Android Recyclerview布局在片段内未正确显示

我在

片段中使用
RecyclerView
填充项目列表。我能够获得列表，但是显示的布局没有正确显示。该列表仅包含5项，并且仅正确显示4项

public class Old extends Fragment {

    public Old() {}

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);

        View rootView = inflater.inflate(old_layout, container, false);

        RecyclerView mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        mRecyclerView.setHasFixedSize(true);

        DatabaseData data = new DatabaseData(getActivity());
        List<OldModel> oldModelList = data.getOldData();

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this.getActivity());
        mRecyclerView.setLayoutManager(linearLayoutManager);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);

        OldAdapter oldAdapter = new OldAdapter(getActivity(), oldModelList);
        mRecyclerView.setAdapter(oldAdapter );

        return rootView;
    }
}

recyclerview.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/old_layout"
    tools:context=".Old">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="vertical" />


</RelativeLayout>


快走

app:layout\u behavior=“@string/appbar\u scrolling\u view\u behavior”
从reycerview.xml到
include
标记内部

<include layout="@layout/recylerview"
     android:layout_height="wrap_content"
     android:layout_width="match_parent"
     android:layout_below="@+id/appBar"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/>


布局应该是什么样子？“我觉得它看起来很好。@TobiasBaumeister列表上的第一项显示不正确。清单上只有5项
<include layout="@layout/recylerview"
     android:layout_height="wrap_content"
     android:layout_width="match_parent"
     android:layout_below="@+id/appBar"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/>