public class App extends Application {private AppComponent appComponent;@Override public void onCreate() {super.onCreate();appComponent= DaggerAppComponent.builder().appModule(new AppModule(this)).build();}public AppComponent getAppComponent() {return appComponent;}}

@Singleton
@Component(modules = { AppModule.class })
public interface AppComponent {@ContextLife("Application")App getApplication();RetrofitHelper retrofitHelper();  //提供http的帮助类

}

@Module
public class AppModule {private App application;public AppModule(App application){this.application=application;}@Provides@Singleton@ContextLife("Application")public App provideApplication(){return application;}@Provides@Singletonpublic RetrofitHelper provideRetrofitHelper() {return new RetrofitHelper();}}

@ActivityScope
@Component(dependencies = AppComponent.class, modules = ActivityModule.class)//关联上下
public interface ActivityComponent {Activity getActivity();void inject(LoginActivity loginActivity);//要在类中使用注入功能void inject(MainActivity mainActivity);}

@Module
public class ActivityModule {private Activity mActivity;public ActivityModule(Activity activity) {this.mActivity = activity;}@Provides@ActivityScopepublic Activity provideActivity() {return mActivity;}@Provides@ActivityScopepublic IPresenterFactory providePresenter(RetrofitHelper retrofitHelper) {return new PresenterFactory(retrofitHelper);}}

public abstract class PresenterActivity extends BaseActivity {private final static String TAG = "PresenterActivity";protected abstract void initInject();@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);initInject();}protected ActivityComponent getActivityComponent(){return  DaggerActivityComponent.builder().appComponent(App.getInstance().getAppComponent()).activityModule(getActivityModule()).build();}private ActivityModule getActivityModule() {return new ActivityModule(this);}}