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Google Maps API v2: How to make markers clickable?

Posted by: admin November 30, 2017 Leave a comment

Questions:

How to I make the markers in Android Google Maps API v2 become clickable so they will either bring up a menu with options or just start a new activity? I believe I made the markers in my app currently in a “newb” method. I didn’t assign them a name or a method to be able to link it in with the rest of the required code.

googleMap.addMarker(new MarkerOptions()
        .position(latLng)
        .title("My Spot")
        .snippet("This is my spot!")
        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));

If you ANSWER this, please include a sample code of a marker being introduced with a unique name and then being set as clickable to open a new activity.

Answers:

All markers in Google Android Maps Api v2 are clickable. You don’t need to set any additional properties to your marker.
What you need to do – is to register marker click callback to your googleMap and handle click within callback:

public class MarkerDemoActivity extends android.support.v4.app.FragmentActivity
    implements OnMarkerClickListener
{
    private Marker myMarker;    

    private void setUpMap()
    {
        .......
        googleMap.setOnMarkerClickListener(this);

        myMarker = googleMap.addMarker(new MarkerOptions()
                    .position(latLng)
                    .title("My Spot")
                    .snippet("This is my spot!")
                    .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
        ......
    }

    @Override
    public boolean onMarkerClick(final Marker marker) {

        if (marker.equals(myMarker)) 
        {
            //handle click here
        }
    }
}

Questions:
Answers:

setTag(position) while adding marker to map.

Marker marker =  map.addMarker(new MarkerOptions()
                .position(new LatLng(latitude, longitude)));
marker.setTag(position);

getTag() on setOnMarkerClickListener listener

map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
                @Override
                public boolean onMarkerClick(Marker marker) {
                    int position = (int)(marker.getTag());
                   //Using position get Value from arraylist 
                    return false;
                }
            });

Questions:
Answers:

Another Solution : you get the marker by its title

public class MarkerDemoActivity extends android.support.v4.app.FragmentActivity
implements OnMarkerClickListener
{
    private Marker myMarker;    

    private void setUpMap()
   {
    .......
    googleMap.setOnMarkerClickListener(this);

    myMarker = googleMap.addMarker(new MarkerOptions()
                .position(latLng)
                .title("My Spot")
                .snippet("This is my spot!")
                .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
    ......
}

@Override
public boolean onMarkerClick(final Marker marker) {

   String name= marker.getTitle();

    if (name.equalsIgnoreCase("My Spot")) 
    {
        //write your code here
    }
}

}

Questions:
Answers:

Here is my whole code of a map activity with 4 clickable markers. Click on a marker shows an info window, and after click on info window you are going to another activity: English, German, Spanish or Italian. If you want to use OnMarkerClickListener in spite of OnInfoWindowClickListener, you just have to swap this line:

mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener()

to this:

mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener()

this line:

public void onInfoWindowClick(Marker arg0)

to this:

public boolean onMarkerClick(Marker arg0)

and at the end of the method “onMarkerClick”:

return true;

I think it may be helpful for someone 😉

package pl.pollub.translator;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
        Toast.makeText(this, "Choose a language.", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener()
        {

            @Override
            public void onInfoWindowClick(Marker arg0) {
                if(arg0 != null && arg0.getTitle().equals("English")){
                Intent intent1 = new Intent(MapsActivity.this, English.class);
                startActivity(intent1);}

                if(arg0 != null && arg0.getTitle().equals("German")){
                Intent intent2 = new Intent(MapsActivity.this, German.class);
                startActivity(intent2);} 

                if(arg0 != null && arg0.getTitle().equals("Italian")){
                Intent intent3 = new Intent(MapsActivity.this, Italian.class);
                startActivity(intent3);}

                if(arg0 != null && arg0.getTitle().equals("Spanish")){
                Intent intent4 = new Intent(MapsActivity.this, Spanish.class);
                startActivity(intent4);}
            }
        });
        LatLng greatBritain = new LatLng(51.30, -0.07);
        LatLng germany = new LatLng(52.3107, 13.2430);
        LatLng italy = new LatLng(41.53, 12.29);
        LatLng spain = new LatLng(40.25, -3.41);
        mMap.addMarker(new MarkerOptions()
                .position(greatBritain)
                .title("English")
                .snippet("Click on me:)"));
        mMap.addMarker(new MarkerOptions()
                .position(germany)
                .title("German")
                .snippet("Click on me:)"));
        mMap.addMarker(new MarkerOptions()
                .position(italy)
                .title("Italian")
                .snippet("Click on me:)"));
        mMap.addMarker(new MarkerOptions()
                .position(spain)
                .title("Spanish")
                .snippet("Click on me:)"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(greatBritain));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(germany));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(italy));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(spain));
    }
}

Questions:
Answers:

Avoid using Activity implements OnMarkerClickListener, use a local OnMarkerClickListener

// Not a good idea
class MapActivity extends Activity implements OnMarkerClickListener {
}

You will need a map to lookup the original data model linked to the marker

private Map<Marker, Map<String, Object>> markers = new HashMap<>();

You will need a data model

private Map<String, Object> dataModel = new HashMap<>();

Put some data in the data model

dataModel.put("title", "My Spot");
dataModel.put("snipet", "This is my spot!");
dataModel.put("latitude", 20.0f);
dataModel.put("longitude", 100.0f);

When creating a new marker using a data model add both to the maker map

Marker marker = googleMap.addMarker(markerOptions);
markers.put(marker, dataModel);

For on click marker event, use a local OnMarkerClickListener:

@Override
public void onMapReady(GoogleMap googleMap) {
    // grab for laters
    this.googleMap = googleMap;

    googleMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
        @Override
        public boolean onMarkerClick(Marker marker) {
            Map dataModel = (Map)markers.get(marker);
            String title = (String)dataModel.get("title");
            markerOnClick(title);

            return false;
        }
    });

    mapView.onResume();

    showMarkers();

    ZoomAsync zoomAsync = new ZoomAsync();
    zoomAsync.execute();
}

For displaying the info window retrieve the original data model from the marker map:

@Override
public void onMapReady(GoogleMap googleMap) {
    this.googleMap = googleMap;
    googleMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
        @Override
        public void onInfoWindowClick(Marker marker) {
            Map dataModel = (Map)markers.get(marker);
            String title = (String)dataModel.get("title");

            infoWindowOnClick(title);
        }
    });

Questions:
Answers:

I have edited the given above example…

public class YourActivity extends implements OnMarkerClickListener
{
    ......

    private void setMarker()
    {
        .......
        googleMap.setOnMarkerClickListener(this);

        myMarker = googleMap.addMarker(new MarkerOptions()
                    .position(latLng)
                    .title("My Spot")
                    .snippet("This is my spot!")
                    .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
        ......
    }

    @Override
    public boolean onMarkerClick(Marker marker) {

       Toast.makeText(this,marker.getTitle(),Toast.LENGTH_LONG).show();
    }
}