我想获取用户在 map 上的当前位置 当我运行该应用程序时，该应用程序已成功启动，它需要用户的许可才能通过 GPS 获取用户的位置，但 map 上未显示标记。
当我在模拟器上运行此应用程序时，它会显示其他位置，而当我在移动设备上运行此应用程序时，它不会显示位置(标记) 她就是密码。
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.GPS_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_SATELLITE);
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
Log.i("Location::::::", location.toString());
LatLng person = new LatLng(location.getLatitude(),location.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(person).title("person").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(person, 15));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
if(Build.VERSION.SDK_INT < 23){
locationManager.requestLocationUpdates(LocationManager.GPS_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.GPS_PROVIDER, 0, 0, locationListener);
Location lastLoc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
LatLng loc = new LatLng(lastLoc.getLatitude(), lastLoc.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(loc).title("person").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE)));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(loc, 15));
}
}
}
}
最佳答案
when i run the this app on emulator it shows some where else location
它不显示您当前的位置，因为在使用模拟器时，它的位置是在设置中设置的，它不能确定您的实际位置，所以基本上是手动设置的。
when i run this app on mobile it does not show location(marker)
关于这一点，您可以尝试先在onMapReady中直接调用addMarker。并将您的 onLocationChanged 回调移到 onMapReady 之外。
关于android - map 上不显示标记，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50432804/