onProductPurchased и onActivityResult, не вызванные после успешной покупки

Question

У меня есть кнопка покупки в моем приложении для Android, где я использую встроенную библиотеку биллинга Anjlab.Как только покупка прошла успешно, я хочу отправить запрос на сервер, который, в свою очередь, уведомил бы меня.

Но я так и не смог добраться до функции "onProductPurchased".После исследования я обнаружил, что мне нужно вызвать onActivityResult.Но даже это не получается.

Одним из решений для получения onActivityResult было его переопределение, но все равно некуда.Пожалуйста, найдите код ниже и предложите мне, что нужно сделать, чтобы после успешной покупки я мог позвонить бэкэнду.

public class QuestionPrice extends Fragment implements View.OnClickListener, BillingProcessor.IBillingHandler{

private static final String PRODUCT_ID = "prod_00001";
private static final String PRODUCT_ID2 = "prod_00002";
private int paymentmade;
private String paymentdone;
ArrayList<String> arrayListOfProductIds;
private static final String LICENSE_KEY = "PUT YOUR MERCHANT KEY HERE";
private static final String MERCHANT_ID=null;
private static final String TAG = "Askquest";
private BillingProcessor bp;
private boolean readyToPurchase = false;
Button buybutton;
Button buybuttonReport;
private boolean purchased;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_question_price, container, false);
    buybutton = (Button) view.findViewById(R.id.buybutton);
    buybuttonReport = (Button) view.findViewById(R.id.buybuttonReport);
    buybutton.setOnClickListener(this);
    buybuttonReport.setOnClickListener(this);
    return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    if(!BillingProcessor.isIabServiceAvailable(getActivity())) {
        Toast.makeText(getActivity(), "In-app billing service is unavailable, please upgrade Android Market/Play to version >= 3.9.16", Toast.LENGTH_SHORT).show();
    }

    bp = new BillingProcessor(getActivity(), LICENSE_KEY, MERCHANT_ID,this);
    SkuDetails skuDetails = bp.getPurchaseListingDetails("PRODUCT_ID");
    getActivity().setTitle("Products");
}


@Override
public void onClick(View v) {
    SharedPreferences msharedprefs = getActivity().getSharedPreferences("sharedprefdata", MODE_PRIVATE);
    SharedPreferences.Editor editor = msharedprefs.edit();
    switch (v.getId()) {
        case R.id.buybutton:
    if (bp.loadOwnedPurchasesFromGoogle() && bp.isPurchased(PRODUCT_ID)) {
        boolean loadOwnedPurchasesFromGoogle = bp.loadOwnedPurchasesFromGoogle();
        boolean isPurchased = bp.isPurchased(PRODUCT_ID);

        TransactionDetails premiumTransactionDetailss = bp.getPurchaseTransactionDetails(PRODUCT_ID);

        Log.i("Transaction Details ", " TT Details " + premiumTransactionDetailss);
        if (purchased) {
             Toast.makeText(getActivity(), "You have already purchased a question.", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(getActivity(), "Purchase Initiated", Toast.LENGTH_SHORT).show();
            bp.purchase(getActivity(), PRODUCT_ID);
            TransactionDetails premiumTransactionDetails2 = bp.getPurchaseTransactionDetails(PRODUCT_ID);
            purchased = bp.isPurchased(PRODUCT_ID);
            Log.i("TAG", "isPurchased" + purchased);
            if (purchased) {
                Log.i("TAG", "Congratulations!!! Purchase Successfull");
                Toast.makeText(getActivity(), "Congratulations!!! Purchase Successfull", Toast.LENGTH_SHORT).show();
            }
        }
    }
            break;

        case R.id.buybuttonReport:
            TransactionDetails premiumTransactionDetails2 = bp.getPurchaseTransactionDetails(PRODUCT_ID2);
            Log.i("Transaction Details ", " TT Details "+premiumTransactionDetails2);
            if (bp.loadOwnedPurchasesFromGoogle() && bp.isPurchased(PRODUCT_ID2))
            {
                boolean loadOwnedPurchasesFromGoogle = bp.loadOwnedPurchasesFromGoogle();
                boolean  isPurchased = bp.isPurchased(PRODUCT_ID2);
                TransactionDetails premiumTransactionDetailss = bp.getPurchaseTransactionDetails(PRODUCT_ID2);
                Log.i("Transaction Details ", " TT Details "+premiumTransactionDetailss);
               Log.i("TAG", ""+msharedprefs.getInt("reportQues", -1));

                Toast.makeText(getActivity(), "You have already purchased a report.", Toast.LENGTH_SHORT).show();
            }
            else
            {
             Toast.makeText(getActivity(), "Purchase Initiated", Toast.LENGTH_SHORT).show();
             bp.purchase(getActivity(), PRODUCT_ID2);
             purchased = bp.isPurchased(PRODUCT_ID2);
             if ( purchased)
             {
                 Log.i("TxnDetails : ","TxnDetails : "+premiumTransactionDetails22.purchaseInfo.purchaseData.orderId.toString());
             }
                Log.i("TAG", "isPurchased"+purchased );
            }
            break;
    }
}

@Override
public void onProductPurchased(@NonNull String productId, @Nullable TransactionDetails details) {

    SharedPreferences msharedprefs = getActivity().getSharedPreferences("sharedprefdata", MODE_PRIVATE);
    SharedPreferences.Editor editor = msharedprefs.edit();
    String userid = msharedprefs.getString("userid", null);
    String username = msharedprefs.getString("username", null);

    Toast.makeText(getActivity(), "On Product Purchased", Toast.LENGTH_SHORT).show();
    Log.i("TAG", "On Product Purchased" );

    purchased = bp.isPurchased(PRODUCT_ID2);
    if ( purchased) {
        Toast.makeText(getActivity(), "Congratulations!!! Purchase Successfull", Toast.LENGTH_SHORT).show();
        Log.i("TAG", "Button Clicked Product Purchased" );
        Toast.makeText(getActivity(), "Button Clicked Product Purchased", Toast.LENGTH_SHORT).show();
    }
    editor.putInt("paymentdone", 1);
    editor.commit();
    purchasemade(userid);

}

@Override
    public void onPurchaseHistoryRestored() {
    Log.i("TAG", "Button Clicked Product History Restored" );
   Toast.makeText(getActivity(), "Button Clicked Product History Restored", Toast.LENGTH_SHORT).show();
    editor.putInt("paymentdone", 0);
    editor.commit();

}

@Override
public void onBillingError(int errorCode, @Nullable Throwable error) {
    Toast.makeText(getActivity(), "Button Clicked Billing Error", Toast.LENGTH_SHORT).show();
    Log.i("TAG", "Button Clicked Billing Error" );
    editor.putInt("paymentdone", 0);
    editor.commit();
}

@Override
public void onBillingInitialized() {
    Toast.makeText(getActivity(), "Billing Initialized", Toast.LENGTH_SHORT).show();
    readyToPurchase = true;
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (!bp.handleActivityResult(requestCode, resultCode, data)) {
        super.onActivityResult(requestCode, resultCode, data);
        FragmentManager fragmentManager = getFragmentManager();
        Fragment fragment = fragmentManager.findFragmentByTag("Products");
        Toast.makeText(getActivity(), "Inside On Activity Result", Toast.LENGTH_SHORT).show();
        Log.i("TAG", "Inside On Activity Result" );
        if (fragment != null)
        {
            ((QuestionPrice)fragment).onActivityResult(requestCode, resultCode, data);
        }
    }
}

@Override
public void onDestroy() {
    if (bp != null) {
        bp.release();
    }
    super.onDestroy();
}

private void purchasemade(String userid) {
    Log.i("TAG", "Inside Purchase Made" );
    Toast.makeText(getActivity(), "Inside Purchase Made", Toast.LENGTH_SHORT).show();
}
}

Я попытался сделать несколько шагов из других похожих вопросов, опубликованных в SO, но ни один из них не сработал.