请问Android中怎么在一个线性布局里面添加多个图表控件

图表控件我用的是AchartEngine

设置好数据和样式之后

用ChartFactory.getXXXXXChartView方法，获得图表的View

然后通过linearLayout.addView(getPieView());

填充到vertical的线性布局里面

填充一个图表的View时，显示是正常的

但填充2个或以上的时候，就只会显示第一个

后面我在线性布局外层又添加了一个垂直的ScrollView

也不行，也只是显示第一个而已

xml布局如下

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="@color/back"

    android:orientation="vertical" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginBottom="10dp"

        android:layout_marginTop="10dp"

        android:orientation="horizontal" >

        <LinearLayout

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:gravity="center"

            android:orientation="vertical" >

            <TextView

                android:id="@+id/textView2"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="请选择时间段："

                android:textColor="@color/gray_dark"

                android:textSize="@dimen/normal" />

        </LinearLayout>

        <LinearLayout

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:gravity="center"

            android:orientation="horizontal" >

            <TextView

                android:id="@+id/tv_tongji_yingyeXY_timestart"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="2015-06-07"

                android:textColor="@color/gray_dark"

                android:textSize="@dimen/normal" />

            <TextView

                android:id="@+id/textView3"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:layout_marginLeft="5dp"

                android:layout_marginRight="5dp"

                android:text="至"

                android:textColor="@color/gray_dark"

                android:textSize="@dimen/normal"

                android:visibility="visible" />

            <TextView

                android:id="@+id/tv_tongji_yingyeXY_timeend"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="2015-07-10"

                android:textColor="@color/gray_dark"

                android:textSize="@dimen/normal" />

        </LinearLayout>

    </LinearLayout>

    <ScrollView

        android:id="@+id/scrollView1"

        android:layout_width="match_parent"

        android:layout_height="fill_parent"

        android:fillViewport="true" >

        <LinearLayout

            android:id="@+id/layout_yingyeXYView"

            android:layout_width="fill_parent"

            android:layout_height="fill_parent"

            android:background="@color/back"

            android:orientation="vertical" >

        </LinearLayout>

    </ScrollView>

</LinearLayout>

请问有什么解决方法吗，让这个布局里面能显示多个图表的控件