안드로이드에서지도의 중심점을 얻는 방법은 무엇입니까?

Question

Google지도에서 길게 터치하여 latLng을 얻는 Android 애플리케이션을 제작 중입니다. 여기

코드입니다 : 내가해야 할 것은 내가 lat = map.getCameraPosition().target;을 사용했다 내가 위도의 값을 토스트 할 때, 그것은

0.0 토스트입니다

public class MainActivitytut extends FragmentActivity{ 

GoogleMap googleMap; 
MarkerOptions markerOptions; 
LatLng latLng; 
private TextView myAddress; 
String lat; 
TextView txtmapinfo; 

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



    //onBackPressed(); 
    SupportMapFragment supportMapFragment = (SupportMapFragment) 
      getSupportFragmentManager().findFragmentById(R.id.map); 

    // Getting a reference to the map 
     googleMap = supportMapFragment.getMap(); 

     // Setting a click event handler for the map 
     googleMap.setOnMapClickListener(new OnMapClickListener() { 

      @Override 
      public void onMapClick(LatLng arg0) {    

       // Getting the Latitude and Longitude of the touched location 
       latLng = arg0; 
       lat = latLng.toString(); 
      // Toast.makeText(getApplicationContext(), lat, 
     //    Toast.LENGTH_LONG).show(); 
      // getMyLocationAddress(); 
       // Clears the previously touched position 
       googleMap.clear(); 

       // Animating to the touched position         
       googleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));    

       // Creating a marker 
       markerOptions = new MarkerOptions(); 

       // Setting the position for the marker 
       markerOptions.position(latLng);      

       // Placing a marker on the touched position 
       googleMap.addMarker(markerOptions); 

       // Adding Marker on the touched location with address 
       new ReverseGeocodingTask(getBaseContext()).execute(latLng);    

      } 
     });  

    } 


protected void putExtra(String string, CharSequence text) { 
    // TODO Auto-generated method stub 

} 


@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is 
    // present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 

} 
} 

그 때지도에게 위도와 경도 변화를 강타에 토스트. 지도가로드 한 후 getCameraPosition 호출 할 때까지

Answer 1

기다립니다 :

mMap.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() { 
    @Override 
    public void onMapLoaded() { 
     LatLng pos = mMap.getCameraPosition().target; 
     Log.e("", "Pos: " + pos.toString()); 
     mMap.addMarker(new MarkerOptions().position(pos)); 
    } 
});