Edittext不接受2个连续的值

editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // 判断是否有两个连续的值
        if (s.length() >= 2 && s.charAt(s.length() - 1) == s.charAt(s.length() - 2)) {
            // 删除第二个值
            editText.setText(s.subSequence(0, s.length() - 1));
            // 将光标移动到末尾
            editText.setSelection(editText.getText().length());
        }
    }

    @Override
    public void afterTextChanged(Editable s) {
    }
});

InputFilter filter = new InputFilter() {
    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        // 判断是否有两个连续的值
        if (dest.length() >= 1 && source.length() >= 1 && dest.charAt(dest.length() - 1) == source.charAt(0)) {
            // 删除第二个值
            return "";
        }
        return null; // 返回null表示不做任何处理
    }
};

editText.setFilters(new InputFilter[]{filter});