地图不显示带有标记的当前位置

Posted 2023-02-23

【中文标题】地图不显示带有标记的当前位置

【英文标题】：Map doesnt show current location with marker

【发布时间】：2017-11-20 16:40:22

【问题描述】：

我正在使用导航抽屉，在那个选项中我需要为谷歌地图提供一个选项。我想显示用户的当前位置，并用标记在他的位置持续更新。 Foll是我的代码

public class MapView extends Fragment implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener

    GoogleMap m_map;
    boolean mapReady = false;
    private GoogleApiClient googleApiClient;
    private LocationListener locationListener;
    private Marker marker;

    public MapView() 
        // Required empty public constructor
    

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

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) 
        // Inflate the layout for this fragment
        View view=inflater.inflate(R.layout.fragment_map_view, container, false);
        SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);

        mapFragment.getMapAsync(this);


        return view;
    


    @Override
    public void onMapReady(GoogleMap googleMap) 
        mapReady = true;
        m_map = googleMap;

        googleApiClient = new GoogleApiClient.Builder(getActivity()).addApi(LocationServices.API).addConnectionCallbacks(this).addOnConnectionFailedListener(this).build();
        googleApiClient.connect();


    






    @Override
    public void onConnected(@Nullable Bundle bundle) 
        locationListener = new LocationListener() 
            @Override
            public void onLocationChanged(Location location) 
                gotoLocation(location.getLatitude(), location.getLongitude(), 15);
            
        ;
        LocationRequest locationRequest = LocationRequest.create();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        locationRequest.setInterval(5000);
        locationRequest.setFastestInterval(1000);
        LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, locationListener);
    

    @Override
    public void onConnectionSuspended(int i) 

    

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) 

    

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) 
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 0) 
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED &&
                    grantResults[1] == PackageManager.PERMISSION_GRANTED && grantResults[2] == PackageManager.PERMISSION_GRANTED) 
                showLocation();
            
        
    

    public void showLocation() 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
            if (getActivity().checkSelfPermission(android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED
                    && getActivity().checkSelfPermission(android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED

                    ) 
                requestPermissions(new String[]android.Manifest.permission.ACCESS_COARSE_LOCATION,
                        android.Manifest.permission.ACCESS_FINE_LOCATION,
                , 0);
             else 
                Location location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
                if (location == null) 
                    Toast.makeText(getActivity(), "Failed", Toast.LENGTH_LONG).show();
                 else 
                    Toast.makeText(getActivity(), "Failed", Toast.LENGTH_LONG).show();
                    LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
                    CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 15);
                    m_map.animateCamera(cameraUpdate);
                
            

         else 
            Location location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
            if (location == null) 
                Toast.makeText(getActivity(), "Failed", Toast.LENGTH_LONG).show();
             else 
                LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
                CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 15);
                m_map.animateCamera(cameraUpdate);
            

        


    

    public void gotoLocation(double lat, double lng, float zoom) 
        LatLng latLng = new LatLng(lat, lng);
        CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, zoom);
        m_map.moveCamera(cameraUpdate);
        if(marker!=null)
            marker.remove();
        


        MarkerOptions markerOptions=new MarkerOptions()
                .position(new LatLng(lat,lng))
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.bg));
        //dont put image in mipmap for marker
        marker= m_map.addMarker(markerOptions);



    

    @Override
    public void onPause() 
        super.onPause();
        LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, locationListener);
    



<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_
    android:layout_
    tools:context="sawant.pritish.com.sharingfoodandhappiness.MapView.MapView">

    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_
        android:layout_
        />



</FrameLayout>

我已经添加了所有必要的权限，例如互联网、访问精细和粗略的位置以及访问网络状态。我已经添加了元数据标签并使用了功能标签。有人可以帮忙吗。

【参考方案1】：

您可以通过更简单的解决方案来实现：只需调用

googleMap.setMyLocationEnabled(true);

在android.Manifest.permission.ACCESS_COARSE_LOCATION 或android.Manifest.permission.ACCESS_FINE_LOCATION 授予权限后的onMapReady(GoogleMap googleMap) 回调中。类似的东西：

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback 

    private static final int LOCATION_PERMISSION_REQUEST_CODE = 101;
    private GoogleMap mGoogleMap;
    private MapFragment mMapFragment;

    private void makeLocationPermissionRequest() 
        ActivityCompat.requestPermissions(this,
                new String[]android.Manifest.permission.ACCESS_FINE_LOCATION, LOCATION_PERMISSION_REQUEST_CODE);
    

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mMapFragment = (MapFragment) getFragmentManager()
                .findFragmentById(R.id.map_fragment);
        mMapFragment.getMapAsync(this);
    

    private void showCurrentPositionMarker() 
        mGoogleMap.setMyLocationEnabled(true);
   

    @Override
    public void onMapReady(GoogleMap googleMap) 
        mGoogleMap = googleMap;

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
            int locationPermission = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
            if (locationPermission != PackageManager.PERMISSION_GRANTED) 
                makeLocationPermissionRequest();
             else 
                showCurrentPositionMarker();
            
         else 
            showCurrentPositionMarker();
        


    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) 
        switch (requestCode) 
            case LOCATION_PERMISSION_REQUEST_CODE: 
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
                    showCurrentPositionMarker();
                 else 
                
                return;