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Follow these instructions to add an interstitial ad to the free version. Display the add after the user hits the button, but before the joke is shown.

https://developers.google.com/mobile-ads-sdk/docs/admob/android/interstitial

Add free and paid product flavors to your app. Remove the ad (and any dependencies you can) from the paid flavor.

Create an Android Library containing an Activity that will display a joke passed to it as an intent extra. Wire up project dependencies so that the button can now pass the joke from the Java Library to the Android Library.

For review on how to create an Android library, check out demo 4.03. For a refresher on intent extras, check out;

http://developer.android.com/guide/components/intents-filters.html

Add a loading indicator that is shown while the joke is being retrieved and disappears when the joke is ready. The following tutorial is a good place to start:

http://www.tutorialspoint.com/android/android_loading_spinner.htm

To tie it all together, create a Gradle task that:

1. Launches the GCE local development server
2. Runs all tests
3. Shuts the server down again

This next task will be pretty tricky. Instead of pulling jokes directly from our Java library, we'll set up a Google Cloud Endpoints development server, and pull our jokes from there. Follow the instructions in the following tutorial to add a Google Could Endpoints module to your project:

https://github.com/GoogleCloudPlatform/gradle-appengine-templates/tree/master/HelloEndpoints

Introduce a project dependency between your Java library and your GCE module, and modify the GCE starter code to pull jokes from your Java library. Create an Async task to retrieve jokes. Make the button kick off a task to retrieve a joke, then launch the activity from your Android Library to display it.

Create a new Gradle Java project either using the Android Studio wizard, or by hand. Then introduce a project dependency between your app and the new Java Library. If you need review, check out demo 4.01 from the course code.

Make the button display a toast showing a joke retrieved from your Java joke telling library.

Add code to test that your Async task successfully retrieves a non-empty string. For a refresher on setting up Android tests, check out demo 4.09.