Google Maps v2 Marker zOrdering - Set to top

Aiden Fry's answer works if you do actually display an InfoWindow. If you don't, the marker won't come to the front. Here is a hack to make it come to the front anyway:

Create a custom InfoWindowAdapter that displays a 0dp info window:

public class MapWindowAdapter implements GoogleMap.InfoWindowAdapter {    private Context context = null;    public MapWindowAdapter(Context context) {        this.context = context;    }    // Hack to prevent info window from displaying: use a 0dp/0dp frame    @Override    public View getInfoWindow(Marker marker) {        View v = ((Activity) context).getLayoutInflater().inflate(R.layout.no_info_window, null);        return v;    }    @Override    public View getInfoContents(Marker marker) {        return null;    }}

Here is the code for the layout:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:layout_width="0dp"              android:layout_height="0dp"></LinearLayout>

When you set up your map, set the adapter and custom InfoWindowAdapter and OnMarkerClickListener (using showInfoWindow and returning true as AIden Fry advised):

mMap.setInfoWindowAdapter(new MapWindowAdapter(this));//Call showInfoWindow to put marker on top of others.myMarker.showInfoWindow();

This is not beautiful, but I didn't find any other way to deal with z-indexing without using info windows.

This was added in Google Play Services 9.2 (June 27, 2016)

The new MarkerOptions.zIndex() sets the stack order of a marker in relation to other markers on the map. Read more about marker z-indexes and the effect of z-index on click events. (Issue 4688)

Whilst not the perfect solution! I have figured out how to show a selected (tapped) marker over all other markers by consuming the onMarkerClick event. Returning TRUE will consume this event, so we have to do the showInfoWindow and zoom to center

    @Override    public boolean onMarkerClick(Marker marker) {       //Manually open the window       marker.showInfoWindow();       //Animate to center       sMapFrag_v2.getMap().animateCamera(CameraUpdateFactory.newLatLng(marker.getPosition());       //Consume the method       return true;    }