Life without Fragments Evgeny Shishkin @johnkil 

Why Fragments? 

Fragments 

Single Activity 

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FragmentManager + IllegalStateException 

public empty constructor 

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github.com/JetradarMobile/multibackstack 

Alternative? 

Advocating Against Android Fragments by Square 

View-based App 

Flow (square) Conductor (bluelinelabs) Scoop (lyft) Pancakes (mattlogan) Pilot (doridori) Triad (nhaarman) Screenplay (weefbellington) 

Screenplay 

Screenplay Stage Rigger Component #1 Component #2 Create setUp tearDown Destroy 

Screenplay class LoginStage(val app: ScreenplayApp) : XmlStage() {
 val rigger by lazy { CrossFadeRigger(app) }
 
 init {
 addComponents(SignInComponent(app))
 }
 
 override fun getLayoutId(): Int {
 return R.layout.stage_login
 }
 
 override fun getRigger(): Stage.Rigger {
 return rigger
 }
 
 private class SignInComponent(val app: ScreenplayApp) : Component {
 override fun afterSetUp(stage: Stage, isInitializing: Boolean) {
 val signInButton = stage.view.findViewById(R.id.sign_in_button)
 signInButton.setOnClickListener { signIn() }
 }
 
 private fun signIn() {
 app.appFlow.set(WelcomeStage(app))
 }
 
 override fun beforeTearDown(stage: Stage, isFinishing: Boolean) {
 }
 }
 } 

Triad 

Triad Presenter Container Screen View Create onCreate onAttach Destroy onDetach onDestroy 

Triad class LoginScreen : Screen() {
 
 override val layoutResId = R.layout.screen_login
 
 override fun createPresenter(viewId: Int) = LoginPresenter(applicationComponent.triad)
 }
 
 interface LoginContainer : Container {
 fun setUpEmail(email: String)
 fun setUpPassword(password: String)
 }
 
 class LoginPresenter(private val triad: Triad) : BasePresenter() {
 
 fun signInButtonClicked() {
 triad.goTo(WelcomeScreen())
 }
 }
 
 class LoginView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyle: Int = 0) :
 LinearLayoutContainer(context, attrs,
 defStyle), LoginContainer {
 
 override fun onFinishInflate() {
 super.onFinishInflate()
 signInButton.setOnClickListener { presenter.signInButtonClicked() }
 }
 
 override fun setUpEmail(email: String) {
 emailEdit.setText(email)
 }
 
 override fun setUpPassword(password: String) {
 passwordEdit.setText(password)
 }
 } 

Pilot 

Pancakes 

Pancakes ViewStack UIContainer Previous view Next view LayoutId 

Pancakes class LoginView(context: Context, attrs: AttributeSet) : LinearLayout(context, attrs) {
 
 override fun onFinishInflate() {
 super.onFinishInflate()
 if (isInEditMode) return
 
 val signInButton = findViewById(R.id.sign_in_button)
 signInButton.setOnClickListener { signIn() }
 }
 
 private fun signIn() {
 val viewStack = (context as ViewStackActivity).viewStack()
 viewStack.pushWithAnimation(R.layout.view_welcome, CircularReveal())
 }
 } 

Scoop 

Scoop • Screen • Router • ViewController • Layout • Transitions 

Scoop Router UIContainer Previous view Next view Screen Route change 

Scoop @EnterTransition(FadeTransition::class)
 @ExitTransition(FadeTransition::class)
 @Controller(LoginController::class)
 class LoginScreen : Screen()
 
 class LoginController : ViewController() {
 override fun layoutId() = R.layout.screen_login
 
 override fun onAttach() {
 val signInButton = view.findViewById(R.id.sign_in_button)
 signInButton.setOnClickListener { signIn() }
 }
 
 private fun signIn() {
 router.goTo(WelcomeScreen())
 }
 } 

Conductor 

Conductor 

Conductor • Controller • Router • RouterTransaction • ControllerChangeHandler 

Conductor class LoginController : Controller() {
 
 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup): View {
 val view = inflater.inflate(R.layout.controller_login, container, false)
 val signInButton = view.findViewById(R.id.sign_in_button)
 signInButton.setOnClickListener { signIn() }
 return view
 }
 
 private fun signIn() {
 router.pushController(RouterTransaction.with(WelcomeController())
 .pushChangeHandler(SimpleSwapChangeHandler())
 .popChangeHandler(SimpleSwapChangeHandler()))
 }
 } 

Conductor + Mosby 

Conductor + Mosby class LoginController : MvpController(), LoginView {
 
 override fun createPresenter() = LoginPresenter()
 
 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup): View {
 val view = inflater.inflate(R.layout.controller_login, container, false)
 val signInButton = view.findViewById(R.id.sign_in_button)
 signInButton.setOnClickListener { presenter.signInButtonClicked() }
 return view
 }
 
 override fun showWelcomeScreen() {
 router.pushController(RouterTransaction.with(WelcomeController())
 .pushChangeHandler(SimpleSwapChangeHandler())
 .popChangeHandler(SimpleSwapChangeHandler()))
 }
 }
 
 interface LoginView : MvpView {
 fun showWelcomeScreen()
 }
 
 class LoginPresenter : MvpBasePresenter() {
 
 fun signInButtonClicked() {
 view?.showWelcomeScreen()
 }
 } 

github.com/johnkil/android-without-fragments 

Thank You 

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