我创建了一个跟踪用户并绘制折线的应用程序。在某些手机中，当手机被锁定时，onlocationchanged 监听器会停止工作，并且不会获取用户经过的位置，因此不会绘制折线。
有人可以告诉我如何解决我的问题吗？为什么当手机被锁定时，位置监听器停止工作？
这是我的代码片段：
package ir.fragments;
public class OneFragment extends Fragment implements
PermissionsListener,
MapboxMap.OnMapClickListener,
OnMapReadyCallback,
LocationListener, SensorEventListener, StepListener {
private List<LatLng> points = new ArrayList<>();
private LocationComponent locationComponent;
private PermissionsManager permissionsManager;
private LocationEngine locationEngine;
private MapboxMap mapboxMap_global;
public OneFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
cx = getActivity();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Mapbox.getInstance(getActivity(), getString(R.string.mapbox_access_token));
view = inflater.inflate(R.layout.fragment_one, container, false);
my_configMap(savedInstanceState);
return view;
}
//-----------------------------------------//
//-----------START NAVIGATION--------------//
//-----------------------------------------//
@SuppressLint("MissingPermission")
@Override
public void onMapReady(@NonNull MapboxMap mapboxMap) {
mapboxMap_global = mapboxMap;
obj_myMAPBOX = new MY_MAPBOX_CLASS(mapboxMap_global, "waiting", "1");
mapboxMap_global.addOnMapClickListener(this);
mapboxMap_global.setStyle(Style.MAPBOX_STREETS, style -> {
if (PermissionsManager.areLocationPermissionsGranted(getActivity())) {
locationComponent = mapboxMap.getLocationComponent();
locationComponent.activateLocationComponent(getActivity(), style);
locationComponent.setRenderMode(RenderMode.GPS);
locationComponent.setLocationComponentEnabled(true);
locationComponent.setCameraMode(CameraMode.TRACKING_COMPASS);
this.map_style = style;
//--------------****peida kardane location avaliye****--------////
LocationEngine locationEngine1 = LocationEngineProvider.getBestLocationEngine(getActivity());
locationEngine1.getLastLocation(new LocationEngineCallback<LocationEngineResult>() {
@Override
public void onSuccess(LocationEngineResult result) {
//Toast.makeText(getActivity(),"Place Your First Option Code",Toast.LENGTH_SHORT).show();
if (fill_My_Primary_Location(result)) {
//get_activity_info();
CameraPosition position = new CameraPosition.Builder()
.target(userCurrentLocation_latLng)
.zoom(15)
.tilt(20)
.build();
mapboxMap.animateCamera(CameraUpdateFactory.newCameraPosition(position), 500);
}
}
@Override
public void onFailure(@NonNull Exception exception) {
}
});
//--------------****end of peida kardane location avaliye****--------////
lm = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
//lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
this.onLocationChanged(null);
} else {
permissionsManager = new PermissionsManager(this);
permissionsManager.requestLocationPermissions(getActivity());
}
});
}
@Override
public void onLocationChanged(Location location) {
//Toast.makeText(getActivity(),"im changing"+location,Toast.LENGTH_LONG).show();
if (location != null)
{
Location s1 = new Location("");
s1.setLatitude(stations.get(race_station).getLatitude());
s1.setLongitude(stations.get(race_station).getLongitude());
drawPolyline(s1);
}
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
@Override
public void onSensorChanged(SensorEvent event) {
}
@Override
public void onAccuracyChanged(Sensor sensor, int i) {
}
@Override
public void step(long timeNs) {
if (status.equals("start")) {
numSteps++;
F1_TextView_1.setText(numSteps + "");
}
}
//-----------------------------------------//
//-----------END NAVIGATION--------------//
//-----------------------------------------//
@Override
public void onExplanationNeeded(List<String> permissionsToExplain) {
}
@Override
public void onPermissionResult(boolean granted) {
}
@Override
public boolean onMapClick(@NonNull LatLng point) {
return false;
}
public void my_configMap(Bundle savedInstanceState) {
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
// Add the mapView's own lifecycle methods to the activity's lifecycle methods
@Override
public void onStart() {
super.onStart();
mapView.onStart();
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
public void onStop() {
super.onStop();
mapView.onStop();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
public void onDestroyView() {
super.onDestroyView();
mapView.onDestroy();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
}