java - 我有以下 JSON，如何将其捕捉到 Road Android Google Maps

Question

以下 Json 有道路附近地方的经度和纬度..我希望这些线能够捕捉到道路...但我尝试过但失败了..只是想在道路上绘制折线，以便计算从一条道路 LatLang 到另一条道路的距离。

 {
    snappedPoints: [
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    longitude: 149.129531998742
    },
    originalIndex: 0,
    placeId: "ChIJr_xl0GdNFmsRsUtUbW7qABM"
    },
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    location: {
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    longitude: 149.12946589999999
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    placeId: "ChIJr_xl0GdNFmsRsUtUbW7qABM"
    },
    {
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    latitude: -35.2784195,
    longitude: 149.12946589999999
    },
    placeId: "ChIJ6aXGemhNFmsRZE_zHqhmrG4"
    },
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    longitude: 149.12933809999998
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    placeId: "ChIJ6aXGemhNFmsRZE_zHqhmrG4"
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    longitude: 149.12933809999998
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    placeId: "ChIJTcTdZ2hNFmsRXokM4mWCWfk"
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    longitude: 149.1292973
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    longitude: 149.1292889
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    placeId: "ChIJtWxAZmpNFmsRlbUCkc6VtnA"
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    ]
    }

Answer 1

最好在您的问题中提供更多细节。我们不知道您已经尝试过什么。我还没有使用过 Android 版谷歌地图，但考虑到它的使用和记录都很好，所以应该不会那么困难。

在 Google Dev 网站上快速搜索后，我会将您的 json 转换为更有用的内容，例如数组或对象，甚至是纬度/经度的键值对。

然后，您需要向 Google map 对象添加折线，以“绘制”每个坐标之间的线条。

// Instantiates a new Polyline object and adds points to define route
PolylineOptions rectOptions = new PolylineOptions()
        .add(new LatLng(37.35, -122.0))
        .add(new LatLng(37.45, -122.0))  
        .add(new LatLng(37.45, -122.2))  
        .add(new LatLng(37.35, -122.2))  
        .add(new LatLng(37.35, -122.0)); 

// Get back the mutable Polyline
Polyline polyline = myMap.addPolyline(rectOptions);

取自 https://developers.google.com/maps/documentation/android-api/shapes

还有一个 GeoJSON 实用程序，可将地理位置点的 JSONObject 直接转换为 map 。 https://developers.google.com/maps/documentation/android-api/utility/geojson

有很多关于谷歌地图的教程，不用介意谷歌自己的文档。

祝你好运