在地图上动态显示Android多重覆盖

Question

我希望获得关于获取纬度和经度的一些帮助。我的意思是：我从网上解析了经纬度（使用XMLPullParser）。现在，我最大的问题是获取所有的值（经纬度）并将它们绘制在地图上。请帮忙！

这里是我的分析器类：

public class Parser { 

//Feed Parsing Method 
public ArrayList<Bakery> parse(String url) { 

    //Array of Episode Objects 
    ArrayList<Bakery> bakeries = null; 

    try { 
     //Encode the URL into a URL Object 
     URL bakery_feed_url = new URL(url); 

     //Open a Connection to the feed 
     XmlPullParser parser = Xml.newPullParser(); 

     try { 
      parser.setInput(bakery_feed_url.openConnection().getInputStream(), null); 
     } finally { 

     } 

     int event_type = parser.getEventType(); 
     Bakery current_bakery = null; 
     boolean done = false; 

     //Parse the feed, start reading throughout the feed from top to bottom 
     while (event_type != XmlResourceParser.END_DOCUMENT && !done){ 

      String tag_name = null; 
      /* 
      lat = Integer.parseInt(parser.getAttributeValue(null,"lat")); 
      lon = Integer.parseInt(parser.getAttributeValue(null,"lon")); 
      grade = Integer.parseInt(parser.getAttributeValue(null,"grade")); 
      */ 
      switch (event_type){ 
       //Found the start of the feed 
       case XmlResourceParser.START_DOCUMENT: 
        bakeries = new ArrayList<Bakery>(); 
        break; 
       //Found a start tag 
       case XmlResourceParser.START_TAG: 
        //apply the data to our Episode object based on the tag name 
        tag_name = parser.getName(); 
        if(tag_name.equalsIgnoreCase("place")){ 
         current_bakery = new Bakery(); 
        }else if(current_bakery != null){ 
         if (tag_name.equalsIgnoreCase("phone_number")){ 
          current_bakery.setPhone(parser.nextText()); 
         }else if(tag_name.equalsIgnoreCase("city")){ 
          current_bakery.setCity(parser.nextText()); 
         }else if(tag_name.equalsIgnoreCase("province")){ 
          current_bakery.setState(parser.nextText()); 
         }else if(tag_name.equalsIgnoreCase("address")){ 
          current_bakery.setAddress(parser.nextText()); 
         }else if(tag_name.equalsIgnoreCase("lat")){ 
          current_bakery.setLatitude(parser.nextText()); 
          //double lat = Integer.parseInt(parser.getAttributeValue(null,"lat")); 
          // current_bakery.setLater(Integer.parseInt(parser.getAttributeValue(null, "lat"))); 
         }else if(tag_name.equalsIgnoreCase("postal_code")){ 
          current_bakery.setZip(parser.nextText()); 
         }else if(tag_name.equalsIgnoreCase("lng")){ 
          current_bakery.setLongitude(parser.nextText()); 
         }else if(tag_name.equalsIgnoreCase("name")){ 
          current_bakery.setPlace_name(parser.nextText()); 
         } 
        } 

        break; 
       //An end tag has been reached 
       case XmlResourceParser.END_TAG: 
        tag_name = parser.getName(); 
        //End of an Episode Item 
        if (tag_name.equalsIgnoreCase("place") && current_bakery != null){ 
         bakeries.add(current_bakery); 
        //Reached the end of all bakeries, no more data to collect 
        } else if (tag_name.equalsIgnoreCase("places")){ 
         done = true; 
        } 
        break; 
      } 
      event_type = parser.next(); 
     } 
    } catch (Exception e) { 
     throw new RuntimeException(e); 
    } 

    //Return the Episode Array 
    return bakeries; 
} 

} 

正如你看到的，我解析的纬度和经度好的，但同样的，因为我得到这一切为字符串，我有麻烦将其转换为INT然后将其提供给OverlayItems类。我希望我不会让这个过于复杂。

Answer 1

我使用ItemizedOverlay这样的：

import java.util.ArrayList; 

import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.graphics.drawable.Drawable; 

import com.google.android.maps.OverlayItem; 

public class ItemizedOverlay extends com.google.android.maps.ItemizedOverlay<OverlayItem> { 

    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); 
    private Context mContext; 

    public csItemizedOverlay(Drawable defaultMarker) { 
     super(boundCenterBottom(defaultMarker)); 
    } 

    public csItemizedOverlay(Drawable defaultMarker, Context context) { 
      super(boundCenterBottom(defaultMarker)); 
      mContext = context; 
    } 

    public void addOverlay(OverlayItem overlay) { 
     mOverlays.add(overlay); 
     populate(); 
    } 

    @Override 
    protected OverlayItem createItem(int i) { 
     return mOverlays.get(i); 
    } 

    @Override 
    public int size() { 
     return mOverlays.size(); 
    } 

    @Override 
    protected boolean onTap(int index) { 
     OverlayItem item = mOverlays.get(index); 
     AlertDialog.Builder dialog = new AlertDialog.Builder(mContext); 
     dialog.setTitle(item.getTitle()); 
     dialog.setMessage(item.getSnippet()); 
     dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int id) { 
      } 
     }); 
     dialog.show(); 
     return true; 
    } 
} 

，然后当我需要的物品适用于覆盖我不喜欢这样写道：

public void drawOverlay(MapView mapView) { 
    List<Overlay> mapOverlays = mapView.getOverlays(); 
    mapOverlays.clear(); 
    mapView.invalidate(); 

    int zoomLevel = mapView.getZoomLevel(); 

    Drawable drawable = this.getResources().getDrawable(R.drawable.myDrawable); 
    ItemizedOverlay itemizedoverlay[] = new ItemizedOverlay[myList.size()]; 
    for (int i = 0; i < myList.size(); i++) { 
     Foo foo = myList.get(i); 
     GeoPoint point = new GeoPoint((int)(foo.lattitude * 1E6), 
             (int)(foo.longtitude * 1E6)); 

     OverlayItem overlayItem = new OverlayItem(point, foo.titel, foo.description); 
     itemizedoverlay[i].addOverlay(overlayItem); 
     mapOverlays.add(itemizedoverlay[i]); 
    } 
} 

希望这是你在找什么。