在xamarin android中显示顶部有3个点的viewpager

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <LinearLayout
        android:id="@+id/indicatorLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal">

        <View
            android:id="@+id/indicator1"
            android:layout_width="10dp"
            android:layout_height="10dp"
            android:layout_margin="5dp"
            android:background="@drawable/indicator_selected" />

        <View
            android:id="@+id/indicator2"
            android:layout_width="10dp"
            android:layout_height="10dp"
            android:layout_margin="5dp"
            android:background="@drawable/indicator_unselected" />

        <View
            android:id="@+id/indicator3"
            android:layout_width="10dp"
            android:layout_height="10dp"
            android:layout_margin="5dp"
            android:background="@drawable/indicator_unselected" />

    </LinearLayout>

</LinearLayout>

public class MyPagerAdapter : FragmentPagerAdapter
{
    private List<Fragment> fragments;

    public MyPagerAdapter(FragmentManager fm, List<Fragment> fragments) : base(fm)
    {
        this.fragments = fragments;
    }

    public override int Count => fragments.Count;

    public override Fragment GetItem(int position)
    {
        return fragments[position];
    }
}

ViewPager viewPager = FindViewById<ViewPager>(Resource.Id.viewPager);
LinearLayout indicatorLayout = FindViewById<LinearLayout>(Resource.Id.indicatorLayout);

List<Fragment> fragments = new List<Fragment>();
fragments.Add(new Fragment1());
fragments.Add(new Fragment2());
fragments.Add(new Fragment3());

MyPagerAdapter adapter = new MyPagerAdapter(SupportFragmentManager, fragments);
viewPager.Adapter = adapter;

viewPager.PageSelected += (sender, e) =>
{
    for (int i = 0; i < indicatorLayout.ChildCount; i++)
    {
        View indicator = indicatorLayout.GetChildAt(i);
        indicator.Background = (i == e.Position) ? Resources.GetDrawable(Resource.Drawable.indicator_selected) : Resources.GetDrawable(Resource.Drawable.indicator_unselected);
    }
};

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#FF0000" />
</shape>

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="#CCCCCC" />
</shape>