Must the main screen of an Android application adhere to the single responsibility principle?

The Single Responsibility Principle (SRP) is not a mandatory requirement for the main screen of an Android application, but adhering to it significantly improves code quality and makes maintenance easier. The main screen often contains a lot of logic and UI components, so separating responsibilities helps make the code more modular and testable.

If the main screen violates SRP, it becomes bulky and difficult to understand and modify. It is recommended to move business logic to ViewModel or other components, and UI logic to separate classes or fragments.

An example of responsibility separation:

class MainActivity : AppCompatActivity() {
    private val viewModel: MainViewModel by viewModels()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        // UI logic
        viewModel.data.observe(this) { data ->
            // update UI
        }
    }
}

class MainViewModel : ViewModel() {
    val data = MutableLiveData<List<String>>()
    // business logic
}

Thus, SRP is a recommendation for improving architecture, not a strict requirement.