scrollview嵌套recyclerview显示不全现象

   <RelativeLayout
                        android:layout_width="match_parent"
                        android:layout_height="match_parent">

                        <android.support.v7.widget.RecyclerView
                            android:id="@+id/rv_lineView"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:layout_marginTop="20dip"
                            android:clipToPadding="false"
                            tools:listitem="@layout/item_timeline"
                            android:nestedScrollingEnabled="false"/>

  </RelativeLayout>