AdViewHelper.java

public class AdViewHelper {
    private static AdViewHelper Instance;

    private Context context;
    ConsentForm consentForm;
    AdView adView;


    public static AdViewHelper getInstance(Context context, AdView adView){
        if (Instance == null){
            Instance = new AdHelper(context, adView);
        }
        return Instance;
    }

    private AdViewHelper(final Context context, AdView adView){
        this.context = context;
        this.adView = adView;
        MobileAds.initialize(context);
        ConsentInformation consentInformation = ConsentInformation.getInstance(context);
        String[] publisherId = {context.getResources().getString(R.string.admob_pub_id)};
        consentInformation.requestConsentInfoUpdate(publisherId, new ConsentInfoUpdateListener() {
            @Override
            public void onConsentInfoUpdated(ConsentStatus consentStatus) {
                if (ConsentInformation.getInstance(context).isRequestLocationInEeaOrUnknown()){
                    switch (consentStatus){
                        case UNKNOWN:
                            showForm();
                            break;

                        case PERSONALIZED:
                            initAds(true);
                            break;

                        case NON_PERSONALIZED:
                            initAds(false);
                            break;
                    }
                }

            }

            @Override
            public void onFailedToUpdateConsentInfo(String reason) {

            }
        });
    }

    private void initAds(boolean personalized){
        AdRequest adRequest;
        if (personalized){
            adRequest = new AdRequest.Builder().build();
        }
        else {
            Bundle extras = new Bundle();
            extras.putString("npa", "1");
            adRequest = new AdRequest.Builder()
                    .addNetworkExtrasBundle(AdMobAdapter.class, extras)
                    .build();
        }
        adView.loadAd(adRequest);
    }

    private void showForm(){
        URL privacyUrl = null;
        try {
            privacyUrl = new URL(context.getString(R.string.privacy_url));
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        consentForm = new ConsentForm.Builder(context, privacyUrl)
                .withListener(new ConsentFormListener() {
                    @Override
                    public void onConsentFormLoaded() {
                        // Consent form loaded successfully.
                        consentForm.show();
                    }
                    @Override
                    public void onConsentFormOpened() {
                        // Consent form was displayed.
                    }
                    @Override
                    public void onConsentFormClosed(ConsentStatus consentStatus, Boolean userPrefersAdFree) {
                        // Consent form was closed.
                        if (consentStatus.equals(ConsentStatus.PERSONALIZED))
                            initAds(true);
                        else
                            initAds(false);
                    }
                    @Override
                    public void onConsentFormError(String errorDescription) {
                        // Consent form error. This usually happens if the user is not in the EU.

                    }
                })
                .withPersonalizedAdsOption()
                .withNonPersonalizedAdsOption()
                .build();

        consentForm.load();
    }
}