在Java Android Google Map中显示和更新标记的图标

Question

I use the code from github(It's not my code) as an example https://github.com/mitchtabian/Google-Maps-2018/tree/displaying-trip-duration-of-polylines-end

This is my issue:

• Let's assume that there are some users (markers).
• I want to change the icon of marker to another picture from the internet, but it doesn't work.

I have two problems:

1. The onBeforeClusterItemRendered() method doesn't show the image. If I use the image from the resource as in the original example then it works.

2. The setUpdateMarker() method changes two images only on one marker instead of showing the image on each marker.

    @Override protected void onBeforeClusterItemRendered(ClusterMarker item, MarkerOptions markerOptions) { super.onBeforeClusterItemRendered(item, markerOptions); Bitmap mIcon = null ; try { InputStream in = new URL(item.getIconPath()).openStream(); mIcon = BitmapFactory.decodeStream(in); imageView.setImageBitmap(mIcon); Bitmap icon = iconGenerator.makeIcon(); markerOptions.icon( BitmapDescriptorFactory.fromBitmap(icon)).title(item.getTitle()); } catch (Exception e) { e.printStackTrace(); } } public void setUpdateMarker(ClusterMarker clusterMarker) { marker = getMarker(clusterMarker); if (marker != null) { marker.setPosition(clusterMarker.getPosition()); new DownloadImageTask().execute(clusterMarker.getIconPath()); } } private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> { @Override protected Bitmap doInBackground(String... urls) { Bitmap mIcon = null; try { InputStream in = new URL(urls[0]).openStream(); mIcon = BitmapFactory.decodeStream(in); } catch (Exception e) { e.printStackTrace(); } return mIcon; } @Override protected void onPostExecute(Bitmap result) { if (marker!=null && result != null) { Bitmap resizedBitmap = Bitmap.createScaledBitmap(result, markerWidth, markerHeight, false); marker.setIcon( BitmapDescriptorFactory.fromBitmap(resizedBitmap)); } } } 

Updated: I show the constructor of this class too:

public class MyClusterManagerRenderer extends DefaultClusterRenderer<ClusterMarker> {
    private static final String TAG = " ClusterManagerRenderer";
    private final IconGenerator iconGenerator;
    private final ImageView imageView;
    private final int markerWidth;
    private final int markerHeight;
    private final int padding;
    private Marker marker;


    public MyClusterManagerRenderer(Context context, GoogleMap googleMap,
                                    ClusterManager<ClusterMarker> clusterManager) {

        super(context, googleMap, clusterManager);

        // initialize cluster item icon generator
        iconGenerator = new IconGenerator(context.getApplicationContext());
        imageView = new ImageView(context.getApplicationContext());
        markerWidth = (int) context.getResources().getDimension(R.dimen.custom_marker_image);
        markerHeight = (int) context.getResources().getDimension(R.dimen.custom_marker_image);
        imageView.setLayoutParams(new ViewGroup.LayoutParams(markerWidth, markerHeight));
        padding = (int) context.getResources().getDimension(R.dimen.custom_marker_padding);
        imageView.setPadding(padding, padding, padding, padding);
        iconGenerator.setContentView(imageView);

    }

Answer 1

You can use your method in onClusterItemRendered() method. Take a look this answer https://stackoverflow.com/a/34029984/7917629

@Override
    protected void onClusterItemRendered(ClusterMarker item, final Marker marker) {
        String imageUrl = item.getImageUri();

        // here you can call your background task
        // or some other option like Glide
        // you put your icon as: 
        // marker.setIcon(BitmapDescriptorFactory.fromBitmap(resizedBitmap));
    }

------ Update how to use glide (my version 4.7.1) here

   @Override
    protected void onClusterItemRendered(EventMarker clusterItem, final Marker marker) {
        String imageUrl = clusterItem.getImageUri();

        if (imageView != null && imageUrl != null && !imageUrl.isEmpty()) {
            Glide.with(mContext.getApplicationContext())
                    .load(imageUrl)
                    .apply(new RequestOptions()
                            .optionalCircleCrop()
                            .placeholder(R.mipmap.default_event_cover_rounded)
                            .error(R.mipmap.default_event_cover_rounded)
                            .diskCacheStrategy(DiskCacheStrategy.ALL))
                    .into(new SimpleTarget<Drawable>() {
                        @Override
                        public void onResourceReady(@NonNull Drawable resource, @Nullable Transition<? super Drawable> transition) {
                            imageView.setImageDrawable(resource);
                            Bitmap icon = iconGenerator.makeIcon();
                            try {
                                marker.setIcon(BitmapDescriptorFactory.fromBitmap(icon));
                            } catch (Exception e) {
                                Log.d("TAG", "onResourceReady: " + e.getMessage());
                            }
                        }
                    });
        }
    }

This how you can update your icon after: Define some Map<String, Marker> markers in top of your CustomClusterRender, initialize it in constructor. add your marker with some key after you this marker.setIcon . Add like markers.put(clusterItem.getId(), marker); your custom cluster must have unique id. your method will be

public void updateMarker(final String id, String imgUrl) {
        if (markers.size() > 0) {
            if (iconImage != null) {
                Glide.with(mContext.getApplicationContext())
                        .load(imgUrl)
                        .apply(new RequestOptions()
                                .optionalCircleCrop()
                                .placeholder(R.mipmap.default_event_cover_rounded)
                                .error(R.mipmap.default_event_cover_rounded)
                                .diskCacheStrategy(DiskCacheStrategy.ALL))
                        .into(new SimpleTarget<Drawable>() {
                            @Override
                            public void onResourceReady(@NonNull Drawable resource, @Nullable Transition<? super Drawable> transition) {
                                iconImage.setImageDrawable(resource);
                                Bitmap icon = iconGenerator.makeIcon();
                                try {
                                    markers.get(id).setIcon(BitmapDescriptorFactory.fromBitmap(icon));
                                } catch (Exception e) {
                                    Log.d("TAG_SNAP", "onResourceReady: " + e.getMessage() + markers.get(id).getTitle());
                                }
                            }
                        });
            }
        }