Question

我想访问内部哈希图，所以我可以创建一个地理围栏，其中每个地理围栏都有一个自定义半径。

我已经在互联网上寻找了这个问题的答案，但是我似乎找不到任何看起来相似的代码，而其他有关如何访问嵌套Hashmap的文章也无济于事。

请提供任何帮助或建议。

我已经尝试了所有相关文章的内容，但是似乎没有任何效果。


private void setmGeofenceList(HashMap<String, Map.Entry<LatLng,Integer>> mhashMap)
    {
        for (Map.Entry<String, Map.Entry<LatLng,Integer>> entry : mhashMap.entrySet()) {

            mGeofenceList.add(new Geofence.Builder()
                    .setLoiteringDelay(1000)
                    .setNotificationResponsiveness(1000)
                    // Set the request ID of the geofence. This is a string to identify this
                    // geofence.
                    .setRequestId(entry.getKey())
                    // Set the circular region of this geofence.
                    .setCircularRegion(

                            //THIS is the problem, this wont access the LatLng Value that is inside the inner hashmap
                            entry.getValue().latitude, //error: cant access sysmbol Latitude

                            entry.getValue().longitude, //error: cant access sysmbol Longitude


                    )
                    // Set the expiration duration of the geofence. This geofence gets automatically
                    // removed after this period of time.
                    .setExpirationDuration(Geofence.NEVER_EXPIRE)

                    // Set the transition types of interest. Alerts are only generated for these
                    // transition. We track entry and exit transitions in this sample.
                    .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER |
                            Geofence.GEOFENCE_TRANSITION_EXIT)

                    // Create the geofence.
                    .build());

        }
    }

//这是Hashmap存储值的地方

    static final HashMap<String, Map.Entry<LatLng,Integer>>RED_LINE_GEOFENCES = new HashMap<>();
    static {
        RED_LINE_GEOFENCES.put("PlatformA", new AbstractMap.SimpleEntry<>(new LatLng(-33.905679, 19.112890), 300));
        RED_LINE_GEOFENCES.put("Ticket Office", new AbstractMap.SimpleEntry<>(new LatLng(-33.911024, 19.119688), 300));
        RED_LINE_GEOFENCES.put("Maison", new AbstractMap.SimpleEntry<>(new LatLng(-33.886851, 19.076072), 300));
        RED_LINE_GEOFENCES.put("Mont Rochelle", new AbstractMap.SimpleEntry<>(new LatLng(-33.914458, 19.106716), 300));
        RED_LINE_GEOFENCES.put("Holden Manz", new AbstractMap.SimpleEntry<>(new LatLng(-33.934360, 19.113939), 300));
        RED_LINE_GEOFENCES.put("Charmonix", new AbstractMap.SimpleEntry<>(new LatLng(-33.899535, 19.127489), 300));
        RED_LINE_GEOFENCES.put("DieuDonne", new AbstractMap.SimpleEntry<>(new LatLng(-33.891131, 19.133831), 300));
        RED_LINE_GEOFENCES.put("Grande Provance", new AbstractMap.SimpleEntry<>(new LatLng(-33.899443, 19.103134), 300));
        RED_LINE_GEOFENCES.put("Rickety Bridge", new AbstractMap.SimpleEntry<>(new LatLng(-33.894788, 19.097545), 300));
    }

Answer 1

link返回以LatLng为键的映射项。因此，要访问它们，您需要entry.getValue()和entry.getValue().getKey().latitude。

Answer 2

您缺少getKey（）调用。您需要这个；

 entry.getValue().getKey().latitude

Answer 3

代替

entry.getValue().latitude, //error: cant access symbol Latitude
entry.getValue().longitude, //error: cant access symbol Longitude

使用以下语句：

entry.getValue().get("latitude");
entry.getValue().get("longitude");

如何访问嵌套的Hashmap

3 个答案: