为什么我无法获取位置信息？ 当我使用 AppCompatActivity 扩展我的类时，我可以得到一个位置。但是当我使用碎片扩展时，我无法获得位置。
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一个"地图框"地图。我找不到这方面的示例代码。 我用谷歌地图做了这个。我不能用地图框。你能告诉我问题出在哪里吗？ 你有什么建议吗？
如果您尝试在地图片段中显示设备位置区域(LocationComponent(，请参阅 https://docs.mapbox.com/android/maps/examples/show-a-users-location-on-a-fragment。
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具有片段结构的映射框，需要考虑一些事项。
确保导入的库是"映射框"。有时可以导入谷歌库，这会导致错误。
- 使用"getActivity"而不是"this"。
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