android:clipChildren属性，子布局超出父布局；

是否允许子View超出父View的范围，Boolean型true 、false ，默认true不允许；

android:clipChildren="true":如下

android:clipChildren="false":如下

代码：

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

    <RelativeLayout
        android:id="@+id/rl"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:clipChildren="false"
        android:background="#ffffff">

        <RadioGroup
            android:id="@+id/rg"
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:background="#ffffff"
            android:clipChildren="false"
            android:gravity="bottom"
            android:orientation="horizontal">

            <RadioButton
                android:id="@+id/rb_home"
                style="@style/main_tab_button"
                android:drawableTop="@drawable/rgbtn_home_select"
                android:text="主页"/>

            <RadioButton
                android:id="@+id/rb_shoppingcart"
                style="@style/main_tab_button"
                android:drawableTop="@drawable/rgbtn_gouwuche_select"
                android:text="购物车"/>
            <ImageView
                android:id="@+id/iv"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:src="@mipmap/ic_launcher_round"
                android:layout_height="68dp" />

            <RadioButton
                android:id="@+id/rb_orderfrom"
                style="@style/main_tab_button"
                android:drawableTop="@drawable/rgbtn_orderfrom_select"
                android:text="分类"/>

            <RadioButton
                android:id="@+id/rb_my"
                style="@style/main_tab_button"
                android:drawableTop="@drawable/rgbtn_my_select"
                android:text="个人"/>
        </RadioGroup>
        <View
            style="@style/Line_e0e0e0_Horizontal"/>
    </RelativeLayout>
    <FrameLayout
        android:id="@+id/fl"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/rl"
        ></FrameLayout>
</RelativeLayout>