I get the following exception when I use PurchaseAsync in my Android project:

  var purchase = await billing.PurchaseAsync(productId, ItemType.InAppPurchase);

excep {System.NullReferenceException: Current Activity is null, ensure that the MainActivity.cs file is configuring Xamarin.Essentials in your source code so the In App Billing can use it. at Plugin.InAppBilling.InAppBillingImplementation.get_Activity() in D:\a\1\…}

Image exception

But I don't use Xamarin.Essentials anymore. I migrated from In-App Billing Plugin 4.0.2 to 6.7.0 and I use Microsoft.Maui.Essentials now. I have only tested In-App Billing Plugin 6.7.0 in my Android project, I have not yet tested in my iOS project.

Image Dependencies

What should I do in my Activity1.cs?

    protected override void OnCreate(Bundle bundle)
    {
        base.SetTheme(Resource.Style.MainTheme);
        base.OnCreate(bundle);
    //  Xamarin.Essentials.Platform.Init(this, bundle); old code from version 4.0.2

What should I do to avoid the exception?

CodePudding user response：

The Xamarin.Essentials is for the Xamarin.Forms project, and for the Maui project, you can try to use the following code in the MainActivity or the Activity1:

protected override void OnCreate(Bundle bundle)
    {
        base.SetTheme(Resource.Style.MainTheme);
        base.OnCreate(bundle);
        Microsoft.Maui.ApplicationModel.Platform.Init(this,bundle);
   }

Or you can use the following code in the MainActivity or the Activity1 according to the plugin document on the github:

protected override void OnCreate(Bundle bundle)
    {
        base.SetTheme(Resource.Style.MainTheme);
        base.OnCreate(bundle);
        var activity = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity;
        var context = Microsoft.Maui.ApplicationModel.Platform.AppContext;
    }

In addition, there is a similar issue about some errors after migrating from 4.0.2 to 6.7.0 on the github, you can follow up it.