如何解决Android getSystemServices 在 Fragment 中未定义?
我试图在片段中使用地理定位并在初始化 (LocationManager)getSystemService(LOCATION_SERVICE) 时出错。
@Override
public void onViewCreated(@NonNull View view,@Nullable Bundle savedInstanceState) {
super.onViewCreated(view,savedInstanceState);
SupportMapFragment mapFragment =
(SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
if (mapFragment != null) {
mapFragment.getMapAsync(callback);
location = (LocationManager)getSystemService(LOCATION_SERVICE);
if (ActivityCompat.checkSelfPermission(getActivity(),Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(),Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION},12);
return;
}
location.requestLocationUpdates(LocationManager.GPS_PROVIDER,new LocationListener() {
@Override
public void onLocationChanged(@NonNull Location location) {
String title = "";
double lat = location.getLatitude();
double longitude = location.getLongitude();
try {
Geocoder geo = new Geocoder(getActivity());
List<Address> address = geo.getFromLocation(lat,longitude,1);
title = address.get(0).getCountryName() + "," + address.get(0).getLocality();
} catch (IOException e) {
e.printstacktrace();
}
LatLng mylocaion = new LatLng(lat,longitude);
mMap.addMarker(new MarkerOptions().position(mylocaion).title(title));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mylocaion,10.2f));
}
});
location.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,new LocationListener() {
@Override
public void onLocationChanged(@NonNull Location location) {
String title = "";
double lat = location.getLatitude();
double longitude = location.getLongitude();
try {
Geocoder geo = new Geocoder(getActivity());
List<Address> address = geo.getFromLocation(lat,1);
// I'm trying to use geolocation in fragments and getting error while initialization (LocationManager)getSystemService(LOCATION_SERVICE).
title = address.get(0).getCountryName() + "," + address.get(0).getLocality();
} catch (IOException e) {
e.printstacktrace();
}
LatLng mylocaion = new LatLng(lat,10.2f));
}
});
}
}
解决方法
用getSystemService()
替换requireContext().getSystemService()
在此之前尝试使用 getContext() 或 getActivity()。您将需要片段中的上下文。
也看看这个。 getSystemServices is undefined when called in a Fragment?
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