MVP패턴 (+BaseActivity, BasePresenter, BaseView)

MVP패턴 (+BaseActivity, BasePresenter, BaseView)

NumPicker Sample App 만들 때 사용: https://github.com/lipnus/picker

Google Kotlin MVP todo Sample:https://github.com/googlesamples/android-architecture/tree/todo-mvp-kotlin/

BaseActivity.kt

open class BaseActivity : AppCompatActivity() {

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


    //프레퍼런스에서 불러오기
    open fun getStringPref(key: String):String {
        return PreferenceHelper.customPrefs(applicationContext, getString(R.string.PREF)).getString(key, "empty")
    }

    //프레퍼런스에 저장
    open fun saveStringPref(key:String, value:String) {
        PreferenceHelper.customPrefs(applicationContext, getString(R.string.PREF)).edit().putString(key, value).apply()
    }

}

BasePresenter.kt

interface BasePresenter{

    fun start()
}

BaseView.kt

interface BaseView<T>{

    var presenter: T

    fun initLayout()

    fun getStringPref(key: String):String
    fun saveStringPref(key:String, value:String)

}

MainContract.kt

interface MainContract{

    interface View: BaseView<Presenter> {

        fun initViewPager()

        fun setPageIndex(index: Int)

    }


    interface Presenter: BasePresenter {

        fun initDatabase()
        fun isDatabaseInited():Boolean

    }
}

MainPresenter.kt

class MainPresenter(private val mainView: MainContract.View): MainContract.Presenter{


    override fun start() {

        mainView.initLayout()
        mainView.initViewPager()

        initDatabase()
    }


    //최초실행 시 Database를 초기화한다.
    override fun initDatabase() {

        if( ! isDatabaseInited()){
 
 
        }
    }


    override fun isDatabaseInited():Boolean {

        if(mainView.getStringPref("DATABASE_INIT") == "empty"){
            mainView.saveStringPref("DATABASE_INIT", "inited")
            return false
        }
        return true
    }
}

MainActivity.kt

class MainActivity :
    BaseActivity(),
    MainContract.View,
    FirstFragment.OnFragmentInteractionListener{


    override lateinit var presenter: MainContract.Presenter


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)


        presenter = MainPresenter(this)
        presenter.start()

    }


    override fun initLayout(){
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)

    }

    override fun initViewPager() {

        val mainAdapter = MainPagerAdapter(supportFragmentManager)

        var firstFragment: FirstFragment = FirstFragment.newInstance("파라미터: 첫번재")
        var secondFragment: SecondFragment = SecondFragment.newInstance("파라미터: 두번째")
        var thirdFragment: ThirdFragment = ThirdFragment.newInstance("파라미터: 세번째")


        mainAdapter.run {
            addFragement(firstFragment,"첫번째")
            addFragement(secondFragment,"두번째")
            addFragement(thirdFragment,"세번째")
        }
        viewpager.adapter = mainAdapter

        viewpager?.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {

            override fun onPageScrollStateChanged(state: Int) {
            }

            override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {

            }
            override fun onPageSelected(position: Int) {
                navigation.menu.getItem(position).setChecked(true)
            }

        })

    }


    override fun setPageIndex(index: Int) {
        viewpager?.currentItem = index
    }


    private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
        when (item.itemId) {
            R.id.navigation_first -> {
                setPageIndex(0)
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_second -> {
                setPageIndex(1)
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_third -> {
                setPageIndex(2)
                return@OnNavigationItemSelectedListener true
            }
        }
        false
    }


    override fun onFragmentInteraction(msg: String) {

    }