java.lang.UnsupportedOperationException 尝试注入片段

Question

尝试将片段注入字段时，出现以下异常：

Reason: java.lang.UnsupportedOperationException: You may only 
     use @InjectFragment on fields descended from type Fragment

我也尝试从RoboFragment 派生我的片段，但是没有任何运气。

附带问题：是否可以将 roboguice 3.0b 与导航抽屉片段一起使用？如果，我只是把它当作一个普通的碎片来威胁，我是不是走对了路？

代码摘录

@ContentView(activity_main)
public class MainActivity extends RoboActivity
    implements BoardsDrawerFragment.BoardsDrawerCallbacks
{
     @InjectFragment(fragment_boards_drawer)
     private BoardsDrawerFragment _boardsDrawerFragment;
}

public class BoardsDrawerFragment extends Fragment {

}

调用堆栈

java.lang.UnsupportedOperationException: You may only use @InjectFragment on fields descended from type Fragment
        at roboguice.inject.ViewListener.hear(ViewListener.java:76)
        at com.google.inject.internal.MembersInjectorStore.createWithListeners(MembersInjectorStore.java:102)
        at com.google.inject.internal.MembersInjectorStore.access$000(MembersInjectorStore.java:34)
        at com.google.inject.internal.MembersInjectorStore$1.create(MembersInjectorStore.java:42)
        at com.google.inject.internal.MembersInjectorStore$1.create(MembersInjectorStore.java:39)
        at com.google.inject.internal.FailableCache$1.apply(FailableCache.java:39)
        at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:549)
        at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:419)
        at com.google.inject.internal.util.$CustomConcurrentHashMap$ComputingImpl.get(CustomConcurrentHashMap.java:2041)
        at com.google.inject.internal.FailableCache.get(FailableCache.java:50)
        at com.google.inject.internal.MembersInjectorStore.get(MembersInjectorStore.java:65)
        at com.google.inject.internal.InjectorImpl.getMembersInjector(InjectorImpl.java:950)
        ... 19 more

Answer 1

您应该提供片段的 id，例如：

@InjectFragment(R.id.fragment_boards_drawer)
private BoardsDrawerFragment _boardsDrawerFragment;