Codenameone 谷歌地图

Question

我有一个谷歌地图。在模拟器中，一切正常，但在 android 设备中永远找不到当前位置（显示消息位置错误 - 请参阅代码）。地图以世界视图打开...

cnt = new MapContainer(new GoogleMapsProvider(""));
cnt.setMapType(MAP_TYPE_TERRAIN);

LocationManager locationManager = LocationManager.getLocationManager();

InfiniteProgress ip = new InfiniteProgress();
Dialog ipDlg = ip.showInifiniteBlocking();
Location loc = LocationManager.getLocationManager().getCurrentLocationSync(30000);
ipDlg.dispose();
if (loc == null) {
    try {
        loc = LocationManager.getLocationManager().getCurrentLocation();
    } catch (IOException err) {
        Dialog.show("Location Error", "Unable to find your current location, please be sure that your GPS is turned on", "OK", null);
        return;
    }
}
locationManager.setLocationListener(this);

if (loc != null) {
    double lat = loc.getLatitude();
    double lng = loc.getLongitude();
    Coord coordinate = new Coord(lat, lng);
}

设备上的 GPS 处于活动状态。 我可以在其他应用中查看我的位置。

Answer 1

如果特定区域的 GPS 接收不佳，您可以通过回退到一些默认位置来改进您的代码：

cnt = new MapContainer(new GoogleMapsProvider(""));
cnt.setMapType(MAP_TYPE_TERRAIN);

LocationManager locationManager = LocationManager.getLocationManager();
Location loc = locationManager.getLastKnownLocation(); //default
if (locationManager.isGPSDetectionSupported()) {
    if (locationManager.isGPSEnabled()) {
        InfiniteProgress ip = new InfiniteProgress();
        Dialog ipDlg = ip.showInifiniteBlocking();
        Location loc2 = locationManager.getCurrentLocationSync(30000);
        if (loc2 != null) {
            loc = loc2;
        }
    } else {
        Dialog.show("Location Error", "Unable to find your current location, please be sure that your GPS is turned on", "OK", null);
    }
} else {
    InfiniteProgress ip = new InfiniteProgress();
    Dialog ipDlg = ip.showInifiniteBlocking();
    Location loc2 = locationManager.getCurrentLocationSync(30000);
    if (loc2 != null) {
        loc = loc2;
    } else {
        loc = LocationManager.getLocationManager().getCurrentLocation();
    }
}
if (loc != null) {
    double lat = loc.getLatitude();
    double lng = loc.getLongitude();
    Coord coordinate = new Coord(lat, lng);
}