CODEWITHSUNDEEP
androidandroid-maps-v2
Asim
Asim

Reputation: 7114

Differentiate between different markers in Maps API v2 (unique identifiers)

I have an ArrayList of a custom class. There are about 10 objects in the list, each with details like Title, Snippet, LatLng. I have successfully added all 10 to a Map by using my custom class functions like getTitle, getSnippet, getLatLng etc.

Now, when I click the info window (of the marker), I want to be able to somehow KNOW which object of my custom class does that marker correspond to.

For example, if I click the McDonald's market, I want to be able to know which item from my ArrayList did that marker belong to.

I've been looking at the MarkerOptions and there doesn't seem to be anything in there that I can use to identify the relevant custom object with.

If the question is too confusing, let me make it simple:

ArrayList<CustomObj> objects = blah
map.addMarker(new MarkerOptions().position(new LatLng(
                            Double.parseDouble(result.get(i).getCompanyLatLng()
                                    .split(",")[0]), Double.parseDouble(result
                                    .get(i).getCompanyLatLng().split(",")[1])))
                                    .title(result.get(i).getCompanyName())
                                    .snippet(result.get(i).getCompanyType())
                                    .icon(BitmapDescriptorFactory
                                            .fromResource(R.drawable.pin)));

Now when this is clicked, I go on to the next page. The next page needs to know WHICH object was clicked so that I can send the other details to that page (e.g. Image URLs that need to be loaded etc).

How do I add a unique integer or any identifier to my marker?

Upvotes: 6

Views: 4126

Answers (5)

Shaishav Jogani
Shaishav Jogani

Reputation: 2121

I am 4 years late to answer but I really amazed why no-one talked about marker.setTag and marker.getTag method.

As written in google API docs,

This is easier than storing a separate Map<Marker, Object>

They have introduce setTag and getTag to avoid use of Map<...>. You can use it as following way.

Marker marker = map.addMarker(...);
marker.setTag(result.get(i));  //Store your marker information here.

//To fetch your object...
map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
    @Override
    public boolean onMarkerClick(Marker marker) {
        CustomObj obj = (CustomObj)marker.getTag();
        //Your click handle event
        // Pass the obj to another activity and you are done
        return false;
    }
});

Upvotes: 0

Alpha Huang
Alpha Huang

Reputation: 1477

According to the discussion at the following link, Marker.equals and Marker.hashCode don't work sometimes. For example, when the map is panned or zoomed, or it's restarted/resumed.

Add Tag / Identifier to Markers

So Marker's ID is a better key than Marker itself for a HashMap.

Map<String, MyObject> markerMap = new HashMap<String, MyObject>();
Marker marker = map.addMarker(...);
MyObject myObject = new MyObject();
markerMap.put(marker.getId(), myObject);

Upvotes: 1

MaciejG&#243;rski
MaciejG&#243;rski

Reputation: 22232

One correct way is to use Map<Marker, CustomObj> which stores all markers:

Marker marker = map.addMarker(...);
map.put(marker, result.get(i));

and in onInfoWindowClick:

CustomObj obj = map.get(marker);

Another try is using Android Maps Extensions, which add getData and setData method to Marker, so you can assign your CustomObj object after creating marker and retrieve it in any callback.

Upvotes: 6

AnujMathur_07
AnujMathur_07

Reputation: 2596

I think using latitude and longitude, this could be done

map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {

        @Override
        public boolean onMarkerClick(final Marker marker) {
            LatLng pos = marker.getPosition();
            int arryListPosition = getArrayListPosition(pos);
            return true;
        }
    });

and the method getArrayListPosition is

private int getArrayListPosition(LatLng pos) {
    for (int i = 0; i < result.size(); i++) {
        if (pos.latitude == result.get(i).getCompanyLatLng().split(",")[0]) {
            if (pos.longitude == result.get(i).getCompanyLatLng()
                    .split(",")[1])
                return i;
        }
    }
    return 0;
}

This method will return you the position of your ArrayList who's Marker you have clicked. and you can get data from that position.

Hope it helps...

Upvotes: 0

Warpzit
Warpzit

Reputation: 28162

I used the the snippet text for saving an unique ID. If you need the snippet it's will be for the popup and there you can just make your own (by finding the object from the ID) so you wont miss it but you'll certainly miss a unique ID for identifying the objects.

To find the right object I just iterate through them:

for(SomeObject anObject : someObjects) {
    if(marker.getSnippet().equalsIgnoreCase(anObject.getID())) {
        //you got at match
    }
}

Upvotes: 1

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