我在我的 android 应用程序中遇到地理定位问题

Question

我正在尝试使用 android studio 创建一个应用程序，我遇到了地理定位问题，特别是我正在尝试使用一个按钮来获取设备位置，但它不起作用。这是我正在使用的代码：

public void position(View view) {
        if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            fusedLocationProviderClient.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {

                public void onComplete(@NonNull Task<Location> task) {
                    Location location = task.getResult();
                    if (location != null) {

                        try {
                            Geocoder geocoder = new Geocoder(MainActivity.this, Locale.getDefault());
                            List<Address> addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
                            latitudine = addresses.get(0).getLatitude();
                            longitudine = addresses.get(0).getLongitude();
                            LatLng localizzazione = (new LatLng(latitudine, longitudine));
                            mMap.addMarker(new MarkerOptions().position(new LatLng(latitudine, longitudine)).icon(BitmapDescriptorFactory.fromResource(R.drawable.posizionegif)));
                            mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(localizzazione, 12));
                        } catch (IOException e) {
                            e.printStackTrace();
                        }

                    }

                }
            });

        } else {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 44);

        }

    }

希望你能帮助我。谢谢:)

Answer 1

看看这个活动。它完美地工作。只需在 Manifest 文件中添加以下权限

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

        public class LocationActivity extends AppCompatActivity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_location);
            getLocation();
        }

        String[] permissionList = new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION};

        @Override
        public void onResume() {
            super.onResume();
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                ActivityCompat.requestPermissions(this, permissionList, 101);
            } else {
                LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

                Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                if (location != null) {

                    Log.d("tisha==>>", "Latitude = " + location.getLatitude() + " Longitude= " + location.getLongitude());

                    Geocoder geocoder = new Geocoder(this);
                    try {
                        List<Address> addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 10);
                        if (addresses != null && !addresses.isEmpty()){
                            Address address = addresses.get(0);
                            Log.d("tisha==>>","Country Code= "+address.getCountryCode());
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

        private void getLocation() {
            LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, permissionList, 101);
            } else {
                Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                if (location != null) {
                    Log.d("tisha==>>", "Lat = " + location.getLatitude() + " Long= " + location.getLongitude());
                }
            }
        }

        @Override
        public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                               int[] grantResults) {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            if (requestCode == 101) {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                        Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            Log.d("tisha==>>", "Latitude = " + location.getLatitude() + " Longitude= " + location.getLongitude());
                        }
                    }
                }else {
                    ActivityCompat.requestPermissions(this, permissionList, 101);
                }
            }
        }
    }