我可以手动获取当前位置，但我想在Android应用程序中以编程方式获取它。我正在使用LocationListener和LocationManager，但我没有在地图上获取当前位置。我的代码如下，任何人都可以指导我如何做到这一点？
package com.example.nabia.myapplication;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
public class FindNearbyMosque extends AppCompatActivity implements LocationListener, OnMapReadyCallback {
MapView gMapView;
GoogleMap gMap = null;
double latitude;
double longitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_find_nearby_mosque);
LocationManager myManager;
myManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
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;
}
myManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
gMapView = (MapView)findViewById(R.id.map);
gMapView.getMapAsync(this);
gMapView.onCreate(savedInstanceState);
gMapView.onResume(); // needed to get the map to display immediately
try {
MapsInitializer.initialize(this.getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onMapReady(GoogleMap map) {
gMap = map;
gMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
}
@Override
public void onLocationChanged(Location location) {
latitude = location.getLatitude();
longitude = location.getLongitude();
gMap.moveCamera( CameraUpdateFactory.newLatLngZoom(new LatLng(latitude,longitude) , 14.0f) );
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}
答案 0 :(得分：1)
我已将LocationServices与GoogleApiClient()联系起来解决了我的问题，如下面的代码所示。
public class FindNearbyMosque extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
private static final int GPS_ERRORDIALOG_REQUEST = 9001;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
GoogleMap mMap;
double lat;
double lng;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (servicesOK()) {
setContentView(R.layout.activity_map);
if (initMap()) {
Toast.makeText(this, "Ready to map!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Map not available!", Toast.LENGTH_SHORT).show();
}
} else {
setContentView(R.layout.activity_find_nearby_mosque);
}
}
private boolean servicesOK() {
GoogleApiAvailability googleAPI = GoogleApiAvailability.getInstance();
int isAvailable = googleAPI.isGooglePlayServicesAvailable(this);
if (isAvailable == ConnectionResult.SUCCESS) {
return true;
} else if (googleAPI.isUserResolvableError(isAvailable)) {
Dialog dialog = googleAPI.getErrorDialog(this, isAvailable, GPS_ERRORDIALOG_REQUEST);
dialog.show();
} else {
Toast.makeText(this, "Can't connect to google play services", Toast.LENGTH_SHORT).show();
}
return false;
}
private boolean initMap() {
SupportMapFragment mapFragment =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
return (true);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
buildGoogleApiClient();
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(@Nullable Bundle bundle) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, 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;
}
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
lat = mLastLocation.getLatitude();
lng = mLastLocation.getLongitude();
LatLng loc = new LatLng(lat, lng);
CameraUpdate center=
CameraUpdateFactory.newLatLng(loc);
CameraUpdate zoom=CameraUpdateFactory.newLatLngZoom(loc,14);
mMap.moveCamera(center);
mMap.animateCamera(zoom);
mMap.addMarker(new MarkerOptions().position(loc).title("New Marker"));
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}