ExzileGames.AndroidBillingBridge 1.0.10

AndroidBillingBridge

A Java bridge + C# interop library for Google Play Billing Library on .NET Android. Provides direct access to the full Billing API without reflection hacks or incomplete NuGet bindings.

Problem

The Xamarin.Android.Google.BillingClient NuGet bindings have issues with certain API surfaces — missing method overloads, parameter order inconsistencies, and types that require reflection to invoke. This forces developers to write fragile reflection-based code to call basic operations like ConsumeAsync and QueryProductDetailsAsync.

Solution

This library compiles a Java bridge class directly into your Android project. The Java class calls the Billing Library APIs natively, and C# communicates via auto-generated JNI bindings. No reflection needed.

APIs Exposed

Setup

1. Add project reference

<ProjectReference Include="..\AndroidBillingBridge\AndroidBillingBridge.csproj" />

2. Initialize in your Activity

using AndroidBillingBridge.Interop;

protected override void OnCreate(Bundle? savedInstanceState)
{
    base.OnCreate(savedInstanceState);

    var billing = new AndroidBillingBridgeImpl(this);
    BillingBridgeManager.SetImplementation(billing);
}

3. Use from shared code

using AndroidBillingBridge.Interop;

// Connect
var conn = await BillingBridgeManager.ConnectAsync();

// Query products (with real prices from Google Play)
var products = await BillingBridgeManager.QueryInAppProductsAsync(
    ["redchest500", "redchest2000"]);

if (products.Success)
{
    foreach (var p in products.Products!)
        Console.WriteLine($"{p.Name}: {p.OneTimePurchaseOfferDetails?.FormattedPrice}");
}

// Set purchase listener
BillingBridgeManager.SetPurchaseListener(result =>
{
    if (result.ResponseCode == 0 && result.Purchases != null)
    {
        foreach (var purchase in result.Purchases)
        {
            // Consume or acknowledge
            _ = BillingBridgeManager.ConsumeAsync(purchase.PurchaseToken);
        }
    }
});

// Launch purchase
BillingBridgeManager.LaunchPurchaseFlow("redchest500");

// Query existing purchases (restore)
var existing = await BillingBridgeManager.QueryInAppPurchasesAsync();

What this replaces

The existing AndroidInAppPurchaseService uses reflection to work around binding issues:

// BEFORE: reflection hacks
var method = billingClient.GetType().GetMethods()
    .Where(m => m.Name == "ConsumeAsync" || m.Name == "Consume")...
method.Invoke(billingClient, args);

// AFTER: direct bridge call
var result = await BillingBridgeManager.ConsumeAsync(purchaseToken);

License

MIT