AAC-2017-soma

Android Architecture Components ੿അ૑ औѱ ੉೧ೞӝ [email protected] GDG Korea Android
Oganaizer DAYCORE Android Developer

Guide to App Architecture For Android Developer

Android Architecture Component?

Point 0. t5IFNPTUJNQPSUBOUUIJOHZPVTIPVMEGPDVTPOJT UIFTFQBSBUJPOPGDPODFSOT  JOZPVSBQQu

Point 1. t5IFTFDPOEJNQPSUBOUQSJODJQMFJTUIBUZPVTIPVME ESJWFZPVS6*GSPNBNPEFM   QSFGFSBCMZBQFSTJTUFOUNPEFMu

Android Architecture Components LifeCycle ViewModel LiveData Room

Lifecycle

onCreate onStart onResum e onPause onStop onDestory Util.checkUserStatus() myLocationListener.stop() myLocationListener.start()

LifeCycle - android.arch.lifecycle "DUJWJUZژח'SBHNFOU੄ അ੤ۄ੉೐ࢎ੉௿ীٮۄҙ۲ҳࢿਃࣗী ؀ೠࢤݺ઱ӝ࢚కܳ୶੸ೞח௿ېझ߂ ੋఠಕ੉झܳઁҕ೤פ׮

LifeCycleOwner -JGF$ZDMFё୓ܳ߈ജೞחױੌੋఠಕ੉झ

LifeCycleObserver ݫࢲ٘ী઱ࢳਸ୶оೣਵ۽ॄҳࢿਃࣗ੄ ࢤݺ઱ӝܳݽפఠ݂ೡࣻ੓חੋఠಕ੉झ

public class MyObserver implements LifecycleObserver { @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) public void onResume()
{ } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) public void onPause() { } } aLifecycleOwner.getLifecycle().addObserver(new MyObserver());

class MyLocationListener implements LifecycleObserver { private boolean enabled = false;
public MyLocationListener(Context context, Lifecycle lifecycle, Callback callback) { ... } @OnLifecycleEvent(Lifecycle.Event.ON_START) void start() { if (enabled) { // connect } } public void enable() { enabled = true; if (lifecycle.getState().isAtLeast(STARTED)) { // connect if not connected } } @OnLifecycleEvent(Lifecycle.Event.ON_STOP) void stop() { // disconnect if connected } }

ViewModel

ViewModel Scope

onCreate onStart onResum e onStop onDestory Web service.fetchUser() onPause Activity
Rotated Web service.fetchUser() onCreate onStart onResum e

onCreate onStart onResum e onStop onDestory Web service.fetchUser() onPause Activity
Rotated onCreate onStart onResum e

࠺ૉפझ۽૒߂ాन୊ܻ ؘ੉ఠҙܻ $POGJHVSBUJPO߸҃ী؀਽ೞח ؘ੉ఠ੷੢ "DUJWJUZ'SBHNFOU۽ࠗఠة݀ Using ViewModel

public class SharedViewModel extends ViewModel { private final MutableLiveData<Item> selected
= new MutableLiveData<Item>(); public void select(Item item) { selected.setValue(item); } public LiveData<Item> getSelected() { return selected; } } public class MasterFragment extends Fragment { private SharedViewModel model; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); model = ViewModelProviders.of(getActivity()).get(SharedViewModel.class); itemSelector.setOnClickListener(item -> { model.select(item); }); } }

LiveData

LiveData<T> -JGFDZDMFBXBSF "OPCTFSWBCMF "QQ$PNQPOFOUPCTFSWFST

೦࢚୭न੄ؘ੉ఠ۽ਬ૑оמ ݫݽܻ־ࣻহ਺ -JGFDZDMF੉উ੹ೡٸ݅੹׳ೠ׮ ઺૑ػ"DUJWJUZী੄ೠ୽ج੉হ਺ 6*оؘ੉ఠ࢚క৬ੌ஖ೞח૑୓௼ܳਤ ೠ߹ب੄ҳഅ9 Using LiveData

public class NameActivity extends AppCompatActivity { private NameViewModel mModel; @Override
protected void onCreate(Bundle savedInstanceState) { //... // ViewModelਸ оઉ২פ׮. mModel = ViewModelProviders.of(this).get(NameViewModel.class); // UIܳ সؘ੉౟ೞח ২੷ߡܳ ٟ݅פ׮. final Observer<String> nameObserver = new Observer<String>() { @Override public void onChanged(@Nullable final String newName) { // UIо সؘ੉౟ ػ ҃਋݅ mNameTextView.setText(newName); } }; // ???!! mModel.getCurrentName().observe(this, nameObserver); } }

.observe(LifecycleOwner owner, Observer<T> observer) LifecycleOwner Observer LiveData mModel.getCurrentName().observe(this, nameObserver);

Room (ORM of SQLite)

ਗद SQL ௪ܻ੄ ஹ౵ੌ ఋ੐ Ѩૐ  SQL ௪ܻ৬ Java ؘ੉ఠ
ё୓ ࢎ੉ܳ ߸ജೞח boilerplate codeܳ ઁѢ ழࢲ ژח ۽؊ ੘ࢿ ೙ਃ হ਺(߈ജ ૑ਗೣ)  ؘ੉ఠ ৔ࣘച ઁҕ Using Room

@Database(entities = {User.class}, version = 1) public abstract class AppDatabase
extends RoomDatabase { public abstract UserDao userDao(); } Table Deﬁnition Database

@Entity public class User { @PrimaryKey private int uid; @ColumnInfo(name
= "first_name") private String firstName; @ColumnInfo(name = "last_name") private String lastName; // Getters and setters are ignored for brevity, // but they're required for Room to work. } Deﬁnition Entity

@Dao public interface UserDao { @Query("SELECT * FROM user") List<User>
getAll(); @Query("SELECT * FROM user WHERE uid IN (:userIds)") List<User> loadAllByIds(int[] userIds); @Query("SELECT * FROM user WHERE first_name LIKE :first AND " + "last_name LIKE :last LIMIT 1") User findByName(String first, String last); @Insert void insertAll(User... users); @Delete void delete(User user); } Deﬁnition DAO

ۄ੉೐ࢎ੉௿җੜোزغח"OESPJEজࢸ҅ ীب਑غח૑ஜ জѐߊ੗о૒ݶೞחੌ߈੸ੋޙઁܳ೧Ѿೞ Ҋজਸѐߊೞחѐߊ੗ٜীѱউ੿੸ੋজਸ ҳ୷ೞӝਤ೧ҳӖীࢲઁҕೠҕधо੉٘৓ ׮ ੿ܻ

хࢎ೤פ׮!

AAC-2017-soma

AAC-2017-soma

Hyeonji Jeong

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Transcript

Android Architecture Components ੿അ૑ औѱ ੉೧ೞӝ [email protected] GDG Korea Android

Guide to App Architecture For Android Developer

Android Architecture Component?

Point 0. t5IFNPTUJNQPSUBOUUIJOHZPVTIPVMEGPDVTPOJT UIFTFQBSBUJPOPGDPODFSOT  JOZPVSBQQu

Point 1. t5IFTFDPOEJNQPSUBOUQSJODJQMFJTUIBUZPVTIPVME ESJWFZPVS6*GSPNBNPEFM   QSFGFSBCMZBQFSTJTUFOUNPEFMu

Android Architecture Components LifeCycle ViewModel LiveData Room

Lifecycle

onCreate onStart onResum e onPause onStop onDestory Util.checkUserStatus() myLocationListener.stop() myLocationListener.start()

LifeCycle - android.arch.lifecycle "DUJWJUZژח'SBHNFOU੄ അ੤ۄ੉೐ࢎ੉௿ীٮۄҙ۲ҳࢿਃࣗী ؀ೠࢤݺ઱ӝ࢚కܳ୶੸ೞח௿ېझ߂ ੋఠಕ੉झܳઁҕ೤פ׮

LifeCycleOwner -JGF$ZDMFё୓ܳ߈ജೞחױੌੋఠಕ੉झ

LifeCycleObserver ݫࢲ٘ী઱ࢳਸ୶оೣਵ۽ॄҳࢿਃࣗ੄ ࢤݺ઱ӝܳݽפఠ݂ೡࣻ੓חੋఠಕ੉झ

public class MyObserver implements LifecycleObserver { @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) public void onResume()

class MyLocationListener implements LifecycleObserver { private boolean enabled = false;

ViewModel

ViewModel Scope

onCreate onStart onResum e onStop onDestory Web service.fetchUser() onPause Activity

onCreate onStart onResum e onStop onDestory Web service.fetchUser() onPause Activity

࠺ૉפझ۽૒߂ాन୊ܻ ؘ੉ఠҙܻ $POGJHVSBUJPO߸҃ী؀਽ೞח ؘ੉ఠ੷੢ "DUJWJUZ'SBHNFOU۽ࠗఠة݀ Using ViewModel

public class SharedViewModel extends ViewModel { private final MutableLiveData<Item> selected

LiveData

LiveData<T> -JGFDZDMFBXBSF "OPCTFSWBCMF "QQ$PNQPOFOUPCTFSWFST

೦࢚୭न੄ؘ੉ఠ۽ਬ૑оמ ݫݽܻ־ࣻহ਺ -JGFDZDMF੉উ੹ೡٸ݅੹׳ೠ׮ ઺૑ػ"DUJWJUZী੄ೠ୽ج੉হ਺ 6*оؘ੉ఠ࢚క৬ੌ஖ೞח૑୓௼ܳਤ ೠ߹ب੄ҳഅ9 Using LiveData

public class NameActivity extends AppCompatActivity { private NameViewModel mModel; @Override

.observe(LifecycleOwner owner, Observer<T> observer) LifecycleOwner Observer LiveData mModel.getCurrentName().observe(this, nameObserver);

Room

Room (ORM of SQLite)

ਗद SQL ௪ܻ੄ ஹ౵ੌ ఋ੐ Ѩૐ  SQL ௪ܻ৬ Java ؘ੉ఠ

@Database(entities = {User.class}, version = 1) public abstract class AppDatabase

@Entity public class User { @PrimaryKey private int uid; @ColumnInfo(name

@Dao public interface UserDao { @Query("SELECT * FROM user") List<User>

੿ܻ

ۄ੉೐ࢎ੉௿җੜোزغח"OESPJEজࢸ҅ ীب਑غח૑ஜ জѐߊ੗о૒ݶೞחੌ߈੸ੋޙઁܳ೧Ѿೞ Ҋজਸѐߊೞחѐߊ੗ٜীѱউ੿੸ੋজਸ ҳ୷ೞӝਤ೧ҳӖীࢲઁҕೠҕधо੉٘৓ ׮ ੿ܻ

хࢎ೤פ׮!