Can someone help me with the code in android studio

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C++

Java

This code is from codecanyon. I try to contact the author, but no respond. So I hope someone here can help. Now the app calculate the base delivery fee + the charge per KM. I want to make it if charge per KM is lower than base delivery fee, then base delivery fee will be preferred. If charge per KM lower than base delivery fee, then charge per KM amount will be use for delivery fee. Below are the code.


//update total/order amount summary
updateTotalOrderSummary() async {
//delivery fee
if (!isPickup && deliveryAddress != null) {
//selected delivery address is within range
if (!delievryAddressOutOfRange) {
//vendor charges per km
setBusy(true);
try {
double orderDeliveryFee = await checkoutRequest.orderSummary(
deliveryAddressId: deliveryAddress.id,
vendorId: vendor.id,
);

//adding base fee
checkout.deliveryFee = orderDeliveryFee;
} catch (error) {
if (vendor.chargePerKm != null && vendor.chargePerKm == 1) {
checkout.deliveryFee =
vendor.deliveryFee * deliveryAddress.distance;
} else {
checkout.deliveryFee = vendor.deliveryFee;
}

//adding base fee
checkout.deliveryFee += vendor.baseDeliveryFee;
}
}

//
setBusy(false);
} else {
checkout.deliveryFee = 0.00;
}
} else {
checkout.deliveryFee = 0.00;
}

What I have tried:

//adding base fee
//checkout.deliveryFee += vendor.baseDeliveryFee;
if (checkout.deliveryFee < vendor.baseDeliveryFee) {
checkout.deliveryFee = vendor.baseDeliveryFee;
} else {
checkout.deliveryFee = vendor.deliveryFee * deliveryAddress.distance;