public class MaxTextLengthFilter implements InputFilter {
private int mMaxLength;
//构造方法中传入最多能输入的字数
public MaxTextLengthFilter(int max) {
mMaxLength = max;
}
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
int keep = mMaxLength - (dest.length() - (dend - dstart));
if (keep < (end - start)) {
showToast("最多只能输入" + mMaxLength + "个字");
}
if (keep <= 0) {
return "";
} else if (keep >= end - start) {
return null;
} else {
return source.subSequence(start, start + keep);
}
}
}
简单用法:
找到你需要限制字数的EditText,直接设置就行
editText.setFilters(new InputFilter[]{new MaxTextLengthFilter(64)});
