关于android：在视图的底部放置一个linearlayout

Position a linearlayout at the bottom of the view

我希望在我的视图底部有一个不同小部件的"工具栏"......每个小部件都由一个代表图标的ImageView和一个描述的TextView组成。
这是XML代码：

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/linear_layout_shelves"
android:background="@drawable/final_shelves"
android:orientation="vertical">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_marginLeft="70dp"
android:layout_marginRight="65dp"
android:layout_marginTop="@dimen/first_shelf_margin_top"
android:orientation="horizontal">
<ImageView
android:id="@+id/image_11"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="1"
android:src="@drawable/image1"
android:clickable="true"/>
<ImageView
android:id="@+id/image_12"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="1"
android:src="@drawable/image2"
android:clickable="true" />
<ImageView
android:id="@+id/image_13"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_weight="1"
android:src="@drawable/image3"
android:clickable="true" />
</LinearLayout>


<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
>


<RelativeLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/delete_widget"
android:layout_weight="1"
android:visibility="visible">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/cancel_icon"
android:src="@drawable/cancel_128"
android:clickable="true" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel"
android:layout_above="@id/cancel_icon"
android:textColor="@color/white"
android:clickable="true" />
</RelativeLayout>


<RelativeLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/cancel_widget"
android:layout_weight="1"
android:visibility="visible">

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/delete_icon"
android:src="@drawable/delete_blue_128"
android:clickable="true" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete Card"
android:textColor="@color/white"
android:layout_below="@id/delete_icon"
android:clickable="true" />
</RelativeLayout>


<RelativeLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/show_details_widget"
android:layout_weight="1"
android:visibility="visible">

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/show_details_icon"
android:src="@drawable/info_128"
android:clickable="true" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show card details"
android:layout_below="@id/show_details_icon"
android:textColor="@color/white"
android:clickable="true" />

</RelativeLayout>

</LinearLayout>
</LinearLayout>

但我的工具栏实际上只显示在前一个布局的底部。知道如何解决这个问题吗？