在 BillingClient 设置中 .setListener(this) 引用我的调用活动而不是 PurchasesUpdatedListener

Question

The docs show the following for setting up a Billingclient.

private BillingClient billingClient;
...
billingClient = BillingClient.newBuilder(activity).setListener(this).build();  

In .setListener(this), the 'this' part is supposed to reference a PurchasesUpdatedListener, even though you don't explicitly create one to put in these parenthesis. Apparently just using 'this' is supposed to be enough. In the docs and all the examples I've seen, a PurchasesUpdatedListener is never created to put here, it just uses 'this', apparently self-referencing the billingclient being created. This hasn't worked for me though, and I keep getting:

Should I use something else for the (activity) part than (getApplicationContext())? I've tried (this) and various other things here as just the word 'activity' isn't recognized.

Answer 1

Instead setListener(this) put setListener(new PurchasesUpdatedListener(){... }) and implement the required methods (usually AndroidStudio does it automatically)

Or

add .. implements PurchasesUpdatedListener at the end of your MainActivity declaration

the same thing as you can do on many listeners, for example the well known OnClickListener