java - Android 应用位置与速度

Question

我正在制作一个 Android 应用程序，需要使用 GPS 来准确记录驾驶员统计数据，例如速度、航向、高度和经/纬度。

我需要每秒跟踪位置，但我似乎没有得到准确的结果。我试过市场上的 Android GPS 应用程序，它返回了正确的结果。

到目前为止我有这个。

    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Criteria criteria = new Criteria();
    provider =  locationManager.getBestProvider(criteria, false);
    Location location = locationManager.getLastKnownLocation(provider);
    VehicleListener vl = new VehicleListener();
    locationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, vl);

    if (location != null) {
        System.out.println("Provider " + provider + " has been selected.");
        lat =location.getLatitude();
        lon = location.getLongitude();
    }

Answer 1

您使用的是空条件。如果你想要更准确的尝试这个:

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
provider =  locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
VehicleListener vl = new VehicleListener();
locationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, vl);

if (location != null) {
    System.out.println("Provider " + provider + " has been selected.");
    lat =location.getLatitude();
    lon = location.getLongitude();
}