Subscription.java

public class HomeActivity extends BaseActivity implements BillingProcessor.IBillingHandler {

	//This is for in-app subscription
    BillingProcessor billingProcessor;
    boolean IsInAppBillSetUpOk = false;
    boolean isItemSubscribed = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        activity = HomeActivity.this;
        
        ButterKnife.bind(this);

        if (Utils.isNetworkAvailable(activity)) {
            initializeInAppBillingProcess();
        } else {
            Utils.internetAlertDialog(activity);
        }
    }

    private void initializeInAppBillingProcess() {
        try {

            billingProcessor = new BillingProcessor(activity, AppConstant.InApp.BASE64PUBLIC_KEY, this);
            boolean isAvailable = billingProcessor.isIabServiceAvailable(activity);

            if (isAvailable) {
                IsInAppBillSetUpOk = true;
            } else {
                IsInAppBillSetUpOk = false;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //When i make request for subscription at that time this methot is called
    private void startInAppSubscriptionProcess() {
        if (IsInAppBillSetUpOk) {
            billingProcessor.subscribe(activity, AppConstant.InApp.SKU_LOCATION_ID);
        } else {
        	Log.e(TAG, "in-app not supported");
        }
    }


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

    @Override
    public void onPurchaseHistoryRestored() {

    }

    @Override
    public void onBillingError(int errorCode, @Nullable Throwable error) {
        Utils.inAppFail(activity, errorCode);
    }

    @Override
    public void onBillingInitialized() {

    }

    private void updatePurchase() {
        if (billingProcessor != null) {

            try {
                billingProcessor.loadOwnedPurchasesFromGoogle();
            } catch (Exception e) {
                e.printStackTrace();
            }

            try {
                if (billingProcessor.isSubscribed(AppConstant.InApp.SKU_LOCATION_ID)) {
                    getSKUDetail();
                   
                } else {
                    Log.e(TAG, "item not isSubscribed or something went's wrong, please try agin");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        } else {
            Log.e(TAG, "billingProcessor is null");
        }
    }


    private void getSKUDetail() {
        try {
            if (billingProcessor != null) {
               

                try {
                    SkuDetails skuDetails = billingProcessor.getSubscriptionListingDetails(AppConstant.InApp.SKU_LOCATION_ID);
                    if (skuDetails != null) {
                        Log.e(TAG, "skuDetails is not null");

                        Log.e(TAG, "transactionDetails is below");
                        String productId = skuDetails.productId;
                        String title = skuDetails.title;
                        String description = skuDetails.description;
                        String currency = skuDetails.currency;
                        String priceText = skuDetails.priceText;
                        String introductoryPriceText = skuDetails.introductoryPriceText;
                        String introductoryPricePeriod = skuDetails.introductoryPricePeriod;
                        String subscriptionPeriod = skuDetails.subscriptionPeriod;
                        String subscriptionFreeTrialPeriod = skuDetails.subscriptionFreeTrialPeriod;

                        Log.i(TAG, "productId = " + productId);
                        Log.i(TAG, "title = " + title);
                        Log.i(TAG, "description = " + description);
                        Log.i(TAG, "currency = " + currency);
                        Log.i(TAG, "priceText = " + priceText);
                        Log.i(TAG, "introductoryPriceText = " + introductoryPriceText);
                        Log.i(TAG, "introductoryPricePeriod = " + introductoryPricePeriod);
                        Log.i(TAG, "subscriptionPeriod = " + subscriptionPeriod);
                        Log.i(TAG, "subscriptionFreeTrialPeriod = " + subscriptionFreeTrialPeriod);

                    } else {
                        Log.e(TAG, "skuDetails is null");
                    }
                }catch (Exception e){
                    e.printStackTrace();
                }
            }else{
                Log.e(TAG, "billingProcessor is null");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}