【问题标题】:display current location in MapFragment在 MapFragment 中显示当前位置
【发布时间】:2017-09-08 11:15:37
【问题描述】:

我有一个位置类,它在 MapFragment 上创建一个实例,并且根据创建地图的活动,将放置一个不同的标记。我还希望地图显示手机当前位置的标记。

我假设我可以做这样的事情,但我不知道如何获取和更新手机当前坐标并将其分配给 myLocation。

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_location);

MapFragment googleMap = (MapFragment) getFragmentManager().findFragmentById(R.id.map);
    googleMap.getMapAsync(this);

    }

    @Override
            public void onMapReady(GoogleMap nMap){

        if(MainMenu.bkSource == true) {
            LatLng bkLatLng = new LatLng(54.5816008, -5.9651271);
            LatLng myLocation = new LatLng(???);
            nMap.addMarker(new MarkerOptions().position(bkLatLng).title("Burger King, Boucher Road"));
            nMap.addMarker(new MarkerOptions().position(myLocation).title("You Are Here");
            nMap.moveCamera(CameraUpdateFactory.newLatLngZoom(bkLatLng, 15));
            nMap.animateCamera(CameraUpdateFactory.zoomTo(18.0f));
        }
        if(MainMenu.kfcSource == true){
            LatLng bkLatLng = new LatLng(54.5771914, -5.9620562);
            nMap.addMarker(new MarkerOptions().position(bkLatLng).title("KFC, Boucher Road"));
            nMap.moveCamera(CameraUpdateFactory.newLatLngZoom(bkLatLng, 15));
            nMap.animateCamera(CameraUpdateFactory.zoomTo(18.0f));
        }
        if(MainMenu.mcdSource == true){
            LatLng bkLatLng = new LatLng(54.5879486, -5.9580009);
            nMap.addMarker(new MarkerOptions().position(bkLatLng).title("McDonald's, Boucher Road"));
            nMap.moveCamera(CameraUpdateFactory.newLatLngZoom(bkLatLng, 15));
            nMap.animateCamera(CameraUpdateFactory.zoomTo(18.0f));
        }

    }

【问题讨论】:

标签: java android


【解决方案1】:

在你的 Fragment 中实现这个。

implements GoogleMap.InfoWindowAdapter, OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener

然后创建一个全局变量。

 private GoogleMap mMap;
 private GoogleApiClient mGoogleApiClient;
 double curt_lat = 0;
 double curt_log = 0;
 int Locationtry = 0;

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


        if (gps == null)
            gps = new GPSTracker(getActivity());

        checkPermision();
    }



@Override
    public void onConnected(@Nullable Bundle bundle) {

        if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            //    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 mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);
        if (mLastLocation != null) {
            Log.e(TAG, "onConnected: " + String.valueOf(mLastLocation.getLatitude()) + ":" + String.valueOf(mLastLocation.getLongitude()));
            try {

                curt_lat = mLastLocation.getLatitude();
                curt_log = mLastLocation.getLongitude();
                Log.d(TAG, "OnConnected-" + "" + mLastLocation.getLatitude() + "" + mLastLocation.getLongitude());
                selectMapFragment();
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else {
            getLocationFormGoogleApi();   // OnConnected
            ((Handler) new Handler()).postDelayed(new Runnable() {
                @Override
                public void run() {
                    if (Locationtry < 2) {
                        Locationtry++;
                        if (mGoogleApiClient != null) {
                            mGoogleApiClient.disconnect();
                        }
                        mGoogleApiClient = null;
                        getLocationFormGoogleApi();
                        // OnConnected
//                        Consts.displayDialog(MapsActivity.this);
                    } else {
                        Locationtry = 0;
//                        Consts.stopDialog();
//                        Consts.animationDialog(false, AllRestaurntMapActivity.this, R.layout.activity_all_restaurnt_map);
//                        isAnimation = false;

                    }
                }
            }, 10000);
        }

    }



 @Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            Log.i(TAG, "resultCode: " + resultCode);

            if (requestCode == 1) {
                if (isGPSEnable()) {

                    Log.d(TAG, "get GPS Enable");

                    checkPermision();
                    getLocationFormGoogleApi();


                } else {
                    isGpsDialogOpen = false;
                    Log.d(TAG, "GPS NOT Enable");
                }
            }
            super.onActivityResult(requestCode, resultCode, data);
        }

        public boolean isGPSEnable() {
            LocationManager locationManager = (LocationManager) getActivity().getSystemService(LOCATION_SERVICE);
            return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        }

        public void getLocationFormGoogleApi() {
            Log.d(TAG, "getLocationFormGoogleApi");
    //        Consts.animationDialog(true, AllRestaurntMapActivity.this, R.layout.activity_all_restaurnt_map);
    //        new Handler().postDelayed(animation, 0);
            // Create an instance of GoogleAPIClient.
            if (mGoogleApiClient == null) {
                Log.d(TAG, "get the LagLog... ");
                mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
                        .addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this)
                        .addApi(LocationServices.API)
                        .build();

            } else {
                Log.d(TAG, "all ready have LagLog... ");
    //            makeReq(String.valueOf(UserInfo.getLatitude()), String.valueOf(UserInfo.getLongitude()));

                Log.d(TAG, "get the LagLog... from permission request accept.. ");
                mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
                        .addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this)
                        .addApi(LocationServices.API)
                        .build();

                mGoogleApiClient.connect();
            }
        }

@Override
    public void onMapReady(GoogleMap googleMap) {
        Log.d(TAG, "onMapReady");
        if (mMap != null) {
            mMap.clear();
        }


        String url = "";

        mMap = googleMap;
        mMap.getUiSettings().setMapToolbarEnabled(false);

        final LatLngBounds.Builder mapboundbuilder = new LatLngBounds.Builder();

        // lat log driver....
        Log.d(TAG, "LatLog driver :" + curt_lat + "," + curt_log);
        LatLng latLng = new LatLng(curt_lat, curt_log);
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_map_one));
        markerOptions.position(latLng);
        markerOptions.title("You are Here!");
//        markerOptions.snippet("");
        mMap.addMarker(markerOptions);
        mapboundbuilder.include(latLng);
        LatLngBounds tmpbnd = mapboundbuilder.build();


        Log.v("connectionurl", url);


        LatLng center = tmpbnd.getCenter();
        LatLng northEast = Consts.mappointmove(center, 209, 209);
        LatLng southWest = Consts.mappointmove(center, 209, 209);
        mapboundbuilder.include(southWest);
        mapboundbuilder.include(northEast);

        LatLngBounds bounds = mapboundbuilder.build();

        try {
            int width, height;
            Display display = getActivity().getWindowManager().getDefaultDisplay();
            Point size = new Point();
            display.getSize(size);
            width = size.x;
            height = size.y - 250;
            CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, width, height, 100);
            googleMap.animateCamera(cu);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }

    @Override
    public void onStop() {
        if (mGoogleApiClient != null) {
            mGoogleApiClient.disconnect();
        }

        super.onStop();
    }

    @Override
    public void onStart() {
        if (mGoogleApiClient != null) {
            Log.d(TAG, "Location not Null");
            mGoogleApiClient.connect();
        }

        super.onStart();
    }

GPSTracker.java

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;


public class GPSTracker extends Service implements LocationListener {

    private static final String TAG = GPSTracker.class.getSimpleName();
    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = true;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);


            if (!isGPSEnabled) {

            } else {
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        canGetLocation = true;
                        Log.d("GPS Enabled", "GPS Enabled");

                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
//                                SharedPreferenceUtil.putValue(Preferences.TAG_LATITUDE,""+latitude);
//                                SharedPreferenceUtil.putValue(Preferences.TAG_LONGITUDE,""+longitude);
//                                SharedPreferenceUtil.save();
//                                Preferences.TAG_G_L = "G";

                                Log.d("gps", latitude + "," + longitude);
                            }
                        }
                    } else {
                        canGetLocation = false;
                        Log.d("gps", "GPS Disable");
                    }
                }
            }

            if (!isNetworkEnabled) {
                // no network provider is enabled
            } else {
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
//                    Preferences.TAG_G_L = "L";
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
//                            SharedPreferenceUtil.putValue(Preferences.TAG_LATITUDE,""+latitude);
//                            SharedPreferenceUtil.putValue(Preferences.TAG_LONGITUDE,""+longitude);
//                            SharedPreferenceUtil.save();
                            Log.d("network", latitude + "," + longitude);
                        }
                    }
                    Log.d("network", latitude + "," + longitude);
                }
            }



           /* if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                // First get location from Network Provider
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                            SharedPreferenceUtil.putValue(Preferences.TAG_LATITUDE,""+latitude);
                            SharedPreferenceUtil.putValue(Preferences.TAG_LONGITUDE,""+longitude);
                            SharedPreferenceUtil.save();
                            Log.d("gps",latitude+","+longitude);
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                                SharedPreferenceUtil.putValue(Preferences.TAG_LATITUDE,""+latitude);
                                SharedPreferenceUtil.putValue(Preferences.TAG_LONGITUDE,""+longitude);
                                SharedPreferenceUtil.save();
                                Log.d("gps",latitude+","+longitude);
                            }
                        }
                    }
                }
            }*/

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     */
    public void stopUsingGPS() {

        if (locationManager != null) {
                locationManager.removeUpdates(GPSTracker.this);
            }


    }

    /**
     * Function to get latitude
     */
    public double getLatitude() {
        if (location != null) {
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * function to get longitude
     *
     * @return double
     */
    public double getLongitude() {
        if (location != null) {
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     *
     * @return boolean
     */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     */
    public void showSettingsAlert() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.e(TAG, "onLocationChanged: " + location.toString());
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

【讨论】:

    【解决方案2】:

    这是一个扩展 SupportMapFragment 的示例 Fragment,在启动时它将获取用户的当前位置、放置标记并放大:

    public class MapFragment extends SupportMapFragment
        implements OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {
    
    GoogleMap mGoogleMap;
    SupportMapFragment mapFrag;
    LocationRequest mLocationRequest;
    GoogleApiClient mGoogleApiClient;
    Location mLastLocation;
    Marker mCurrLocationMarker;
    
    @Override
    public void onResume() {
        super.onResume();
    
        setUpMapIfNeeded();
    }
    
    private void setUpMapIfNeeded() {
    
        if (mGoogleMap == null) {
            getMapAsync(this);
        }
    }
    @Override
    public void onPause() {
        super.onPause();
    
        //stop location updates when Activity is no longer active
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }
    
    @Override
    public void onMapReady(GoogleMap googleMap)
    {
        mGoogleMap=googleMap;
        mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
    
        //Initialize Google Play Services
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(getActivity(),
                    Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {
                //Location Permission already granted
                buildGoogleApiClient();
                mGoogleMap.setMyLocationEnabled(true);
            } else {
                //Request Location Permission
                checkLocationPermission();
            }
        }
        else {
            buildGoogleApiClient();
            mGoogleMap.setMyLocationEnabled(true);
        }
    }
    
    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mGoogleApiClient.connect();
    }
    
    @Override
    public void onConnected(Bundle bundle) {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(1000);
        mLocationRequest.setFastestInterval(1000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        if (ContextCompat.checkSelfPermission(getActivity(),
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        }
    }
    
    @Override
    public void onConnectionSuspended(int i) {}
    
    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {}
    
    @Override
    public void onLocationChanged(Location location)
    {
        mLastLocation = location;
        if (mCurrLocationMarker != null) {
            mCurrLocationMarker.remove();
        }
    
        //Place current location marker
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("Current Position");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
    
        //move map camera
        mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,11));
    
    }
    
    public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
    private void checkLocationPermission() {
        if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
    
            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
                    Manifest.permission.ACCESS_FINE_LOCATION)) {
    
                // Show an explanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.
                new AlertDialog.Builder(getActivity())
                        .setTitle("Location Permission Needed")
                        .setMessage("This app needs the Location permission, please accept to use location functionality")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                //Prompt the user once explanation has been shown
                                ActivityCompat.requestPermissions(getActivity(),
                                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                                        MY_PERMISSIONS_REQUEST_LOCATION );
                            }
                        })
                        .create()
                        .show();
    
    
            } else {
                // No explanation needed, we can request the permission.
                ActivityCompat.requestPermissions(getActivity(),
                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                        MY_PERMISSIONS_REQUEST_LOCATION );
            }
        }
    }
    
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_LOCATION: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
    
                    // permission was granted, yay! Do the
                    // location-related task you need to do.
                    if (ContextCompat.checkSelfPermission(getActivity(),
                            Manifest.permission.ACCESS_FINE_LOCATION)
                            == PackageManager.PERMISSION_GRANTED) {
    
                        if (mGoogleApiClient == null) {
                            buildGoogleApiClient();
                        }
                        mGoogleMap.setMyLocationEnabled(true);
                    }
    
                } else {
    
                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(getActivity(), "permission denied", Toast.LENGTH_LONG).show();
                }
                return;
            }
    
            // other 'case' lines to check for other
            // permissions this app might request
        }
    }
    

    }

    由于Location权限请求需要经过Activity,所以需要将Activity的结果路由到Fragment的onRequestPermissionsResult()方法:

    公共类 MainActivity 扩展 AppCompatActivity {

    MapFragment mapFragment;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    
        mapFragment = new MapFragment();
    
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.add(R.id.mapframe, mapFragment);
        transaction.commit();
    }
    
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        if (requestCode == MapFragment.MY_PERMISSIONS_REQUEST_LOCATION){
            mapFragment.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
        else {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
    

    }

    布局只包含 MapFragment 所在的 FrameLayout。

    activity_main.xml:

    【讨论】:

      【解决方案3】:

      使用以下代码获取当前位置:

       @Override
          public void onMapReady(GoogleMap googleMap) {
      
      
           if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.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;
                      }
                      mMap.setMyLocationEnabled(true);
      }
      

      如果你想在当前位置添加标记试试这个:

      1.在您的活动中实现LocationListener

      2.更新位置请求:

      LocationRequest  mLocationRequest = new LocationRequest();
              mLocationRequest.setInterval(5000); //5 seconds
              mLocationRequest.setFastestInterval(3000); //3 seconds
              mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
      

      3.在onLocationChanged(Location location)上创建您的标记

              Geocoder geocoder;
              List<Address> addresses;
              geocoder = new Geocoder(this, Locale.getDefault());
      
      
      
              //place marker at current position
              //mGoogleMap.clear();
      
       Marker currLocationMarker;
      
              if (currLocationMarker != null) {
                  currLocationMarker.remove();
              }
      
              latLng = new LatLng(location.getLatitude(), location.getLongitude());
      
              MarkerOptions markerOptions = new MarkerOptions();
              markerOptions.position(latLng);
              markerOptions.title("Current Position.......");
              markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
             currLocationMarker = mMap.addMarker(markerOptions);
      
      }
      }
      

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