Develop Reference

How to get timezone based on current latitude and longitude?

I am getting current latitude and longitude in map box, I need current timezone based on current latitude and longitude.
For example.My device time is the USA but my location showing in India so I need India timezone.Can you please help me.
#Override
public void onLocationChanged(Location location) {
try {
mLatLng = new LatLng(location.getLatitude(), location.getLongitude());
Log.i("EE","mLatLngmLatLng"+mLatLng);
String time = new java.text.SimpleDateFormat("dd/MM/yyyy HH:mm:ss.SSS").format(location.getTime());
Log.i("EE","time----"+time);
Log.i("EE","vlocation.getTime()----"+location.getTime());
updateCamera();
if (mMarker != null) {
updateMarker();
}else{
addMarker();
}
} catch (Exception e) {
e.printStackTrace();
}

Get address by Geocoder and identify country, When you will get the country name It will be easy for you to identify the time Zone.
private void getAddressFromLocation(double latitude, double longitude) {
Geocoder geocoder = new Geocoder(this, Locale.ENGLISH);
try {
List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
if (addresses.size() > 0) {
Address fetchedAddress = addresses.get(0);
StringBuilder strAddress = new StringBuilder();
for (int i = 0; i < fetchedAddress.getMaxAddressLineIndex(); i++) {
strAddress.append(fetchedAddress.getAddressLine(i)).append(" ");
}
txtLocationAddress.setText(strAddress.toString());
} else {
txtLocationAddress.setText("Searching Current Address");
}
} catch (IOException e) {
e.printStackTrace();
printToast("Could not get address..!");
}
}

unable to get both latitude and longitude from address, I get one of them either latitude or longitude

I am working on an app which works with latitude and and longitude after a user input an address. I'm utilizing Geocoder to get the latitude and longitude from the Input address. But the issue is both are returned with associated address from the Geocoder but I'm only able to read one of them. following is the code I'm using:
Geocoder geocoder = new Geocoder(this);
List<Address> addresses;
double[] cordinates = new double[2];
try {
addresses = geocoder.getFromLocationName(locName, 1);
if (addresses.size() > 0) {
cordinates[0] = addresses.get(0).getLatitude();
cordinates[1] = addresses.get(0).getLongitude();//unable to get this one
return cordinates;
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
in the above cases I'm able to get latitude but unable to get the longitude. I known this after debugging. Now when I swap them like
cordinates[1] = addresses.get(0).getLongitude();
cordinates[0] = addresses.get(0).getLatitude();
Now I get Longitude but not the latitude.
what is the problem here?

This is working fine. Since you are debugging your code with breakpoints when it encounters the
return cordinates; it goes to
return null;
It only happens while debugging. It always returns the correct value. You can check returned values by inserting a log statement.
{
.....
double[] coordinates = getLongLat("Your address");
Log.wtf(TAG,"Lat:"+coordinates[0]+" Long:"+coordinates[1]);// This will log the correct values
.....
}
public double[] getLongLat(String address){
Geocoder geocoder = new Geocoder(this);
List<Address> addresses;
double[] cordinates = new double[2];
try {
addresses = geocoder.getFromLocationName(address, 1);
if (addresses.size() > 0) {
Address address1 = addresses.get(0);
cordinates[0] = address1.getLatitude();
cordinates[1] = address1.getLongitude();
return cordinates;
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

Try this working code :
AutoCompleteTextView acGooglePlaces = (AutoCompleteTextView) findViewById(R.id.ac_edit_my_event_places);
acGooglePlaces.setAdapter(new GooglePlacesAutocompleteAdapter(GooglePlaces.this, R.layout.auto_complete_text_layout));
acGooglePlaces.requestFocus();
btnSearch.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
try {
List<Address> returnedaddresses = geoCoder.getFromLocationName(acGooglePlaces.getText().toString(),1);
if(!returnedaddresses.isEmpty()){
String latForVol = String.valueOf(returnedaddresses.get(0).getLatitude());
String longForVol = String.valueOf(returnedaddresses.get(0).getLongitude());
Log.e("Lat", latForVol);
Log.e("Long", longForVol);
Log.e("Location", acGooglePlaces.getText().toString());
}else {
Log.e("Check", "Please give the correct address");
}
} catch (IOException e) {
e.printStackTrace();
}
}
});

public static LatLng reverseGeocoding(Context context, String locationName){
if(!Geocoder.isPresent()){
Log.w("zebia", "Geocoder implementation not present !");
}
Geocoder geoCoder = new Geocoder(context, Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocationName(locationName, 1);
} catch (IOException e) {
Log.d(Geocoding.class.getName(), "not possible finding LatLng for Address : " + locationName);
}
if(addresses.size() > 0){
Log.d("zebia", "reverse Geocoding : locationName " + locationName + "Latitude " + addresses.get(0).getLatitude() );
return new LatLng(addresses.get(0).getLatitude(), addresses.get(0).getLongitude());
}else{
//use http api
}
return null;
}

When find the latitude and longitude from address, how to give the address?

I follow this question (How can I find the latitude and longitude from address?) and try to get the latitude and longitude of an address. I call the method like this "GeoPoint point=getLocationFromAddress("colombo,sri lanka");" . but give null value. how to call method correctly??
public GeoPoint getLocationFromAddress(String strAddress){
Geocoder coder = new Geocoder(this);
List<Address> address;
GeoPoint p1 = null;
try {
address = coder.getFromLocationName(strAddress,5);
if (address==null) {
return null;
}
Address location=address.get(0);
location.getLatitude();
location.getLongitude();
p1 = new GeoPoint((int) (location.getLatitude() * 1E6),
(int) (location.getLongitude() * 1E6));
return p1;
}
}

In my opinion you should use google place autocomplete/place picker api's.
Select the place and thereafter you can get Latitude and Longitude.
Check this out:
https://developers.google.com/places/android-api/autocomplete

try below code
Geocoder gcd = new Geocoder(ReserveTimer.this, Locale.getDefault());
List<Address> addresses = gcd.getFromLocation(Double.parseDouble(lati), Double.parseDouble(longi), 1);
if (addresses.size() > 0) {
System.out.println(addresses.get(0).getLocality());
System.out.println(addresses.get(0).getCountryName());
System.out.println(addresses.get(0).getAddressLine(0));
System.out.println(addresses.get(0).getAdminArea());
System.out.println(addresses.get(0).getCountryName());
System.out.println(addresses.get(0).getPostalCode());
}

You can use the following method that take a Location object that contain latitud and longitud coordinates and Log the location to the LogCat console:
public void setLocation(Location loc) {
//Get Human readable address from latitud and longitud coordinates
if (loc.getLatitude() != 0.0 && loc.getLongitude() != 0.0) {
try {
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
List<Address> list = geocoder.getFromLocation(loc.getLatitude(), loc.getLongitude(), 1);
if (!list.isEmpty()) {
Address address = list.get(0);
Log.d(CLASS_TAG, "Mi direcci—n es: \n" + address.getAddressLine(0));
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

How to reverse Geocode in google maps api 2 android

I want to do reverse geocoding in my app using map api 2.But i dont know exactly how to do that?Any ideas?

Use Geocoder:
Geocoder geoCoder = new Geocoder(context);
List<Address> matches = geoCoder.getFromLocation(latitude, longitude, 1);
Address bestMatch = (matches.isEmpty() ? null : matches.get(0));

This is how it works for me..
MarkerOptions markerOptions;
Location myLocation;
Button btLocInfo;
String selectedLocAddress;
private GoogleMap myMap;
LatLng latLng;
LatLng tmpLatLng;
#Override
public void onMapLongClick(LatLng point) {
// Getting the Latitude and Longitude of the touched location
latLng = point;
// Clears the previously touched position
myMap.clear();
// Animating to the touched position
myMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
// Creating a marker
markerOptions = new MarkerOptions();
// Setting the position for the marker
markerOptions.position(latLng);
// Adding Marker on the touched location with address
new ReverseGeocodingTask(getBaseContext()).execute(latLng);
//tmpLatLng = latLng;
btLocInfo.setEnabled(true);
btLocInfo.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
double[] coordinates={tmpLatLng.latitude/1E6,tmpLatLng.longitude/1E6};
double latitude = tmpLatLng.latitude;
double longitude = tmpLatLng.longitude;
Log.i("selectedCoordinates", latitude + " " + longitude);
Log.i("selectedLocAddress", selectedLocAddress);
}
});
}
private class ReverseGeocodingTask extends AsyncTask<LatLng, Void, String>{
Context mContext;
public ReverseGeocodingTask(Context context){
super();
mContext = context;
}
// Finding address using reverse geocoding
#Override
protected String doInBackground(LatLng... params) {
Geocoder geocoder = new Geocoder(mContext);
double latitude = params[0].latitude;
double longitude = params[0].longitude;
List<Address> addresses = null;
String addressText="";
try {
addresses = geocoder.getFromLocation(latitude, longitude,1);
Thread.sleep(500);
if(addresses != null && addresses.size() > 0 ){
Address address = addresses.get(0);
addressText = String.format("%s, %s, %s",
address.getMaxAddressLineIndex() > 0 ? address.getAddressLine(0) : "",
address.getLocality(),
address.getCountryName());
}
}
catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
selectedLocAddress = addressText;
return addressText;
}
#Override
protected void onPostExecute(String addressText) {
// Setting the title for the marker.
// This will be displayed on taping the marker
markerOptions.title(addressText);
// Placing a marker on the touched position
myMap.addMarker(markerOptions);
}
}

You can do like this to get complete address :
public class MainActivity extends AppCompatActivity {
...
private Geocoder geocoder;
private TextView mAddressTxtVu;
...
// assume that you got latitude and longitude correctly
mLatitude = 20.23232
mLongitude = 32.999
String errorMessage = "";
geocoder = new Geocoder(context, Locale.getDefault());
List<Address> addresses = null;
try {
addresses = geocoder.getFromLocation(
mlattitude,
mlongitude,
1);
} catch (IOException e) {
errorMessage = getString(R.string.service_not_available);
Log.e(TAG, errorMessage, e);
} catch (IllegalArgumentException illegalArgumentException) {
// Catch invalid latitude or longitude values.
errorMessage = getString(R.string.invalid_lat_long_used);
Log.e(TAG, errorMessage + ". " + "Latitude = " + mlattitude +",
Longitude = " + mlongitude, illegalArgumentException);
}
// Handle case where no address was found.
if (addresses == null || addresses.size() == 0) {
if (errorMessage.isEmpty()) {
errorMessage = getString(R.string.no_address_found);
Log.e(TAG, errorMessage);
}
} else {
Address address = addresses.get(0);
ArrayList<String> addressFragments = new ArrayList<String>();
// Fetch the address lines using getAddressLine,
// join them, and send them to the thread.
for (int i = 0; i <= address.getMaxAddressLineIndex(); i++) {
addressFragments.add(address.getAddressLine(i));
}
// Log.i(TAG, getString(R.string.address_found));
mAddressTxtVu.setText(TextUtils.join(System.getProperty("line.separator"),
addressFragments));
}
Hope it helps!

You don't need to use Google Maps Api for this purpose. Android SKD have a class for it which you can simply use without any registration of API Key and so on. The class is android.location.Geocoder. It have methods for geocoding and reverse geocoding. I was looking in the source code of this class and found that it have a method android.location.Geocoder#getFromLocationName(java.lang.String, int) where first argument is address, and second is max number of results you want. It returns a List<Address>. The Address class have methods like android.location.Address#getLatitude and android.location.Address#getLongitude. They both return double.
Try it and let me know how good it is :-)

cannot get place from google map using location

I try to get place(ex: locality, country, postal code) form google map using
latitude and longitude. The following is my code that got null data:
Edit:
public void onLocationChanged(Location location) {
geocoder = new Geocoder(this, Locale.getDefault());
if (location != null) {
try {
addresses = geocoder.getFromLocation(location.getLatitude()/1E6,
location.getLongitude()/1E6, 1);
if (addresses.size() > 0) {
resultAddress = addresses.get(0);
locality = resultAddress.getLocality();
sublocality = resultAddress.getSubLocality();
postalcode = resultAddress.getPostalCode();
country = resultAddress.getCountryName();
adminarea = resultAddress.getSubAdminArea();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
I tried to assign latitude and longitude manually, but got nothing.
Any one can correct my mistakes ? Thank you

I think the problem is on the parameters of the method. I guess that location is a GeoPoint In that case, instead of
addresses = geocoder.getFromLocation(location.getLatitude(),
location.getLongitude(), 1);
try this:
addresses = geocoder.getFromLocation(location.getLatitude()/1E6,
location.getLongitude()/1E6, 1);
because the coordinates in a geopoint are represented in microdegrees
Edit
I copied your code and tried it. Assuming your "location" object is a GeoPoint, the code that works is as follows:
GeoPoint location = new GeoPoint(lat, lon);
if (location != null) {
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
try {
List<Address> addresses = geocoder.getFromLocation(location.getLatitudeE6()/1E6,
location.getLongitudeE6()/1E6, 1);
if (addresses.size() > 0) {
Address resultAddress = addresses.get(0);
String locality = resultAddress.getLocality();
String sublocality = resultAddress.getSubLocality();
String postalcode = resultAddress.getPostalCode();
String country = resultAddress.getCountryName();
String adminarea = resultAddress.getSubAdminArea();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
however, if you are testing it on the emulator, be sure you have internet connection. Otherwise, the method "getFromLocation" cannot find out the address and won't display anything. If you don't have any error in the logcat and the problem is only that nothing is displayed, that is the problem: no network.

Do you have the <uses-permission android:name="android.permission.INTERNET" /> in manifest.xml?