I am following coding with mitch's dagger 2 course from youtube.I am confused about something.Here is my classes: AppComponent.class
@Singleton
@Component(
modules = {
AndroidSupportInjectionModule.class,
ActivityBuildersModule.class,
AppModule.class,
ViewModelFactoryModule.class,
}
)
public interface AppComponent extends AndroidInjector<BaseApplication> {
SessionManager sessionManager();
@Component.Builder
interface Builder{
@BindsInstance
Builder application(Application application);
AppComponent build();
}
}
ActivityBuildersModule
@Module
public abstract class ActivityBuildersModule {
@ContributesAndroidInjector(
modules = {AuthViewModelsModule.class,
AuthModule.class
}
)
abstract AuthActivity contributeAuthActivity();
@ContributesAndroidInjector
abstract MainActivity contributeMainActivity();
}
BaseActivity
public abstract class BaseActivity extends DaggerAppCompatActivity {
private static final String TAG = "BaseActivity";
@Inject
public SessionManager sessionManager;//confused here
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
subscribeObservers();
}
private void subscribeObservers() {
sessionManager.getAuthUser().observe(this, userAuthResource -> {
if (userAuthResource != null) {
switch (userAuthResource.status) {
case LOADING: {
break;
}
case AUTHENTICATED: {
Log.d(TAG, "subsrcibeObservers: LOGIN SUCCESS:" + userAuthResource.data.getEmail());
break;
}
case ERROR: {
Toast.makeText(this, userAuthResource.message, Toast.LENGTH_SHORT).show();
break;
}
case NOT_AUTHENTICATED: {
navLoginScreen();
break;
}
}
}
});
}
private void navLoginScreen(){
Intent intent = new Intent(this, AuthActivity.class);
startActivity(intent);
finish();
}
}
MainActivity
public class MainActivity extends BaseActivity {
private static final String TAG = "MainActivity";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
SessionManager
@Singleton
public class SessionManager {
private static final String TAG = "SessionManager";
private MediatorLiveData<AuthResource<User>> cachedUser = new MediatorLiveData<>();
@Inject
public SessionManager() {
}
public void authenticaWithId(final LiveData<AuthResource<User>> source) {
if (cachedUser != null) {
cachedUser.setValue(AuthResource.loading(null));
cachedUser.addSource(source, userAuthResource -> {
cachedUser.setValue(userAuthResource);
cachedUser.removeSource(source);
});
}
}
public void logOut(){
Log.d(TAG, "logOut: logging out...");
cachedUser.setValue(AuthResource.logout());
}
public LiveData<AuthResource<User>> getAuthUser(){
return cachedUser;
}
}
BaseApplication
public class BaseApplication extends DaggerApplication {
@Override
protected AndroidInjector<? extends DaggerApplication> applicationInjector() {
return DaggerAppComponent.builder().application(this).build();
}
}
My problem is @Inject SessionManager sessionManager that statement in the BaseActivity.In the ActivityBuildersModule class, we only annotated MainActivity as a subcomponent, not the BaseActivity.Since the MainActivity is a subcomponent it can access dependencies of the AppComponent.So how we get accessed that SessionManager in the Base Activity or we get accessed that object because MainActivity is derived from BaseActivity?
