如何在android中让编辑文本只接受字母

<EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textPersonName"
    android:hint="Enter letters only" />

InputFilter filter = new InputFilter() {
    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        StringBuilder sb = new StringBuilder();
        for (int i = start; i < end; i++) {
            char c = source.charAt(i);
            if (Character.isLetter(c)) {
                sb.append(c);
            }
        }
        return sb.toString();
    }
};

EditText editText = findViewById(R.id.editText);
editText.setFilters(new InputFilter[]{filter});

EditText editText = findViewById(R.id.editText);
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) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (Character.isLetter(c)) {
                sb.append(c);
            }
        }
        editText.setText(sb.toString());
        editText.setSelection(sb.toString().length());
    }

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