<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <include layout="@layout/top1" />

    <include layout="@layout/top2" />

    <android.support.v4.view.ViewPager

        android:id="@+id/id_viewpager"

        android:layout_width="wrap_content"

        android:layout_height="0dp"

        android:layout_weight="1" >

    </android.support.v4.view.ViewPager>

</LinearLayout>

可能原因：是不是你没有设置父容器的的orientation=vertical