Android ViewPager 左右滑动-3

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

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginBottom="50dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true">
    </android.support.v4.view.ViewPager>

    <HorizontalScrollView
        android:id="@+id/horizontalScrollView"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:background="@android:color/darker_gray"
        android:fadingEdge="@null"
        android:scrollbars="none" >

        <LinearLayout
            android:id="@+id/ll_main"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@android:color/background_light"
            android:orientation="horizontal"
            android:paddingBottom="5dp"
            android:paddingTop="5dp" >

        </LinearLayout>

    </HorizontalScrollView>

</RelativeLayout>