If I have 10 - 20 classes, then I need to create 10 - 20 controllers and models? Or are there other ways to reduce the number of controllers and models?

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What classes? In Android, the activation or fragment is usually used as a controller. And the model is essentially where the data comes from and, for example, a database or from the Internet. It is customary for such options to create one model for the entire application.