Android 无法添加多个圆和地图标记

我正在创建一个geofence应用程序，它有一个地图界面供用户查看geofence的位置。我遇到的问题是，每当我加载坐标时，它只会绘制一个圆和一个标记，但地理围栏可以按预期输入和输出。目前，我没有物理设备可供测试，所以我依赖于模拟器

private void loadGeofencesFromDatabase() {

    for (Map.Entry<String, LatLng> entry : Constants.BAY_AREA_LANDMARKS.entrySet()) {

        mGeofenceList.add(new Geofence.Builder()
                // 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(
                        entry.getValue().latitude,
                        entry.getValue().longitude,
                        Constants.GEOFENCE_RADIUS_IN_METERS
                )

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

                // 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());

        GeofenceLatLngCoordinates = new ArrayList<>();
        GeofenceLatLngCoordinates.add(new LatLng(entry.getValue().latitude, entry.getValue().longitude));

        GEOFENCE_RADIUS = Constants.GEOFENCE_RADIUS_IN_METERS;

        addGeofences();

    }
}

---

您正在创建

GeofenceLatLngCoordinates=new ArrayList（）for

循环时的code>

只需将该行移到

for

循环之前：

private void loadGeofencesFromDatabase() {
    GeofenceLatLngCoordinates = new ArrayList<>();
    GEOFENCE_RADIUS = Constants.GEOFENCE_RADIUS_IN_METERS;

    for (Map.Entry<String, LatLng> entry : Constants.BAY_AREA_LANDMARKS.entrySet()) {
        mGeofenceList.add(new Geofence.Builder()
                // 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(
                        entry.getValue().latitude,
                        entry.getValue().longitude,
                        Constants.GEOFENCE_RADIUS_IN_METERS
                )

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

                // 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());

        GeofenceLatLngCoordinates.add(new LatLng(entry.getValue().latitude, entry.getValue().longitude));
        addGeofences();
    }
}

private void loadgeofenssfromdatabase（）{
GeofenceLatLngCoordinates=新的ArrayList（）；
土工围栏半径=常数。土工围栏半径（单位：米）；
对于（Map.Entry:Constants.BAY\u AREA\u LANDMARKS.entrySet（））{
mGeofenceList.add（new geofinence.Builder（）
//设置地理围栏的请求ID。这是一个用于标识此项的字符串
//地球围栏。
.setRequestId（entry.getKey（））
//设置此地理围栏的圆形区域。
.setCircularRegion(
entry.getValue（）.latitude，
entry.getValue（）经度，
常数。土工围栏半径（单位：米）
)
//设置地理围栏的过期时间。此地理围栏将自动
//在这段时间后删除。
.setExpirationDuration（常数.geofense\u EXPIRATION\u以毫秒为单位）
//设置感兴趣的转换类型。仅为这些类型生成警报
//转换。我们在这个示例中跟踪进入和退出转换。
.setTransitionTypes（geofnce.geofnce\u TRANSITION\u输入|
土工围栏。土工围栏（过渡段和出口）
//创建地理围栏。
.build（））；
添加（新的LatLng（entry.getValue（）.latitude，entry.getValue（）.longitude））；
添加地理围栏（）；
}
}

private void loadGeofencesFromDatabase() {
    GeofenceLatLngCoordinates = new ArrayList<>();
    GEOFENCE_RADIUS = Constants.GEOFENCE_RADIUS_IN_METERS;

    for (Map.Entry<String, LatLng> entry : Constants.BAY_AREA_LANDMARKS.entrySet()) {
        mGeofenceList.add(new Geofence.Builder()
                // 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(
                        entry.getValue().latitude,
                        entry.getValue().longitude,
                        Constants.GEOFENCE_RADIUS_IN_METERS
                )

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

                // 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());

        GeofenceLatLngCoordinates.add(new LatLng(entry.getValue().latitude, entry.getValue().longitude));
        addGeofences();
    }
}