java - 如何显示位置权限设置

Question

如何显示带有允许和拒绝按钮的位置权限弹出窗口？

我有接收位置的功能，但现在我需要自己去设置并打开位置。

我希望当用户打开 fragment 时，显示弹出的位置。

这是我目前拥有的代码:

LocationFinder 类:

public class LocationFinder extends Service implements LocationListener {

    Context context;

    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 200 * 10 * 1; // 2 seconds

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public LocationFinder(Context context) {
        this.context = context;
        getLocation();
    }

    @Override
    public void onLocationChanged(Location location) {

    }

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

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @SuppressLint("MissingPermission")
    public Location getLocation() {
        try {
            locationManager = (LocationManager) context
                    .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
                // Log.e("Network-GPS", "Disable");
            } else {
                this.canGetLocation = true;
                // First get location from Network Provider
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    // Log.e("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                } else
                    // if GPS Enabled get lat/long using GPS Services
                    if (isGPSEnabled) {
                        if (location == null) {
                            locationManager.requestLocationUpdates(
                                    LocationManager.GPS_PROVIDER,
                                    MIN_TIME_BW_UPDATES,
                                    MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                            //Log.e("GPS Enabled", "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;
    }

    public double getLatitude() {
        if (location != null) {
            latitude = location.getLatitude();
        }
        return latitude;
    }

    public double getLongitude() {
        if (location != null) {
            longitude = location.getLongitude();
        }
        return longitude;
    }

    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    public void showSettingsAlert() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);
        alertDialog.setTitle("GPS settings");
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                context.startActivity(intent);
            }
        });

        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        alertDialog.show();
    }

}

显示位置的 fragment :

public class GarageFragment extends Fragment {

    LocationFinder finder;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_garage, container, false);
        getLocation();
        return view;


    }

    public void getLocation() {
        double longitude = 0.0;
        double latitude = 0.0;
        finder = new LocationFinder(getContext());
        if (finder.canGetLocation()) {
            latitude = finder.getLatitude();
            longitude = finder.getLongitude();
//            Toast.makeText(getActivity(), "lat-lng " + latitude + "--" + longitude, Toast.LENGTH_LONG).show();

        } else {
            finder.showSettingsAlert();
        }
        Geocoder gcd = new Geocoder(getContext(), Locale.getDefault());
        List<Address> addresses = null;
        try {
            addresses = gcd.getFromLocation(latitude, longitude, 1);
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (addresses.size() > 0) {
            Toast.makeText(getActivity(), addresses.get(0).getLocality(), Toast.LENGTH_LONG).show();

        } else {
            // do your stuff
        }
    }
}

Answer 1

添加此代码以检查您的权限

  if (ContextCompat.checkSelfPermission(Activity.this, ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ||
                ContextCompat.checkSelfPermission(SplashActivity.this, ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            String[] PERMISSIONS = {    ACCESS_FINE_LOCATION, ACCESS_COARSE_LOCATION};
            ActivityCompat.requestPermissions(Activity.this, PERMISSIONS, 600);
        } else {
            // your code
        }

添加您的 resultActivity

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    Log.v("requestCode", "requestCode=" + requestCode);
    switch (requestCode) {
        case 600:
            if (ActivityCompat.checkSelfPermission(this, permissions[0]) == PackageManager.PERMISSION_GRANTED
                    || ActivityCompat.checkSelfPermission(this, permissions[1]) == PackageManager.PERMISSION_GRANTED) {
                //allowed

            } else {
                //set to never ask again
                ActivityCompat.requestPermissions(SplashActivity.this, new String[]{ACCESS_FINE_LOCATION, ACCESS_COARSE_LOCATION}, 700);
            }
            break;

        case 700:
            if (ActivityCompat.checkSelfPermission(this, permissions[0]) == PackageManager.PERMISSION_GRANTED
                    || ActivityCompat.checkSelfPermission(this, permissions[1]) == PackageManager.PERMISSION_GRANTED) {
                //allowed

            } else {
                //set to never ask again
                ActivityCompat.requestPermissions(SplashActivity.this, new String[]{ACCESS_FINE_LOCATION, ACCESS_COARSE_LOCATION}, 700);
            }
            break;
    }
}