Android, How to remove all markers from Google Map V2?

Question

I have map view in my fragment. I need to refresh map and add different markers based on condition. So, I should remove last markers from map before add new markers.

Answer 1

Suppose there is an ArrayList of 2 locations. Now, you display markers on the map based on that array. There will be two markers. When you click on the first marker it gives you a marker index m0 and the second is m1.

Say that you refresh location array and now you got an array with 3 locations. You got 3 markers. But when you click on the first one, it gives you marker index m2 (as if it continues counting from the first location arraw) the second is m3 and the third is m4. What you actually want is to make it as m0, m1, m2.

Now, when you build you location array you probably call location.add("you location")... and when you rebuild it (refresh it) you call location.clear() first and then build it again.

SOLUTION:

First, make another dummy array similar to location array and build it in for loop together with a real location array: locaionDummy.add(i) but don't you EVER refresh it - that way it keeps building and you will know how many locations you've ever had from the very beginning.

Second, do something like this (example of setting image) with mIndex as int variable:

void locatePins() {  

mIndex = locationDummy.size()-location.size();

for (int i = 0; i < userID.size(); i++) {

    LatLng pgLocation = new LatLng(Double.parseDouble(latArr.get(i)), Double.parseDouble(lngArr.get(i)));

    myMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {    
        @Override
        public View getInfoWindow(Marker marker) {

        View view = getLayoutInflater().inflate(R.layout.map_marker_info, null);

        RelativeLayout markerInfo= view.findViewById(R.id.markerInfo);
        TextView name = view.findViewById(R.id.userName);
        TextView details = view.findViewById(R.id.userInfo);
        ImageView img = view.findViewById(R.id.userImg);

        name.setText(marker.getTitle());
        details.setText(marker.getSnippet());

        img.setImageBitmap (bmImg.get(Integer.parseInt(marker.getId().replaceAll("[^\\d.]", ""))-mIndex));

        return view;
    }

    @Override
    public View getInfoContents(Marker marker) {

         return null;
    }   

    // ... the rest of the code 
}
}

The key is to subtract the real location.size() from a locationDummy.size() to get a number int mIndex that you will subtract later on from marker.getId()