android - 我如何使用 API28 访问片段中的当前用户位置？

Question

我想访问片段中的当前位置，但我使用的是 API 28 和 android 版本 3.2.1。我尝试了互联网跟随教程中的所有内容，但我无法访问我当前的位置，我的代码中没有错误，但我不知道为什么我无法访问它。当我运行我的程序时，我只看到谷歌默认地图，没有标记等。如果网络提供商不可用，我想通过网络提供商以及 gps 提供商访问我的位置。我还在清单中添加权限

<uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

对于权限访问，我正在使用来自 github 的库以及用于 lacation 和 map

implementation 'pub.devrel:easypermissions:2.0.0'
implementation 'com.google.android.gms:play-services-maps:16.0.0'
implementation 'com.google.android.gms:play-services-location:16.0.0'

请检查我的代码并指导我如何访问我的代码在我的代码下方的当前位置还有计步器代码但忽略那个。

这是我的代码

public class HomeActivity extends Fragment implements SensorEventListener, OnMapReadyCallback {
    SensorManager sensorManager;
    TextView set_steps;
    TextView set_calories;
    TextView set_distance;
    boolean running = false;
    private static int steps;
    private static int calories;
    private static double distance;
    private GoogleMap mMap;
    LocationManager locationManager;
    public static final int Request_User_Location_Code = 99;
    GoogleApiClient googleApiClient;
    private LocationRequest locationRequest;
    private Location lastLocation;
    private Marker currentUserLocationMarker;
    private final int REQUEST_LOCATION_PERMISSION = 1;
    Provider provider;
    View view;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.activity_home, container, false);

        requestLocationPermission();


        stepsCounter();

        locationTracker();


        return view;
    }

    void stepsCounter() {
        set_steps = (TextView) view.findViewById(R.id.set_steps);
        set_calories = (TextView) view.findViewById(R.id.set_calories);
        set_distance = (TextView) view.findViewById(R.id.set_distance);

        sensorManager = (SensorManager) getActivity().getSystemService(Context.SENSOR_SERVICE);

    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }


    @Override
    public void onResume() {
        super.onResume();
        running = true;
        Sensor countSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
        if (countSensor != null) {
            sensorManager.registerListener((SensorEventListener) getActivity(), countSensor, SensorManager.SENSOR_DELAY_UI);
        } else {
            Toast.makeText(getActivity(), "Sensor not Found", Toast.LENGTH_SHORT).show();
        }

    }

    @Override
    public void onPause() {
        super.onPause();
        running = false;

    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (running) {

            steps = (int) event.values[0];
            set_steps.setText(steps + "");
            caloriesCounter();
            distanceCover();
        }

    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }

    void caloriesCounter() {

        calories = steps / 20;
        set_calories.setText(calories + "");


    }

    void distanceCover() {
        distance = (double) steps * 0.76;
        String distanceText = Double.toString(distance);
        set_distance.setText(distanceText);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;


    }

  void locationTracker() {
        SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
        locationManager = (LocationManager) getActivity().getSystemService(Context.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)) {

            }


        if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, new LocationListener() {
                @Override
                public void onLocationChanged(Location location) {
                    double latitude = location.getLatitude();
                    double longitude = location.getLongitude();
                    LatLng latLng= new LatLng(latitude,longitude);
                    Geocoder geocoder=new Geocoder(getActivity().getApplicationContext());
                    try {
                        List<Address> addressList = geocoder.getFromLocation(latitude,longitude,1);
                        String str = addressList.get(0).getLocality()+",";
                        str+= addressList.get(0).getCountryName();
                        mMap.addMarker(new MarkerOptions().position(latLng).title(str));
                        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
                    } catch (IOException e) {
                        e.printStackTrace();
                    }


                }

                @Override
                public void onStatusChanged(String provider, int status, Bundle extras) {

                }

                @Override
                public void onProviderEnabled(String provider) {

                }

                @Override
                public void onProviderDisabled(String provider) {

                }
            });
        } else if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, new LocationListener() {
                @Override
                public void onLocationChanged(Location location) {
                    double latitude = location.getLatitude();
                    double longitude = location.getLongitude();
                    LatLng latLng= new LatLng(latitude,longitude);
                    Geocoder geocoder=new Geocoder(getActivity().getApplicationContext());
                    try {
                        List<Address> addressList = geocoder.getFromLocation(latitude,longitude,1);
                        String str = addressList.get(0).getLocality()+",";
                        str+= addressList.get(0).getCountryName();
                        mMap.addMarker(new MarkerOptions().position(latLng).title(str));
                        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
                    } catch (IOException e) {
                        e.printStackTrace();
                    }


                }

                @Override
                public void onStatusChanged(String provider, int status, Bundle extras) {

                }

                @Override
                public void onProviderEnabled(String provider) {

                }

                @Override
                public void onProviderDisabled(String provider) {

                }
            });
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        // Forward results to EasyPermissions
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }

    @AfterPermissionGranted(REQUEST_LOCATION_PERMISSION)
    public void requestLocationPermission() {
        String[] perms = {Manifest.permission.ACCESS_FINE_LOCATION};
        if(EasyPermissions.hasPermissions(getActivity(), perms)) {
           // Toast.makeText(getActivity(), "Permission already granted", Toast.LENGTH_SHORT).show();
        }
        else {
            EasyPermissions.requestPermissions(this, "Please grant the location permission", REQUEST_LOCATION_PERMISSION, perms);
        }
    }


}

但请记住我使用的是 ApI 28

标签： androidgoogle-maps