我正在尝试将我正在构建的项目转换为使用dagger-android API用于DI框架,但是当尝试使用@ContributesAnroidInjector注入片段时,我遇到了IllegalArgumentException的死胡同。
相关模块和组件包含在下面:
ApplicationComponent.java
@Singleton
@Component(modules = {AndroidSupportInjectionModule.class,
ApplicationModule.class,
ActivityBindingModule.class,
DataManagerModule.class})
public interface ApplicationComponent extends AndroidInjector<MyApplication> {
DataManagerContract getDataManager();
void inject(MyApplication application);
@Component.Builder
interface Builder {
@BindsInstance
ApplicationComponent.Builder application(Application application);
ApplicationComponent build();
}
}
我的 ActivityBindingModule.java :
@Module
public abstract class ActivityBindingModule {
@ActivityScope
@ContributesAndroidInjector(modules = MainActivityModule.class)
abstract MainActivity bindMainActivity();
@ActivityScope
@ContributesAndroidInjector(modules = SplashActivityModule.class)
abstract SplashActivity bindSplashActivity();
@ActivityScope
@ContributesAndroidInjector(modules = LoginActivityModule.class)
abstract LoginActivity bindLoginActivity();
}
MainActivityModule.java
@Module
public abstract class MainActivityModule {
@ActivityScope
@Binds
abstract MainActivityContract.Presenter provideMainActivityPresenter(MainActivityPresenter presenter);
@FragmentScope
@ContributesAndroidInjector
abstract HomeFragment provideHomeFragment();
@FragmentScope
@Binds
abstract HomeFragmentContract.Presenter provideHomeFragmentPresenter(HomeFragmentPresenter presenter);
// Inject other fragments and presenters
}
SplashActivity和LoginActivity仅取决于他们各自的演示者,并且匕首在这些方面工作得很好。但是我的MainActivity可能包含大量碎片,并在尝试使用以下方法注入其中一个碎片时导致崩溃:
HomeFragment.java
public class HomeFragment extends Fragment {
....
@Override
public void onAttach(Context context) {
AndroidSupportInjection.inject(this);
super.onAttach(context);
}
....
}
这是我崩溃的logcat:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp/com.myapp.main.MainActivity}: java.lang.IllegalArgumentException: No injector factory bound for Class<com.myapp.ui.main.Home.HomeFragment>
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.IllegalArgumentException: No injector factory bound for Class<com.myapp.ui.main.Home.HomeFragment>
at dagger.android.DispatchingAndroidInjector.inject(DispatchingAndroidInjector.java:104)
at dagger.android.support.AndroidSupportInjection.inject(AndroidSupportInjection.java:74)
at com.myapp.ui.main.Home.HomeFragment.onAttach(HomeFragment.java:65)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1363)
at android.support.v4.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1109)
at android.support.v4.app.FragmentTransition.calculateFragments(FragmentTransition.java:996)
at android.support.v4.app.FragmentTransition.startTransitions(FragmentTransition.java:99)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2364)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3221)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3171)
at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:192)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:560)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:177)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1248)
at android.app.Activity.performStart(Activity.java:6696)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2628)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
我不确定代码中的问题在哪里。如果我将HomeFragment的绑定移动到ActivityBindingModule,应用程序运行正常,但如果我将这些绑定带回MainActivityModule,则会发生崩溃。我在这里做错了什么?
修改
public class MyApp extends DaggerApplication {
@Override
protected AndroidInjector<? extends DaggerApplication> applicationInjector() {
return DaggerApplicationComponent.builder().application(this).build();
}
}
和我的主要活动:
public class MainActivity extends AppCompatActivity
implements MainActivityContract.View,
NavigationView.OnNavigationItemSelectedListener {
@Inject
MainActivityContract.Presenter mPresenter;
@Override
protected void onCreate(Bundle savedInstanceState) {
AndroidInjection.inject(this);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Open home fragment on first start
if (savedInstanceState == null) {
// Create new instance of HomeFragment
HomeFragment homeFragment = HomeFragment.newInstance();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.content_main, homeFragment)
.commit();
}
// Other logic
}
答案 0 :(得分:12)
当您使用AndroidSupportInjection.inject(this)
中的HomeFragment
进行注入时,Dagger将遍历父片段层次结构以找到实现HasSupportFragmentInjector
的人。要使其有效,请使用MainActivity
扩展DaggerAppCompatActivity
来实现HasSupportFragmentInjector
。
来自AndroidSupportInjection.inject(Fragment fragment)
的文件:
如果关联{@link,则注入{@code fragment} 可以找到dagger.android.AndroidInjector}实现,否则 抛出{@link IllegalArgumentException}。
使用以下算法查找相应的{@code AndroidInjector}用于注入{@code fragment}:
- 使用父片段层次结构查找实现{@link的片段 HasSupportFragmentInjector},如果没有的话
- 如果它实现了{@code fragment}的{@link Fragment#getActivity()activity} {@link HasSupportFragmentInjector},如果没有
- 如果它实现{@link,则使用{@link android.app.Application} HasSupportFragmentInjector}。
如果他们都没有实现{@link HasSupportFragmentInjector},那么{@link 抛出IllegalArgumentException}。
@throws IllegalArgumentException如果没有父片段,活动或 应用程序 {@link HasSupportFragmentInjector}。
有了这个,Dagger将使用
@FragmentScope
@ContributesAndroidInjector
abstract HomeFragment provideHomeFragment();
从你的MainActivityModule
注入HomeFragment
。
答案 1 :(得分:0)
这种情况可能发生的另一种情况是,您在DialogFragment
中显示了Fragment
。
使用相同的FragmentManager很重要。
例如,您有一个“片段范围屏幕”:
@FragmentScope
@ContributesAndroidInjector(modules = [DetailsInjectors::class])
abstract fun provideHomeFragment() HomeFragment
带有子组件
@Module
abstract class DetailsInjectors {
@ChildFragmentScope
@ContributesAndroidInjector(modules = [DetailsModule::class])
abstract fun provideDetailsFragment(): DetailsDialogFragment
}
这里要注意的重要一点是,当您显示对话框片段时, 您应该使用子片段管理器,而不是活动的。
在这种情况下,如果您从HomeFragment显示对话框,
detailsDialog.show(activity.supportFragmentManager, "some tag)
和
detailsDialog.show(requireFragmentManager(), "some tag)
不起作用。
您应该改为:
detailsDialog.show(childFragmentManager, "some tag)
答案 2 :(得分:0)
就我而言,我没有在@ Fragment
类中定义Module
!所以当我像这样添加它时:
@ActivityScope
@ContributesAndroidInjector(modules = {ActivityModule.class})
abstract InvestmentDetailsFragment bindInvestmentDetailsFragment();
我的问题已解决!