dagger2记录篇

作为一个码农，什么都不用多讲，贴代码

build project

build module

Application

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;}}

AppComponent

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

}

AppModule

@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();}}

ActivityComponent

@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);}

ActivityModule

@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);}}

Base里面使用注入，否则无法注入

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);}}

此时前提条件都有了

点击运行自动生成注入代码（没问题的前提）

使用注入：

public class MainActivity extends PresenterActivity {@Injectprotected IPresenterFactory mPresenter;//没有创建对象，inject标签注入类型private final int BASIC_PERMISSION_REQUEST_CODE = 100;private TextView username;@Overridepublic void findView() {username = findView(R.id.username);username.setText(App.getInstance().getUserEntity().getName()+" hello");}@Overridepublic void init() {if (mPresenter != null){Toasts.showShort("mPresenter success",context);//注入成功会打印出success}}@Overridepublic int layoutResID() {return R.layout.activity_main;}@Overrideprotected void initInject() {getActivityComponent().inject(this);}@Subscribe(threadMode = ThreadMode.MAIN)public void onEvent() {Toasts.showShort("刷新UI",context);}}

转载于:https://www.cnblogs.com/LiuZhen/p/5923387.html

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