底部導航欄懸浮效果

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

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:background="#cecbcb"
                android:gravity="center"
                android:text="商品詳情"
                android:textSize="18sp" />

            <android.support.v4.view.ViewPager
                android:id="@+id/show_view"
                android:layout_width="match_parent"
                android:layout_height="360dp" />

            <TextView
                android:id="@+id/show_title"
                android:layout_width="match_parent"
                android:layout_height="60dp" />

            <TextView
                android:id="@+id/show_price"
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:textColor="#ffff00" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="@string/gwc"
                android:textColor="#f00" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="@string/gwc"
                android:textColor="#ffff00" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="@string/gwc"
                android:textColor="#ffff00" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="@string/gwc"
                android:textColor="#ffff00" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="@string/gwc"
                android:textColor="#ffff00" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="@string/gwc"
                android:textColor="#f00" />
            <TextView
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="@string/gwc"
                android:textColor="#f00" />
        </LinearLayout>
    </ScrollView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_gravity="bottom"
        android:orientation="horizontal">

        <RadioGroup
            android:layout_width="0dp"
            android:layout_weight="9"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:gravity="center">

            <RadioButton
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:button="@null"
                android:gravity="center"
                android:drawableTop="@drawable/qie"
                android:text="@string/gys" />

            <RadioButton
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:gravity="center"
                android:button="@null"
                android:drawableTop="@drawable/qie"
                android:text="@string/dp" />

            <RadioButton
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:gravity="center"
                android:button="@null"
                android:drawableTop="@drawable/qie"
                android:text="@string/gz" />

            <RadioButton
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:button="@null"
                android:gravity="center"
                android:drawableTop="@drawable/qie"
                android:text="@string/gwc" />
        </RadioGroup>
        <Button
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="3"
            android:text="@string/jiaru"
            android:background="#f00"
            />
    </LinearLayout>
</FrameLayout>