我怎样才能找到Android设备的经纬度？
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【中文标题】我怎样才能找到Android设备的经纬度？【英文标题】：How can I cat latitude and longitude of Android device? 【发布时间】：2020-04-11 13:52:04 【问题描述】：所以我正在制作这个应用程序，它可以使用 JSoup 库查找您附近的餐馆，从送餐应用程序中获取信息。 唯一的问题是有时纬度和经度会得到空值。 我的应用程序正在运行的情况： - 打开 GPS 并等待至少 1-2 分钟； - 打开谷歌地图，关闭它，然后返回应用程序；
所以主要问题是：启用位置并点击“查找餐厅”按钮后，我无法立即获取位置，我需要在启用位置后等待 1-2 分钟，然后它才能工作。
private TextView result;
private FusedLocationProviderClient client;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
requestPermission();
client = LocationServices.getFusedLocationProviderClient(this);
getBtn = findViewById(R.id.getRestaurants);
result = findViewById(R.id.restaurantsList);
getBtn.setOnClickListener(this);
private void requestPermission()
ActivityCompat.requestPermissions(this, new String[]ACCESS_FINE_LOCATION, 1 );
public void onClick(View v)
if (ActivityCompat.checkSelfPermission(MainActivity.this, ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return;
client.getLastLocation().addOnSuccessListener(MainActivity.this, new OnSuccessListener<Location>()
@Override
public void onSuccess(Location location)
result.setText("Getting location...");
if(location != null)
double latitude = getLat(location);
double longitude = getLng(location);
result.setText("Finding restaurants near you...");
getWebsite(latitude, longitude);
else
result.setText("Couldn't fetch location!");
);
【问题讨论】：
【参考方案1】：这是在 Kotlin 中实现 FusedLocationProvider 的好方法（您可能会适应 Java 或同时使用 Java 和 Kotlin）：
private fun startLoc()
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
try
fusedLocationClient.lastLocation
.addOnSuccessListener location: Location? ->
//showDialog(this@MapsActivity, TAG, "last know loc = $location?.latitude + $location?.longitude")
if (location != null)
lastKnowLoc = LatLng(location.latitude, location.longitude)
addMarkerToLocation(lastKnowLoc)
val locationRequest = LocationRequest()
locationRequest.interval = 10000
locationRequest.fastestInterval = 10000
locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
locationCallback = object : LocationCallback()
override fun onLocationResult(locationResult: LocationResult?)
locationResult ?: return
for (location in locationResult.locations)
//showDialog(this@MapsActivity, "locationResult", "location=$location.latitude;$location.longitude")
addMarkerToLocation(LatLng(location.latitude, location.longitude))
val speed = location.speed
updateCamera(location.bearing)
fusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null)
btnStartLoc.isEnabled = false
btnStopLoc.isEnabled = true
catch (e:SecurityException)
【讨论】：
【参考方案2】：你必须使用requestLocationUpdates()
您正在使用getLastLocation()，并且当 GPS 关闭并在最后一个已知位置变为空后打开时，您必须致电 requestLocationUpdates()
您可以在下面的链接中找到更多信息
https://developer.android.com/training/location/receive-location-updates
【讨论】：
考虑发布代码作为答案而不是页面链接。【参考方案3】：创建一个 GPSTracker 类
public class GPSTracker extends Service implements LocationListener
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
boolean canGetLocation = false;
Location location; // location
double latitude=0.0; // latitude
double longitude=0.0; // longitude
// The minimum distance to change Updates in meters
//private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0;
// The minimum time between updates in milliseconds
//private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
private static final long MIN_TIME_BW_UPDATES = 0;
// 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 && !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();
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled)
if(latitude==0 || longitude==0)
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();
catch (Exception e)
e.printStackTrace();
return location;
/**
* Function to get latitude
* */
public double getLatitude()
if(location != null)
latitude = location.getLatitude();
// return latitude
return latitude;
/**
* Function to get longitude
* */
public double getLongitude()
if(location != null)
longitude = location.getLongitude();
// return longitude
return longitude;
public boolean canGetLocation()
return this.canGetLocation;
/**
* Function to show settings alert dialog
* */
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. Please go to settings menu and Switch it on");
// Setting Icon to Dialog
//alertDialog.setIcon(R.drawable.delete);
// 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
//not required comment by kp on 19-03-2017
/* 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)
// TODO Auto-generated method stub
latitude = location.getLatitude();
longitude = location.getLongitude();
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
// TODO Auto-generated method stub
@Override
public void onProviderEnabled(String provider)
// TODO Auto-generated method stub
@Override
public void onProviderDisabled(String provider)
// TODO Auto-generated method stub
@Override
public IBinder onBind(Intent intent)
// TODO Auto-generated method stub
return null;
您想在哪里获取 lat、long 值...使用实现 LocationListener 和下面的代码
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
// Creating an empty criteria object
Criteria criteria = new Criteria();
// Getting the name of the provider that meets the criteria
provider = locationManager.getBestProvider(criteria, false);
if(provider!=null && !provider.equals(""))
// Get the location from the given provider
Location location = locationManager.getLastKnownLocation(provider);
locationManager.requestLocationUpdates(provider, 20000, 1,BillingManual.this );
if(location!=null)
onLocationChanged(location);
else
//Toast.makeText(getBaseContext(), "No Provider Found", Toast.LENGTH_SHORT).show();
GPSTracker gps = new GPSTracker(this);
// check if GPS enabled
if(gps.canGetLocation())
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
latitude_1 = latitude;
longitude_1 =longitude;
// \n is for new line
// Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
else
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
@Override
public void onLocationChanged(Location location)
// TODO Auto-generated method stub
try
latitude_1=location.getLatitude();
longitude_1=location.getLongitude() ;
catch (Exception e)
e.printStackTrace();
// TODO: handle exception
【讨论】：
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