polyligne non visible dans google maps

Question

J'essaye d'ajouter une polyligne reliant un groupe de points dans google maps.When je construis l'application je ne reçois aucune erreur mais polyline n'apparaît pas. Si j'appelle la méthode d'isvisible() elle renvoie true.Please Aide

@Override 
public void onMapReady(GoogleMap googleMap) { 
    // new LongOperation().execute(""); 

    /* googleMap.setMapStyle(
      MapStyleOptions.loadRawResourceStyle(
        this, R.raw.mapjson));*/ 

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
     // TODO: Consider calling 
     // ActivityCompat#requestPermissions 
     // here to request the missing permissions, and then overriding 
     // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
     //           int[] grantResults) 
     // to handle the case where the user grants the permission. See the documentation 
     // for ActivityCompat#requestPermissions for more details. 
     return; 
    } 
    googleMap.setMyLocationEnabled(true); 
    googleMapnew = googleMap; 
    Polyline polyline1 = googleMap.addPolyline(new PolylineOptions() 
      .clickable(true) 
      .add(
        new LatLng(13.034063, 77.567006), 
        new LatLng(13.034087, 77.568629), 
        new LatLng(13.034202, 77.569431), 
        new LatLng(13.034371, 77.570103), 
        new LatLng(13.034535, 77.570121), 
        new LatLng(13.036526, 77.570489), 
        new LatLng(13.037719, 77.570545), 
        new LatLng(13.038252, 77.570039), 
        new LatLng(13.039849, 77.570028), 
        new LatLng(13.040153, 77.569229), 
        new LatLng(13.040640, 77.568512), 
        new LatLng(13.041071, 77.567996), 
        new LatLng(13.041780, 77.567894)) 
    .color(Color.GREEN) 
    .width(66)); 
    Log.e("polylog", String.valueOf(polyline1.isVisible())); 
    Log.e("polylog", String.valueOf(polyline1)); 

} 

Answer 1

La question est

googleMap.setMyLocationEnabled(true); 

ligne

, parce que vous avez probablement pas accorder ACCESS_FINE_LOCATION et ACCESS_COARSE_LOCATION à votre application. Vous devez accorder manuellement à votre application via Applications menu de votre appareil Android ou mettre en œuvre le contrôle et accorder des autorisations comme dans Official Documentation et, par exemple, this réponse Daniel Nugent, quelque chose comme ça:

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback { 

    private static final int LOCATION_PERMISSION_REQUEST_CODE = 101; 
    private GoogleMap mGoogleMap; 
    private MapFragment mMapFragment; 

    private void makeLocationPermissionRequest() { 
     ActivityCompat.requestPermissions(this, 
       new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, LOCATION_PERMISSION_REQUEST_CODE); 
    } 

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

     mMapFragment = (MapFragment) getFragmentManager() 
       .findFragmentById(R.id.map_fragment); 
     mMapFragment.getMapAsync(this); 
    } 

    private void showPolyline() { 

     mGoogleMap.setMyLocationEnabled(true); 

     Polyline polyline1 = mGoogleMap.addPolyline(new PolylineOptions() 
       .clickable(true) 
       .add(
         new LatLng(13.034063, 77.567006), 
         new LatLng(13.034087, 77.568629), 
         new LatLng(13.034202, 77.569431), 
         new LatLng(13.034371, 77.570103), 
         new LatLng(13.034535, 77.570121), 
         new LatLng(13.036526, 77.570489), 
         new LatLng(13.037719, 77.570545), 
         new LatLng(13.038252, 77.570039), 
         new LatLng(13.039849, 77.570028), 
         new LatLng(13.040153, 77.569229), 
         new LatLng(13.040640, 77.568512), 
         new LatLng(13.041071, 77.567996), 
         new LatLng(13.041780, 77.567894)) 
       .color(Color.GREEN) 
       .width(66)); 

     mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(13.034063, 77.567006), 12)); 
    } 

    @Override 
    public void onMapReady(GoogleMap googleMap) { 
     mGoogleMap = googleMap; 

     if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
      int locationPermission = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION); 
      if (locationPermission != PackageManager.PERMISSION_GRANTED) { 
       makeLocationPermissionRequest(); 
      } else { 
       showPolyline(); 
      } 
     } else { 
      showPolyline(); 
     } 
} 

    @Override 
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) { 
     switch (requestCode) { 
      case LOCATION_PERMISSION_REQUEST_CODE: { 
       // If request is cancelled, the result arrays are empty. 
       if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 
        showPolyline(); 
       } else { 
       } 
       return; 
      } 
     } 
    } 

} 

Et ne pas oublier ajouter

à votre fichier AndroidManifest.xml. Et vous avez quelque chose comme ça: