java - 获取当前用户位置

Question

我正在尝试获取当前用户位置，但在某些设备上它可以工作，但在某些设备上我一直在等待位置。

这是我的代码:

private final LocationListener mLocationListener = new LocationListener() {
        @Override
        public void onLocationChanged(final Location location) {
            // TODO
            Log.v("--", "get address 121");
            Main.this.location = location;
            getAddress();
            locationManager.removeUpdates(mLocationListener);
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub
            Log.v("--", "provider enabled");
        }

        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub
            Log.v("--", "provider disabled");
        }
    };

    public void putExtra() {
        Intent intent = new Intent(this, Settings.class);
        intent.putExtra("timesobj", times);
        startActivity(intent);
    }

    /**
     * Get current/last known location and display city, country name and update
     * calculations
     * */
    public void getAddress() {
        Log.v("--", "get address 1");
        boolean isGPSProviderEnabled = locationManager
                .isProviderEnabled(LocationManager.GPS_PROVIDER);
        boolean network_enabled = locationManager
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        Log.v("--", "get address 31 " + isGPSProviderEnabled + " gps  -  "
                + isConnectedToNetwork());

        if (isGPSProviderEnabled || network_enabled) {
            Log.v("--", "get address 2");
            Criteria c = new Criteria();
            Log.v("--", "provider " + locationManager.getBestProvider(c, true));
            location = locationManager.getLastKnownLocation(locationManager
                    .getBestProvider(c, false));

            if (location == null) {
                Log.v("--", "get address 6");
                locationManager.requestLocationUpdates(
                        locationManager.getBestProvider(c, false), 1000, 100,
                        mLocationListener);
            } else {
                Log.v("--", "get address 3");
                if (isConnectedToNetwork()) {
                    new AsyncTask<Void, Void, Void>() {
                        protected Void doInBackground(Void... params) {
                            try {
                                com.myapp.utils.Geocoder geocoder = new com.myapp.utils.Geocoder(
                                        Main.this);
                                GeocoderModel geocoderModel = geocoder
                                        .getFromLocation(
                                                location.getLatitude(),
                                                location.getLongitude(), 5);
                                city = geocoderModel.getCity();
                                country = geocoderModel.getCountry();
                                prefs.edit().putString(Constants.CITY, city)
                                        .apply();
                                Log.v("--", "get address 4");
                            } catch (IOException e) {
                                Log.v("--", "get address 11");
                                e.printStackTrace();
                            } catch (LimitExceededException e) {
                                Log.v("--", "get address 12");
                                e.printStackTrace();
                            }
                            return null;
                        };

                        protected void onPostExecute(Void result) {
                            prefs.edit().putString(Constants.COUNTRY, country)
                                    .apply();
                            prefs.edit().putString(Constants.CITY, city)
                                    .apply();
                            populateList(location);
                        };
                    }.execute();
                } else {
                    city = prefs.getString(Constants.CITY,
                            getString(R.string.app_name));
                    Log.v("--", "get address 33 " + location.getLatitude());
                    populateList(location);
                }
            }
        } else {
            Log.v("--", "get address 5");
            startGpsEnableDialog();
        }
    }

这是我的日志:

V/--      ( 5498): get address 1
V/--      ( 5498): get address 31 true gps  -  true
V/--      ( 5498): get address 2
V/--      ( 5498): provider gp
V/--      ( 5498): get address 6

有人可以帮我看看这段代码中可能有什么问题，并告诉我如何正确获取用户位置吗？

谢谢!

Answer 1

尝试换行

locationManager.getBestProvider(c, false)

至

locationManager.getBestProvider(c, true)

如上所述here ，“enabledOnly - 如果为 true，则仅返回当前启用的提供程序”。您可能会找回未启用的提供程序。
另一件事，你似乎正在使用 Criteria，我通常不使用它，但从你的代码来看，你似乎没有用它做太多事情。我建议你再看一下。我找到了一个代码示例here这可能对你有帮助。

private void startLocationStuff(){
  locManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
  locListener=new MyLocationListener();
  final Criteria criteria=new Criteria();
  criteria.setAccuracy(Criteria.ACCURACY_FINE);
  criteria.setAltitudeRequired(false);
  criteria.setBearingRequired(false);
  criteria.setCostAllowed(true);
  criteria.setPowerRequirement(Criteria.POWER_LOW);
  bestProvider=locManager.getBestProvider(criteria,true);
}

您可能需要考虑使用位置管理器，而不使用 this 等条件。 .