如何在Google Maps Android API v2中显示具有不同图标的多个标记?

时间:2013-01-30 08:45:32

标签: android google-maps google-maps-markers google-maps-android-api-2 google-maps-mobile

我正在解析一个XML文件,其中包含我的Android应用程序的数据,该数据将使用Google Maps Android API v2在地图上显示。 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,使用不同的图标在地图上显示每个标记。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));

在我的可绘制文件夹中,我有教堂,购物,学校等所有不同的图标。但是我遇到了问题:

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

因为R.drawable仅适用于可绘制文件夹中的文件。如何能够动态地根据XML上的图标属性为每个标记显示不同的图标?

非常感谢任何帮助。 :)

2 个答案:

答案 0 :(得分:4)

获取资源:

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

上面使用的icon被指定为XML icon属性

的变量

使用它来动态获取icon

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

答案 1 :(得分:3)

试试如下:

// 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])));
}