如何在谷歌地图安卓API v2中显示多个带有不同图标的标记

Question

我正在解析一个XML文件，其中包含我的Android应用程序的数据，这些数据将使用Google Maps Android API v2显示在地图上。XML 文件的示例格式为：

<markers>
  <marker name="San Pedro Cathedral"
          address="Davao City"
          lat="7.0647222"
          long="125.6091667"
          icon="church"/>
  <marker name="SM Lanang Premier"
          address="Davao City"
          lat="7.0983333"
          long="125.6308333"
          icon="shopping"/>
  <marker name="Davao Central High School"
          address="Davao City"
          lat="7.0769444"
          long="125.6136111"
          icon="school"/>
</markers>

现在，我想根据标记元素中图标的属性值，使用不同的图标显示地图上的每个标记。我目前通过循环添加标记的代码是：

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse("http://dds.orgfree.com/DDS/landmarks_genxml.php");
NodeList markers = doc.getElementsByTagName("marker");
for (int i = 0; i < markers.getLength(); i++) {
    Element item = (Element) markers.item(i);
    String name = item.getAttribute("name");
    String address = item.getAttribute("address");
    String stringLat = item.getAttribute("lat");
    String stringLong = item.getAttribute("long");
    String icon = item.getAttribute("icon"); //assigned variable for the XML icon attribute
    Double lat = Double.valueOf(stringLat);
    Double lon = Double.valueOf(stringLong);
    map = ((MapFragment) getFragmentManager().findFragmentById(
            R.id.map)).getMap();
    map.addMarker(new MarkerOptions()
            .position(new LatLng(lat, lon))
            .title(name)
            .snippet(address)
            //I have a coding problem here...
            .icon(BitmapDescriptorFactory
                    .fromResource(R.drawable.icon)));
    // Move the camera instantly to City Hall with a zoom of 15.
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(CITYHALL, 15));

我的可绘制文件夹中有教堂、购物、学校等所有不同的图标。但是我对这条线有问题：

.icon(BitmapDescriptorFactory.fromResource(R.drawable.icon)

因为R.drawable仅与可绘制文件夹内的文件有关。如何根据 XML 上的图标属性动态显示每个标记的不同图标？

任何帮助将不胜感激。 :)

Answer 1

获取资源：

getResources().getIdentifier(icon,"drawable", getPackageName())

上面使用的icon是为 XML icon 属性分配的变量

使用此选项可动态获取icon：

.icon(BitmapDescriptorFactory
   .fromResource(getResources().getIdentifier(icon,"drawable", getPackageName()))

Answer 2

尝试如下：

// Creates a marker rainbow demonstrating how to 
// create default marker icons of different.
int numMarkersInRainbow[] = 
{
    R.drawable.arrow,
    R.drawable.badge_nsw,
    R.drawable.badge_qld,
    R.drawable.badge_victoria
};
for (int i = 0; i < markers.getLength(); i++) {
    mMap.addMarker(new MarkerOptions()
        .position(position(new LatLng(lat, lon)))
        .title(name)
        .icon(BitmapDescriptorFactory.fromResource(numMarkersInRainbow[i])));
}