dagger2記錄篇

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;
    }

}

AppComponent

@Singleton
@Component(modules = { AppModule.class })
public interface AppComponent {

    @ContextLife("Application")
    App getApplication();

    RetrofitHelper retrofitHelper();  //提供http的幫助類

}

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();
    }

}

ActivityComponent

@ActivityScope
@Component(dependencies = AppComponent.class, modules = ActivityModule.class)//關聯上下
public interface ActivityComponent {

    Activity getActivity();

    void inject(LoginActivity loginActivity);//要在類中使用註入功能
    void inject(MainActivity mainActivity);

}

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);
    }

}

Base裡面使用註入，否則無法註入

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);
    }

}

此時前提條件都有了

點擊運行自動生成註入代碼（沒問題的前提）

使用註入：

public class MainActivity extends PresenterActivity {

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

    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);//註入成功會列印出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);
    }

}