ExzileGames.AndroidBillingBridge 1.0.25

AndroidBillingBridge

A Java bridge + C# interop library for Google Play Billing Library v8 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 binding has issues with certain API surfaces — missing method overloads, parameter type 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 NuGet package

dotnet add package ExzileGames.AndroidBillingBridge

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 to the billing service
var conn = await BillingBridgeManager.ConnectAsync();

// Query products (returns 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}");
}

// Listen for purchase results
BillingBridgeManager.SetPurchaseListener(result =>
{
    if (result.ResponseCode == 0 && result.Purchases != null)
    {
        foreach (var purchase in result.Purchases)
            _ = BillingBridgeManager.ConsumeAsync(purchase.PurchaseToken);
    }
});

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

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

What This Replaces

// BEFORE: reflection hacks required by the raw binding
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