Creating a spinner for choosing country code

Question

I want to create a spinner for selecting a country and getting its country code.

I already found this item list:

Answer 1

in gradle :

    // country picker
    implementation 'com.hbb20:ccp:1.7.1'

in XML

in Activity :

CountryCodePicker ccp;
ccp = findViewById(R.id.ccp);
    public void onCountryPickerClick(View view) {
        ccp.setOnCountryChangeListener(new CountryCodePicker.OnCountryChangeListener() {
            @Override
            public void onCountrySelected() {
                //Alert.showMessage(RegistrationActivity.this, ccp.getSelectedCountryCodeWithPlus());
                selected_country_code = ccp.getSelectedCountryCodeWithPlus();
            }
        });
    }