android - 当前位置始终为空

Question

我正在尝试使用 gps 或网络在编辑框中单击按钮来检索我的当前位置..我已经尝试了我在教程和旧帖子中找到的所有可能方法....但我的位置始终为空..我没有得到我错的地方。？我正在有网络但没有互联网/gprs 的真实设备上测试它...

这是我正在使用的代码..我也对 GPS_PROVIDER 进行了同样的尝试..请帮助我..

     protected void showCurrentLocation() 
   {
     geocoder = new Geocoder(this); 
     locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
     locationManager.requestLocationUpdates(
                LocationManager.NETWORK_PROVIDER, 
                MINIMUM_TIME_BETWEEN_UPDATES, 
                MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
                new MyLocationListener()
        );

   Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
   System.out.println("loc.."+location);
   if (location != null) 
   {
   String message = String.format("Location \n Longitude: %1$s \n Latitude: %2$s",
                location.getLongitude(), location.getLatitude());
       Toast.makeText(ShowActivity.this, message,
               Toast.LENGTH_LONG).show();
  //acTextView.setText(message);
   try {
          List<Address> addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 10); //<10>
          for (Address address : addresses) {
              System.out.println("my location .."+address.getAddressLine(0));
            acTextView.setText(address.getAddressLine(0));
          }



        } catch (IOException e) {
          Log.e("LocateMe", "Could not get Geocoder data", e);
        }
    }
    else
    {
    AlertDialog.Builder alertbox1 = new AlertDialog.Builder(this);
    alertbox1.setMessage("No GPS or network ..Signal please fill the location manually!");
    alertbox1.setNeutralButton("Ok", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface arg0, int arg1) 
    {}});
    alertbox1.show();
    }

}   

我只是在编辑问题而不是问新问题..因为我的问题仍然与同一个问题有关...我没有更改代码中的任何内容，现在工作得很好......但问题是当我使用 GPS_PROVIDER 时，它返回准确的地址以及经度和纬度的值..但是当我使用 NETWORK_PROVIDER 时它只返回经度和纬度的值没有地址...我想检索完整的使用 NETWORK_PROVIDER 地址，因为 GPS 在室内不工作......我该怎么做？

谢谢...!!

Answer 1

请检查您的 list 文件。您是否添加了这些权限。

 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>

查看更新后的答案:

protected void showCurrentLocation() 
       {
         geocoder = new Geocoder(this); 
         locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
         locationManager.requestLocationUpdates(
                    LocationManager.NETWORK_PROVIDER, 
                    MINIMUM_TIME_BETWEEN_UPDATES, 
                    MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
                    myLocationListener
            );
         timer = new Timer();
         timer.schedule(new GetLastLocation(),20000);

       }

     class GetLastLocation extends TimerTask {

            @Override
            public void run() {
                timer.cancel();
                locationManager.removeUpdates(locationListener);
                 Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                   System.out.println("loc.."+location);
                   if (location != null) 
                   {
                   String message = String.format("Location \n Longitude: %1$s \n Latitude: %2$s",
                                location.getLongitude(), location.getLatitude());
                       Toast.makeText(ShowActivity.this, message,
                               Toast.LENGTH_LONG).show();
                  //acTextView.setText(message);
                   try {
                          List<Address> addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 10); //<10>
                          for (Address address : addresses) {
                              System.out.println("my location .."+address.getAddressLine(0));
                            acTextView.setText(address.getAddressLine(0));
                          }



                        } catch (IOException e) {
                          Log.e("LocateMe", "Could not get Geocoder data", e);
                        }
                    }
                    else
                    {
                    AlertDialog.Builder alertbox1 = new AlertDialog.Builder(this);
                    alertbox1.setMessage("No GPS or network ..Signal please fill the location manually!");
                    alertbox1.setNeutralButton("Ok", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface arg0, int arg1) 
                    {}});
                    alertbox1.show();
                    }
                }   
                return;
            }
        }

     /** The location listener. */
        LocationListener myLocationListener = new LocationListener() {

            public void onLocationChanged(Location location) {

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