Android 片段中的LocationManager

我正在尝试将使用

LocationListener

的

活动

转换为

片段

，使用

LocationManager

如下：

受保护的LocationManager LocationManager

@Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    locationManager = (LocationManager) getActivity().getSystemService(
                Context.LOCATION_SERVICE);
(...)
}

我对这些方法有一些问题（无法消除错误）：

---

如何在片段中使用这些方法？

您混淆了实际接收更新的

LocationManager

和

LocationListener

之间的关系。例如，指示错误的onLocationChanged实际上是一个回调，您分配给该

LocationManager

的

LocationListener

使用该回调将新的location对象传递给您的活动/片段。这不是你所谓的你自己

您的

LocationListener

和

LocationManager

的交互方式是这样的。在你的片段中会有两个的实例

onActivityCreated

您可以使用

LocationListener

初始化

LocationManager

和

LocationListener

，实现下面所有必需的回调

 locationListener = new LocationListener(){

        @Override
        public void onLocationChanged(Location location) {
            GeoPoint userLoc = processNewLocation(location);
            if(userLoc != null){
                Log.d("USERLOC", userLoc.toString());
                                    //do something with the location    
            }
        }

        @Override
        public void onProviderDisabled(String provider) {
            locationManager = (LocationManager)getActivity().getSystemService(Context.LOCATION_SERVICE);
            if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
            } else {
                locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
            }
        }

        @Override
        public void onProviderEnabled(String provider) {
            locationManager = (LocationManager)getActivity().getSystemService(Context.LOCATION_SERVICE);
            if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
            } else {
                locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
            }
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub

        }

    };

您的

LocationListner

将在每次locatino更改满足您在创建时指定的任何标准时调用onLocationChanged。查看android文档，了解更多详细信息

 locationListener = new LocationListener(){

        @Override
        public void onLocationChanged(Location location) {
            GeoPoint userLoc = processNewLocation(location);
            if(userLoc != null){
                Log.d("USERLOC", userLoc.toString());
                                    //do something with the location    
            }
        }

        @Override
        public void onProviderDisabled(String provider) {
            locationManager = (LocationManager)getActivity().getSystemService(Context.LOCATION_SERVICE);
            if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
            } else {
                locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
            }
        }

        @Override
        public void onProviderEnabled(String provider) {
            locationManager = (LocationManager)getActivity().getSystemService(Context.LOCATION_SERVICE);
            if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
            } else {
                locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
            }
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub

        }

    };