在EditText中禁用@ char

InputFilter filter = new InputFilter() {
    public CharSequence filter(CharSequence source, int start, int end,
            Spanned dest, int dstart, int dend) {
        if (source != null && source.toString().contains("@")) {
            return "";
        }
        return null;
    }
};

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

TextWatcher watcher = new TextWatcher() {
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    public void onTextChanged(CharSequence s, int start, int before, int count) {
        if (s != null && s.toString().contains("@")) {
            editText.setText(s.toString().replace("@", ""));
            editText.setSelection(editText.getText().length());
        }
    }

    public void afterTextChanged(Editable s) {
    }
};

editText.addTextChangedListener(watcher);