我是Dagger的新手,正在尝试弄清楚为什么没有注入特定的依赖项。尝试将Presenter插入片段时出现以下错误:
Caused by: java.lang.IllegalArgumentException: No inject registered for members/com.company.myapp.view.fragment.OverviewFragment. You must explicitly add it to the 'injects' option in one of your modules.
at dagger.ObjectGraph$DaggerObjectGraph.getInjectableTypeBinding(ObjectGraph.java:302)
at dagger.ObjectGraph$DaggerObjectGraph.inject(ObjectGraph.java:279)
at com.company.myapp.view.fragment.OverviewFragment.initializePresenter(OverviewFragment.java:50)
at com.company.myapp.view.fragment.BaseFragment.onViewCreated(BaseFragment.java:28)
at com.company.myapp.view.fragment.OverviewFragment.onViewCreated(OverviewFragment.java:84)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:871)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1040)
at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1142)
at android.app.Activity.onCreateView(Activity.java:4786)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
at android.app.Activity.setContentView(Activity.java:1929)
at com.company.myapp.view.activity.HomeActivity.onCreate(HomeActivity.java:23)
at android.app.Activity.performCreate(Activity.java:5231)
...
我有一个ApplicationModule,它引入了必要的应用程序级模块(例如分析)。
@Module(
injects = {
BaseApplication.class,
MyApplication.class,
TestMyApplication.class
},
includes = { DomainModule.class }
)
public class MyModule {
private final BaseApplication mApp;
public MyModule(BaseApplication app) {
mApp = app;
}
@Provides
@Singleton
public Context provideApplicationContext() {
return mApp;
}
}
我有一个OverviewModel直接与OverviewFragment相关。该模块的全部目的是将Presenter注入OverviewFragment。
@Module(
injects = OverviewFragment.class,
addsTo = ReviewsModule.class
)
public class OverviewModule {
private OverviewView mView;
public OverviewModule(OverviewView view) {
mView = view;
}
@Provides
@Singleton
public OverviewView provideView() {
return mView;
}
@Provides
@Singleton
public OverviewPresenter provideOverviewPresenter(OverviewView view) {
return new OverviewPresenter(view);
}
}
对象图是在BaseApplication对象的onCreate中创建的(带有Reviews模块)并被注入(
Modules.list()
返回模块列表,当前为空白的TestReviewsModule和ReviewsModule ...如上所示)。private void initializeObjectGraph() {
Timber.d("Initializing application object graph!");
og = ObjectGraph.create(Modules.list(this));
og.inject(this);
}
在OverviewFragment中,我检索此创建的对象图a(onViewCreated),然后执行以下操作以将我的OverviewModule添加到应用程序范围的对象图中:
public class OverviewFragment extends BaseFragment implements OverviewView {
protected ObjectGraph og;
@Inject OverviewPresenter mPresenter;
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
og = BaseApplication.getInstance().getAppObjectGraph();
initializePresenter();
}
@Override
void initializePresenter() {
og.plus(new OverviewModule(this));
og.inject(this);
mPresenter.initialize(mVendorId);
}
}
为什么我的应用程序说即使我明确声明要注入OverviewModule的OverviewFragment中,也没有注册?
最佳答案
Dagger / DI故障排除有点困难,所以我会尽可能的彻底...可能会帮助其他人。
阅读其他一些SO问题(例如Dagger can't find injectable members on a module)和一些文档后,我发现了问题。
我的基本问题是对.plus()
方法缺乏了解。我没有意识到它返回一个新的ObjectGraph而不是修改它被调用的图。通过执行.plus()
,然后在与我调用.plus()
的对象相同的ObjectGraph上进行注入,我实质上是在尝试从我的ReviewsModule中注入...,它不了解OverviewFragment,因此不知道该错误。
在OverviewFragment中,我需要从以下位置进行更改:
// old way
void initializePresenter() {
og.plus(new OverviewModule(this)); // Note this line
og.inject(this);
mPresenter.initialize(mVendorId);
}
至
// new way
void initializePresenter() {
og = og.plus(new OverviewModule(this)); // Note this line
og.inject(this);
mPresenter.initialize(mVendorId);
}
这将返回带有OverviewModule和ReviewsModule的新图。