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private void loadResources(ResourcesMapView mapView) {
		ContentResolver cr = getContentResolver();
		AndroidDBResourceManager resourceManager = new AndroidDBResourceManager(cr, this);
		Resource[] resources = resourceManager.loadResources();
		if(resources.length == 0){//first timer or corrupted local data
			AndroidLoadFromServerResourceManager fromServerManager = new AndroidLoadFromServerResourceManager();
			resources = fromServerManager.loadResources();
		}
		ResourcesOverlays[] resourcesOverlays = new GoogleMapResource(resources, this).getResourcesOverlays();
		for (int i = 0; i < resourcesOverlays.length; i++) {
			mapView.getOverlays().add(resourcesOverlays[i]);
		}
	}

package com.jleo.collectme.android;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.jleo.UserInfo;
import com.jleo.collectme.model.Point;
import com.jleo.collectme.model.Resource;
import com.jleo.collectme.model.ResourceType;
import com.jleo.collectme.model.ResourcesManager;
import com.jleo.collectme.util.HttpClientUtil;

public class AndroidLoadFromServerResourceManager implements ResourcesManager {

	public Resource[] loadResources() {
		final List<Resource> resourcesList = new ArrayList<Resource>();
		Map<String, String> params = new HashMap<String,String>();
		
		params.put("account", UserInfo.currentUserInfo.getAccount());
		HttpClientUtil httpClient = new HttpClientUtil();
		HttpClientUtil.Handler handler = new HttpClientUtil.Handler() {
			
			@Override
			public void onSucceed(InputStream is) {
				
                Document document;
				try {
					document = new SAXReader().read(is);
				} catch (DocumentException e) {
					return;
				}   
                List<Element> resoucesElements = document.getRootElement().elements();
                for (Element element : resoucesElements) {
                	int id = Integer.valueOf(element.element("id").getText());
                	String title = element.element("title").getText();
                	String description = element.element("description").getText();
                	ResourceType resouceType = new ResourceType(id, description, title);
                	List<Element> locationElements = element.element("locations").elements();
                	for (Element locationElement : locationElements) {
                		int x = Integer.valueOf(locationElement.element("x").getText());
                		int y = Integer.valueOf(locationElement.element("y").getText());
                		
                		Resource resouce = new Resource(resouceType,new Point(x, y));
                		resourcesList.add(resouce);
                	}
				}
			}
			
			@Override
			public void onFailed() {
				//do nothing
			}
		};
		
		httpClient.get(new Request("http://"+UserInfo.currentUserInfo.getServer() + "/pickitup/resource/load", params), handler);
		return resourcesList.toArray(new Resource[0]);
	}
	
	
}

package com.jleo.collectme.android;

import java.util.HashMap;
import java.util.Map;

public class Request {
		public Request(String url, Map<String, String> params) {
			this.url = url;
			this.params = params;
		}

		public String url;
		public Map<String, String> params = new HashMap<String, String>();

		public String getUrl() {
			return url;
		}

		public Map<String, String> getParams() {
			return params;
		}
	}