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我想在recyclerview上添加浮动操作按钮,但问题是当我点击浮动操作按钮Recyclerview项目时点击如何删除此问题

见下面的代码

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".screens.ShowSubjectsFrag"
    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.support.v7.widget.RecyclerView
        android:id="@+id/MainList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center">
    </android.support.v7.widget.RecyclerView>
    <android.support.design.widget.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@android:drawable/ic_input_add"
        app:layout_anchor="@id/MainList"
        android:layout_margin="@dimen/fab_margin"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />
</RelativeLayout>