如何将URL中的XML数据解析为Google Map V2？
我正在从“http://api.eventful.com/rest/events/search?app_key=42t54cX7RbrDFczc&location=singapore”
中检索经度和纬度我想将lng和lat解析为谷歌地图。 这就是我希望它的工作方式。
By selecting on the "title", it will show me the location of the title on the map.
已检索到标题，lng和lat。
然而，在我的地图中，它没有显示出来。 我可以知道编码的哪一部分，我还没有完成吗？
结论 首先， 我想从api.eventful.com/rest/events / ...中检索“title”，“lng”和“lat”。 我已经做到了...... （：
接着， 我想在谷歌地图上显示位置， 我想要它 在选择“标题”时， 它会告诉我谷歌地图上的位置， 但！ 解析XML数据到谷歌地图的编码， 我不确定..
MainActivity.java
public class MainActivity extends Activity {
ArrayList<String> title;
ArrayList<String> start_time;
ArrayList<String> latitude;
ArrayList<String> longitude;
ItemAdapter adapter1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView list = (ListView) findViewById(R.id.list);
title = new ArrayList<String>();
start_time = new ArrayList<String>();
latitude = new ArrayList<String>();
longitude = new ArrayList<String>();
try {
URL url = new URL(
"http://api.eventful.com/rest/events/search?app_key=42t54cX7RbrDFczc&location=singapore");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(url.openStream()));
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("event");
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
Element fstElmnt = (Element) node;
NodeList nameList = fstElmnt.getElementsByTagName("title");
Element nameElement = (Element) nameList.item(0);
nameList = nameElement.getChildNodes();
title.add(""+ ((Node) nameList.item(0)).getNodeValue());
NodeList websiteList = fstElmnt.getElementsByTagName("start_time");
Element websiteElement = (Element) websiteList.item(0);
websiteList = websiteElement.getChildNodes();
start_time.add(""+ ((Node) websiteList.item(0)).getNodeValue());
NodeList websiteList1 = fstElmnt.getElementsByTagName("latitude");
Element websiteElement1 = (Element) websiteList1.item(0);
websiteList1 = websiteElement1.getChildNodes();
latitude.add(""+ ((Node) websiteList1.item(0)).getNodeValue());
NodeList websiteList2 = fstElmnt.getElementsByTagName("longitude");
Element websiteElement2 = (Element) websiteList2.item(0);
websiteList2 = websiteElement2.getChildNodes();
longitude.add(""+ ((Node) websiteList2.item(0)).getNodeValue());
}
} catch (Exception e) {
System.out.println("XML Pasing Excpetion = " + e);
}
adapter1 = new ItemAdapter(this);
list.setAdapter(adapter1);
}
class ItemAdapter extends BaseAdapter {
final LayoutInflater mInflater;
private class ViewHolder {
public TextView title_text;
public TextView des_text;
}
public ItemAdapter(Context context) {
// TODO Auto-generated constructor stub
super();
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
//@Override
public int getCount() {
return title.size();
}
//@Override
public Object getItem(int position) {
return position;
}
//@Override
public long getItemId(int position) {
return position;
}
//@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (convertView == null) {
view = mInflater.inflate(R.layout.mainpage_list,parent, false);
holder = new ViewHolder();
holder.title_text = (TextView) view.findViewById(R.id.title_text);
holder.des_text = (TextView) view.findViewById(R.id.des_text);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.title_text.setText(""+title.get(position));
holder.des_text.setText(""+Html.fromHtml(start_time.get(position)));
return view;
}
}
public void onListItemClick(ListView parent, View v, int position,long id)
{;
Intent n = new Intent(MainActivity.this,map.class);
n.putExtra("lat",latitude.get(position).toString());
n.putExtra("lng",longitude.get(position).toString());
startActivity(n);
}
}
map.java
public class map extends FragmentActivity {
LatLng storeLocation;
private GoogleMap MAP;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_shown);
Intent n = getIntent();
String latitude = n.getStringExtra("lat");
String longitude= n.getStringExtra("lng");
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
MAP = fm.getMap();
Double lat= Double.parseDouble(latitude);
Double lng= Double.parseDouble(longitude);
MAP = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
// FragmentManager myFM = getActivity().getSupportFragmentManager();
//SupportMapFragment myMAPF = (SupportMapFragment) myFM.findFragmentById(R.id.map);
MAP = myMAPF.getMap();
MAP.setMyLocationEnabled(true);
MAP.setMapType(GoogleMap.MAP_TYPE_NORMAL);
storeLocation = new LatLng(lat,
lng);
MAP.addMarker(new MarkerOptions().position(storeLocation).title(
storeLocation.toString()));
}
}
答案 0 :(得分：1)
您可以使用SAX parser。扩展DefaultHandler并覆盖文档事件方法：startDocument()，endDocument()，startElement()和endElement()。使用characters()方法使用xml标记内所需的任何数据填充StringBuilder，并使用toString()方法内的endElement()调用转储该数据。将数据放入holder类并在解析完成后将其传递给片段/活动。
我在网上寻找一个干净的例子，但我没有看到一个我喜欢的。
您将无法将此代码放入项目中，它旨在用于人类阅读和理解，而不是编译器审查。我希望这个例子可以帮助你：
public class MapDataHandler extends DefaultHandler {
private static final String WHATEVER_XML_TAG_YOU_WANT = //xml tag name as it appears in the document you want to parse.
private StringBuilder mCharacters;
private MapsDataHolder mData; //simple class with nothing but getters and setters
@Override
public void startDocument() throws SAXException {
//Initialize your member variables.
mCharacters = new StringBuilder();
mData = new MapsDataHolder();
}
@Override
public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
mCharacters = new StringBuilder();
//Clear the string builder for every new tag.
//This is so that the contents of previous tags don't linger in the
//StringBuilder when you move on to later tags.
}
@Override
public void endElement (String uri, String localName, String qName) throws SAXException {
if (qName.equals(WHATEVER_XML_TAG_YOU_WANT)) {
String contentsOfThatTag = mCharacters.toString();
mData.setField(contentsOfThatTag); //put the data into your holder class object
} else if (qName.equals(ANOTHER_EXAMPLE_TAG)) {
//dump the contents of mCharacters again
//
}
//parse any other tags you care about with additional 'else if' blocks
}
@Override
public void endDocument() throws SAXException {
mCharacters = null;
}
@Override
public void characters (char[] ch, int start, int length) throws SAXException {
mCharacters.append(ch, start, length);
//keeps a running tally of characters between tags.
}
public MapsDataHolder getData() {
return mData;
}
}
解析完成后，您可以通过回调或您喜欢的任何方式返回MapsDataHolder对象。然后你有一个java类，只有你想要的数据和获取它的访问方法。
答案 1 :(得分：1)
你应该这样做：
public class map extends FragmentActivity {
LatLng storeLocation;
private GoogleMap MAP;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_shown);
Intent n = getIntent();
String latitude = n.getStringExtra("lat");
String longitude= n.getStringExtra("lng");
SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
map = fm.getMap();
Double lat= Double.parseDouble(latitude);
Double lng= Double.parseDouble(longitude);
FragmentManager myFM = getActivity()
.getSupportFragmentManager();
SupportMapFragment myMAPF = (SupportMapFragment) myFM
.findFragmentById(R.id.fragment1);
MAP = myMAPF.getMap();
MAP.setMyLocationEnabled(true);
MAP.setMapType(GoogleMap.MAP_TYPE_NORMAL);
storeLocation = new LatLng(lat,
lng);
MAP.addMarker(new MarkerOptions().position(storeLocation).title(
storeLocation.toString()));
}