Android Architecture Components

An overview about Android Architecture Components and how can you use in your project.

The sample code is available in: https://github.com/virgiliosolano/gdgdevfestbsb17/

GDGDevFestBSB'17

Transcript

1. ANDROID ARCHITECTURE COMPONENTS Virgílio Magalhães December, 2017
2. Where will you go? DO {} Show me the code WHAT ? What is Android Architecture Components ? HOW ? How is it organized ?
3. ▷ The beginning ▷ Architecture Review ▷ Components Concept WHAT ?
4. Lifecycles HOW ? LiveData ViewModel Room
5. Lifecycles class MyActivity extends AppCompatActivity { private MyLocationListener myLocationListener; public void onCreate(...) { myLocationListener = new MyLocationListener(this, getLifecycle(), location -> { // update UI }); ... LifecycleOwner LifecycleObserver
6. Lifecycles class MyLocationListener implements LifecycleObserver { private boolean enabled = false; public MyLocationListener(Context context, Lifecycle lifecycle, Callback callback){} @OnLifecycleEvent(Lifecycle.Event.ON_START) void start() {...} public void enable() { enabled = true; if (lifecycle.getCurrentState().isAtLeast(STARTED)) {...} } @OnLifecycleEvent(Lifecycle.Event.ON_STOP) void stop() {...} } LifecycleOwner LifecycleObserver
7. LiveData public class NameViewModel extends ViewModel { private MutableLiveData<String> mCurrentName; public MutableLiveData<String> getCurrentName() { if (mCurrentName == null) { mCurrentName = new MutableLiveData<String>(); } return mCurrentName; } ... MediatorLiveData MutableLiveData
8. LiveData public class NameActivity extends AppCompatActivity { private NameViewModel mModel; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mModel = ViewModelProviders.of(this).get(NameViewModel.class); final Observer<String> nameObserver = new Observer<String>() { @Override public void onChanged(@Nullable final String newName) { mNameTextView.setText(newName); } }; mModel.getCurrentName().observe(this, nameObserver); MutableLiveData Transformations
9. ViewModel public class MyViewModel extends ViewModel { private MutableLiveData<List<User>> users; public LiveData<List<User>> getUsers() { if (users == null) { users = new MutableLiveData<List<Users>>(); loadUsers(); } return users; } private void loadUsers() {...} }
10. ViewModel public class MyActivity extends AppCompatActivity { public void onCreate(Bundle savedInstanceState) { MyViewModel model = ViewModelProviders .of(this) .get(MyViewModel.class); model.getUsers().observe(this, users -> { // update UI }); } }
11. Room Entity Annotation @Entity public class User { @PrimaryKey private int uid; @ColumnInfo(name = "first_name") private String firstName; @ColumnInfo(name = "last_name") private String lastName; ... } @Dao public interface UserDao { @Query("SELECT * FROM user") List<User> getAll(); @Query("SELECT * FROM user WHERE uid IN (:userIds)") List<User> loadAllByIds(int[] userIds); @Insert void insertAll(User... users); @Delete void delete(User user); } DAO Interface
12. Room RoomDatabase @Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract UserDao userDao(); } AppDatabase db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, "database-name").build(); ViewModel
13. Architecture View
14. {...} Let’s coding
15. ▷ Adoption ▷ Tests ▷ Releases ▷ More Components ▷ Reactive Programming ▷ Dependency Injection Review
16. Android Architecture Components https://developer.android.com/topic/libraries/architecture/index.html Architecture Components - Introduction (Google I/O '17) https://www.youtube.com/watch?v=FrteWKKVyzI Android Architecture Blueprints https://github.com/googlesamples/android-architecture MVC x MVP x MVVM https://academy.realm.io/posts/eric-maxwell-mvc-mvp-and-mvvm-on-android/ References
17. Android Architecture Components - Danilo Prado https://www.youtube.com/watch?v=bTblJ617PV4 Começando com Architecture Components - Nelson Glauber https://www.youtube.com/watch?v=mnC1aN2yhqI Architecture Components (GDD Europe '17) - Florina https://www.youtube.com/watch?v=Ts-uxYiBEQ8 Architecture Components Distilled - Ubiratan Soares https://speakerdeck.com/ubiratansoares/architecture-components-distilled References
18. Virgílio Magalhães Information Systems by UNIPAM Studied at UFBA and UNICAMP Software Engineer Android Developer Meditation & Yoga DJ
19. THANK YOU @virgiliosolano virgiliosolmag@gmail.com https://linkedin.com/in/virgiliosolano/ :)