我在Android
Studio中，并且有一个包含两个标记的地图片段（com.google.android.gms.maps.SupportMapFragment）。一种是静态的，称为目标。另一个跟踪我的动作，称为“猎人”。它有效，但问题是猎人标记四处徘徊。我将更新间隔设置为15毫秒，但是以步行速度，每个块仅更新一次。

因此，如何正确添加标记来跟踪我的位置并使其具有合理的准确性并实时更新？还是我在这里做错了什么？

格雷格

onCreate（）

    setUpMapIfNeeded();

    if (mMap != null) {
        LatLng Target = new LatLng(TargetLat, TargetLong);
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(Target, 15));
    }


    LocationManager locationManager = (LocationManager) this.getSystemService(this.LOCATION_SERVICE);

    LocationListener locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            makeUseOfNewLocation(location);
        }

        public void onStatusChanged(String provider, int status, Bundle extras) {}

        public void onProviderEnabled(String provider) {
            registerForUpdates();
        }

        public void onProviderDisabled(String provider) {
            deregisterForUpdates();
        }
    };

    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);


private void registerForUpdates() {
    _locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, GPS_FREQUENCY_MILLIS, 0, _locationListener);
}

位置更改时更新标记。当我们接近目标时，振动并更改文字。

    private void makeUseOfNewLocation(Location loc) {
    HunterLat = loc.getLatitude();
    HunterLong = loc.getLongitude();

    if (Hunter != null) {
        LatLng NewLoc = new LatLng(HunterLat, HunterLong);
        Hunter.setPosition(NewLoc);

        TextView txtItem = (TextView) findViewById(R.id.ItemName);

        if (HunterLong > TargetLong - .0007 && HunterLong < TargetLong + .0007 && HunterLat > TargetLat - .0007 && HunterLat < TargetLat + .0007) {
            txtItem.setTextColor(Color.MAGENTA);
            txtItem.setText(ItemName);
            if (!Vibrated){
                Vibrated = true;
                Vibrator v = (Vibrator) this.getSystemService(Context.VIBRATOR_SERVICE);
                v.vibrate(500);
            }
        }
        else {
            txtItem.setTextColor(Color.BLACK);
            txtItem.setText(getResources().getString(R.string.hunt_item));
        }
    }
    else {
        Hunter = mMap.addMarker(new MarkerOptions().position(new LatLng(HunterLat, HunterLong)).title("You"));
        BitmapDescriptor icon2 = BitmapDescriptorFactory.fromResource(R.drawable.ic_map_person);
        Hunter.setIcon(icon2);

    }
}

设置地图并添加静态目标标记

   private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();
        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            setUpMap();
        }
    }
}

private void setUpMap() {
    Marker Target = mMap.addMarker(new MarkerOptions().position(new LatLng(TargetLat, TargetLong)).title(Location));
    BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.drawable.ic_target);
    Target.setIcon(icon);
}