在GeoJson层之外的setOnFeatureClickListener上获取功能

Question

我正在尝试在setOnFeatureClickListener上获取geojson文件的功能。但是，当我在geojson文件外部或其附近单击时，我遇到了一个问题。我正在其他地方使用。请查看我的代码并向我提出一些建议，以便我可以解决此问题。

 private class AsyncGeoJsonLoader  extends  AsyncTask<Uri , Integer , GeoJsonLayer>{

        @Override
        protected GeoJsonLayer doInBackground(Uri... uris) {

            JSONObject jsonObject = null;

            try {
                jsonObject = new JSONObject(getStringFromFile(uris[0],getApplicationContext()));
            } catch (Exception e) {
                e.printStackTrace();
            }

            return new GeoJsonLayer(_googleMaps, jsonObject);
        }


        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            a = new ProgressDialog(MainActivity.this);
            a.setTitle("Loading File");

            File f = new File(GeoJSONFileURL);
            a.setMessage(f.getName());
            a.show();
        }

        @Override
        protected void onPostExecute(GeoJsonLayer layer) {
            super.onPostExecute(layer);
            a.dismiss();
            if (layer != null) {
                layer.addLayerToMap();
                layer.setOnFeatureClickListener(new GeoJsonLayer.OnFeatureClickListener() {  //Have a look over here.
                    @Override
                    public void onFeatureClick(Feature feature) {
                        String ID = "" ;
                        if (feature != null) {
                            ID = feature.getProperty("LINK_ID");

                            //Save LINK ID
                            LinkId_Helper.set_LinkID(ID);

                            if(ID != null)
                                alertBox("Are you sure want to mark your POI in this location ?" , ID);
                            else
                                Toast.makeText(getApplicationContext(),"ID is not available",Toast.LENGTH_SHORT).show();
                        }
                    }
                });
            }else{
                Toast.makeText(getApplicationContext(),"No Layer found in this file",Toast.LENGTH_SHORT).show();
            }

            Toast.makeText(getApplicationContext() , "Layout added to the Map" , Toast.LENGTH_SHORT).show();
        }
    }

Anyidea将为您带来极大的帮助，因为我在这里遇到障碍。感谢您的关注，