[in_app_purchase_android] Add showInAppMessages support (#107412)

[fingerart]

As mentioned in #107412, a new native feature (showInAppMessages) has been added.

final androidPlatformAddition = InAppPurchase.instance.getPlatformAddition<InAppPurchaseAndroidPlatformAddition>();
final result = await androidPlatformAddition.showInAppMessages();

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[gemini-code-assist]

Code Review

This pull request adds support for the showInAppMessages API from the Google Play Billing Library. This includes defining the new API in Pigeon, implementing it on the Android native side, adding Dart wrappers, and updating the example app to demonstrate its usage. Tests for the new functionality have also been added.

[fingerart]

@stuartmorgan-g @GaryQian What else do I need to do?

[stuartmorgan-g]

@fingerart You need to wait for a review, which as our docs explain takes up to a couple of weeks.

[fingerart]

There are 6 failed checks, what do I need to do about it?

[stuartmorgan-g]

There are 6 failed checks, what do I need to do about it?

You can see the task output by going to View details -> View more details on flutter-dashboard -> stdout.

In this case they are all analyzer failures, which should trivially show up locally in any IDE configured to read repo-local analysis options.

[fingerart]

I have fixed the error checking item.

[gmackall]

Mostly lgtm, one question about future proofing re: the categories of message to show.

Also, it would be good to add a test to packages/in_app_purchase/in_app_purchase_android/test/in_app_purchase_android_platform_addition_test.dart as the other methods of in_app_purchase_android_platform_addition.dart are also tested there

something like

  group('showInAppMessages', () {
    test('showInAppMessages success', () async {
      const expected = InAppMessageResultWrapper(
        responseCode: InAppMessageResponse.subscriptionStatusUpdated,
        purchaseToken: 'dummy purchase token',
      );

      when(mockApi.showInAppMessages()).thenAnswer(
        (_) async => PlatformInAppMessageResult(
          responseCode: PlatformInAppMessageResponse.subscriptionStatusUpdated,
          purchaseToken: expected.purchaseToken,
        ),
      );

      final InAppMessageResultWrapper result =
          await iapAndroidPlatformAddition.showInAppMessages();

      expect(result, equals(expected));
    });
  });

[fingerart]

I added the showInAppMessages success test to packages/in_app_purchase/in_app_purchase_android/test/in_app_purchase_android_platform_addition_test.dart.

[gmackall]

lgtm, @bparrishMines would you like to do the secondary review?

[bparrishMines]

LGTM with a couple nits

[bparrishMines]

@fingerart This needs to merge in the main branch and handle merging the pigeon Kotlin update. This PR doesn't allow maintainers to make changes, so I can't do this for you.

[fingerart]

@bparrishMines I have updated to Kotlin.

[bparrishMines]

This looks good. I think the version bump got messed up with the kotlin merge. The pubspec version needs to updated along with my comments in the changelog.

[flutter-dashboard]

This pull request is not mergeable in its current state, likely because of a merge conflict. Pre-submit CI jobs were not triggered. Pushing a new commit to this branch that resolves the issue will result in pre-submit jobs being scheduled.

[bparrishMines]

LGTM