easymvp

Interface Presenter<V>

Type Parameters:

V - Generic type of view that the presenter interacts with. To make presenter testable, the view should be implemented with an interface and presenter refers to it instead of the view implementation. This will allow to write unit tests without any android SDK dependency.

All Known Implementing Classes:

AbstractPresenter

public interface Presenter<V>

Base interface for all presenters in Model-View-Presenter pattern.

The Presenter is responsible for orchestrating all the application's use cases, So it acts as a middle man that retrieves model from data-layer and shows it in the view.

In MVP pattern, view is made completely passive and is no longer responsible for updating itself from the model. So it routes all user actions to the presenter and the presenter decides the action to take.

Method Summary

Modifier and Type	Method and Description
V	getView()
boolean	isViewAttached()
void	onDestroyed() Called when a user leaves the view completely.
void	onViewAttached(V view) Called when the view attached to the screen.
void	onViewDetached() Called when the view detached from the screen.

Method Detail

onViewAttached

void onViewAttached(V view)

Called when the view attached to the screen.

This method will be invoked during Activity.onStart(), Fragment.onResume() and View.onAttachedToWindow().

Parameters:

view - the view that the presenter interacts with

onViewDetached

void onViewDetached()

Called when the view detached from the screen.

This method will be invoked during Activity.onStop(), Fragment.onPause() and View.onDetachedFromWindow().

onDestroyed

void onDestroyed()

Called when a user leaves the view completely. After the invocation of this method, presenter instance will be destroyed.

Note that on configuration changes like rotation, presenter instance will be alive.

isViewAttached

boolean isViewAttached()

Returns:

Returns true if the view is currently attached to the presenter, otherwise returns false.

getView

@Nullable
V getView()

Returns:

Returns the attached view. If view is already detached, null will be returned.