dagger2記錄篇，dagger2記錄

dagger2記錄篇，dagger2記錄

作為一個碼農，什麼都不用多講，貼代碼

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; } } View Code

AppComponent

@Singleton @Component(modules = { AppModule.class }) public interface AppComponent { @ContextLife("Application") App getApplication(); RetrofitHelper retrofitHelper(); //提供http的幫助類 } View Code

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 @Singleton public RetrofitHelper provideRetrofitHelper() { return new RetrofitHelper(); } } View Code

ActivityComponent

@ActivityScope @Component(dependencies = AppComponent.class, modules = ActivityModule.class)//關聯上下 public interface ActivityComponent { Activity getActivity(); void inject(LoginActivity loginActivity);//要在類中使用注入功能 void inject(MainActivity mainActivity); } View Code

ActivityModule

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

Base裡面使用注入，否則無法注入

public abstract class PresenterActivity extends BaseActivity { private final static String TAG = "PresenterActivity"; protected abstract void initInject(); @Override protected 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); } } View Code

此時前提條件都有了

點擊運行自動生成注入代碼（沒問題的前提）

使用注入：

public class MainActivity extends PresenterActivity {

    @Inject
    protected IPresenterFactory mPresenter;//沒有創建對象，inject標簽注入類型

    private final int BASIC_PERMISSION_REQUEST_CODE = 100;
    private TextView username;

    @Override
    public void findView() {
        username = findView(R.id.username);
        username.setText(App.getInstance().getUserEntity().getName()+" hello");
    }

    @Override
    public void init() {
        if (mPresenter != null){
            Toasts.showShort("mPresenter success",context);//注入成功會打印出success
        }
    }

    @Override
    public int layoutResID() {
        return R.layout.activity_main;
    }

    @Override
    protected void initInject() {
        getActivityComponent().inject(this);
    }


    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onEvent() {
        Toasts.showShort("刷新UI",context);
    }

}