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This is an example of Android development with VIPER in Kotlin
interface LoginContracts {
interface View {
fun showError(message: String)
}
interface Presenter {
fun onDestroy()
fun onLoginButtonPressed(username: String, password: String)
}
interface Interactor {
fun unregister()
fun login(username: String, password: String)
}
interface InteractorOutput {
fun onLoginSuccess(user: User)
fun onLoginError(message: String)
}
interface Router {
fun unregister()
fun presentHomeScreen(user: User)
}
}
class LoginActivity: BaseActivity, LoginContracts.View {
var presenter: LoginContracts.Presenter? = null
//other fields
override fun onCreate() {
//...
presenter = LoginPresenter(this)
loginButton.setOnClickListener { onLoginButtonClicked() }
//...
}
override fun onDestroy() {
presenter?.onDestroy()
presenter = null
super.onDestroy()
}
private fun onLoginButtonClicked() {
presenter?.onLoginButtonClicked(usernameEditText.text, passwordEditText.text)
}
fun showError(message: String) {
//shows the error on a dialog
}
}
class LoginPresenter(var view: LoginContracts.View?): LoginContracts.Presenter, LoginContracts.InteractorOutput {
var interactor: LoginContracts.Interactor? = LoginInteractor(this)
var router: LoginContracts.Router? = LoginRouter(view as? Activity)
fun onDestroy() {
view = null
interactor?.unregister()
interactor = null
router?.unregister()
router = null
}
fun onLoginButtonPressed(username: String, password: String) {
interactor?.login(username, password)
}
fun onLoginSuccess(user: User) {
router?.goToNextScreen(user)
}
fun onLoginError(message: String) {
view?.showError(message)
}
}
class LoginInteractor(var output: LoginContracts.InteractorOutput?): LoginContracts.Interactor {
fun unregister() {
output = null
}
fun login(username: String, password: String) {
LoginApiManager.login(username, password)
?.subscribeOn(Schedulers.io())
?.observeOn(AndroidSchedulers.mainThread())
?.subscribe({
//does something with the user, like saving it or the token
output?.onLoginSuccess(it)
},
{ output?.onLoginError(it.message ?: "Error!") })
}
}
class LoginRouter(var activity: Activity?): LoginContracts.Router {
fun unregister() {
activity = null
}
fun presentHomeScreen(user: User) {
val intent = Intent(view, HomeActivity::class.java)
intent.putExtra(Constants.IntentExtras.USER, user)
activity?.startActivity(intent)
}
}
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