使用querySourceFeature获取图层功能 [英] Getting layer features with querySourceFeature

问题描述

我正在尝试从Mapbox样式层获取所有功能.我找到了querySourceFeature()方法.但是，我无法获得确切的消息来源.这里是Mapbox文档中的简单代码块.

I'm trying to get all features from Mapbox style layer. I found querySourceFeature() method. However, I cannot get exact source. Here simple code block from Mapbox documentation.

我不使用GeoJsonSource进行样式设置，我的意思是我不添加任何GeoJsonSouce.因此，"source"变量返回"null"，我不知道应该用什么代替GeoJsonSource和"population-source".

I don't use GeoJsonSource for styling, I mean I dont add any GeoJsonSouce. So, "source" variable returns "null" and I did not understand what should come instead of GeoJsonSource and "population-source".

GeoJsonSource source = style.getSourceAs("population-source");
List<Feature> features = source.querySourceFeatures(Expression.get("population"));

总而言之，我想从Mapbox样式中获取所有功能.

To sum up, I want to get all features in one layer from Mapbox style.

推荐答案

为了获取样式层作为源，我们应该使用VectorSource().

In order to get style layer as source, we should use VectorSource().

VectorSource source = style.getSourceAs("composite");

"composite"是"style.json"中图层的源变量.

"composite" is layer' source variable in "style.json".

对于querySourceFeatures()，我们应该给出layerSource(String[])和Expression.

For querySourceFeatures(), we should give layerSource(String[]) and Expression.

List<Feature> all_features = source.querySourceFeatures(source_layers,Expression);

"source_layers"是"style.json"中图层的源层变量.

"source_layers" is layer' source-layer variable in "style.json".

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