Как мне получить доступ к текущему местоположению в onLocationChanged, в методе onMapReady?

Question

Я пытаюсь получить доступ к моему текущему местоположению в методе onLocationChanged, в методе onMapReady, но currentlatlng возвращает null. Любые рекомендации будут полезны.

Вот код:

public class MapActivity extends FragmentActivity implements OnMapReadyCallback, 
    GoogleApiClient.ConnectionCallbacks, 
    GoogleApiClient.OnConnectionFailedListener, 
    LocationListener,GoogleMap.OnInfoWindowClickListener { 

JSONArray jsonArray; 
String json_string; 
int _id; 
String _doctorname; 
String _doclat; 
String _doclong; 
public static LatLng currentlatLng = null; 
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99; 
LocationRequest mLocationRequest; 
GoogleApiClient mGoogleApiClient; 
private GoogleMap mMap; 

Location mLastLocation; 
Marker mCurrLocationMarker; 

Location _location; 
MarkerOptions _markeroption; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_map); 
    // int x =_st.jsonArray.length(); 
    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
     checkLocationPermission(); 
    } 

    // Obtain the SupportMapFragment and get notified when the map is ready to be used. 
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
      .findFragmentById(R.id.map); 
    mapFragment.getMapAsync(this); 

} 

@Override 
public void onMapReady(GoogleMap googleMap) { 
//Get Last Known Location and convert into Current Longitute and Latitude 
//  final LocationManager mlocManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); 
//  final Location currentGeoLocation = mlocManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 
// 
//  double currentLat = currentGeoLocation.getLatitude(); 
//  double currentLon = currentGeoLocation.getLongitude(); 
// 
//  LatLng currentLatLng = new LatLng(currentLat,currentLon); 
//Toast.makeText(this,"Cur Lat" +currentLat+"Lon"+currentLon,Toast.LENGTH_LONG).show(); 

    // Get JSON String and Break it down into individual nodes 
    //double x=_location.getLatitude(); 
    //double y=_location.getLongitude(); 
    json_string = getIntent().getExtras().getString("JSON_DTA"); 
    LatLng latLng = null; 
    try { 
     int count = 0; 
     //jsonObject = new JSONObject(json_string); 
     jsonArray = new JSONArray(json_string); 

     while (count < jsonArray.length()) { 
      JSONObject JO = jsonArray.getJSONObject(count); 
      _id = JO.getInt("id"); 
      _doctorname = JO.getString("doctorname"); 
      _doclat = JO.getString("latitude"); 
      _doclong = JO.getString("longitude"); 

      count++; 

      Double d = Double.parseDouble(_doclat); 
      Double e = Double.parseDouble(_doclong); 
      latLng = new LatLng(d, e); 

      DecimalFormat df = new DecimalFormat("####0.0"); 

      DistanceBetweenPoints distanceBetweenPoints = new DistanceBetweenPoints(); 
      // double distance = distanceBetweenPoints.CalculationByDistance(currentLatLng,latLng); 

      int distanceThreshHold = 7; 
      //if(distance < distanceThreshHold ) 
      { 
       mMap = googleMap; 
       MarkerOptions _markeroptions = new MarkerOptions() 
         .position(latLng) 
         .title(_doctorname + " KM") 
         .icon(BitmapDescriptorFactory.fromResource(R.drawable.gps)); 

       // mMap = googleMap; 
       mMap.addMarker(_markeroptions); 
       mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID); 
       mMap.setOnInfoWindowClickListener(this); 
      } 

    } 


    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 

    //Initialize Google Play Services 
    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
     if (ContextCompat.checkSelfPermission(this, 
       Manifest.permission.ACCESS_FINE_LOCATION) 
       == PackageManager.PERMISSION_GRANTED) { 
      buildGoogleApiClient(); 

      mMap.setMyLocationEnabled(true); 

     } 
    } else { 
     buildGoogleApiClient(); 
     mMap.setMyLocationEnabled(true); 
    } 
} 

protected synchronized void buildGoogleApiClient() { 
    mGoogleApiClient = new GoogleApiClient.Builder(this) 
      .addConnectionCallbacks(this) 
      .addOnConnectionFailedListener(this) 
      .addApi(LocationServices.API) 
      .build(); 
    mGoogleApiClient.connect(); 
} 
@Override 
public void onConnected(@Nullable Bundle bundle) { 

    mLocationRequest = new LocationRequest(); 

    mLocationRequest.setInterval(1000); 
    mLocationRequest.setFastestInterval(1000); 
    mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY); 
    if (ContextCompat.checkSelfPermission(this, 
      Manifest.permission.ACCESS_FINE_LOCATION) 
      == PackageManager.PERMISSION_GRANTED) { 
     LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this); 
    } 

} 

@Override 
public void onConnectionSuspended(int i) { 

} 


@Override 
public void onLocationChanged(Location location) { 

     mLastLocation = location; 
     if (mCurrLocationMarker != null) { 
      mCurrLocationMarker.remove(); 
     } 


     //Place current location marker 
     LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude()); 
     MarkerOptions markerOptions = new MarkerOptions(); 
     markerOptions.position(latLng); 
     markerOptions.title("Current Position"); 

     markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)); 
     mCurrLocationMarker = mMap.addMarker(markerOptions); 


     // Toast.makeText(this, "Current" + latLng, Toast.LENGTH_LONG).show(); 
     String tag = null; 
     Log.d(tag, "lon: " + location.getLongitude() + " ----- lat: " + location.getLatitude()); 


     //move map camera 
     mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 
     mMap.animateCamera(CameraUpdateFactory.zoomTo(11)); 


     //stop location updates 
     if (mGoogleApiClient != null) { 
      LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this); 
     } 


    } 




@Override 
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { 

} 

public boolean checkLocationPermission(){ 
    if (ContextCompat.checkSelfPermission(this, 
      Manifest.permission.ACCESS_FINE_LOCATION) 
      != PackageManager.PERMISSION_GRANTED) { 

     // Asking user if explanation is needed 
     if (ActivityCompat.shouldShowRequestPermissionRationale(this, 
       Manifest.permission.ACCESS_FINE_LOCATION)) { 

      // Show an expanation to the user *asynchronously* -- don't block 
      // this thread waiting for the user's response! After the user 
      // sees the explanation, try again to request the permission. 

      //Prompt the user once explanation has been shown 
      ActivityCompat.requestPermissions(this, 
        new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 
        MY_PERMISSIONS_REQUEST_LOCATION); 


     } else { 
      // No explanation needed, we can request the permission. 
      ActivityCompat.requestPermissions(this, 
        new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 
        MY_PERMISSIONS_REQUEST_LOCATION); 
     } 
     return false; 
    } else { 
     return true; 
    } 
} 
@Override 
public void onRequestPermissionsResult(int requestCode, 
             String permissions[], int[] grantResults) { 
    switch (requestCode) { 
     case MY_PERMISSIONS_REQUEST_LOCATION: { 
      // If request is cancelled, the result arrays are empty. 
      if (grantResults.length > 0 
        && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 

       // Permission was granted. 
       if (ContextCompat.checkSelfPermission(this, 
         Manifest.permission.ACCESS_FINE_LOCATION) 
         == PackageManager.PERMISSION_GRANTED) { 

        if (mGoogleApiClient == null) { 
         buildGoogleApiClient(); 
        } 
        mMap.setMyLocationEnabled(true); 
       } 

      } else { 

       // Permission denied, Disable the functionality that depends on this permission. 
       Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show(); 
      } 
      return; 
     } 

     // other 'case' lines to check for other permissions this app might request. 
     //You can add here other case statements according to your requirement. 
    } 
} 

@Override 
public void onInfoWindowClick(Marker marker) { 
    Intent intent = new Intent(MapActivity.this,DoctorAppointment.class); 

    startActivity(intent); 
} 

Может быть, мне не хватает что-то очень просто. Заранее спасибо.

Answer 1

использовать, как показано ниже, в OnLocationChanged.

location.getLatitude() 
location.getLongtitude() 

mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat_own, lng_own), 14));