Question

I’ve got an Activity that holds a ListFragment on the left and a SupportMapFragment on the right.

List and Map are both backed by the same data. The visual representation of the data on the Map are Markers.

I want to be able to perform a click on either a list item or a Marker and get the corresponding item in the other visual representation.

Restrictions of the framework and my data are:

1. The Marker class is final and the Marker’s id does not have a modificator. This is why I can’t use the easiest possible way.

2. “It’s important to not hold on to objects (e.g. Marker) beyond the
   view’s life. Otherwise it will cause a memory leak as the view cannot
   be released.” (see SupportMapFragment)

3. Titles of Markers can occur multiple times. This is why the expensive String comparison is not a way I can go.

Does anyone have a working solution for this issue or can provide a nudge in the right direction?

Answer 1

If you want to be able to register to clicks on a Marker, you’ll need to override the InfoWindowAdapter.

You can provide unique information to the title and snippet of a Marker and implement the interface’s methods in this style:

@Override
public View getInfoWindow(Marker marker) {
  // do nothing here in order to obtain the original info window border.
  return null;
}

@Override
public View getInfoContents(Marker marker) {
  // Create your own view here. Obtain the unique information stored
  //  in title / snippet of the current marker.
  return createdView;
}

Now you can set the OnInfoWindowClickListener and work with the unique information stored there.