我的 class 是逐个片段的。我找不到位置

Question

为什么我无法获取位置信息？当我用 AppCompatActivity 扩展我的 class 时，我可以获得一个位置。但是当我扩展片段时，我找不到位置。

public class Fragment_Ucuncu extends Fragment implements OnMapReadyCallback, PermissionsListener {
    private MapView mapView;
    private PermissionsManager permissionsManager;

    private MapboxMap mapboxMap;

    private final String MAPKIT_API_KEY = "delete";
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        Mapbox.getInstance(getActivity() , "delete");
        View rootView = inflater.inflate(R.layout.fragment_ucuncu_layout, container, false);

        mapView = rootView.findViewById(R.id.mapView);
        mapView.onCreate(savedInstanceState);

        mapView.getMapAsync(new OnMapReadyCallback() {
            @Override
            public void onMapReady(@NonNull MapboxMap mapboxMap) {
                mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
                    @Override
                    public void onStyleLoaded(@NonNull Style style) {

                    }
                });
            }
        });




        return rootView;

    }
    @Override
    public void onMapReady(@NonNull final MapboxMap mapboxMap) {
        Fragment_Ucuncu.this.mapboxMap = mapboxMap;

        mapboxMap.setStyle(new Style.Builder().fromUri("mapbox://styles/mapbox/cjerxnqt3cgvp2rmyuxbeqme7"),
                new Style.OnStyleLoaded() {
                    @Override
                    public void onStyleLoaded(@NonNull Style style) {
                        enableLocationComponent(style);
                    }
                });
    }
    private void enableLocationComponent(@NonNull Style loadedMapStyle) {
// Check if permissions are enabled and if not request
        if (PermissionsManager.areLocationPermissionsGranted(getActivity())) {

// Get an instance of the component
            LocationComponent locationComponent = mapboxMap.getLocationComponent();

// Activate with options
            locationComponent.activateLocationComponent(
                    LocationComponentActivationOptions.builder(getActivity(), loadedMapStyle).build());

// Enable to make component visible
            locationComponent.setLocationComponentEnabled(true);

// Set the component's camera mode
            locationComponent.setCameraMode(CameraMode.TRACKING);

// Set the component's render mode
            locationComponent.setRenderMode(RenderMode.COMPASS);
        } else {
            permissionsManager = new PermissionsManager(this);
            permissionsManager.requestLocationPermissions(getActivity());
        }
    }

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

    @Override
    public void onExplanationNeeded(List<String> permissionsToExplain) {
        Toast.makeText(getActivity(), "one", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onPermissionResult(boolean granted) {
        if (granted) {
            mapboxMap.getStyle(new Style.OnStyleLoaded() {
                @Override
                public void onStyleLoaded(@NonNull Style style) {
                    enableLocationComponent(style);
                }
            });
        } else {
            Toast.makeText(getActivity(), "two", Toast.LENGTH_LONG).show();
            getActivity().finish();
        }
    }

    @Override
    public void onStart() {
        super.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 onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mapView.onSaveInstanceState(outState);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mapView.onDestroy();
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mapView.onLowMemory();
    }

}

我需要在导航抽屉的片段中显示 "mapbox" 地图。我找不到这方面的示例代码。我用 google 地图做了这个。我无法使用 Mapbox。你能告诉我问题出在哪里吗？你有什么建议吗？

Answer 1

如果您尝试在地图片段中显示设备位置圆盘（LocationComponent），请参阅 https://docs.mapbox.com/android/maps/examples/show-a-users-location-on-a-fragment。

Answer 2

我解决了这个问题。它对我有用。

package com.one.qaroco;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import androidx.fragment.app.Fragment;

import com.mapbox.android.core.permissions.PermissionsListener;
import com.mapbox.android.core.permissions.PermissionsManager;

import com.mapbox.mapboxsdk.maps.MapboxMap;
import android.widget.Toast;

import com.mapbox.android.core.permissions.PermissionsListener;
import com.mapbox.android.core.permissions.PermissionsManager;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.camera.CameraPosition;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.location.LocationComponent;
import com.mapbox.mapboxsdk.location.LocationComponentActivationOptions;
import com.mapbox.mapboxsdk.location.modes.CameraMode;
import com.mapbox.mapboxsdk.location.modes.RenderMode;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.MapboxMapOptions;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.maps.Style;
import com.mapbox.mapboxsdk.maps.SupportMapFragment;

import java.util.List;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;

public class FragmentBirinci extends Fragment implements PermissionsListener {
    private MapboxMap mapboxMap;
    private PermissionsManager permissionsManager;

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


        // Mapbox access token is configured here. This needs to be called either in your application
        // object or in the same activity which contains the mapview.
        Mapbox.getInstance(getActivity(), getString(R.string.access_token));

        // Create supportMapFragment
        SupportMapFragment mapFragment;
        if (savedInstanceState == null) {

            // Create fragment
            final FragmentTransaction transaction = getFragmentManager().beginTransaction();

            // Build a Mapbox map
            MapboxMapOptions options = MapboxMapOptions.createFromAttributes(getActivity(), null);
            options.camera(new CameraPosition.Builder()
                    .target(new LatLng(38.899895, -77.03401))
                    .zoom(9)
                    .build());

            // Create map fragment
            mapFragment = SupportMapFragment.newInstance(options);

            // Add map fragment to parent container
            transaction.add(R.id.location_frag_container, mapFragment, "com.mapbox.map");
            transaction.commit();
        } else {
            mapFragment = (SupportMapFragment) getFragmentManager().findFragmentByTag("com.mapbox.map");
        }

        if (mapFragment != null) {
            mapFragment.getMapAsync(new OnMapReadyCallback() {
                @Override
                public void onMapReady(@NonNull MapboxMap mapboxMap) {
                    FragmentBirinci.this.mapboxMap = mapboxMap;
                    mapboxMap.setStyle(Style.OUTDOORS, new Style.OnStyleLoaded() {
                        @Override
                        public void onStyleLoaded(@NonNull Style style) {
                            enableLocationComponent(style);
                        }
                    });
                }
            });
        }

        return rootView;


    }

    @SuppressWarnings( {"MissingPermission"})
    private void enableLocationComponent(@NonNull Style loadedMapStyle) {
        // Check if permissions are enabled and if not request
        if (PermissionsManager.areLocationPermissionsGranted(getActivity())) {

            // Get an instance of the LocationComponent.
            LocationComponent locationComponent = mapboxMap.getLocationComponent();

            // Activate the LocationComponent
            locationComponent.activateLocationComponent(
                    LocationComponentActivationOptions.builder(getActivity(), loadedMapStyle).build());

            // Enable the LocationComponent so that it's actually visible on the map
            locationComponent.setLocationComponentEnabled(true);

            // Set the LocationComponent's camera mode
            locationComponent.setCameraMode(CameraMode.TRACKING);

            // Set the LocationComponent's render mode
            locationComponent.setRenderMode(RenderMode.NORMAL);
        } else {
            permissionsManager = new PermissionsManager(this);
            permissionsManager.requestLocationPermissions(getActivity());
        }
    }

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

    @Override
    public void onExplanationNeeded(List<String> permissionsToExplain) {
        Toast.makeText(getActivity(), R.string.user_location_permission_explanation, Toast.LENGTH_LONG).show();
    }

    @Override
    public void onPermissionResult(boolean granted) {
        if (granted) {
            mapboxMap.getStyle(new Style.OnStyleLoaded() {
                @Override
                public void onStyleLoaded(@NonNull Style style) {
                    enableLocationComponent(style);
                }
            });
        } else {
            Toast.makeText(getActivity(), R.string.user_location_permission_not_granted, Toast.LENGTH_LONG).show();
            getActivity().finish();
        }
    }
}

如果要在导航抽屉中使用片段结构的 mapbox，需要考虑一些事项。

Make sure that the imported libraries are "mapbox". Sometimes google libraries can be imported and this causes errors.

Use "getActivity" instead of "this".

mapbox.com

github mapbox

github issues

我的 class 是逐个片段的。我找不到位置

My class is extent by fragment. I can't get a location

mapbox-android

我解决了这个问题。它对我有用。