Android Open Source - surveygcp Marker Manager

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Back to project page surveygcp.

License

The source code is released under:

GNU General Public License

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Java Source Code

package org.droidplanner.gcp.fragments.markers;
//from w  w w.j av  a2  s  . c o m
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import android.content.Context;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

public class MarkerManager {
  public GoogleMap mMap;
  public HashMap<Marker, MarkerSource> hashMap = new HashMap<Marker, MarkerSource>();

  public interface MarkerSource {
    MarkerOptions build(Context context);

    void update(Marker marker, Context context);
  }

  public MarkerManager(GoogleMap map) {
    this.mMap = map;
  }

  public void clear() {
    List<MarkerSource> emptyList = new ArrayList<MarkerSource>();
    removeOldMarkers(emptyList);
  }

  public <T> void updateMarkers(List<T> list, boolean draggable,
      Context context) {
    for (T object : list) {
      updateMarker((MarkerSource) object, draggable, context);
    }
  }

  public void updateMarker(MarkerSource source, boolean draggable,
      Context context) {
    if (hashMap.containsValue(source)) {
      Marker marker = getMarkerFromSource(source);
      source.update(marker, context);
      marker.setDraggable(draggable);
    } else {
      addMarker(source, draggable, context);
    }
  }

  private <T> void removeOldMarkers(List<T> list) {
    List<MarkerSource> toRemove = new ArrayList<MarkerSource>();
    for (Marker marker : hashMap.keySet()) {
      MarkerSource object = getSourceFromMarker(marker);
      if (!list.contains(object)) {
        toRemove.add(object);
      }
    }
    for (MarkerSource markerSource : toRemove) {
      removeMarker(markerSource);
    }
  }

  private boolean removeMarker(MarkerSource object) {
    if (hashMap.containsValue(object)) {
      Marker marker = getMarkerFromSource(object);
      hashMap.remove(marker);
      marker.remove();
      return true;
    } else {
      return false;
    }
  }

  private void addMarker(MarkerSource object, boolean draggable,
      Context context) {
    Marker marker = mMap.addMarker(object.build(context));
    marker.setDraggable(draggable);
    hashMap.put(marker, object);
  }

  public Marker getMarkerFromSource(MarkerSource object) {
    for (Marker marker : hashMap.keySet()) {
      if (getSourceFromMarker(marker) == object) {
        return marker;
      }
    }
    return null;
  }

  public MarkerSource getSourceFromMarker(Marker marker) {
    return hashMap.get(marker);
  }

}

Java Source Code List