匕首2：在不同库模块上具有相同作用域的多个组件之间提供相同实例

从您的位置删除注射位点

CoreComponent

CoreRepository

@Singleton@Component(modules = {CoreModule.class})public interface CoreComponent {    CoreRepository coreRepository();}

在应用程序内部创建对此单例作用域组件的引用：

public class MyApplication extends Application {    private final CoreComponent coreComponent;    @Override    public void onCreate() {        super.onCreate();        coreComponent = DaggerCoreComponent      .coreModule(new CoreModule())      .build();    }    public static CoreComponent getCoreComponent(Context context) {        return ((MyApplication) context.getApplicationContext()).coreComponent;    }}

创建一个新的缩小范围：

@Scope@Retention(RetentionPolicy.RUNTIME) public @interface PerActivity {}

创建一个新组件，以跟踪此范围以及所需的注射部位：

@PerActivity@Component(dependencies = {CoreComponent.class})public interface ActivityComponent {    void inject(FooActivity activity);    void inject(BarActivity activity);}

当您在注入站点中访问此活动范围的组件时，需要将其实例提供

CoreComponent

Activity

public class FooActivity extends AppCompatActivity {        @Inject        public CoreRepository repo;        @Override        protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); CoreComponent coreComponent = MyApplication.getCoreComponent(this); DaggerActivityComponent.builder()     .coreComponent(coreComponent)     .build()     .inject(this);        }    }}