Picasso image loading issue in GoogleMap.InfoWindowAdapter

Question

I am using Google Maps Api and want to show an image inside InfoWindow when clicking of a Marker. I implemented it but there is a problem about Picasso. When I click a marke

Answer 1

I solved it. Actually, this post is the answer. But I want to explain how to do it and give more details to solve this problem in my situation.

When showing an InfoWindow, it is captured of the layout. It means that InfoWindows are not dynamic, they are just a picture, a snapshot. That's why, we have to refresh the InfoWindow after image loaded successfully. We can use Picasso's Callback to do it.

I changed my codes like below:

My new InfoWindowAdapter Class:

public class MapInfoWindowAdapter implements GoogleMap.InfoWindowAdapter {
    private final Hashtable<String, Boolean> markerSet;
    private Context context;
    private View myContentsView;

    public MapInfoWindowAdapter(Context context, Hashtable<String, Boolean> markerSet) {
        this.context = context;
        this.markerSet = markerSet;
    }

    @Override
    public View getInfoWindow(Marker marker) {
        return null;
    }

    @Override
    public View getInfoContents(Marker marker) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        myContentsView = inflater.inflate(R.layout.map_info_content, null);
        ImageView imageView = (ImageView) myContentsView.findViewById(R.id.imgView_map_info_content);
        boolean isImageLoaded = markerSet.get(marker.getId());
        if (isImageLoaded) {
            Picasso.with(context)
                    .load(marker.getSnippet())
                    .placeholder(R.drawable.ic_placeholder)
                    .into(imageView);
        } else {
            isImageLoaded = true;
            markerSet.put(marker.getId(), isImageLoaded);
            Picasso.with(context)
                    .load(marker.getSnippet())
                    .placeholder(R.drawable.ic_placeholder)
                    .into(imageView, new InfoWindowRefresher(marker));
        }

        return myContentsView;
    }
}

I passed to it a markers set, it holds marker ids and a boolean to determine image for that marker is loaded or not. I am checking this to select which Picasso code should run. If I don't do this, it will be recursion.

InfoWindowRefresher:

public class InfoWindowRefresher implements Callback {
    private Marker markerToRefresh;

    public InfoWindowRefresher(Marker markerToRefresh) {
        this.markerToRefresh = markerToRefresh;
    }

    @Override
    public void onSuccess() {
        markerToRefresh.showInfoWindow();
    }

    @Override
    public void onError() {}
}

Setting markers (using snippet to pass image url):

Hashtable<String, Boolean> markerSet = new Hashtable<>();
for (MediaFeedData item : mItemList) {
    LatLng position = new LatLng(item.getLocation().getLatitude(),
            item.getLocation().getLongitude());
    MarkerOptions markerOptions = new MarkerOptions()
            .snippet(item.getImages().getLowResolution().getImageUrl())
            .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_point))
            .position(position);
    Marker marker = mMap.addMarker(markerOptions);
    markerSet.put(marker.getId(), false);
}

mMap.setInfoWindowAdapter(new MapInfoWindowAdapter(this, markerSet));

Answer 2

What is working for me is this:

Inside getInfoWindow(Marker marker):

Picasso.with(getActivity())
                            .load(URL)
                            .error(R.drawable.my_loader)
                            .placeholder(R.drawable.my_loader)
                            .into(userPhoto, new MarkerCallback(marker,URL,userPhoto));

Then create a class:

public class MarkerCallback implements Callback {
Marker marker=null;
String URL;
ImageView userPhoto;


MarkerCallback(Marker marker, String URL, ImageView userPhoto) {
    this.marker=marker;
    this.URL = URL;
    this.userPhoto = userPhoto;
}

@Override
public void onError() {
    //Log.e(getClass().getSimpleName(), "Error loading thumbnail!");
}

@Override
public void onSuccess() {
    if (marker != null && marker.isInfoWindowShown()) {
        marker.hideInfoWindow();

        Picasso.with(getActivity())
                .load(URL)                        
                .into(userPhoto);

        marker.showInfoWindow();
    }
}

}