在RecyclerView外边在嵌套一层RelativeLayout就可以解决了
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/dp_1"
android:layout_marginTop="@dimen/dp_1" />
</RelativeLayout>
