This is a simple example of setting up Dagger 2 in a Android application. The example exhibits the use of different components with a shared subset of modules. For example, CommandSimple is provided via CommandModule which can be included in different Components, in this case only SubActivityComponent is doing so though. ModelOne is provided in both SubActivityComponent and ActvityComponent Since each are scoped the same, yet included in different componets, we actually have two different instances. That said, bit SecondActivity and ThirdActivity share an instance.