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private class ClusterTask extends AsyncTask<Float, Void, Set<? extends Cluster<T>>> {
    @Override
    protected Set<? extends Cluster<T>> doInBackground(Float... zoom) {
        mAlgorithmLock.readLock().lock();
        try {
            return mAlgorithm.getClusters(zoom[0]);
        } finally {
            mAlgorithmLock.readLock().unlock();
        }
    }

    @Override
    protected void onPostExecute(Set<? extends Cluster<T>> clusters) {
        mRenderer.onClustersChanged(clusters);
        if(listener!=null){//我在这里自定义回调，但是获取聚合点个数为0
            listener.onClustersChanged();
        }
    }
}