getLastKnownLocation 在 Android 7+ 版本中返回 Null

Question

我正在开发Android应用程序，我在其中获得了位置。下面的代码在Android 6.0之前工作正常，但在Android 7.0 +版本中，它在getLastKnownLocation给我空。

try {
            String country_name = null;
            LocationManager lm = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
            Geocoder geocoder = new Geocoder(getApplicationContext());
            for (String provider : lm.getAllProviders()) {
                @SuppressWarnings("ResourceType") Location location = lm.getLastKnownLocation(provider);
                if (location != null) {
                    try {
                        //,
                        List<Address> addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
                        if (addresses != null && addresses.size() > 0) {
                            country_name = addresses.get(0).getCountryName();
                            /*if(country_name.equalsIgnoreCase("India")||country_name.equalsIgnoreCase("Pakistan")){*/
                            if(country_name.equalsIgnoreCase("India")){
                                selectedIndia = true;
                            }else{
                                CheckRCRCSuggestion();
                            }
                            syncLocation(location);

                            break;
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    catch (Exception e){
                    }
                }
            }
        }catch (NullPointerException ne) {
            ne.printStackTrace();
        }catch (Exception ne) {
            ne.printStackTrace();
        }

Answer 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;
            if (isNetworkEnabled) {
                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("Network", "Network Enabled");
                if (locationManager != null) {
                    location = locationManager
                            .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }if (isGPSEnabled) {
                if (location == null) {
                    locationManager.requestLocationUpdates(
                            LocationManager.GPS_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("GPS", "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;
}