如何绘制谷歌地图infowindow的锚点部分？

Question

我可以通过将drawable设置为InfoWindowAdapter的视图背景来自定义infowindow。但是，我不知道如何绘制infowindow的锚定部分。

这就是我所做的。

InfoWindowAdapter

  public class MarkerInfoWindowAdapter implements GoogleMap.InfoWindowAdapter {
        private Context context;
        private PelicanApplication appState;
        public MarkerInfoWindowAdapter(Context context,Activity act)
        {
            this.context=context;
            appState = ((PelicanApplication)act.getApplication());
        }
        @Override
        public View getInfoWindow(Marker marker)
        {
            LayoutInflater inflater = LayoutInflater.from(context);
            View v  = inflater.inflate(R.layout.custom_infowindow, null);
            return v;
        }
        @Override
        public View getInfoContents(Marker marker)
        {
            return null;
        }
    }

InfoWindow查看

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

    android:layout_height="fill_parent">



<LinearLayout

    android:orientation="vertical" android:layout_width="300dp"
    android:background="@drawable/bg_infowindow"
    android:layout_height="wrap_content">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:textColor="@color/primary_text_color"
        android:id="@+id/lbl_pickup_address"
        android:layout_gravity="center_horizontal"
        android:gravity="center_horizontal" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@color/primary_text_color"
        android:text="(1km, 5min)"
        android:id="@+id/lbl_info_to_get_sender"
        android:layout_gravity="center_horizontal" />

    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/drawer_divider_width"
        android:background="@color/selector_color"
        android:layout_marginTop="@dimen/drawer_divider2line_width" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:textColor="@color/primary_text_color"
        android:id="@+id/lbl_recipient_address"
        android:layout_gravity="center_horizontal"
        android:gravity="center_horizontal" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@color/primary_text_color"
        android:text="(1km, 5min)"
        android:id="@+id/lbl_info_to_get_recipient"
        android:layout_gravity="center_horizontal" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Large Text"
        android:textColor="@color/primary_text_color"
        android:id="@+id/lbl_price"
        android:layout_gravity="center_horizontal"
        android:textSize="25dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@color/primary_text_color"
        android:text="(1km, 5min)"
        android:id="@+id/lbl_package_details"
        android:layout_gravity="center_horizontal" />


    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/drawer_divider_width"
        android:background="@color/selector_color"
        android:layout_marginTop="@dimen/drawer_divider2line_width" />

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_view_details"
            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/primary_text_color"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="View Details"
            android:layout_gravity="center_vertical" />
    </LinearLayout>


    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/drawer_divider_width"
        android:background="@color/selector_color"
        android:layout_marginTop="@dimen/drawer_divider2line_width" />

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_accept_delivery"
            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/primary_text_color"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="Accept this Delivery"
            android:layout_gravity="center_vertical" />
    </LinearLayout>



</LinearLayout>

</FrameLayout>

如您所见，我将 bg_infowindow 设为背景。

bg_infowindow.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@color/primary_color" />
    <stroke android:width="1dp"
        android:color="@color/selector_color" />
    <corners

        android:radius="5dp" />

</shape>  

到目前为止我得到了什么

我想要什么（我标记了我想要绘制的部分）。在此屏幕截图中，锚点位于infowindow的右侧。我希望它在infowindow的底部

我不想将图片设置为背景