Dagger2：没有注射器工厂绑定碎片 [英] Dagger2: no injector factory bound for fragment

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问题描述

我正在尝试转换一个正在构建的项目以将dagger-android API用于DI框架，但是当尝试使用@ContributesAnroidInjector注入片段时，我遇到了一个IllegalArgumentException的死胡同。

I'm trying to convert a project that I'm building to use the dagger-android API for the DI framework, but I'm running into a dead end with an IllegalArgumentException when trying to inject a fragment using @ContributesAnroidInjector.

相关模块和组件如下：

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仅取决于各自的演示者，而dagger在这些演示者中的效果很好。但是我的MainActivity可能包含许多片段，并在尝试使用以下片段注入其中一个片段时导致崩溃：

SplashActivity and LoginActivity only depend on their respective presenters, and dagger works fine in these. But my MainActivity can contain numerous fragments and causes a crash when trying to inject one of those fragments using:

HomeFragment.java 

public class HomeFragment extends Fragment {
    ....
    @Override
    public void onAttach(Context context) {
        AndroidSupportInjection.inject(this);
        super.onAttach(context);
    }
    ....
}

这是我的此崩溃的logcat：

Here is my logcat for this crash: 

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，则该应用程序运行良好，但是如果我将这些绑定重新带回MainActivityModule，则崩溃会再次出现。我在这里做什么错了？

I'm not sure where the problem in the code is. If I move the bindings for HomeFragment to the ActivityBindingModule, the app runs fine, but the crash comes back if I bring those bindings back into the MainActivityModule. What am I doing wrong here?

编辑： 

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
}


推荐答案

当您从 HomeFragment 使用 AndroidSupportInjection.inject（this）进行注入时，Dagger将遍历父片段层次结构，以找到实现 HasSupportFragmentInjector 的人。要使其工作，请使您的 MainActivity 扩展 DaggerAppCompatActivity ，该实现实现 HasSupportFragmentInjector 。

When you inject using AndroidSupportInjection.inject(this) from your HomeFragment, Dagger will walk the parent-fragment hierarchy to find someone that implements HasSupportFragmentInjector. To make it work, make your MainActivity extends DaggerAppCompatActivity which implements HasSupportFragmentInjector.

来自 AndroidSupportInjection.inject（片段片段）：


如果可以找到关联的{@link
dagger.android.AndroidInjector}实现，则注入{@codefragment}，否则
抛出{ @link IllegalArgumentException}。

Injects {@code fragment} if an associated {@link dagger.android.AndroidInjector} implementation can be found, otherwise throws an {@link IllegalArgumentException}.

使用以下算法找到合适的{@code
AndroidInjector}来注入{@codefragment}：

Uses the following algorithm to find the appropriate {@code AndroidInjector} to use to inject {@code fragment}:


  1. 遍历父片段层次结构以找到实现{@link
    HasSupportFragmentInjector}的片段，如果没有，则执行
  2. 如果实现
    {@link HasSupportFragmentInjector}，则使用{@codefragment}的{@link Fragment＃getActivity（）活动}；如果不实现，则使用
  3. {@link android.app.Applicati on}如果实现了{@link
    HasSupportFragmentInjector}。
  1. Walks the parent-fragment hierarchy to find the a fragment that implements {@link HasSupportFragmentInjector}, and if none do
  2. Uses the {@code fragment}'s {@link Fragment#getActivity() activity} if it implements {@link HasSupportFragmentInjector}, and if not
  3. Uses the {@link android.app.Application} if it implements {@link HasSupportFragmentInjector}.

如果它们都不实现{@link HasSupportFragmentInjector}，则会抛出{@link
IllegalArgumentException}。

If none of them implement {@link HasSupportFragmentInjector}, a {@link IllegalArgumentException} is thrown.

@throws IllegalArgumentException如果没有父片段，活动或
应用程序实现
{@link HasSupportFragmentInjector}。

@throws IllegalArgumentException if no parent fragment, activity, or application implements {@link HasSupportFragmentInjector}.

借助此功能，Dagger将使用

With this, Dagger will use

@FragmentScope
@ContributesAndroidInjector
abstract HomeFragment provideHomeFragment();

从您的 MainActivityModule 注入到您的 HomeFragment 。

这篇关于Dagger2：没有注射器工厂绑定碎片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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