The android past · present · future#

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12. Model View Presenter View Presenter Model User interaction notify user

    event request data Update UI with entities delivers entities

13. Kata

14. MVP Example

15. public interface ArtistsMvpView extends MvpView{ void showLoading(); void hideLoading(); void

    showArtistNotFoundMessage(); void showConnectionErrorMessage(); void renderArtists(List<Artist> artists); void launchArtistDetail(Artist artist); } View

16. public class ArtistsPresenter implements Presenter<ArtistsMvpView>, ArtistCallback { private ArtistsMvpView artistsMvpView;

    private ArtistsInteractor artistsInteractor; public ArtistsPresenter() { } @Override public void setView(ArtistsMvpView view) { if (view == null) throw new IllegalArgumentException("You can't set a null view"); artistsMvpView = view; artistsInteractor = new ArtistsInteractor(artistsMvpView.getContext()); } @Override public void detachView() { artistsMvpView = null; } public void onSearchArtist(String string) { artistsMvpView.showLoading(); artistsInteractor.loadDataFromApi(string, this); } public void launchArtistDetail(Artist artist) { artistsMvpView.launchArtistDetail(artist); } //more methods } Presenter

17. Interactor public class ArtistsInteractor { public void loadDataFromApi(String query, ArtistCallback

    artistCallback) { mSpotifyService.searchArtist(query) .subscribeOn(mSpotifyApp.SubscribeScheduler()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(ArtistsSearch -> onSuccess(ArtistsSearch, artistCallback), throwable -> onError(throwable, artistCallback)); } // more methods }

18. User interaction public void onSearchArtist(String string) { artistsMvpView.showLoading(); artistsInteractor.loadDataFromApi(string, this);

    } View Presenter public void loadDataFromApi(String query, ArtistCallback artistCallback) { mSpotifyService.searchArtist(query) .subscribeOn(mSpotifyApp.SubscribeScheduler()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(ArtistsSearch -> onSuccess(ArtistsSearch, artistCallback), throwable -> onError(throwable, artistCallback)); } Interactor @Override public boolean onQueryTextSubmit(String query) { artistsPresenter.onSearchArtist(query); return true; } Notify user event Request data Search an Artist

19. private void onSuccess(ArtistsSearch artistsSearch, ArtistCallback artistCallback) { if (artistsSearch.getArtists() !=

    null) { if (artistsSearch.getArtists().size() > 0) { artistCallback.onResponse(artistsSearch.getArtists()); } else { artistCallback.onArtistNotFound(); } } Delivers entities Interactor @Override public void onResponse(List<Artist> artists) { artistsMvpView.hideLoading(); artistsMvpView.renderArtists(artists); } Presenter View Update UI with entities @Override public void renderArtists(List<Artist> artists) { ArtistsAdapter adapter = (ArtistsAdapter) rv_artist.getAdapter(); adapter.setArtists(artists); adapter.notifyDataSetChanged(); }
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23. Model View ViewModel View ViewModel Model DataBinding and Commands ViewModel

    updates the model Send Notifications Send Notifications
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26. dataBinding { enabled = true }

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30. Kata

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33. • These patterns try to solve the same problems •

    Both patterns are going to improve code quality and testability. • Think about these patterns and use the one you understand better.
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35. • Effective Android UI https://www.youtube. com/watch?v=N6yqe88ysNw • Data Binding --

    Write Apps Faster https://www. youtube.com/watch?v=NBbeQMOcnZ0 • MVVM_Hacker_News https://github.com/hitherejoe/MVVM_Hacker_News • My Personal Blog https://erikcaffrey.github.io

36. Erik Jhordan González Reyes Android Developer +Erik Jhordan Rey Caffrey

    @ErikJhordan_Rey erikcaffrey erikcaffrey.github.io
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