Simple way to implement the MVP pattern

MVPImplementation

interface BaseContract {

    showProgress()
    hideProgress()
}


interface Contract extends BaseContract {

    interface View {
        populate(models: [Model])
    }

    interface Service {
        load()
    }
}

class Activity implements Contract.View {

    presenter: Presenter

    onCreate() {
        this.presenter = Presenter(this)
    }

    onResume() {
        this.presenter.load()
    }

    populate(models: [Model]) {
        // popula a lista
    }
}

class Presenter implements Contract.Service {

    view: Contract.View

    constructor(view: Contract.View) {
        this.view = view
    }

    load() {
        this.view.showProgress()
        // carrega
        this.view.hideProgress()
        this.view.populate(models)
    }
}