What is _not_ a good way to reuse Android code?

Which layout is best for large, complex hierarchies?

You need to upgrade to the latest version of the Android Gradle plugin. Which file should you modify?

Why do developers often put app initialization code in the Application class?

What folder should you use for your app's launcher icons?

When should you use the androidTest directory to store your test classes?

You need to retrieve a list of photos from an API. Which code snippet defines an HTML GET request in Retrofit?

To persist a small collection of key-value data, what should you use?

You need to get a list of devices that are attached to your computer with USB debugging enable. Which command would execute using the Android Debug Bridge?

Why is it problematic to define sizes using pixels on Android?

How would you retrieve the value of a user's email from SharedPreferences while ensuring that the returned value is not null?