Android Google Maps LocationManager 返回我两小时前所在的位置

Question

我正在开发一个应用程序，它在一个地方显示 map 并记录用户当前位置。

我的手机 ATM 上有这个应用程序。

两个小时前，我穿过市中心的公园。我一直启用移动网络，WiFi 已经禁用了几天，GPS 也禁用了。

回到离那个地方10公里的家。

启动应用程序，打开 map fragment ，最后一个已知位置似乎是我两小时前所在的那个公园的某个地方。

这是我的代码。

public static void setUpMapIfNeeded() {
        if (map == null) {
            mapFragment = (MapFragment) fragmentManager.findFragmentById(R.id.location_map);
            map = mapFragment.getMap();
            if (map != null) {
                setUpMap();
            }
        }
    }

    private static void setUpMap() {

        map.setMyLocationEnabled(false);
        map.setOnMapClickListener(new OnMapClickListener() {

            @Override
            public void onMapClick(LatLng latlng) {

                if (marker != null) {
                    marker.remove();
                }
                marker = map.addMarker(new MarkerOptions().position(latlng).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
                latitude = latlng.latitude;
                longitude = latlng.longitude;
                cachedLocation = addressFromLocation(latitude, longitude);
            }
        });

        Location myLocation = null;
        LocationManager manager = (LocationManager) a.getSystemService(Context.LOCATION_SERVICE);
        if (manager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
            myLocation = manager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            Log.d("NETWORK_PROVIDER", addressFromLocation(myLocation.getLatitude(), myLocation.getLongitude()));
        }
        if (myLocation == null) {
            myLocation = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            Log.d("GPS_PROVIDER", addressFromLocation(myLocation.getLatitude(), myLocation.getLongitude()));
        }

        if (myLocation != null) {
            map.clear();
            map.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(myLocation.getLatitude(), myLocation.getLongitude()), 15));
            if (marker != null) {
                marker.remove();
            }
            LatLng latlng = new LatLng(myLocation.getLatitude(), myLocation.getLongitude());
            marker = map.addMarker(new MarkerOptions().position(latlng).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
            latitude = myLocation.getLatitude();
            longitude = myLocation.getLongitude();
            cachedLocation = addressFromLocation(latitude, longitude);

        }

    } // End of setUpMap

addressFromLocation 是一个自定义方法，它返回一个字符串，其中包含获得的第一个地址行。

当我运行它时，日志中显示的行是:

Log.d("NETWORK_PROVIDER", addressFromLocation(myLocation.getLatitude(), myLocation.getLongitude()));

它返回两个小时前的位置。

有没有办法强制它检查位置？

Answer 1

需要咨询here
详情。这里总结了对您有帮助的部分。

为您的案例定义两个重要变量，如下所示(当然还需要其他变量)

// The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; //

public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
        isGPSEnabled = locationManager
                .isProviderEnabled(LocationManager.GPS_PROVIDER);

        // getting network status
        isNetworkEnabled = locationManager
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!isGPSEnabled && !isNetworkEnabled) {
            // no network provider is enabled
        } else {
            this.canGetLocation = true;
            // First get location from Network Provider
            if (isNetworkEnabled) {
                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("Network", "Network");
                if (locationManager != null) {
                    location = locationManager
                            .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }
            // if GPS Enabled get lat/long using GPS Services
            if (isGPSEnabled) {
                if (location == null) {
                    locationManager.requestLocationUpdates(
                            LocationManager.GPS_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("GPS Enabled", "GPS Enabled");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
            }
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return location;
}