在按钮点击时获取Android位置

Question

我试图在按钮点击时获取位置。我编写了LocationListener方法，一切都运行良好。这是我的源代码:

private class MyLocationListener implements LocationListener {

    @Override
    public void onLocationChanged(Location loc) {
        editLocation.setText("");
        pb.setVisibility(View.INVISIBLE);
        Toast.makeText(
                getBaseContext(),
                "Location changed: Lat: " + loc.getLatitude() + " Lng: "
                    + loc.getLongitude(), Toast.LENGTH_SHORT).show();
        String longitude = "Longitude: " + loc.getLongitude();
        Log.v(TAG, longitude);
        String latitude = "Latitude: " + loc.getLatitude();
        Log.v(TAG, latitude);

        /*------- To get city name from coordinates -------- */
        String cityName = null;
        Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
        List<Address> addresses;
        try {
            addresses = gcd.getFromLocation(loc.getLatitude(),
                    loc.getLongitude(), 1);
            if (addresses.size() > 0) {
                System.out.println(addresses.get(0).getLocality());
                cityName = addresses.get(0).getLocality();
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        String s = longitude + "\n" + latitude + "\n\nMy Current City is: "
            + cityName;
        editLocation.setText(s);
    }

    @Override
    public void onProviderDisabled(String provider) {}

    @Override
    public void onProviderEnabled(String provider) {}

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

我可以使用 LocationListener 来检查纬度和经度，但是我如何在按钮单击时获取当前位置？

- BekaKK

---

你可以将纬度和经度设为全局变量，这样你就可以在任何其他函数中使用它们。 - rafsanahmad007

如何？@rafsanahmad007 - BekaKK

最好的方法是使用回调函数，在获取位置时通知您；有时您不能仅仅期望在需要时立即获得它 - 就像从快餐店订购一样。 - Eenvincible

Answer 1

你正在从LocationManager::getLastKnownLocation()获取它

LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

- azizbekian

Answer 2

这是我的代码，它适用于我的应用程序。您可以尝试使用它来获取位置。

 ro_gps_icon.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
            if (ActivityCompat.checkSelfPermission(RODetailsActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(RODetailsActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                return;
            }           locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30000, 0, (LocationListener) RODetailsActivity.this);
            Criteria criteria = new Criteria();
            String bestProvider = locationManager.getBestProvider(criteria, true);
            Location location = locationManager.getLastKnownLocation(bestProvider);

            if (location == null) {
                Toast.makeText(getApplicationContext(), "GPS signal not found", Toast.LENGTH_SHORT).show();
            }
            if (location != null) {
                Log.e("locatin", "location--" + location);

                Log.e("latitude at beginning",
                        "@@@@@@@@@@@@@@@" + location.getLatitude());
                onLocationChanged(location);
            }
        }
    });

获取数据的方法。

public void onLocationChanged(Location location) {
    Geocoder geocoder;
    List<Address> addresses;
    geocoder = new Geocoder(this, Locale.getDefault());

    double latitude = location.getLatitude();
    double longitude = location.getLongitude();

    Log.e("latitude", "latitude--" + latitude);
    try {
        Log.e("latitude", "inside latitude--" + latitude);
        addresses = geocoder.getFromLocation(latitude, longitude, 1);
        if (addresses != null && addresses.size() > 0) {
            String address = addresses.get(0).getAddressLine(0);
            String city = addresses.get(0).getLocality();
            String state = addresses.get(0).getAdminArea();
            String country = addresses.get(0).getCountryName();
            String postalCode = addresses.get(0).getPostalCode();
            String knownName = addresses.get(0).getFeatureName();

            ro_gps_location.setText(state + " , " + city + " , " + country);
            ro_address.setText(address + " , " + knownName + " , " + postalCode);
        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

- Vishal Gedia