Android 在ViewPager中使用RecyclerView

我实现了一个包含3个片段a、B和C的ViewPager。因此，我可以使用幻灯片效果切换片段。但现在我想在每个片段中实现一个RecyclerView

我有一个错误：

java.lang.NullPointerException
            at android.support.v7.widget.RecyclerView.computeHorizontalScrollRange(RecyclerView.java:1153)
            at android.view.View.onDrawScrollBars(View.java:11972)
            at android.view.View.draw(View.java:14471)
            at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:2440)
            at android.view.View.getDisplayList(View.java:13362)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.View.draw(View.java:14182)
            at android.view.ViewGroup.drawChild(ViewGroup.java:3103)
            at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)
            at android.view.View.getDisplayList(View.java:13357)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3077)
            at android.view.View.getDisplayList(View.java:13300)
            at android.view.View.getDisplayList(View.java:13404)
            at android.view.HardwareRenderer$GlRenderer.buildDisplayList(HardwareRenderer.java:1570)
            at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:1449)
            at android.view.ViewRootImpl.draw(ViewRootImpl.java:2377)
            at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2249)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1879)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
            at android.view.Choreographer.doCallbacks(Choreographer.java:574)
            at android.view.Choreographer.doFrame(Choreographer.java:544)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5001)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)

片段A的代码：

@EFragment(R.layout.test_bordeaux_a_view)

公共类TestBordeauxAFragment扩展了片段{

@Bean
DirectionsAdapter mDirectionsAdapter;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.test_bordeaux_a_view, container, false);

    RecyclerView mDirectionsRecyclerView = (RecyclerView) rootView.findViewById(R.id.mDirectionsRecyclerView);
    mDirectionsRecyclerView.setHasFixedSize(true);
    mDirectionsRecyclerView.setItemAnimator(new DefaultItemAnimator());
    LinearLayoutManager mLayoutManagerLM = new LinearLayoutManager(getActivity());
    mLayoutManagerLM.setOrientation(LinearLayoutManager.HORIZONTAL);
    mDirectionsRecyclerView.setLayoutManager(mLayoutManagerLM);
    //mDirectionsRecyclerView.setListener(this);
    mDirectionsRecyclerView.setAdapter(mDirectionsAdapter);

    //Use Retrofit to execute a request on my API
    RestProvider<CityService> bordeauxServiceRestProvider = new RestProvider<>();
    bordeauxServiceRestProvider.getService(CityService.class).getDirections(1, "A", new Callback<Result<Direction>>() {
        @Override
        public void success(Result<Direction> directionResult, Response response) {
            mDirectionsAdapter.addItems(directionResult.getCollection(), mDirectionsAdapter.getItemCount());
            mDirectionsAdapter.notifyDataSetChanged();
        }

        @Override
        public void failure(RetrofitError error) {

        }
    });

    return rootView;
}

@Bean
方向适配器mDirectionsAdapter；
@凌驾
创建视图上的公共视图（布局、充气机、视图组容器、，
Bundle savedInstanceState）{
视图根视图=充气机。充气（R.layout.test\u bordeaux\u a\u视图，容器，错误）；
RecyclerView mDirectionsRecyclerView=（RecyclerView）rootView.findViewById（R.id.mDirectionsRecyclerView）；
mDirectionsRecyclerView.setHasFixedSize（true）；
mDirectionsRecyclerView.setItemAnimator（新的DefaultItemAnimator（））；
LinearLayoutManager mLayoutManagerLM=新的LinearLayoutManager（getActivity（））；
MLAyoutManager.setOrientation（LinearLayoutManager.HORIZONTAL）；
mDirectionsRecyclerView.setLayoutManager（mLayoutManagerLM）；
//mDirectionsRecyclerView.setListener（此）；
MDirectionsRecyclererview.setAdapter（mDirectionsAdapter）；
//使用改装在my API上执行请求
RestProvider bordeauxServiceRestProvider=新的RestProvider（）；
bordeauxServiceRestProvider.getService（CityService.class）.getDirections（1，“A”，新回调（）{
@凌驾
public void成功（结果方向结果响应）{
addItems（directionResult.getCollection（），mDirectionsAdapter.getItemCount（））；
mDirectionsAdapter.notifyDataSetChanged（）；
}
@凌驾
公共无效失败（错误）{
}
});
返回rootView；
}

}

---

感谢您的帮助

您在哪里实例化了mDirectionsAdapter类？我猜他正在使用Android注释，所以bean是为他创建的。您是否尝试过在@afterview方法的

onCreateView

中移动代码？此外，您需要使用@ViewById注释检索UI元素。是的，昆汀我使用AndroidAnnotations，我尝试使用AfterViews方法，但她从未调用过，可能是因为我的ViewPager。我不知道为什么从未调用我的AfterViews方法，有人知道吗？你在哪里实例化mDirectionsAdapter类？我猜他在使用Android注释，所以bean是为他创建的。您是否尝试过在@afterview方法的

onCreateView

中移动代码？此外，您需要使用@ViewById注释检索UI元素。是的，昆汀我使用AndroidAnnotations，我尝试使用AfterViews方法，但她从未调用过，可能是因为我的ViewPager。我不知道为什么我的方法AfterViews从未调用过，有人知道吗？