每当我运行我的Android代码并且我的地图在我的真实设备上打开（而不是在模拟器上）时，它就不会指向任何地方，它只是显示缩小的世界地图而不是用户的位置。我尝试了各种各样的组合来做到这一点，没有任何帮助我。
下面是我尝试获取用户的代码，但行为仍然保持不变。我尝试将GPS_SERVICE更改为NETWORK_PROVIDER但仍无法提供帮助。这可能是什么解决方案？
我在这里测试的设备是One Plus 3。
的Manifest.xml：
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
MapsActivity：
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(requestCode == 1) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
// Add a marker on user's location and move the camera.
LatLng yourLocation = new LatLng(location.getLatitude(), location.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(yourLocation).title("Your Location"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(yourLocation));
// To get the address of the user location.
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
try {
// 1 - represents only one location is required.
List<Address> listAddresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
if(listAddresses != null && listAddresses.size() > 0) {
Log.i("PlaceInfo", listAddresses.get(0).toString());
String address = "";
if(listAddresses.get(0).getSubThoroughfare() != null) {
address += listAddresses.get(0).getSubThoroughfare() + " ";
}
if(listAddresses.get(0).getThoroughfare() != null) {
address += listAddresses.get(0).getThoroughfare() + ", ";
}
if(listAddresses.get(0).getLocality() != null) {
address += listAddresses.get(0).getLocality() + ", ";
}
if(listAddresses.get(0).getPostalCode() != null) {
address += listAddresses.get(0).getPostalCode() + ", ";
}
if(listAddresses.get(0).getCountryName() != null) {
address += listAddresses.get(0).getCountryName();
}
Toast.makeText(MapsActivity.this, address, Toast.LENGTH_LONG).show();
Log.i("address", address);
}
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
};
if(Build.VERSION.SDK_INT < 23) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
}
else {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
} else {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
// Get the users's current location.
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
LatLng yourLocation = new LatLng(lastKnownLocation.getLatitude(), lastKnownLocation.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(yourLocation).title("Your Location"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(yourLocation));
}
}
}
}