Android Google Maps GeoJsonLayer OnFeatureClickListener，多层 [英] Android Google Maps GeoJsonLayer OnFeatureClickListener, multiple layers

问题描述

请查看我的代码，以从geojson字符串创建图层，然后将图层添加到地图:

Please look at my code to create layer from geojson string and add layer to map:

private GeoJsonLayer createLayerFromGeojson(String json)
    {
        JSONObject ob = null;

        try
        {
            ob = new JSONObject(json);
        }
        catch (JSONException e)
        {
            e.printStackTrace();
        }

        GeoJsonLayer layer = new GeoJsonLayer(googleMap, ob);
        layer.addLayerToMap();

        layer.setOnFeatureClickListener(feature -> Utils.showMessage(getActivity(), "Clicked", feature.getProperty("description").toString()));

        return layer;
    }

接下来将2层添加到地图:

Next add 2 layers to map:

String json = /*first geojson string here*/
String json2 = /*another geojson string here*/

createLayerFromGeojson(json);
createLayerFromGeojson(json2);

问题:当我单击标记或pologon时，即使单击第一层从第一个json创建的对象，也始终显示从第二个json(json2)中获取的描述.

Problem: When I click on marker or pologon, always description taken from second json (json2) is displayed, even if I click on object created from first json, on first layer.

怎么了?有什么想法吗?

What's wrong? Any ideas?

推荐答案

如果您查看方法setOnFeatureClickListener的文档，则说明:

If you check the documentation for the method setOnFeatureClickListener it says:

为整个GoogleMap对象设置单次点击侦听器，当单击地图上的某个对象(多边形，标记，折线)时，它将与相应的Feature对象一起调用.

Sets a single click listener for the entire GoogleMap object, that will be called with the corresponding Feature object when an object on the map (Polygon, Marker, Polyline) is clicked.

对我来说，我们不能具有来自不同GeoJson的信息的多层结构似乎很愚蠢.它必须是MultiPolygon，MultiLineString或MultiPoint.

To me, it seems silly that we cannot have multiple layers with information from different GeoJson. It needs to be a MultiPolygon, MultiLineString or MultiPoint.

参考:> https://github.com/googlemaps/android-maps-utils/blob/master/library/src/com/google/maps/android/data/Layer.java#L89

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