Plugin and example app need to include the same dependencies to generate bindings of 3rd party library

[orestesgaolin]

This is similar to #1660 but affects the flow only once.

When I was trying to generate bindings to com.google.android.play:app-update it was not enough to add it as dependency to build.gradle of the plugin. Only after I added it to example app's build.gradle the bindings got generated correctly.

See example files below:

• jnigen.yaml
• plugin's build.gradle
• example app's build.gradle

Ideally adding the dependency just to the plugin build.gradle should be enough for the jnigen to pick up the classes.

[HosseinYousefi]

Somehow our gradle script does not pick up the transitive dependencies. Cronet has the same issue: https://github.com/dart-lang/http/blob/master/pkgs/cronet_http/example/android/app/build.gradle#L75-L78

I did some tinkering but couldn't fix it, maybe a gradle expert can help us.