MVP Helpers

Source link:

> Helper classes to build Android Apps through MVP pattern in a faster way

This library exposes a minimal API, that should help you to build well architected Android Apps. ¡Check the following steps to get up and running!


Actually I don't have this library in JCenter/Maven Central, so if you want to use, follow the instructions. The library is distributed for Java and Kotlin. Looking for Kotlin variant? Go here


  • Add it in your root build.gradle at the end of repositories:
allprojects {
  repositories {

maven {

  url ""
  • Add the dependency:
dependencies {

compile 'com.github.BlackBoxVision:mvp-helpers:v0.2.0' 


  • Add this line to repositories section in pom.xml:
<repositories>  <repository>
 <url></url>  </repository> </repositories>
  • Add the dependency:
<artifactId>mvp-helpers</artifactId>  <version>v0.2.0</version> </dependency>


  • Add it in your build.sbt at the end of resolvers:
  resolvers += "jitpack" at ""
  • Add the dependency:
  libraryDependencies += "com.github.BlackBoxVision" % "mvp-helpers" % "v0.2.0" 

Core Concepts

The concepts behind this library are the following ones:

  • View → The View is an interface that contains methods related to UI interaction. Those methods should be implemented in your Activity, Fragment or View.

  • Interactor → The Interactor is the class that do the hard work, all the blocking operations like I/O, Networking, Database Intectations should be done here.

  • Presenter → The presenter acts as a middle man between the Interactor and the View.

Usage example

The usage is really simple:

1 - Create your View interface by extending the BaseView. BaseView is an empty interface that acts as water mark for the Presenter.

public interface DetailsView extends BaseView {

void onInfoReceived(@NonNull Bundle information);

void onInfoError(@NonNull String errorMessage);

2 - Create an Interactor class by extending the BaseInteractor class. The BaseInteractor provides you a set of helper methods to deal with background execution and UIThread interaction. The methods are the following ones:

  • runOnUiThread → use it when you need to post data to the main thread.
  • runOnBackground → use it when you need to make background processing.
  • runOnBackground → use it when you need to make a scheduled task.
  • cancelTask → use it when you want to cancel a scheduled task.
//This example uses Java 8 features, I assume the usage of retrolambda public final class DetailsInteractor extends BaseInteractor {

public void retrieveDetailsFromService(@NonNull final String id, @NonNull final OnSuccessListener<Bundle> successListener, @NonNull final OnErrorListener<String> errorListener) {

runOnBackground(() -> {

 //Getting data from somewhere

 final Bundle data = MockUtils.getMockedData(id);

  runOnUiThread(() -> {

  if (data != null) {


 else {

errorListener.onError("Ups, something went wrong");





3 - Create a Presenter class by extending the BasePresenter class. The BasePresenter provides you with a set of helper methods to deal with View management. The methods are the following ones:

  • isViewAttached → check if you have set the view to the presenter, returns to you a boolean value that you should handle in your presenter implementation.
  • attachView → add the view to the presenter, so you can start to handle the cycle of view - presenter - interactor interaction.
  • detachView → dereference the view, setting it to null. This method should be called in the onDestroy method in case of use in Activity, and onDestroyView in case of Fragment usage.
  • getView → simple getter, to make your access to the view defined more cleaner.
  • onViewAttached → callback fired when the view is attached to the presenter, it gives you the view so you can start doing something like restoring state, instantiating the interactors.
  • onViewDetached → callback fired when the view is detached from the presenter, in this place you can dereference the objects you won't use anymore.
//I use method references from Java 8 to point the callbacks to interactor, I assume a working project with Retrolambda public final class DetailsPresenter extends BasePresenter<DetailsView> {

  private DetailsInteractor interactor;

  protected void onViewAttached(@NonNull DetailsView view) {

interactor = new DetailsInteractor();


  protected void onViewDetached() {

interactor = null;

public void findRequiredInformation(@NonNull String id) {

if (isViewAttached()) {

 interactor.retrieveDetailsFromService(id, this::onSuccess, this::onError);



private void onSuccess(@NonNull Bundle information) {

if (isViewAttached()) {




private void onError(@NonNull String errorMessage) {

if (isViewAttached()) {




4 - Create a custom PresenterFactory class to provide the presenter instance. You should implement the PresenterFactory interface.

Now we have to create a Factory, because I have recently implemented a way to not loose presenter when configuration changes. The BaseActivity/BaseFragment use a Loader to provide the Presenter instance, Android Loaders can survive configuration changes, that's why I select them.

class DetailsPresenterFactory implements PresenterFactory<DetailsPresenter> {

 @Override  public DetailsPresenter create() {

return new DetailsPresenter();

5 - Attach this cycle with Android specific classes. You can choice an Activity/Fragment or also a custom view. In this case I will show you an example with Fragment that inherits from BaseFragment

The BaseFragment comes with a resumed lifecycle, and a set of methods to implement. The methods are the following ones:

  • createPresenterFactory → in this method you have to create an instance of PresenterFactory.
  • getLayout → in this method you have pass the id reference to the layout.
  • getPresenter → simple getter, to make your access to the presenter more cleaner.
  • onPresenterCreated → In this method you can start doing something with the presenter. ¡Now the View is attached automatically to the Presenter!
  • onPresenterDestroyed → In this method you can do something, like saving app state.
public final class DetailsFragment extends BaseFragment<DetailsPresenter, DetailsView> implements DetailsView {

  protected DetailsPresenterFactory createPresenterFactory() {

  return new DetailsPresenterFactory();


  protected int getLayout() {

  return R.layout.fragment_details;

  protected void onPresenterCreated(@NonNull DetailsPresenter presenter) {

//Do something when presenter it's created



  protected void onPresenterDestroyed() {

//Do something when presenter is removed, this method is called in onDestroy 

  void onInfoReceived(@NonNull Bundle information) {

  Toast.makeText(getContext(), information.toString(), Toast.LENGTH_SHORT).show();


  void onInfoError(@NonNull String errorMessage) {

  Toast.makeText(getContext(), errorMessage, Toast.LENGTH_SHORT).show();


Advise about ButterKnife

From version 0.2.0 of this library, I have decided to remove butterKnife, in order to not force any dev to use butterKnife.


If you found a bug, or you have an answer, or whatever. Please, open an issue. I will do the best to fix it, or help you.


Of course, if you see something that you want to upgrade from this library, or a bug that needs to be solved, PRs are welcome!

Release History

  • 0.2.0

    • CHANGE: BasePresenter has now two new callbacks, to be notified about view attachment/detachment.
    • CHANGE: BaseActivity/BaseFragment has now two new callbacks to be notified about presenter creation/destruction, also, addPresenter callback has been replace with createPresenterFactory
    • CHANGE: Added PresenterFactory interface to create custom factories to provide presenter instances
    • CHANGE: Added PresenterLoader, an Android Loader, that provides the presenter instance and survives configuration changes.
    • BUG FIX: Fixed issue with BaseInteractor runOnBackground method, this method was calling executor.isTerminated instead of calling executor.isShutdown, this produce a RuntimeException, because of troubles with ThreadPool reuse. Also, the methods have been refactored, to use a ExecutorService to get more control instead of an Executor.
  • 0.1.0

    • CHANGE: Folder refactor under UI package
    • CHANGE: Modified BasePresenter method registerView to attachView in order to get more consistence
    • CHANGE: Added new runOnBackground version in BaseInteractor that uses a ScheduledExecutorService and also cancel method to stop execution
    • CHANGE: Added Custom Views to extend BaseRelativeLayout, BaseFrameLayout and BaseLinearLayout
  • 0.0.3

    • CHANGE: Removed ButterKnife annotation processor
    • CHANGE: Rename mvphelper library to library
  • 0.0.2

    • CHANGE: Minor updates
  • 0.0.1

    • Work in progress


Distributed under the MIT license. See LICENSE for more information.


Simple Android Utility Methods.

Cross-platform mobile app development for iOS and Android. Build native UI's with full hardware access using Java.

Run a method once or repeat after some iterations. Super simple, One liners.

Like Button is a library that allows you to create a button with animation effects similar to Twitter's heart when you like something.

Send Button Custom View for chatting application. The custom view developed by drawing path over the coordinates of the figure. And the animation done by continuously changing the coordinates in one direction.

Base skeleton structure to start every new project, based on the design patters suggested by Robert C. Martin (aka Uncle Bob) on his clean architecture.


2D Engines   3D Engines   9-Patch   Action Bars   Activities   ADB   Advertisements   Analytics   Animations   ANR   AOP   API   APK   APT   Architecture   Audio   Autocomplete   Background Processing   Backward Compatibility   Badges   Bar Codes   Benchmarking   Bitmaps   Bluetooth   Blur Effects   Bread Crumbs   BRMS   Browser Extensions   Build Systems   Bundles   Buttons   Caching   Camera   Canvas   Cards   Carousels   Changelog   Checkboxes   Cloud Storages   Color Analysis   Color Pickers   Colors   Comet/Push   Compass Sensors   Conferences   Content Providers   Continuous Integration   Crash Reports   Credit Cards   Credits   CSV   Curl/Flip   Data Binding   Data Generators   Data Structures   Database   Database Browsers   Date &   Debugging   Decompilers   Deep Links   Dependency Injections   Design   Design Patterns   Dex   Dialogs   Distributed Computing   Distribution Platforms   Download Managers   Drawables   Emoji   Emulators   EPUB   Equalizers &   Event Buses   Exception Handling   Face Recognition   Feedback &   File System   File/Directory   Fingerprint   Floating Action   Fonts   Forms   Fragments   FRP   FSM   Functional Programming   Gamepads   Games   Geocaching   Gestures   GIF   Glow Pad   Gradle Plugins   Graphics   Grid Views   Highlighting   HTML   HTTP Mocking   Icons   IDE   IDE Plugins   Image Croppers   Image Loaders   Image Pickers   Image Processing   Image Views   Instrumentation   Intents   Job Schedulers   JSON   Keyboard   Kotlin   Layouts   Library Demos   List View   List Views   Localization   Location   Lock Patterns   Logcat   Logging   Mails   Maps   Markdown   Mathematics   Maven Plugins   MBaaS   Media   Menus   Messaging   MIME   Mobile Web   Native Image   Navigation   NDK   Networking   NFC   NoSQL   Number Pickers   OAuth   Object Mocking   OCR Engines   OpenGL   ORM   Other Pickers   Parallax List   Parcelables   Particle Systems   Password Inputs   PDF   Permissions   Physics Engines   Platforms   Plugin Frameworks   Preferences   Progress Indicators   ProGuard   Properties   Protocol Buffer   Pull To   Purchases   Push/Pull   QR Codes   Quick Return   Radio Buttons   Range Bars   Ratings   Recycler Views   Resources   REST   Ripple Effects   RSS   Screenshots   Scripting   Scroll Views   SDK   Search Inputs   Security   Sensors   Services   Showcase Views   Signatures   Sliding Panels   Snackbars   SOAP   Social Networks   Spannable   Spinners   Splash Screens   SSH   Static Analysis   Status Bars   Styling   SVG   System   Tags   Task Managers   TDD &   Template Engines   Testing   Testing Tools   Text Formatting   Text Views   Text Watchers   Text-to   Toasts   Toolkits For   Tools   Tooltips   Trainings   TV   Twitter   Updaters   USB   User Stories   Utils   Validation   Video   View Adapters   View Pagers   Views   Watch Face   Wearable Data   Wearables   Weather   Web Tools   Web Views   WebRTC   WebSockets   Wheel Widgets   Wi-Fi   Widgets   Windows   Wizards   XML   XMPP   YAML   ZIP Codes