在Android中使用MapController的setCenter方法時出現空指針異常

Question

我正在使用此代碼設置地圖的中心。

mapController.setCenter(new GeoPoint((int)(location.getLatitude()*1E6), (int) (location.getLongitude()*1E6))); 

其中作爲

locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
Criteria criteria = new Criteria(); 

criteria.setAccuracy(Criteria.ACCURACY_FINE); 
criteria.setAltitudeRequired(false); 
criteria.setBearingRequired(false); 
criteria.setCostAllowed(true); 

provider = locationManager.getBestProvider(criteria, true); 

Location location = locationManager.getLastKnownLocation(provider); 

我得到這個代碼空指針異常位置定義。我究竟做錯了什麼？

Answer 1

如果提供者當前被禁用，則返回null。

您可能從locationManager.getLastKnownLocation（provider）獲得null響應;

http://developer.android.com/reference/android/location/LocationManager.html#getLastKnownLocation%28java.lang.String%29