java持续时间，时间返回nulldistancematrix.api

Question

我对如何使用 google 获取持续时间、时间和行进距离感到困惑 distancematrix.api 我不明白我的代码有什么问题，我得到的都是空值.为什么？？下面是我的 javacode

         DistanceMatrix results1 =  DistanceMatrixApi.getDistanceMatrix(context, 
                new String[] {"rose hill"}, new String[] {"port louis"}).units(Unit.METRIC).await();

    System.out.println(results1.rows[0].elements[0].duration);
    System.out.println(results1.rows[0].elements[0].distance);
    System.out.println(results1.rows[0].elements[0].distance);

请求的上下文

        GeoApiContext context = new GeoApiContext.Builder()
.apiKey("AIzaSyC..")
.build();

Answer 1

它对我有用，只需在 google 地图上创建（并启用）一个 API 键

这是我的代码

public class GoogleDistance {
    public static void main(String[] args) throws InterruptedException, ApiException, IOException {
        new GoogleDistance().go();
    }

    void go() throws InterruptedException, ApiException, IOException {
        String API_KEY = "AIzy....";
        GeoApiContext.Builder builder = new GeoApiContext.Builder();
        builder.apiKey(API_KEY);

        GeoApiContext geoApiContext = builder.build();
        DistanceMatrix results1 = DistanceMatrixApi.getDistanceMatrix(geoApiContext,
                new String[]{"rose hill"}, new String[]{"port louis"}).units(Unit.METRIC).await();
        System.out.println(Arrays.toString(results1.destinationAddresses));
    }
}

我认为问题可能出在您的打印件上：我认为您不应该这样做 rows[0].elements[0] 只需使用 Arrays.toString()。

当我运行我的代码输出 [Port Louis, Mauritius]

编辑

我想我现在明白你想做什么了。请看下面

public class GoogleDistance {
    public static void main(String[] args) throws InterruptedException, ApiException, IOException {
        new GoogleDistance().go();
    }

    void go() throws InterruptedException, ApiException, IOException {
        String API_KEY = "AIzy...";
        GeoApiContext.Builder builder = new GeoApiContext.Builder();
        builder.apiKey(API_KEY);

        GeoApiContext geoApiContext = builder.build();
        DistanceMatrix results1 = DistanceMatrixApi.getDistanceMatrix(geoApiContext,
                new String[]{"los angeles"}, new String[]{"san francisco"}).units(Unit.METRIC).await();


        DistanceMatrixRow[] rows = results1.rows;
        for (DistanceMatrixRow row : rows) {
            DistanceMatrixElement[] elements = row.elements;
            for (DistanceMatrixElement element : elements) {
                Distance distance = element.distance;
                if(distance == null){
                    System.out.println("distance is null");
                    continue;
                }
                String dist = distance.humanReadable;
                String dur = element.duration.humanReadable;
                System.out.println(dist);
                System.out.println(dur);
            }
        }

    }
}

我相信您得到的是空值，因为 google 无法在您提供的位置之间映射。

java持续时间，时间返回nulldistancematrix.api

java Duration, time returning null distancematrix.api

java

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google-distancematrix-api