MyEditText.setFilters(new InputFilter[]{filter, new InputFilter.LengthFilter(18)});

/**
     * EditText只能輸入中文
     */
    InputFilter filter = new InputFilter() {
        @Override
        public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
            for (int i = start; i < end; i++) {
                if (!isChinese(source.charAt(i))) {
                    return "";
                }
            }
            return null;
        }
    };

    /**
     * 只能輸入中文的判斷
     *
     * @param c
     * @return
     */
    private boolean isChinese(char c) {
        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
            return true;
        }
        return false;
    }
 

注：輸入非中文，沒有資料（什麼反應都沒有有，只有輸入中文才會顯示出來）。

游標一直在末尾

roomName.setSelection(roomName.getText().length());