Передача текущего местоположения маркеру

Question

Я пишу приложение, которое открывает приложение «Карты», и я хотел бы иметь возможность добавить объект Marker в текущее местоположение при его открытии. Мое приложение правильно открывает приложение «Карты» и показывает голубую точку для моего текущего местоположения, но мне трудно использовать это текущее местоположение, чтобы создать Marker.

Вот мой исходный код:

import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.GooglePlayServicesClient; 
import com.google.android.gms.common.GooglePlayServicesUtil; 
import com.google.android.gms.location.LocationClient; 
import com.google.android.gms.location.LocationListener; 
import com.google.android.gms.location.LocationRequest; 
import com.google.android.gms.maps.CameraUpdate; 
import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MarkerOptions; 
import com.google.android.gms.maps.MapFragment; 
import com.google.android.gms.maps.SupportMapFragment; 
import android.location.Location; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.provider.Settings; 
import android.app.Activity; 
import android.app.Dialog; 
import android.content.Intent; 
import android.support.v4.app.FragmentActivity; 
import android.util.Log; 
import android.widget.Toast; 

public class PlaceMarker extends FragmentActivity 
    implements GooglePlayServicesClient.ConnectionCallbacks, 
    GooglePlayServicesClient.OnConnectionFailedListener, 
    LocationListener { 
    private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000; 
    private LocationClient mLocationClient = null; 
    private LocationRequest mLocationRequest = null; 
    private GoogleMap mMap; 
    private static final int UPDATE_INTERVAL_IN_SECONDS = 5; 
    private static final int MILLISECONDS_PER_SECOND = 1000; 
    private static final long UPDATE_INTERVAL = MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS; 
    private static final int FASTEST_INTERVAL_IN_SECONDS = 1; 
    private static final long FASTEST_INTERVAL = MILLISECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS; 
    private LocationManager locationManager; 
    private Location location = null; 

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

     mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); 
     mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 
     mMap.setMyLocationEnabled(true); 

     mLocationClient = new LocationClient(this, this, this); 
     if (servicesConnected()) { 
      mLocationRequest = LocationRequest.create(); 
      mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); 
      mLocationRequest.setInterval(UPDATE_INTERVAL); 
      mLocationRequest.setFastestInterval(FASTEST_INTERVAL); 

      Double mLatitude = getCurrentLocation().getLatitude(); 
      Double mLongitude = getCurrentLocation().getLongitude(); 

      mMap.addMarker(new MarkerOptions() 
       .position(new LatLng(mLatitude, mLongitude)) 
       .title("Title Test") 
       .snippet("Snippet Test")); 
     } 
     else { 
      Toast.makeText(this, "Position unavailable", Toast.LENGTH_SHORT).show(); 
     } 
    } 

    @Override 
    protected void onStart() { 
     super.onStart(); 
     mLocationClient.connect(); 
    } 

    @Override 
    protected void onStop() { 
     if (mLocationClient.isConnected()) { 
      mLocationClient.removeLocationUpdates(this); 
     } 
     mLocationClient.disconnect(); 
     super.onStop(); 
    } 

    private Location getCurrentLocation() { 
     Location location = mLocationClient.getLastLocation(); 

     if (location != null) { 
      return location; 
     } 
     else { 
      Toast.makeText(this, "Current Location Unavailable", Toast.LENGTH_SHORT).show(); 
      checkforGPSAndPromptOpen(); 
      return null; 
     } 
    } 

    private void checkforGPSAndPromptOpen() { 
     boolean enabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER); 

     if (!enabled) { 
      Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
      startActivity(intent); 
     } 
    } 

    // Handle results returned to the FragmentActivity by Google Play services 
    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     // Decide what to do based on the original request code 
     switch (requestCode) { 
      case CONNECTION_FAILURE_RESOLUTION_REQUEST : 
      // If the result code is Activity.RESULT_OK, try to connect again 
       switch (resultCode) { 
        case Activity.RESULT_OK : 
        // Try the request again 
        break; 
       } 
      } 
    } 

    private boolean servicesConnected() { 
     // Check that Google Play services is available 
     int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this); 

     // If Google Play services is available 
     if (ConnectionResult.SUCCESS == resultCode) { 
      // In debug mode, log the status 
      Log.d("Location Updates", "Google Play services is available."); 
      // Continue 
      return true; 
     // Google Play services was not available for some reason 
     } else { 
      // Get the error code 
      // Get the error dialog from Google Play services 
      Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog(resultCode, this, CONNECTION_FAILURE_RESOLUTION_REQUEST); 

      // If Google Play services can provide an error dialog 
      if (errorDialog != null) { 
       errorDialog.show(); 
      } 
      return false; 
     } 
    } 

    /* 
    * Called by Location Services when the request to connect the client finishes successfully. 
    * At this point, you can request the current location or start periodic updates 
    */ 
    @Override 
    public void onConnected(Bundle dataBundle) { 
     // Display the connection status 
     Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show(); 
     mLocationClient.requestLocationUpdates(mLocationRequest, this); 
     location = getCurrentLocation(); 
     takeToLocation(convertLocationtoLatLong(location)); 
    } 

    /* 
    * Called by Location Services if the connection to the location client drops because of an error. 
    */ 
    @Override 
    public void onDisconnected() { 
     // Display the connection status 
     Toast.makeText(this, "Disconnected. Please re-connect.", Toast.LENGTH_SHORT).show(); 
    } 

    public void onLocationChanged(Location location) { 
     // Report to the UI that the location was updated 
//  String msg = "Updated location: " + Double.toString(location.getLatitude()) + "," + Double.toString(location.getLongitude()); 
//  Toast.makeText(this, msg, Toast.LENGTH_SHORT).show(); 
    } 

    /* 
    * Called by Location Services if the attempt to Location Services fails. 
    */ 
    @Override 
    public void onConnectionFailed(ConnectionResult connectionResult) { 

    } 

    private void takeToLocation(LatLng newLocation) { 
     if (newLocation != null) { 
      CameraUpdate update = CameraUpdateFactory.newLatLngZoom(newLocation, 16); 
      mMap.animateCamera(update); 
     } 
     else { 
      Toast.makeText(this, "Position unavailable", Toast.LENGTH_SHORT).show(); 
     } 
    } 
    private LatLng convertLocationtoLatLong(Location location) { 
     LatLng currentLatLong = new LatLng(location.getLatitude(), location.getLongitude()); 
     return currentLatLong; 
    } 
} 

Ошибка LogCat показывает, что существует IllegalStateException: Not connected вызвана линией 61:

Double mLatitude = getCurrentLocation().getLatitude(); 

Answer 1

Я думаю, если у вас есть какая-то авария третьей стороны, ловя SDK используется в вашем проекте, то, если getCurrentLocation() возвращает значение null в следующих строках:

Double mLatitude = getCurrentLocation().getLatitude(); 
    Double mLongitude = getCurrentLocation().getLongitude(); 

может случиться так, что SDK ловит NPE, но не отправляет отчет. Потому что ваш метод getCurrentLocation() может вернуть нуль:

Toast.makeText(this, "Current Location Unavailable", Toast.LENGTH_SHORT).show(); 
    checkforGPSAndPromptOpen(); 
    return null; 

Answer 2

Глядя на мою ошибку LogCat, я, казалось, забыли предложение:

Not connected. Call connect() and wait for onConnected() to be called. 

Так как это, где мой LocationClient запрашивает обновление местоположения и получает мое текущее местоположение, я переместил свои инициалы широты и долготы, а также мой код addMarker() в этом методе.

public void onConnected(Bundle dataBundle) { 
     // Display the connection status 
     Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show(); 
     mLocationClient.requestLocationUpdates(mLocationRequest, this); 
     location = getCurrentLocation(); 
     takeToLocation(convertLocationtoLatLong(location)); 

     Double mLatitude = getCurrentLocation().getLatitude(); 
     Double mLongitude = getCurrentLocation().getLongitude(); 

     mMap.addMarker(new MarkerOptions() 
      .position(new LatLng(mLatitude, mLongitude)) 
      .title("Title Test") 
      .snippet("Snippet Test")); 
    }