Moxy + Toothpick

BookActivity.kt

package ru.improvegroup.bookahut.presentation.ui.book

import android.os.Bundle
import android.widget.TextView
import android.widget.Toast
import butterknife.BindView
import butterknife.ButterKnife
import com.arellomobile.mvp.presenter.InjectPresenter
import com.arellomobile.mvp.presenter.ProvidePresenter
import ru.improvegroup.bookahut.R
import ru.improvegroup.bookahut.di.Scopes
import ru.improvegroup.bookahut.domain.entity.Book
import ru.improvegroup.bookahut.domain.entity.LongId
import ru.improvegroup.bookahut.presentation.common.mvp.MoxyActivity
import toothpick.Toothpick
import toothpick.config.Module
import javax.inject.Inject
import javax.inject.Provider

/**
 * Single book view.
 */
class BookActivity : MoxyActivity(), BookView {

    @BindView(R.id.text_title)
    lateinit var titleTextView: TextView
    @BindView(R.id.text_author)
    lateinit var authorTextView: TextView
    @BindView(R.id.text_section)
    lateinit var sectionTextView: TextView

    @InjectPresenter
    lateinit var presenter: BookPresenter
    @Inject
    lateinit var presenterProvider: Provider<BookPresenter>

    companion object {
        private val ARG_BOOK_ID = "ARG_BOOK_ID"

        fun buildArgs(bookId: Long): Bundle {
            return Bundle().also {
                it.putLong(ARG_BOOK_ID, bookId)
            }
        }
    }

    @ProvidePresenter
    fun providePresenter(): BookPresenter = presenterProvider.get()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_book)
        ButterKnife.bind(this)
    }

    override fun openScope() {
        val bookId = intent.getLongExtra(ARG_BOOK_ID, 0)

        val bookScope = Toothpick.openScopes(Scopes.APP_SCOPE, Scopes.BOOK_SCOPE)
        bookScope.installModules(object : Module() {
            init {
                bind(BookPresenter::class.java)
                bind(LongId::class.java).toInstance(LongId(bookId))
            }
        })
        Toothpick.inject(this, bookScope)
    }

    override fun closeScope() {
        Toothpick.closeScope(Scopes.BOOK_SCOPE)
    }

    override fun showError(message: String) {
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
    }

    override fun showBook(book: Book) {
        titleTextView.text = book.title
        authorTextView.text = book.author
        sectionTextView.text = book.section.name
    }
}

MoxyActivity.kt

package ru.improvegroup.bookahut.presentation.common.mvp

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import com.arellomobile.mvp.MvpDelegate

abstract class MoxyActivity : AppCompatActivity() {

    /**
     * @return The [MvpDelegate] used by this Activity.
     */
    val mvpDelegate: MvpDelegate<*> by lazy {
        MvpDelegate(this)
    }

    protected abstract fun openScope()

    protected open fun closeScope() {}

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        openScope()
        mvpDelegate.onCreate(savedInstanceState)
    }

    override fun onStart() {
        super.onStart()

        mvpDelegate.onAttach()
    }

    override fun onResume() {
        super.onResume()

        mvpDelegate.onAttach()
    }

    override fun onSaveInstanceState(outState: Bundle?) {
        super.onSaveInstanceState(outState)

        mvpDelegate.onSaveInstanceState(outState!!)
        mvpDelegate.onDetach()
    }

    override fun onStop() {
        super.onStop()

        mvpDelegate.onDetach()
    }

    override fun onDestroy() {
        super.onDestroy()

        mvpDelegate.onDestroyView()

        if (isFinishing) {
            closeScope()
            mvpDelegate.onDestroy()
        }
    }
}