展开嵌套在ContrintLayout中的RecyclerView

我在片段中遇到了一个问题,在初始化适配器之前,我试图膨胀一个视图并验证它是一个RecyclerView。

问题是因为布局不再只是一个RecyclerView组件,我已经将它包装在一个ConstraintLayout中并添加了一个floatingActionButton。

如何膨胀视图的特定部分,或者如何处理适配器从未初始化过的问题,因为 (view instanceof RecyclerView) 代码。

View view = inflater.inflate(R.layout.fragment_search_list, container, false);

Context context = view.getContext();
RecyclerView recyclerView = (RecyclerView) view;

if (view instanceof RecyclerView) {
    recyclerView.setLayoutManager(new LinearLayoutManager(context));

    mySearchRecyclerViewAdapter = new MySearchRecyclerViewAdapter(gameList, mListener);
    recyclerView.setAdapter(mySearchRecyclerViewAdapter);
}

布局:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.scuvanov.weplay.fragment.SearchFragment">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/list"
        android:name="com.scuvanov.weplay.fragment.SearchFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="visible"
        app:layoutManager="LinearLayoutManager"
        tools:listitem="@layout/fragment_search">

    </android.support.v7.widget.RecyclerView>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fabSearch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="15dp"
        android:layout_marginEnd="15dp"
        android:clickable="true"
        android:focusable="true"
        android:src="@drawable/ic_action_search"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

</android.support.constraint.ConstraintLayout>