Question

我有一个需要解析的json文件，但标准的json解析器不起作用，我不知道为什么。也许我做错了什么，有人可以帮我解决这个问题吗？

这是解析器类：

public class GeoJSONDeserializer {

public static Route routeFromGeoJsonDictionary(JSONObject json)
{
    Route route = new Route();

    try {
        JSONArray features = json.getJSONArray("features");

        for (int i = 0; i < features.length(); i++) {
            JSONObject geometry = features.getJSONObject(i).getJSONObject("geometry");

            if (geometry.getString("type").equals("LineString"))
            {
                route.paths.add(routePathFromLineStringFeature(features.getJSONObject(i)));
            } else if (geometry.getString("type").equals("Point"))
            {
                route.pois.add(poiFromPointFeature(features.getJSONObject(i)));
            } else if (geometry.getString("type").equals("Polygon"))
            {
                route.paths.add(routeAnnotationFromPolygonFeature(features.getJSONObject(i)));
            }
        }

    } catch (Exception e)
    {}




    return route;
}

public static Path routePathFromLineStringFeature(JSONObject json)
{
    Path path = new Path();

    try {
        JSONObject geometry = json.getJSONObject("geometry");

        JSONArray lineStringCoordinates = geometry.getJSONArray("coordinates");

        for (int i = 0; i < lineStringCoordinates.length(); i++) {

            String coordinatePair = lineStringCoordinates.getString(i);

            String[] coords =
                    coordinatePair.substring(1, coordinatePair.length() - 2).split(",");

            double lat = Double.parseDouble(coords[0]);
            double lon = Double.parseDouble(coords[1]);

            LatLng point = new LatLng(lon, lat);

            path.coordinates.add(point);
        }


    } catch (Exception e)
    {}


    return path;
}


public static Path routeAnnotationFromPolygonFeature(JSONObject json)
{
    Path path = new Path();

    try {
        JSONObject geometry = json.getJSONObject("geometry");

        JSONArray lineStringCoordinates = json.getJSONArray("coordinates");

        for (int i = 0; i < lineStringCoordinates.length(); i++) {

            String coordinatePair;

            if (i >= lineStringCoordinates.length())
            {
                coordinatePair = lineStringCoordinates.getString(0);
            } else {
                coordinatePair = lineStringCoordinates.getString(i);
            }

            String[] coords =
                    coordinatePair.substring(1, coordinatePair.length() - 2).split(",");

            double lat = Double.parseDouble(coords[0]);
            double lon = Double.parseDouble(coords[1]);

            LatLng point = new LatLng(lon, lat);

            path.coordinates.add(point);
        }


    } catch (Exception e)
    {}


    return path;
}

public static POI poiFromPointFeature(JSONObject json)
{
    POI poi = new POI();

    try {
        JSONObject geometry = json.getJSONObject("geometry");
        Log.e("no parsed", geometry.toString());
        JSONObject properties = json.getJSONObject("properties");

        poi.title = properties.getString("name");
        poi.name = properties.getString("title");
        poi.subtitle = properties.getString("desc");

        try{
            JSONArray coordinates = geometry.getJSONArray("coordinates");
            poi.coordinates = new LatLng(coordinates.getDouble(1), coordinates.getDouble(0));
            Log.e("parsed", coordinates.toString());
        }catch (Exception e){
            Log.e("error", e.getMessage());
        }

    } catch (Exception e)
    {}

    return poi;
}}

然后这是我的日志输出：

link to the log file image

您可以看到一些未解析的字符串已被解析，而另一些则未解析。这不是一个随机问题，因为它总是发生在同一个问题上。

以下是json文件的链接：

Json file download

我希望有人可以帮我解决这个问题。

Answer 1

我必须使用optString而不是getString，因此解析器不会在尝试中崩溃

JSON解析android并不总是有用

1 个答案: