Question

您好我是Android开发的新手，我想使用片段类在mapview中获取当前位置。当我添加setMyLocationEnabled方法时，它要求权限，我已在清单中添加了所有权限。请帮帮我。

Gmaps.java（片段）

public class Gmaps extends Fragment implements OnMapReadyCallback {

private GoogleMap googleMap;
private MapView mapView;
private boolean mapsSupported = true;
private GoogleApiClient mGoogleApiClient;

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    MapsInitializer.initialize(getActivity());

    if (mapView != null) {
        mapView.onCreate(savedInstanceState);
    }
    initializeMap();
}

private void initializeMap() {
    if (googleMap == null && mapsSupported) {
        mapView = (MapView) getActivity().findViewById(R.id.map);
        googleMap = mapView.getMap();

        double latitude = 0.00;
        double longitude = 0.00;

        MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude, longitude)).title("Marker");

        googleMap.addMarker(marker);

        CameraPosition cameraPosition = new CameraPosition.Builder().target(
                new LatLng(0, 0)).zoom(12).build();

        googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));


        googleMap.getUiSettings().setZoomControlsEnabled(true); // true to enable
        googleMap.getUiSettings().setZoomGesturesEnabled(true);
        googleMap.getUiSettings().setCompassEnabled(true);
        googleMap.getUiSettings().setMyLocationButtonEnabled(true);
        googleMap.getUiSettings().setRotateGesturesEnabled(true);
    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    final FrameLayout p = (FrameLayout) inflater.inflate(R.layout.fragment_gmaps, container, false);
    mapView = (MapView) p.findViewById(R.id.map);

    return p;
}

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

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

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

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

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

@Override
public void onMapReady(GoogleMap googleMap) {

}

在Manifest中，我添加了用于Google地图服务的所有权限

Answer 1

根据the documentation：

如果设备运行Android 6.0或更高版本，和，您应用的目标SDK为23或更高：应用必须列出清单中的权限，和< / em>它必须在应用程序运行时请求它所需的每个危险权限。用户可以授予或拒绝每个权限，即使用户拒绝权限请求，应用程序也可以继续以有限的功能运行。

这就是为什么你在清单文件中声明了权限的原因，你仍然需要在运行时请求它们。

作为解决方法，您可以设置minSdkVersion＆lt; 23，但也正如文件所说：

注意：从Android 6.0（API级别23）开始，用户可以随时撤消任何应用的权限，即使该应用针对较低的API级别也是如此。无论您的应用针对什么API级别，您都应该测试自己的应用，以验证其在错过所需权限时是否正常运行。

此外，根据Permissions Best Practices，您应针对这两种权限模型进行测试，以提供更好的用户体验。

Answer 2

试试这个：

public void showMap() {

    mapFragment = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map);
    if (map == null) {
        map = mapFragment.getMap();
    }


    // Enable Zoom
    map.getUiSettings().setZoomGesturesEnabled(true);

    //set Map TYPE
    map.setMapType(GoogleMap.MAP_TYPE_NORMAL);

    //enable Current location Button
    map.setMyLocationEnabled(true);

    LocationManager locationManager = (LocationManager)getActivity().getSystemService(getActivity().LOCATION_SERVICE);
    Criteria criteria = new Criteria();
    String bestProvider = locationManager.getBestProvider(criteria, true);
    if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    Location location = locationManager.getLastKnownLocation(bestProvider);
    if (location != null) {
        onLocationChanged(location);
    }
    locationManager.requestLocationUpdates(bestProvider, 2000, 0, this);
}

@Override
public void onLocationChanged(Location location) {

    latitude= location.getLatitude();
    longitude=location.getLongitude();

    LatLng loc = new LatLng(latitude, longitude);

     if (marker!=null){
         marker.remove();
     }

    marker=  map.addMarker(new MarkerOptions().position(loc).title("Sparx IT Solutions"));
    map.moveCamera(CameraUpdateFactory.newLatLng(loc));
    map.animateCamera(CameraUpdateFactory.newLatLngZoom(loc, 16.0f));

}

@Override
public void onProviderDisabled(String provider) {

    Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
    startActivity(intent);
    Toast.makeText(getActivity().getBaseContext(), "Gps is turned off!!",
            Toast.LENGTH_SHORT).show();
}

@Override
public void onProviderEnabled(String provider) {

    Toast.makeText(getActivity().getBaseContext(), "Gps is turned on!! ",
            Toast.LENGTH_SHORT).show();
}

在清单文件

中添加这些使用权限

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

如何使用片段类获取mapview上的当前位置？

2 个答案: