MvRx

Mavericks

• Mavericks is a MVI-framework

Simplest screen

/** State classes contain all of the data you need to render a screen. */
data class CounterState(val count: Int = 0) : MavericksState

/** ViewModels are where all of your business logic lives. It has a simple lifecycle and is easy to test. */
class CounterViewModel(initialState: CounterState) : MavericksViewModel<CounterState>(initialState) {
    fun incrementCount() = setState { copy(count = count + 1) }
}

/**
 * Fragments in Mavericks are simple and rarely do more than bind your state to views.
 * Mavericks works well with Fragments but you can use it with whatever view architecture you use.
 */
class CounterFragment : Fragment(R.layout.counter_fragment), MavericksView {
    private val viewModel: CounterViewModel by fragmentViewModel()

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        counterText.setOnClickListener {
            viewModel.incrementCount()
        }
    }

    override fun invalidate() = withState(viewModel) { state ->
        counterText.text = "Count: ${state.count}"
    }
}

Core Concepts

Mastering Mavericks only requires using three classes

• MavericksState
• MavericksViewModel
• MavericksView

MavericksState

• This is the first step in creating a Screen by modeling it as a function of state.
• The Mavericks state doesn't do anything but signal the intention of your class to be used as a state.