定字符數(shù)量
int dindex = 0;
int count = 0;
//計(jì)算文本框中已經(jīng)存在的字符長(zhǎng)度
while (count <= maxLength && dindex < dest.length()) {
char c = dest.charAt(dindex++);
//這里是根據(jù)ACSII值進(jìn)行判定的中英文赘被，其中中文及中文符號(hào)的ACSII值都是大于128的
if ((int) c <= 128) {
count += 1;
} else {
count += 2;
}
}
if (count > maxLength) {
return dest.subSequence(0, dindex - 1);
}
//計(jì)算輸入的字符長(zhǎng)度
int sindex = 0;
while (count <= maxLength && sindex < source.length()) {
char c = source.charAt(sindex++);
if ((int) c <= 128) {
count += 1;
} else {
count += 2;
}
}
if (count > maxLength) {
sindex--;
}
return source.subSequence(0, sindex);
}
}
