如何使用片段类在mapview上获取当前位置? [英] How can I get current location on mapview using fragment class?

问题描述

你好，我是android开发的新手，我想使用fragment类在mapview中获取当前位置.当我添加setMyLocationEnabled方法时，它正在请求权限，并且我已在清单中添加了所有权限.请帮助我.

Hello I am new in android development and i want to get current location in mapview using fragment class. when i am adding setMyLocationEnabled method it is asking for permissions and i have added all the permissions in manifest. Please help me .

Gmaps.java(片段)

Gmaps.java (fragment)

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) {

}

在清单中，我已添加了用于Google地图服务的所有这些权限

In Manifest, I have added all these permissions used for google map services

推荐答案

尝试一下:

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

add these uses-permissions in Manifest file

<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" />

这篇关于如何使用片段类在mapview上获取当前位置?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！