Android EditText最大字数限制并提示

     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)});