我不明白为什么 locationManager.getLastKnownLocation（LocationManager.GPS_PROVIDER）; 返回的位置空。我把所有的权限，但其reutning 空。

 如果（isGPSEnabled）{
            如果（位置== NULL）{
                locationManager.requestLocationUpdates（
                        LocationManager.GPS_PROVIDER，
                        MIN_TIME_BW_UPDATES，
                        MIN_DISTANCE_CHANGE_FOR_UPDATES，这一点）;
                Log.d（全球定位系统，GPS功能的）;
                如果（locationManager！= NULL）{
                    位置= locationManager
                            .getLastKnownLocation（LocationManager.GPS_PROVIDER）;
                    如果（位置！= NULL）{
                        纬度= location.getLatitude（）;
                        经度= location.getLongitude（）;
                    }
                }
            }
        }
 

解决方案

我有此相同的问题。这是因为我的设备没有存储最后已知位置。我只是去上谷歌地图，并明确指出我的位置有GPS，那么这个值是返回getLastKnownLocation（）

i dont understand why locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); return the location null. I gave all permission but its reutning null.

          if (isGPSEnabled) {
            if (location == null) {
                locationManager.requestLocationUpdates(
                        LocationManager.GPS_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("GPS", "GPS Enabled");
                if (locationManager != null) {
                    location = locationManager
                            .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                    if (location != null) {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }
        }

I had this exact same problem. It was because my device was not storing a last known location. I simply went on to Google Maps and pinpointed my location with GPS, then a value was returned for getLastKnownLocation()