2

如何将 XML 数据从 URL 解析到 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。这就是我希望它工作的方式。

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。

但是，在我的地图中，它没有显示出来。我可以知道我的编码的哪一部分，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”……我已经这样做了……（：

接下来，我想在谷歌地图上显示位置，我希望它是在选择“标题”时，它会在谷歌地图上显示位置，但是！将 XML 数据解析为谷歌地图的编码，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); 
        }
}

地图.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()));



}
}
4

2 回答 2

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()));



}
于 2013-08-08T14:37:07.007 回答
1

您可以使用SAX 解析器。扩展DefaultHandler并覆盖文档事件方法：startDocument()、endDocument()、startElement()和endElement(). 使用该方法在 xml 标记characters()中填充您需要的任何数据，并在该方法中通过调用转储该数据。将数据放入持有者类并在解析完成后将其传递给您的片段/活动。StringBuildertoString()endElement()

我在网上寻找一个干净的例子，但我还没有看到一个我喜欢的例子。

您将无法将此代码放入您的项目中，它旨在供人类阅读和理解，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MapsDataHolder通过回调或您喜欢的任何方式返回对象。然后你有一个 java 类，除了你想要的数据和获取它的访问方法之外什么都没有。

于 2013-08-08T12:43:02.767 回答