Android lint error when upgrade to Android plugin 4.x

[dapengzhang0]

Trying to upgrade Android plugin to 4.x as described in #8421 (comment) with some minor workarounds, the build failed with a lint error:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':grpc-android-interop-testing:lint'.
> Lint found errors in the project; aborting build.
  
  Fix the issues identified by lint, or add the following to your build script to proceed with errors:
  ...
  android {
      lintOptions {
          abortOnError false
      }
  }
  ...
  Errors found:
  
  /Users/zdapeng/git/grpc-java/android-interop-testing/src/main/AndroidManifest.xml:23: Error: Class referenced in the manifest, io.grpc.binder.HostServices$HostService1, was not found in the project or the libraries [MissingClass]
          <service android:name="io.grpc.binder.HostServices$HostService1"/>
                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /Users/zdapeng/git/grpc-java/android-interop-testing/src/main/AndroidManifest.xml:24: Error: Class referenced in the manifest, io.grpc.binder.HostServices$HostService2, was not found in the project or the libraries [MissingClass]
          <service android:name="io.grpc.binder.HostServices$HostService2"/>
                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[dapengzhang0]

The binder service names in android-interop-testing/src/main were introduced in #8563

@markb74 Is there a way to fix or workaround it?

[markb74]

I'm ooo right now, but my guess is making the service classes non-inner classes would workaround the problem.

[dapengzhang0]

my guess is making the service classes non-inner classes would workaround the problem.

The service class is in project(':grpc-binder') and the android-interop-testing project does not have project(':grpc-binder') in its lintClasspath, so I think the lint check couldn't find the class .

I temporarily disabled lint for 'MissingClass' in https://github.com/grpc/grpc-java/pull/8808/files#diff-d9a8dd52c6811ac3eb0e4ed4d260817f55ce2b24ae9b629d4850373346415a6cR52 to workaround it.