In the Android Developer guide, Google showed how to use the Google Play Services API in an activity class. What is the best way to offload the API calls into a separate class?
public class GPSresource implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private Location location; // location
private double latitude; // latitude
private double longitude; // longitude
private GoogleApiClient mGAC;
private Context mContext;
public static final String TAG = "GPSresource";
public GPSresource(Context c)
{
mContext = c;
try {
buildGoogleApiClient();
mGAC.connect();
}
catch(Exception e)
{
Log.d(TAG,e.toString());
}
}
protected synchronized void buildGoogleApiClient() {
mGAC = new GoogleApiClient.Builder(mContext)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
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;
}
#Override
public void onConnected(Bundle bundle) {
location = LocationServices.FusedLocationApi.getLastLocation(mGAC);
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
}
The code I wrote above does not work since onConnected is never called since this is not an activity. Is there a better way to separate the GPS services from the Main Activity or is that the only option(If so, is there a reason as to why?) Perhaps making a thread in the main activity to run in the background?
Thanks!
onConnected is called, I made a mistake with reading the logs!
Here is an example :
public class LocationManager implements LocationListener {
private LocationManager locationManager;
public LocationManager()
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (locationManager.getAllProviders().contains(LocationManager.GPS_PROVIDER))
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
if (locationManager.getAllProviders().contains(LocationManager.NETWORK_PROVIDER))
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
Location mobileLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (mobileLocation != null)
{
onLocationChanged(mobileLocation);
}
Location netLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (netLocation != null)
{
onLocationChanged(netLocation);
}
}
#Override
public void onLocationChanged(Location loc) {
String longitude = "Longitude: " + loc.getLongitude();
//Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
// Log.v(TAG, latitude);
/*------- To get city name from coordinates -------- */
String cityName = null;
Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
// Log.e(TAG, "addr : " + addresses.toString());
if (addresses.size() > 0)
cityName = addresses.get(0).getLocality();
}
catch (IOException e) {
e.printStackTrace();
}
String s = longitude + "\n" + latitude + "\n\nMy Current City is: " + cityName;
Log.e(TAG, "location : " + s);
}
#Override
public void onProviderDisabled(String provider) {
Log.d("Latitude", "disable");
}
#Override
public void onProviderEnabled(String provider) {
Log.d("Latitude","enable");
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.d("Latitude","status");
}
public void pause() {
if (locationManager != null)
{
locationManager.removeUpdates(this);
locationManager = null;
}
}
public void destroy() {
if (locationManager != null)
{
locationManager.removeUpdates(this);
locationManager = null;
}
}
}
Related
I am beginner in android. I am now learning dagger 2 dependency injection. I am coding an app which update the latitude and longitude to the textview screen. I don't know, how i would I update the location coordinates to the textview screen as i did the coding of onLocationChanged in the module class and I am injecting the class to the main activity.
I did the coding of getting the location update in LocationManager class.
I can show the updated coordinates using toast, but not able to change textview, is there any way to do this ?
The code in the main activity
public class MainActivity extends AppCompatActivity {
#Inject
LocationManager locationManager;
#InjectView(R.id.textView2)
TextView addressLocation;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.inject(this);
MyApplication.inject(this);
locationManager.GetLocation();
}
}
I like to update the addressLocation textview with the coordinates that i am getting from LocationListener.
package com.test.xyz.daggersample1.service.impl;
public class LocationManager {
Geocoder geocoder;
List<Address> addresses;
private double lattitude = 0;
private double longitude = 0;
private Context context;
public LocationManager(Context context) {
this.context = context;
}
public String GetLocation() {
final String[] address = new String[1];
android.location.LocationManager locationManager = (android.location.LocationManager) context.getSystemService(LOCATION_SERVICE);
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return "";
}
geocoder = new Geocoder(context, Locale.getDefault());
LocationListener listener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
longitude = location.getLongitude();
lattitude = location.getLatitude();
// dialog.dismiss();
Toast.makeText(context, "Got the Longitude as " + longitude + " Lattitude as " + lattitude, Toast.LENGTH_SHORT).show();
**I like to pass these location values to the textview in the main activity**
try {
addresses = geocoder.getFromLocation(lattitude, longitude, 1);
address[0] = addresses.get(0).getAddressLine(0);
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(context, "Got the Longitude as " + longitude + " Lattitude as " + lattitude, Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
context.startActivity(i);
}
};
locationManager.requestLocationUpdates(android.location.LocationManager.GPS_PROVIDER, 2000, 10, listener);
return address[0];
}
}
My project folder
I actually wrote the below code on the onclick method of a button,but it is giving null pointer exception,plzz help
public void submit(View v)
{
LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location= locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
double mesg1=location.getLatitude();
double mesg2=location.getLongitude();
}
http://developer.android.com/reference/android/location/LocationManager.html
You should register a listener for location updates - see requestLocationUpdates() method.
Also add ACCESS_FINE_LOCATION permission to your Manifest.
hey follows few steps to get proper and accurate current location.
This way provided you current location both by interent as well as gps.
Step 1.
Put this class in your code.
GetCurLocation.java
public class GetCurLocation implements LocationListener,
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener {
public static LocationClient mLocationClient;
LocationRequest mLocationRequest;
public static LocationManager locationmanager;
float accuracy = 500;
Activity context;
boolean getLocRegularly = false;
int interval = 1000;
float Radius;
GoogleMap gmap;
SetOnLocationFoundListner OLF;
public interface SetOnLocationFoundListner {
public void onLocationFound(Location location, boolean getLocRegularly,
GoogleMap gmap);
}
public void RemoveUpdates() {
try {
if (mLocationClient != null)
mLocationClient.removeLocationUpdates(this);
if (locationmanager != null)
locationmanager.removeUpdates(LocUpByLocMgr);
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* radius should be in meters
*/
public GetCurLocation(Activity activity, int interval,
boolean getLocRegularly, GoogleMap gmap,
SetOnLocationFoundListner OLF, float Radius) {
this.OLF = OLF;
this.gmap = gmap;
this.context = activity;
this.getLocRegularly = getLocRegularly;
this.interval = interval;
this.Radius = Radius;
if (servicesConnected()) {
mLocationClient = new LocationClient(context, this, this);
mLocationClient.connect();
mLocationRequest = LocationRequest.create();
mLocationRequest.setInterval(interval);
mLocationRequest
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setFastestInterval(interval);
}
locationmanager = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
Criteria cr = new Criteria();
String provider = locationmanager.getBestProvider(cr, true);
locationmanager.requestLocationUpdates(provider, interval, 0,
LocUpByLocMgr);
}
private boolean servicesConnected() {
int resultCode = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(context);
if (ConnectionResult.SUCCESS == resultCode) {
return true;
} else {
Dialog dialog = GooglePlayServicesUtil.getErrorDialog(resultCode,
(Activity) context, 0);
if (dialog != null) {
}
return false;
}
}
#Override
public void onConnectionFailed(ConnectionResult result) {
}
#Override
public void onConnected(Bundle connectionHint) {
try {
Location location = mLocationClient.getLastLocation();
Log.e("testing",
location.getLatitude() + "," + location.getLongitude()
+ "," + location.getAccuracy());
if (location.getAccuracy() < Radius) {
OLF.onLocationFound(location, getLocRegularly, gmap);
locationmanager.removeUpdates(LocUpByLocMgr);
} else
mLocationClient.requestLocationUpdates(mLocationRequest, this);
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public void onDisconnected() {
}
#Override
public void onLocationChanged(Location location) {
try {
if (location.getAccuracy() > Radius) {
Log.e("testing LC", location.getAccuracy()
+ " Its Not Accurate");
} else {
Log.e("testing LC", location.getAccuracy() + " Its Accurate");
try {
OLF.onLocationFound(location, getLocRegularly, gmap);
if (!getLocRegularly) {
mLocationClient.removeLocationUpdates(this);
locationmanager.removeUpdates(LocUpByLocMgr);
}
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
android.location.LocationListener LocUpByLocMgr = new android.location.LocationListener() {
#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 void onLocationChanged(Location location) {
try {
if (location.getAccuracy() > Radius) {
Log.e("testing LM", location.getAccuracy()
+ " Its Not Accurate");
} else {
Log.e("testing LM", location.getAccuracy()
+ " Its Accurate");
try {
OLF.onLocationFound(location, getLocRegularly, gmap);
if (!getLocRegularly) {
mLocationClient
.removeLocationUpdates(GetCurLocation.this);
locationmanager.removeUpdates(LocUpByLocMgr);
}
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
}
Step 2.
implement setonlocationfoundlistener in class where you want current location,
and declear one more method in your oncreate and after you will get one location found method and it return location and you can get location.getlatitude and location.getlongitude.
GetCurLocation gcl = new GetCurLocation(activity, 0, true, null, this,
2000);
Step 3. make permission
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
thats all. thanks
public void loc1(View v)
{
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
String longitude = String.valueOf(location.getLongitude());
String latitude = String.valueOf(location.getLatitude());
Toast.makeText(getApplicationContext(), "latitude",Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "longitude",Toast.LENGTH_LONG).show();
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
public void onProviderEnabled(String provider) {
}
public void onProviderDisabled(String provider) {
}
};
// getting GPS status
boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// check if GPS enabled
if (isGPSEnabled) {
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
String longitude = String.valueOf(location.getLongitude());
String latitude = String.valueOf(location.getLatitude());
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
} else {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
String longitude = String.valueOf(location.getLongitude());
String latitude = String.valueOf(location.getLatitude());
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
} else {
String longitude = "0.00";
String latitude = "0.00";
}
}
}
}
I am using GPS to get longitude and latitude of a location, but now I want to get each and every detail of location like: country, city, state, zip code, street number and so on.
Maximum details of current location.
Code:
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;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
String country;
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// 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;
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 (location == null) {
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;
}
private void initmainIntent() {
LocationResult locationResult = new LocationResult() {
#Override
public void gotLocation(Location location) {
if (location != null) {
Geocoder gcd = new Geocoder(getApplicationContext(),
Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(location.getLatitude(),
location.getLongitude(), 1);
if (addresses.size() > 0) {
String s = "Address Line: "
+ addresses.get(0).getAddressLine(0) + "\n"
+ addresses.get(0).getFeatureName() + "\n"
+ "Locality: "
+ addresses.get(0).getLocality() + "\n"
+ addresses.get(0).getPremises() + "\n"
+ "Admin Area: "
+ addresses.get(0).getAdminArea() + "\n"
+ "Country code: "
+ addresses.get(0).getCountryCode() + "\n"
+ "Country name: "
+ addresses.get(0).getCountryName() + "\n"
+ "Phone: " + addresses.get(0).getPhone()
+ "\n" + "Postbox: "
+ addresses.get(0).getPostalCode() + "\n"
+ "SubLocality: "
+ addresses.get(0).getSubLocality() + "\n"
+ "SubAdminArea: "
+ addresses.get(0).getSubAdminArea() + "\n"
+ "SubThoroughfare: "
+ addresses.get(0).getSubThoroughfare()
+ "\n" + "Thoroughfare: "
+ addresses.get(0).getThoroughfare() + "\n"
+ "URL: " + addresses.get(0).getUrl();
locationNotFound.setVisibility(View.GONE);
locationFound.setVisibility(View.VISIBLE);
foundLocationText.setText(s);
}
} catch (IOException e) {
e.printStackTrace();
}
background(location.getLatitude(), location.getLongitude());
}
}
};
MyLocation myLocation = new MyLocation();
myLocation.getLocation(this, locationResult);
}
public class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled = false;
boolean network_enabled = false;
public boolean getLocation(Context context, LocationResult result) {
// I use LocationResult callback class to pass location value from
// MyLocation to user code.
locationResult = result;
if (lm == null)
lm = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
// exceptions will be thrown if provider is not permitted.
try {
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
} catch (Exception ex) {
}
try {
network_enabled = lm
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
} catch (Exception ex) {
}
// don't start listeners if no provider is enabled
if (!gps_enabled && !network_enabled)
return false;
if (gps_enabled)
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
locationListenerGps);
if (network_enabled)
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
locationListenerNetwork);
timer1 = new Timer();
timer1.schedule(new GetLastLocation(), 20000);
return true;
}
LocationListener locationListenerGps = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerNetwork);
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
LocationListener locationListenerNetwork = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
if (location != null) {
System.out.println(location.getLatitude());
}
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerGps);
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
class GetLastLocation extends TimerTask {
#Override
public void run() {
lm.removeUpdates(locationListenerGps);
lm.removeUpdates(locationListenerNetwork);
Location net_loc = null, gps_loc = null;
if (gps_enabled)
gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (network_enabled)
net_loc = lm
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
// if there are both values use the latest one
if (gps_loc != null && net_loc != null) {
if (gps_loc.getTime() > net_loc.getTime())
locationResult.gotLocation(gps_loc);
else
locationResult.gotLocation(net_loc);
return;
}
if (gps_loc != null) {
locationResult.gotLocation(gps_loc);
return;
}
if (net_loc != null) {
locationResult.gotLocation(net_loc);
return;
}
locationResult.gotLocation(null);
}
}
public static abstract class LocationResult {
public abstract void gotLocation(Location location);
}
}
Here is the Tutorial to Get Current location and City name using GPS
Once you get GPS co-ordinates
By using Geocoder class you can every details
See below code snip is for getting Current City Same way you can go for other details also.
private class MyLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location loc) {
editLocation.setText("");
pb.setVisibility(View.INVISIBLE);
Toast.makeText(
getBaseContext(),
"Location changed : Lat: " + loc.getLatitude() + " Lng: "
+ loc.getLongitude(), Toast.LENGTH_SHORT).show();
String longitude = "Longitude: " + loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(TAG, latitude);
/*----------to get City-Name from coordinates ------------- */
String cityName = null;
Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
if (addresses.size() > 0)
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getLocality();
} catch (IOException e) {
e.printStackTrace();
}
String s = longitude + "\n" + latitude + "\n\nMy Currrent City is: "
+ cityName;
editLocation.setText(s);
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
Update (as per comment)
If you want to send this details to any contact via SMS.
I would say this page may help you
Using this code you can find the address like street, State, Country and Pin.
Geocoder geoCoder = new Geocoder(context, Locale.getDefault());
List<Address> addresses = geoCoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
String address = "";
if (addresses != null && addresses.size() >= 0) {
address = addresses.get(0).getAddressLine(0);
if (addresses != null && addresses.size() >= 1) {
address += ", " + addresses.get(0).getAddressLine(1);
}
if (addresses != null && addresses.size() >= 2) {
address += ", " + addresses.get(0).getAddressLine(2);
}
}
And you need to run this code in separate thread or in AsyncTask because it will internally call the network connection.
I somehow spent many hours to complete this task. In the below code the onMapReady device location is detected and shows a marker at that location. On click on the marker the location address is shown.
public class StoreFinder extends FragmentActivity implements
OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private GoogleMap mMap;
private GoogleApiClient googleApiClient;
private LocationRequest locationRequest;
private Location lastLocation;
private Marker currentUserLocationMarker;
private static final int Request_User_Location_Code = 99;
private double latitude;
double longitude;
private int ProximityRadius = 10000;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_location);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
{
checkUserLocationPermission();
}
// 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 (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
{
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
public boolean checkUserLocationPermission()
{
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.ACCESS_FINE_LOCATION))
{
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, Request_User_Location_Code);
}
else
{
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, Request_User_Location_Code);
}
return false;
}
else
{
return true;
}
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults)
{
switch (requestCode)
{
case Request_User_Location_Code:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
{
if (googleApiClient == null)
{
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
}
else
{
Toast.makeText(this, "Permission Denied...", Toast.LENGTH_SHORT).show();
}
return;
}
}
protected synchronized void buildGoogleApiClient()
{
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
googleApiClient.connect();
}
#Override
public void onLocationChanged(Location location)
{
latitude = location.getLatitude();
longitude = location.getLongitude();
lastLocation = location;
if (currentUserLocationMarker != null)
{
currentUserLocationMarker.remove();
}
/*----------to get City-Name from coordinates ------------- */
String cityName = null;
Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(latitude, latitude, 1);
if (addresses.size() > 0)
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getAddressLine(0);
} catch (IOException e) {
e.printStackTrace();
}
String s = cityName;
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title(s);
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
currentUserLocationMarker = mMap.addMarker(markerOptions);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomBy(16));
if (googleApiClient != null)
{
LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, this);
}
}
#Override
public void onConnected(#Nullable Bundle bundle)
{
locationRequest = new LocationRequest();
locationRequest.setInterval(1100);
locationRequest.setFastestInterval(1100);
locationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
{
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, (LocationListener) this);
}
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
}
}
I try to add a location from the GPS but i always get null. Can you please help and show me what I did wrong?
I would like to always receive the location in onCreate. If no location is received
"No provider received" appears instead of the location. The problem is i always get the message.
//Location variables
private TextView gps;
private LocationManager locationManager;
private String locationProvider;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload_draw);
initializeData();
}
private void initializeData()
{
gps = (TextView) findViewById(R.id.GPS);
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
locationProvider = locationManager.getBestProvider(new Criteria(), true);
if(locationProvider!=null)
{
gps.setText("Upload image location: "+ locationProvider);
}
else
{
gps.setText("Upload image location: No provider Found" );
}
}
#Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
private void showLocation(Location location)
{
if(location==null)
gps.append("\nUnknown location");
else
{
double lat = location.getLatitude();
double lng = location.getLongitude();
gps.append("\n\nLocation lat: " +lat+
", long: " + lng+"\n"
+ getAddress(lat, lng));
}
}
public void onLocationChanged(Location location) {
showLocation(location);
}
public void onProviderDisabled(String provider) {
gps.append("\nProvider Disabled: " +provider);
}
public void onProviderEnabled(String provider) {
gps.append("\nProvider Enabled: " +provider);
}
public void onStatusChanged(String provider, int status, Bundle extras) {
gps.append("\nProvider Status Changed: " + provider+ ",status: "+
status);
}
public String getAddress(double lat, double lng)
{
Geocoder geocoder = new Geocoder(this);
try {
List<Address> addresses = geocoder.getFromLocation(lat, lng, 1);
Address obj = addresses.get(0);
String str = obj.getCountryName();
str+="\n" + obj.getCountryCode();
str+="\n" + obj.getLocality(); //current city
str+="\n" + obj.getAddressLine(0);
return str;
}
catch (IOException e) {
return "Error: " +e.getMessage();
}
}
1)You need to request updates from provider:
newLocation = requestUpdatesFromProvider(
LocationManager.GPS_PROVIDER, "error string");
2)Register a Listener:
LocationListener listener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
//Do something
} );}
i want to listen to both GPS and NETWORK location provider from the same listener and implementation
is this ok for doing that:
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,metersToUpdate,this);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,0,metersToUpdate,this);
will it user the same methods for both providers ?
Google says here:
You can also request location updates from both the GPS and the Network Location Provider by calling requestLocationUpdates() twice—once for NETWORK_PROVIDER and once for GPS_PROVIDER.
It's simple as 1.2.3 look at my example...
try {
Criteria criteria = new Criteria();
mLocationManagerHelper.SetLocationManager((LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE));
mLocationManagerHelper.GetLocationManager().requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L, 500.0f, mLocationManagerHelper.GetLocationListener());
String provider = mLocationManagerHelper.GetLocationManager().getBestProvider(criteria, false);
Location location = mLocationManagerHelper.GetLocationManager().getLastKnownLocation(provider);
if (location != null) {
mLongitude = location.getLongitude();
mLatitude = location.getLatitude();
}
} catch (Exception ex) {
Log.e(TAG, "GPS", ex);
}
Location helper
public class LocationManagerHelper {
private static final String TAG = LocationManagerHelper.class.getSimpleName();
private Context mContext;
private LocationManager mLocationManager;
private GeoUpdateHandler mLocationListener = new GeoUpdateHandler();
public LocationManagerHelper(Context context) {
this.mContext = context;
}
public GeoUpdateHandler GetLocationListener() {
return mLocationListener;
}
public void SetLocationManager(LocationManager locationManager) {
mLocationManager = locationManager;
}
public LocationManager GetLocationManager() {
return mLocationManager;
}
public void Stop() {
if (mLocationManager != null) {
mLocationManager.removeUpdates(mLocationListener);
}
}
private class GeoUpdateHandler implements LocationListener {
#Override
public void onLocationChanged(Location loc) {
String longitude = "Longitude: " + loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(TAG, latitude);
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
}
}
}
Google provides a better API, using fused location API:
https://developers.google.com/location-context/fused-location-provider/
https://developers.google.com/android/reference/com/google/android/gms/location/FusedLocationProviderClient
https://developer.android.com/training/location/receive-location-updates
https://github.com/sakurabird/Android-Fused-location-provider-example
https://youtu.be/eHjHlujp3Tg?list=WL&t=2129