xamarin联系人选择器在android设备上的哪个位置检索联系人？

using Android.App;
using Android.Content;
using Android.OS;
using Android.Provider;
using Android.Widget;

namespace XamarinContactPickerDemo
{
    [Activity(Label = "ContactPickerActivity")]
    public class ContactPickerActivity : Activity
    {
        private const int ContactPickerRequestCode = 1;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.activity_main);

            Button pickContactButton = FindViewById<Button>(Resource.Id.pickContactButton);
            pickContactButton.Click += PickContactButton_Click;
        }

        private void PickContactButton_Click(object sender, System.EventArgs e)
        {
            Intent contactPickerIntent = new Intent(Intent.ActionPick, ContactsContract.Contacts.ContentUri);
            StartActivityForResult(contactPickerIntent, ContactPickerRequestCode);
        }

        protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
        {
            if (requestCode == ContactPickerRequestCode && resultCode == Result.Ok)
            {
                var contactUri = data.Data;
                var cursor = ContentResolver.Query(contactUri, null, null, null, null);
                if (cursor.MoveToFirst())
                {
                    var displayName = cursor.GetString(cursor.GetColumnIndex(ContactsContract.ContactsColumns.DisplayNamePrimary));
                    Toast.MakeText(this, "Selected contact: " + displayName, ToastLength.Short).Show();
                }
                cursor.Close();
            }
        }
    }
}