如何在谷歌地图android中获取当前位置
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时间：2020-08-20 04:31:29 来源:igfitidea点击:
how to get current location in google map android
提问by skyshine
Actually my problem is I am not getting current location latitude and longitude I tried so many ways.I know that this question already asked in SO I tried that answers also still I didn't get answer.Please help me Code:
实际上我的问题是我没有得到当前位置的纬度和经度我尝试了很多方法。我知道这个问题已经问过所以我也尝试了这些答案仍然没有得到答案。请帮我代码：
if (googleMap == null) {
googleMap = ((MapFragment) getFragmentManager().findFragmentById(
R.id.map)).getMap();
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getApplicationContext(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
googleMap.setMyLocationEnabled(true);
Location myLocation = googleMap.getMyLocation(); //Nullpointer exception.........
LatLng myLatLng = new LatLng(myLocation.getLatitude(),
myLocation.getLongitude());
CameraPosition myPosition = new CameraPosition.Builder()
.target(myLatLng).zoom(17).bearing(90).tilt(30).build();
googleMap.animateCamera(
CameraUpdateFactory.newCameraPosition(myPosition));
采纳答案by Shylendra Madda
Please check the sample code for the Google Maps Android API v2. Using this will solve your problem.
请检查Google Maps Android API v2的示例代码。使用它可以解决您的问题。
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
mMap.setMyLocationEnabled(true);
// Check if we were successful in obtaining the map.
if (mMap != null) {
mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location arg0) {
mMap.addMarker(new MarkerOptions().position(new LatLng(arg0.getLatitude(), arg0.getLongitude())).title("It's Me!"));
}
});
}
}
}
Call this function in onCreatefunction.
在onCreate函数中调用这个函数。
回答by Andrey
I think that better way now is:
我认为现在更好的方法是：
Location currentLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
回答by Sandeep Sankla
package com.example.sandeep.googlemapsample;
import android.content.pm.PackageManager;
import android.location.Location;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
GoogleMap.OnMarkerDragListener,
GoogleMap.OnMapLongClickListener,
GoogleMap.OnMarkerClickListener,
View.OnClickListener {
private static final String TAG = "MapsActivity";
private GoogleMap mMap;
private double longitude;
private double latitude;
private GoogleApiClient googleApiClient;
@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);
//Initializing googleApiClient
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
// googleMapOptions.mapType(googleMap.MAP_TYPE_HYBRID)
// .compassEnabled(true);
// Add a marker in Sydney and move the camera
LatLng india = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(india).title("Marker in India"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(india));
mMap.setOnMarkerDragListener(this);
mMap.setOnMapLongClickListener(this);
}
//Getting current location
private void getCurrentLocation() {
mMap.clear();
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;
}
Location location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
if (location != null) {
//Getting longitude and latitude
longitude = location.getLongitude();
latitude = location.getLatitude();
//moving the map to location
moveMap();
}
}
private void moveMap() {
/**
* Creating the latlng object to store lat, long coordinates
* adding marker to map
* move the camera with animation
*/
LatLng latLng = new LatLng(latitude, longitude);
mMap.addMarker(new MarkerOptions()
.position(latLng)
.draggable(true)
.title("Marker in India"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
mMap.getUiSettings().setZoomControlsEnabled(true);
}
@Override
public void onClick(View view) {
Log.v(TAG,"view click event");
}
@Override
public void onConnected(@Nullable Bundle bundle) {
getCurrentLocation();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onMapLongClick(LatLng latLng) {
// mMap.clear();
mMap.addMarker(new MarkerOptions().position(latLng).draggable(true));
}
@Override
public void onMarkerDragStart(Marker marker) {
Toast.makeText(MapsActivity.this, "onMarkerDragStart", Toast.LENGTH_SHORT).show();
}
@Override
public void onMarkerDrag(Marker marker) {
Toast.makeText(MapsActivity.this, "onMarkerDrag", Toast.LENGTH_SHORT).show();
}
@Override
public void onMarkerDragEnd(Marker marker) {
// getting the Co-ordinates
latitude = marker.getPosition().latitude;
longitude = marker.getPosition().longitude;
//move to current position
moveMap();
}
@Override
protected void onStart() {
googleApiClient.connect();
super.onStart();
}
@Override
protected void onStop() {
googleApiClient.disconnect();
super.onStop();
}
@Override
public boolean onMarkerClick(Marker marker) {
Toast.makeText(MapsActivity.this, "onMarkerClick", Toast.LENGTH_SHORT).show();
return true;
}
}
回答by Andrew Puglionesi
If you don't need to retrieve the user's location every time it changes (I have no idea why nearly every solution does that by using a location listener), it's just wasteful to do so. The asker was clearly interested in retrieving the location just once. Now FusedLocationApi is deprecated, so as a replacement for @Andrey's post, you can do:
如果您不需要在每次更改时检索用户的位置（我不知道为什么几乎每个解决方案都使用位置侦听器来这样做），那么这样做只是浪费。询问者显然有兴趣只检索一次位置。现在 FusedLocationApi 已弃用，因此作为 @Andrey 帖子的替代品，您可以执行以下操作：
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
String locationProvider = LocationManager.NETWORK_PROVIDER;
// I suppressed the missing-permission warning because this wouldn't be executed in my
// case without location services being enabled
@SuppressLint("MissingPermission") android.location.Location lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
double userLat = lastKnownLocation.getLatitude();
double userLong = lastKnownLocation.getLongitude();
This just puts together some scattered information in the docs, thisbeing the most important source.
这只是将文档中的一些零散信息放在一起，这是最重要的来源。
回答by Prateek Diwedi
This Code in MapsActivityClass works for me :
MapsActivity课堂中的此代码对我有用：
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;
public void centreMapOnLocation(Location location, String title){
LatLng userLocation = new LatLng(location.getLatitude(),location.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(userLocation).title(title));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation,12));
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
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);
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
centreMapOnLocation(lastKnownLocation,"Your Location");
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps2);
// 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);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
Intent intent = getIntent();
if (intent.getIntExtra("Place Number",0) == 0 ){
// Zoom into users location
locationManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
centreMapOnLocation(location,"Your Location");
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
};
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
centreMapOnLocation(lastKnownLocation,"Your Location");
} else {
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},1);
}
}
}
}
回答by Karishma bhardwaj
Location locaton;
private GoogleMap mMap;
@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);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = 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) {
return;
}
mMap.setMyLocationEnabled(true);
mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location location) {
CameraUpdate center = CameraUpdateFactory.newLatLng(new LatLng(location.getLatitude(), location.getLongitude()));
CameraUpdate zoom = CameraUpdateFactory.zoomTo(11);
mMap.clear();
MarkerOptions mp = new MarkerOptions();
mp.position(new LatLng(location.getLatitude(), location.getLongitude()));
mp.title("my position");
mMap.addMarker(mp);
mMap.moveCamera(center);
mMap.animateCamera(zoom);
}
});}}
回答by worawee.s
Your current location might not be available immediately, after the map fragment is initialized.
在地图片段初始化后，您的当前位置可能无法立即使用。
After set
设置后
googleMap.setMyLocationEnabled(true);
you have to wait until you see the blue dot shown on your MapView. Then
您必须等到您看到 MapView 上显示的蓝点。然后
Location myLocation = googleMap.getMyLocation();
myLocation won't be null.
myLocation 不会为空。
I think you better use the LocationClientinstead, and implement your own LocationListener.onLocationChanged(Location l)
我认为你最好使用LocationClient代替，并实现你自己的 LocationListener.onLocationChanged(Location l)
Receiving Location Updateswill show you how to get current location from LocationClient
接收位置更新将向您展示如何从 LocationClient 获取当前位置
回答by jojo
public void getMyLocation() {
// create class object
gps = new GPSTracker(HomeActivity.this);
// check if GPS enabled
if (gps.canGetLocation()) {
latitude = gps.getLatitude();
longitude = gps.getLongitude();
Geocoder geocoder;
List<Address> addresses;
geocoder = new Geocoder(this, Locale.getDefault());
try {
addresses = geocoder.getFromLocation(latitude, longitude, 1);
postalCode = addresses.get(0).getPostalCode();
city = addresses.get(0).getLocality();
address = addresses.get(0).getAddressLine(0);
state = addresses.get(0).getAdminArea();
country = addresses.get(0).getCountryName();
knownName = addresses.get(0).getFeatureName();
Log.e("Location",postalCode+" "+city+" "+address+" "+state+" "+knownName);
} catch (IOException e) {
e.printStackTrace();
}
} else {
gps.showSettingsAlert();
}
}
回答by Yuan Fu
FusedLocationApihas been Deprecated(Why Google always deprecated everything!)
FusedLocationApi一直Deprecated（为什么谷歌总是弃用一切！）
Here is the way to get it now:
这是现在获得它的方法：
private lateinit var fusedLocationClient: FusedLocationProviderClient
override fun onCreate(savedInstanceState: Bundle?) {
// ...
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
}
回答by Abu Bakar Kaleem
All solution mentioned above using that code which are deprecated now!Here is the new solution
上面提到的所有使用该代码的解决方案现在已弃用！这是新的解决方案
Add implementation 'com.google.android.gms:play-services-places:15.0.1' dependency in your gradle file
Add network permission in your manifest file:
在您的 gradle 文件中添加实现 'com.google.android.gms:play-services-places:15.0.1' 依赖项
在清单文件中添加网络权限：
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
Now use this code to get current location
FusedLocationProviderClient mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this); mFusedLocationClient.getLastLocation().addOnSuccessListener(new OnSuccessListener<Location>() { @Override public void onSuccess(Location location) { // GPS location can be null if GPS is switched off currentLat = location.getLatitude(); currentLong = location.getLongitude(); Toast.makeText(HomeNavigationBarActivtiy.this, "lat " + location.getLatitude() + "\nlong " + location.getLongitude(), Toast.LENGTH_SHORT).show(); } }) .addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { e.printStackTrace(); } });
现在使用此代码获取当前位置
FusedLocationProviderClient mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this); mFusedLocationClient.getLastLocation().addOnSuccessListener(new OnSuccessListener<Location>() { @Override public void onSuccess(Location location) { // GPS location can be null if GPS is switched off currentLat = location.getLatitude(); currentLong = location.getLongitude(); Toast.makeText(HomeNavigationBarActivtiy.this, "lat " + location.getLatitude() + "\nlong " + location.getLongitude(), Toast.LENGTH_SHORT).show(); } }) .addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { e.printStackTrace(); } });
