Advanced Dagger for Android Android Testing Bootcamp #2 yuyakaido 

ࣗݾ঺հ • ւ౻༏໻ʢ͔͍Ͳ͏Ώ͏΍ʣ • גࣜձࣾΤ΢ϨΧ • ໿1೥ͷΠϯλʔϯΛܦͯɺ2015೥4݄ʹ৽ଔೖࣾ • ςετ͓͡͞Μ  yuyakaido yuyakaido 

גࣜձࣾΤ΢ϨΧ • ࣗࣾαʔϏεͷاըɾ։ൃɾӡӦ • ΦϯϥΠϯσʔςΟϯάαʔϏεɿ • Χοϓϧઐ༻ΞϓϦɿ • ࣾһ਺ɿ104໊ • IAC  ΤϯδχΞ 51ਓ ඇΤϯδχΞ 53ਓ 

໨࣍ • DIͱ͸ • جૅฤ • Ԡ༻ฤ • ·ͱΊ  

DIͱ͸ • DI = Dependency Injection • ೔ຊޠͰ͸ɺґଘੑ஫ೖ • ґଘੑͱ͸  

ґଘੑ • Կ͸ͱ΋͋ΕɺίʔυΛݟͯΈΔ • GithubRepositoryΫϥε͸2ͭͷΫϥεʹґଘ • ΫϥεA͕ΫϥεBʹґଘ͍ͯ͠Δ͜ͱ͕ґଘੑ  public class GithubRepository {
 private GithubClient githubClient = new GithubClient();
 private GithubDao githubDao = new GithubDao();
 } 

ґଘੑ • ґଘੑ͕ϕλॻ͖ͩͱԿ͕Ϛζ͍ͷ͔ • Ϣχοτςετ͕ࠔ೉ • ґଘઌͷΫϥε͕ਖ਼ৗʹಈ͍͍ͯΔඞཁੑ • Կͱ͔ͯ͠ґଘੑΛഉআ͍ͨ͠ • ͱΓ͋͑ͣηολʔΛఆٛ͢Ε͹͍͍ͷͰ͸ʁ  

ґଘੑ • ଟগґଘ౓͸Լ͕͕ͬͨɺࠜຊղܾʹͳͬͯͳ͍ • Ϣχοτςετ͕ࠔ೉ • ґଘઌͷΫϥε͕ਖ਼ৗʹಈ͍͍ͯΔඞཁੑ  public class GithubRepository {
 private GithubClient githubClient;
 private GithubDao githubDao;
 
 public void setGithubClient(GithubClient githubClient) {
 this.githubClient = githubClient;
 }
 
 public void setGithubDao(GithubDao githubDao) {
 this.githubDao = githubDao;
 }
 } 

public class GithubRepository {
 private GithubClient githubClient;
 private GithubDao githubDao;
 
 public GithubRepository(GithubClient client, GithubDao dao) {
 this.githubClient = client;
 this.githubDao = dao;
 }
 } public interface GithubClient { /* লུ */ } public interface GithubDao { /* লུ */ } ґଘੑ  • Ϣχοτςετ͕ࠔ೉ • GithubClientɺGithubDaoΛϞοΫ͢Ε͹ GithubRepositoryͷϢχοτςετ͕Մೳ • ґଘΫϥε͕ਖ਼ৗʹಈ࡞͍ͯ͠Δඞཁੑ • ͱΓ͋͑ͣϞοΫͯ͠͠·͑͹ಈ͘ 

DIͱ͸ • DI = Dependency Injection • ೔ຊޠͰ͸ɺґଘੑ஫ೖ • DI = ґଘΛϕλॻ͖Λආ͚ΔͨΊͷ࢓૊Έ  

Dagger • ಥવͰ͕͢ɺDagger͸2ͭ͋Γ·͢ • https://github.com/square/dagger • ΦϦδφϧ͸ͬͪ͜ • https://github.com/google/dagger • square/daggerΛϕʔεʹͯ͠Google͕ख ΛೖΕͨ΋ͷ  

جૅฤ • Inject • Module • Component • جຊతͳ࢖͍ํ  

Inject • @InjectΛॻ͘ͱΠϯελϯε͕஫ೖ͞ΕΔ  public class GithubRepository {
 private GithubClient githubClient;
 private GithubDao githubDao;
 
 
 public GithubRepository(GithubClient client, GithubDao dao) {
 this.githubClient = client;
 this.githubDao = dao;
 }
 } 

Inject • @InjectΛॻ͘ͱΠϯελϯε͕஫ೖ͞ΕΔ  public class GithubRepository {
 private GithubClient githubClient;
 private GithubDao githubDao;
 
 @Inject
 public GithubRepository(GithubClient client, GithubDao dao) {
 this.githubClient = client;
 this.githubDao = dao;
 }
 } 

Module • ੜ੒͢ΔΠϯελϯεΛఆٛ͢ΔΫϥε  @Module
 public class GithubModule {
 
 @Provides
 public GithubClient provideGithubClient() {
 return new GithubClientImpl();
 }
 
 @Provides
 public GithubDao provideGithubDao() {
 return new GithubDaoImpl();
 } 
 } 

Component • ModuleͱInjectର৅Ϋϥεͷؔ܎Λఆٛ  @Component(modules = {GithubModule.class})
 public interface AppComponent {
 void inject(MainActivity mainActivity);
 } 

جຊతͳ࢖͍ํ • DaggerAppComponentΛॳظԽ  public class Genesis extends Application {
 
 private AppComponent appComponent;
 
 public static AppComponent getAppComponent(Context context) {
 Genesis genesis = (Genesis) context.getApplicationContext();
 return genesis.appComponent;
 }
 
 @Override
 public void onCreate() {
 super.onCreate();
 appComponent = DaggerAppComponent.builder().build();
 }
 
 } 

جຊతͳ࢖͍ํ • Inject͢Δ  public class MainActivity extends Activity {
 
 @Inject
 GithubRepository githubRepository;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Genesis.getAppComponent(this).inject(this);
 }
 
 } 

Ԡ༻ฤ • Dependencies • Subcomponent  

લఏ • ΞϓϦͷن໛ʹൺྫͯ͠ɺModule΋૿͑Δ • Module͕૿͑ΔͱComponent͕ڊେԽ͍ͯ͘͠  

Dependencies Subcomponent ͱ͸ • ΞϓϦͷن໛ʹൺྫͯ͠ɺModule΋૿͑Δ • Moduleͷ؅ཧํ๏ • Dependencies • Subcomponent  

Dependencies • ґଘ͍ͯ͠ΔModuleΛྻڍ  @Component(dependencies = {GithubModule.class})
 public interface AppComponent {
 void inject(MainActivity mainActivity);
 } 

Dependencies • ґଘ͍ͯ͠ΔModuleΛྻڍ  @Component(dependencies = {GithubModule.class})
 public interface AppComponent {
 void inject(MainActivity mainActivity);
 } 

Subcomponent • ComponentΛ֊૚Խ͢Δ  @ScreenScope
 @Subcomponent(modules = {InstagramModule.class})
 public interface InstagramComponent {
 void inject(InstagramActivity instagramActivity);
 } 

Subcomponent • ComponentΛ֊૚Խ͢Δ  @ScreenScope
 @Subcomponent(modules = {InstagramModule.class})
 public interface InstagramComponent {
 void inject(InstagramActivity instagramActivity);
 } 

Dependencies Subcomponent • Dependencies • ґଘ͍ͯ͠ΔModuleΛྻڍ • Subcomponent • ComponentΛ֊૚Խ  

Dependencies Subcomponent ͷҧ͍ • Dependencies • શͯͷModule͕1ͭͷComponentʹॴଐ • Subcomponent • Componentࣗମ͕֊૚Խ͞ΕɺͦΕͧΕ ͷComponent͕ModuleΛ؅ཧ  ͳΔ΄Ͳɺ෼͔ΒΜ 

Dependencies  AppComponent FooModule BarModule 

Subcomponent  AppComponent FooComponent BarComponent 

Dependencies Subcomponent • ͲͪΒΛ࢖͏΂͖͔ • ن໛͕খ͚͞Ε͹ɺDependencies • ͋Δఔ౓ͷن໛Λ૝ఆ͢ΔͳΒɺSubcomponent • Dependenciesͩͱ1ͭͷComponent͕શͯͷґ ଘΠϯελϯεΛ؅ཧ͢Δ͜ͱʹɺɺ  

·ͱΊ • DIͱ͸Կͳͷ͔ • ґଘੑΛϕλॻ͖͠ͳ͍ͨΊͷ࢓૊Έ • Daggerجૅฤ • ModuleͱComponent • DaggerԠ༻ฤ • DependenciesͱSubcomponent  

ࢀߟ • ཁ͢Δʹ DI ͬͯԿͳͷͱ͍͏࿩ • http://nekogata.hatenablog.com/entry/ 2014/02/13/073043 • Android: Dagger2 - Subcomponent vs. dependencies • http://yuki312.blogspot.jp/2016/02/android-dagger2- subcomponent-vs.html  

Thank you :) Credit: NASA Earth Observatory/NOAA NGDC