GeoChatMapActivity.java :  » Chat-Messenger » geochat-android » org » instedd » geochat » map » Android Open Source

package org.instedd.geochat.map;

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

import org.instedd.geochat.Menues;
import org.instedd.geochat.R;
import org.instedd.geochat.api.User;
import org.instedd.geochat.data.GeoChatProvider;
import org.instedd.geochat.data.GeoChat.Messages;
import org.instedd.geochat.data.GeoChat.Users;

import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;

public class GeoChatMapActivity extends MapActivity {
  
  private final Handler handler = new Handler();
  private MapView mapView;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
      setContentView(R.layout.map);
      
      mapView = (MapView) findViewById(R.id.mapview);
      mapView.setBuiltInZoomControls(true);
      
      new Thread() {
        public void run() {
          loadUsers();
        };
      }.start();
  }
  
  private void loadUsers() {
    boolean targetIsMessage = false;
    String targetLogin =  null;
    double targetLat = 0;
    double targetLng = 0;
    if (getIntent().getData() != null) {
      int match = GeoChatProvider.URI_MATCHER.match(getIntent().getData());
      if (match == GeoChatProvider.USER_LOGIN || match == GeoChatProvider.USER_ID) {
        targetLogin = getIntent().getData().getPathSegments().get(1);
      } else if (match == GeoChatProvider.MESSAGE_ID) {
        Cursor c = getContentResolver().query(getIntent().getData(), new String[] { Messages._ID, Messages.LAT, Messages.LNG }, null, null, null);
        if (c.moveToNext()) {
          targetLat = c.getDouble(1);
          targetLng = c.getDouble(2);
          targetIsMessage = true;
        }
        c.close();
      }
    }
    
    Map<String, Map<String, List<User>>> mapByLocation = new HashMap<String, Map<String, List<User>>>();  
        String[] PROJECTION = new String[] {
                Users._ID,
                Users.LOGIN,
                Users.DISPLAY_NAME,
                Users.LAT,
                Users.LNG,
        };
        
        Cursor c = getContentResolver().query(Users.CONTENT_URI, PROJECTION, null, null, "lower(" + Users.DISPLAY_NAME + ")");
        while(c.moveToNext()) {
          User user = new User();
          user.login = c.getString(c.getColumnIndex(Users.LOGIN));
          user.displayName = c.getString(c.getColumnIndex(Users.DISPLAY_NAME));
          user.lat = c.getDouble(c.getColumnIndex(Users.LAT));
          user.lng = c.getDouble(c.getColumnIndex(Users.LNG));
          if (user.lat == 0 && user.lng == 0)
            continue;
          
          String groupingKey = (int)(user.lat * 10) + "," + (int)(user.lng * 10);
          Map<String, List<User>> groupingMap = mapByLocation.get(groupingKey);
          if (groupingMap == null) {
            groupingMap = new HashMap<String, List<User>>();
            mapByLocation.put(groupingKey, groupingMap);
          }
          
          String key = user.lat + "," + user.lng;
          List<User> users = groupingMap.get(key);
          if (users == null) {
            users = new ArrayList<User>();
            groupingMap.put(key, users);
          }
          users.add(user);
          
          if (!targetIsMessage && targetLogin != null && targetLogin.equals(user.login)) {
            targetLat = user.lat;
            targetLng = user.lng;
          }
        }
        c.close();
        
        for(Map.Entry<String, Map<String, List<User>>> entry : mapByLocation.entrySet()) {
          mapView.getOverlays().add(new UserGroupsOverlay(entry.getValue()));  
        }
        
        if (targetIsMessage) {
          mapView.getOverlays().add(new GreenDotOverlay(new GeoPoint((int)(targetLat * 1E6), (int)(targetLng * 1E6))));
        }
        
        if (targetLat != 0 || targetLng != 0) {
          MapController controller = mapView.getController();
          controller.setCenter(new GeoPoint((int)(targetLat * 1E6), (int)(targetLng * 1E6)));
          controller.setZoom(13);
        }
  }
  
  @Override
  protected boolean isRouteDisplayed() {
    return false;
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    Menues.home(menu);
    Menues.compose(menu);
    Menues.reportMyLocation(menu);
    Menues.settings(menu);
    Menues.signout(menu);
    return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    Menues.executeAction(this, handler, item.getItemId());
    return true;
  }

}