listView后面加控件，防止被挤

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

    >
    <RelativeLayout
        android:id="@+id/search_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="48dp"
         android:layout_margin="10dp"
           >
        <TextView
            android:id="@+id/btn_search_around"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:background="@drawable/map_search_btn"
             android:gravity="center"
            android:padding="12dp"
            android:text="搜索"
             android:textColor="@color/white"
            android:textSize="12dp"/>
        <ImageView
            android:id="@+id/img_back"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:src="@drawable/back_gray"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="10dp"
             />
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerVertical="true"
            android:orientation="horizontal"
            android:layout_toRightOf="@id/img_back"
            android:layout_toLeftOf="@+id/btn_search_around"
            android:background="@drawable/search_input_half"
            android:gravity="center_vertical" >
            <AutoCompleteTextView
                android:id="@+id/input_edittext"
                android:layout_width="0dp"
                android:layout_weight="2"
                android:layout_height="match_parent"
                android:drawableLeft="@drawable/search_input"
                android:background="@color/transparent"
                android:hint="请输入搜索关键字"
                android:textColorHint="@color/check_gray"
                android:singleLine="true"
                android:textColor="@color/check_gray"
                android:textSize="14sp" />
            <ImageView
                android:id="@+id/img_clear"
                android:layout_width="18dp"
                android:layout_height="18dp"
                android:src="@drawable/common_input_box_clear"
                android:layout_marginRight="5dp"/>
        </LinearLayout>
    </RelativeLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <ListView
            android:id="@+id/lv_record"
            android:layout_marginTop="20dp"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            >
        </ListView>
        <LinearLayout
            android:id="@+id/ll_clear"
            android:layout_width="match_parent"
             android:orientation="vertical"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            >
            <View
                android:layout_width="match_parent"
                android:layout_height="1px"
                android:background="@color/main_view_split_line_color"
                />
            <TextView
                android:id="@+id/tv_clear"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="清空历史记录"
                android:textSize="@dimen/word_small"
                android:textColor="@color/check_gray"
                android:padding="10dp"
                android:gravity="center"
                android:layout_marginBottom="10dp"
                android:background="@color/white"
                />
        </LinearLayout>

    </LinearLayout>

</LinearLayout>