"fix" for black surface artefact left by MapFragment when transitioned in a ViewPager on old API versions

main.xml

<?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:orientation="vertical" >

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >

        <android.support.v4.view.ViewPager
            android:id="@+id/fragment_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </android.support.v4.view.ViewPager>
    
        <!-- hack to fix ugly black artefact with maps v2 -->
        <FrameLayout 
            android:layout_width="match_parent"
            android:layout_height="match_parent" 
            android:background="@android:color/transparent" />
      
    </FrameLayout>

    <include
        android:id="@+id/info_panel"
        layout="@layout/info_panel" />

</LinearLayout>