Anonymous class is not abstract and does not override (Android + Retrofit)

Anonymous class is not abstract and does not override (Android + Retrofit) - java

I am trying to make a Google map show nearby places using retrofit following this tutorial.
I get this error:
Error:(158, 46) error: is not abstract and does not
override abstract method onFailure(Call,Throwable) in
Callback
Error:(159, 13) error: method does not override or implement a method
from a supertype
I tried to implement methods using the alt + enter, but it gets different from the tutorial, and it messes up the code.
Here is my main (it's the same from the tutorial)
MapsActivity.java
package example.googlemapsapp;
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Build;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
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.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import java.util.HashMap;
import example.googlemapsapp.POJO.Example;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private GoogleMap mMap;
double latitude;
double longitude;
private int PROXIMITY_RADIUS = 10000;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
LocationRequest mLocationRequest;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
checkLocationPermission();
}
//show error dialog if Google Play Services not available
if (!isGooglePlayServicesAvailable()) {
Log.d("onCreate", "Google Play Services not available. Ending Test case.");
finish();
}
else {
Log.d("onCreate", "Google Play Services available. Continuing.");
}
// 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);
}
private boolean isGooglePlayServicesAvailable() {
GoogleApiAvailability googleAPI = GoogleApiAvailability.getInstance();
int result = googleAPI.isGooglePlayServicesAvailable(this);
if(result != ConnectionResult.SUCCESS) {
if(googleAPI.isUserResolvableError(result)) {
googleAPI.getErrorDialog(this, result,
0).show();
}
return false;
}
return true;
}
/**
* 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_HYBRID);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
} else {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
Button btnRestaurant = (Button) findViewById(R.id.btnRestaurant);
btnRestaurant.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
build_retrofit_and_get_response("restaurant");
}
});
Button btnHospital = (Button) findViewById(R.id.btnHospital);
btnHospital.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
build_retrofit_and_get_response("hospital");
}
});
Button btnSchool = (Button) findViewById(R.id.btnSchool);
btnSchool.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
build_retrofit_and_get_response("school");
}
});
}
private void build_retrofit_and_get_response(String type) {
String url = "https://maps.googleapis.com/maps/";
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(url)
.addConverterFactory(GsonConverterFactory.create())
.build();
RetrofitMaps service = retrofit.create(RetrofitMaps.class);
Call<Example> call = service.getNearbyPlaces(type, latitude + "," + longitude, PROXIMITY_RADIUS);
call.enqueue(new Callback<Example>() {
#Override
public void onResponse(Response<Example> response, Retrofit retrofit) {
try {
mMap.clear();
// This loop will go through all the results and add marker on each location.
for (int i = 0; i < response.body().getResults().size(); i++) {
Double lat = response.body().getResults().get(i).getGeometry().getLocation().getLat();
Double lng = response.body().getResults().get(i).getGeometry().getLocation().getLng();
String placeName = response.body().getResults().get(i).getName();
String vicinity = response.body().getResults().get(i).getVicinity();
MarkerOptions markerOptions = new MarkerOptions();
LatLng latLng = new LatLng(lat, lng);
// Position of Marker on Map
markerOptions.position(latLng);
// Adding Title to the Marker
markerOptions.title(placeName + " : " + vicinity);
// Adding Marker to the Camera.
Marker m = mMap.addMarker(markerOptions);
// Adding colour to the marker
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
// move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
}
} catch (Exception e) {
Log.d("onResponse", "There is an error");
e.printStackTrace();
}
}
#Override
public void onFailure(Throwable t) {
Log.d("onFailure", t.toString());
}
});
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
#Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onLocationChanged(Location location) {
Log.d("onLocationChanged", "entered");
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
latitude = location.getLatitude();
longitude = location.getLongitude();
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
// Adding colour to the marker
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
// Adding Marker to the Map
mCurrLocationMarker = mMap.addMarker(markerOptions);
//move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
Log.d("onLocationChanged", String.format("latitude:%.3f longitude:%.3f", latitude, longitude));
Log.d("onLocationChanged", "Exit");
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
public boolean checkLocationPermission(){
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Asking user if explanation is needed
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
}
return false;
} else {
return true;
}
}
#Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted. Do the
// contacts-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
} else {
// Permission denied, Disable the functionality that depends on this permission.
Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other permissions this app might request.
// You can add here other case statements according to your requirement.
}
}
}

The signature of onResponse differs from what you have.
You have:
public void onResponse( Response<Example> response, Retrofit retrofit)
It should be:
public void onResponse(Call<Example> call, Response<Example> response)
Your onFailure also needs to take a Call parameter:
public void onFailure(Call<Example> call, Throwable t)
It's possible the signatures of the methods have changed between versions of Retrofit, and that the tutorial is using an older version than you are. But I'm only speculating.

It's very easy to diagnose: Just read the error message and understand it:
It says that you are trying to sublcass the CallBack interface, so you have to override all the methods it declares. But you are not; because you have not overrided right the onFailure(Call<T> call, Throwable t) method.
See? You missed to add the call parameter in the onFailure method.
Do not trust so tightly on tutorials; use it as a basis, not as a Gospel. Maybe that tutorial is based on a prior version of Retrofit. (Or it maybe contains mistakes).

Related

Android google map with current position

I'm writing an application that among other things should draw a map with the current device position and a remote point.
I started from the example created by Android Studio (Google->Google Map Activity).
I just add the code to get the current location:
package it.tux.mapper.activities;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.fragment.app.FragmentActivity;
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.MarkerOptions;
import com.google.android.material.snackbar.Snackbar;
import java.util.Objects;
import it.tux.mapper.R;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, ActivityCompat.OnRequestPermissionsResultCallback, LocationListener {
private static final int PERMISSION_REQUEST_LOCATION = 11;
private static final int LOCATION_UPDATE_DELAY = 1000;
private final String gps_provider = LocationManager.GPS_PROVIDER;
private GoogleMap map;
private Location location;
private LocationManager location_manager;
private View layout;
#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);
if (mapFragment != null)
mapFragment.getMapAsync(this);
//USER CODE
layout = findViewById(R.id.map);
assert layout != null;
location = new Location(getString(R.string.location_provider));
location.isFromMockProvider();
initLocalization();
//
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
if (requestCode == PERMISSION_REQUEST_LOCATION) {
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Snackbar.make(layout, R.string.fine_location_access_granted, Snackbar.LENGTH_SHORT).show();
startLocalization();
} else {
Snackbar.make(layout, R.string.denied_fine_location_access_rationale, Snackbar.LENGTH_SHORT).show();
}
}
}
/**
* 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) {
map = googleMap;
}
#Override
public void onLocationChanged(Location location) {
this.location.set(location);
if (map != null) {
LatLng base = new LatLng(location.getLatitude(), location.getLongitude());
map.addMarker(new MarkerOptions().position(base).title(getString(R.string.destination_base_label)));
map.moveCamera(CameraUpdateFactory.newLatLng(base));
}
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
return;
}
#Override
public void onProviderEnabled(String s) {
return;
}
#Override
public void onProviderDisabled(String s) {
return;
}
private void requestLocationPermission() {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
Snackbar.make(layout, R.string.denied_fine_location_access_rationale,
Snackbar.LENGTH_INDEFINITE).setAction(R.string.ok, new View.OnClickListener() {
#Override
public void onClick(View view) {
ActivityCompat.requestPermissions(MapsActivity.this,
new String[]{Manifest.permission.CAMERA},
PERMISSION_REQUEST_LOCATION);
}
}).show();
} else {
Snackbar.make(layout, R.string.denied_fine_location_access_warning, Snackbar.LENGTH_SHORT).show();
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA}, PERMISSION_REQUEST_LOCATION);
}
}
private void initLocalization() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
Snackbar.make(layout,
R.string.fine_location_access_granted,
Snackbar.LENGTH_SHORT).show();
startLocalization();
} else {
requestLocationPermission();
}
}
#SuppressLint("MissingPermission")
private void startLocalization() {
try {
location_manager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (!location_manager.isProviderEnabled(gps_provider)) {
Intent gpsOptionsIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(gpsOptionsIntent);
} else {
location_manager.requestLocationUpdates(gps_provider, LOCATION_UPDATE_DELAY, 2, this);
}
} catch (Throwable e) {
Log.e(getClass().getName(), "Exception: " + e.getMessage());
}
}
}
The code seems to work, i.e. no exceptions are triggered and onMapReady, onLocationChanged and onRequestPermissionsResult events are correctly fired.
The map is just empty. And the use count of the Api key is 0.
The manifest has the correct permission entries:
<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" />
And also the GoogleApi key is correctly set (I have a developer account):
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="#string/google_maps_key" />
Where's my error?

The problem seems to be related to the internet connection used to make the first connection to google api service. Under certain firewall the connection is probably blocked preventing a successful authorization. Changing the connection fixed this issue but I probably need to investigate deeply the API auth mechanism.

Retrofit response method parsing JSON from google map api doesn't work

The loop inside the retrofitResponse method does not loops which it was suppose to do. It was suppose to fetch json data from google map url.
package com.webstarts.byteglory.shomadhan;
import android.*;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.location.Location;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.location.LocationRequest;
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.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.webstarts.byteglory.shomadhan.POJO.Example;
import retrofit.Call;
import retrofit.Callback;
import retrofit.GsonConverterFactory;
import retrofit.Response;
import retrofit.Retrofit;
public class StartActivity extends FragmentActivity implements ConnectionCallbacks, OnConnectionFailedListener, com.google.android.gms.location.LocationListener, OnMapReadyCallback {
protected GoogleApiClient mGoogleApiClient;
protected Location mLastLocation;
protected static final String TAG = "Location Services Test";
private Button search_location_button;
private Button search_area_button;
private Button toilet_status_button;
protected LatLng latlng;
protected LocationRequest mLocationRequest;
private GoogleMap mMap;
private int PROXIMITY_RADIUS = 10000;
Marker mCurrLocationMarker;
boolean mapReady = false;
private Marker mPerth;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
search_location_button = (Button) findViewById(R.id.search_location_button);
search_area_button = (Button) findViewById(R.id.search_area_button);
toilet_status_button = (Button) findViewById(R.id.toilet_status_button);
locationApiClient();
// SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
// .findFragmentById(R.id.map);
// mapFragment.getMapAsync(this);
search_location_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Log.i(TAG, String.valueOf(latlng.latitude));
// Uri gmmIntentUri = Uri.parse("geo:"+String.valueOf(latlng.latitude)+","+String.valueOf(latlng.longitude)+"?z=15&q=public toilets");
// Intent mapIntent = new Intent(Intent.ACTION_VIEW, gmmIntentUri);
// mapIntent.setPackage("com.google.android.apps.maps");
// startActivity(mapIntent);
retrofitResponse();
// Marker loc = mMap.addMarker(new MarkerOptions().position(latlng)
// .title("You are here now 23"));
// mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latlng, 15));
//
// // Zoom in, animating the camera.
// mMap.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
// Log.i(TAG, String.valueOf(latlng.latitude));
}
});
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
protected synchronized void locationApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
#Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
#Override
protected void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
/**
* Runs when a GoogleApiClient object successfully connects.
*/
#Override
public void onConnected(Bundle connectionHint) {
// Provides a simple way of getting a device's location and is well suited for
// applications that do not require a fine-grained location and that do not need location
// updates. Gets the best and most recent location currently available, which may be null
// in rare cases when a location is not available.
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(1000);
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;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if(mLastLocation != null) {
latlng = new LatLng(mLastLocation.getLatitude(), mLastLocation.getLongitude());
}
else {
Toast toast = Toast.makeText(this, "Turn on your location service", Toast.LENGTH_LONG);
toast.show();
finish();
}
}
public void onLocationChanged(Location location) {
}
#Override
public void onConnectionFailed(ConnectionResult result) {
// Refer to the javadoc for ConnectionResult to see what error codes might be returned in
// onConnectionFailed.
Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = " + result.getErrorCode());
}
/*
* Called by Google Play services if the connection to GoogleApiClient drops because of an
* error.
*/
public void onDisconnected() {
Log.i(TAG, "Disconnected");
}
#Override
public void onConnectionSuspended(int cause) {
// The connection to Google Play services was lost for some reason. We call connect() to
// attempt to re-establish the connection.
Log.i(TAG, "Connection suspended");
mGoogleApiClient.connect();
}
private void retrofitResponse() {
String url = "https://maps.googleapis.com/maps/";
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(url)
.addConverterFactory(GsonConverterFactory.create())
.build();
RetrofitMaps service = retrofit.create(RetrofitMaps.class);
Call<Example> call = service.getNearbyPlaces("restaurents", latlng.latitude + "," + latlng.longitude, PROXIMITY_RADIUS);
call.enqueue(new Callback<Example>() {
#Override
public void onResponse(Response<Example> response, Retrofit retrofit) {
try {
mMap.clear();
// This loop will go through all the results and add marker on each location.
Log.i("ishan", String.valueOf(response.body().getResults().size()));
for (int i = 0; i < response.body().getResults().size(); i++) {
Double lat = response.body().getResults().get(i).getGeometry().getLocation().getLat();
Double lng = response.body().getResults().get(i).getGeometry().getLocation().getLng();
String placeName = response.body().getResults().get(i).getName();
String vicinity = response.body().getResults().get(i).getVicinity();
MarkerOptions markerOptions = new MarkerOptions();
LatLng latLng = new LatLng(lat, lng);
// Position of Marker on Map
markerOptions.position(latLng);
// Adding Title to the Marker
markerOptions.title(placeName + " : " + vicinity);
// Adding Marker to the Camera.
Marker m = mMap.addMarker(markerOptions);
// Adding colour to the marker
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
// move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
Log.i("ishan", String.valueOf(i));
}
} catch (Exception e) {
Log.d("onResponse", "There is an error");
e.printStackTrace();
}
}
#Override
public void onFailure(Throwable t) {
Log.d("onFailure", t.toString());
}
});
}
#Override
public void onMapReady(GoogleMap map) {
mapReady=true;
mMap = map;
// //Initialize Google Play Services
// if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
// if (ContextCompat.checkSelfPermission(this,
// android.Manifest.permission.ACCESS_FINE_LOCATION)
// == PackageManager.PERMISSION_GRANTED) {
// }
// }
}
}
This is the interface of the retrofit. It has just the GET as it just reads data from map url.
package com.webstarts.byteglory.shomadhan;
import com.webstarts.byteglory.shomadhan.POJO.Example;
import retrofit.Call;
import retrofit.http.GET;
import retrofit.http.Query;
public interface RetrofitMaps {
/*
* Retrofit get annotation with our URL
* And our method that will return us details of student.
*/
#GET("api/place/nearbysearch/json?sensor=true&key=AIzaSyABCGHHSFDGSDsdfGADFnM")
Call<Example> getNearbyPlaces(#Query("type") String type, #Query("location") String location, #Query("radius") int radius);
}

I have just looped inside the onResponse retrofit function like this:
public void onResponse(Call call, Response response) {
/* implement the toast */
/* =new ArrayList<User>(); */
ArrayList<User> test;
test=response.body().getUsers();
String jax= test.get(0).getFarm_name();
//Toast.makeText(MarkerDemoActivity.this, "farm name is "+jax, Toast.LENGTH_LONG).show();
//LatLng m_cord,String farm_name,String desc
int i = 0;
while ( test.size()>i) {
String farm_name = test.get(i).getFarm_name();
String desc1 = test.get(i).getOwner_tel();
String desc2 = test.get(i).getFarm_type();
String cords = test.get(i).getM_cord();
//split the co-ords
String[] latlong = cords.split(",");
double latitude = Double.parseDouble(latlong[0]);
double longitude = Double.parseDouble(latlong[1]);
LatLng location = new LatLng(latitude, longitude);
//do the loop here
// Add lots of markers to the map. LatLng m_cord,String farm_name,String desc
addMarkersToMapJax(location, farm_name, desc1 + desc2);
i++;
}
}
I created a marker function to load the co-ordinates:
private void addMarkersToMapJax(LatLng m_cord,String farm_name,String desc) {
// Uses a colored icon.
mArc = mMap.addMarker(new MarkerOptions()
.position(m_cord)
.title(farm_name)
.snippet(desc)

No marker displayed on the map in my route tracking activity with Google Play Services version 9.0.83

In the following code the content of my if(map!=null && mapIsReady==true) {...} in my updateLocation method is never called. Any idea why?
package com.noureddine_ouertani.www.wocelli50;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.PowerManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
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.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;
import java.util.ArrayList;
import java.util.List;
public class NeueRouteAufzeichnen extends FragmentActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private LocationManager locationManager;
private Location mLastLocation;
private Location previousLocation;
private long distanceTraveled;
private boolean tracking = false;
private long startTime;
private PowerManager.WakeLock wakeLock;
private boolean gpsFix;
private static final double MILLISECONDS_PER_HOUR = 100 * 60 * 60;
private static final double MILES_PER_KILOMETER = 0.621371192;
private static final int MAP_ZOOM = 18;
private List<Location> locations;
private GoogleApiClient mGoogleApiClient;
GoogleMap map;
LatLng myPosition;
boolean mapIsReady = false;
com.google.android.gms.location.LocationListener mlocationListener = new com.google.android.gms.location.LocationListener() {
#Override
public void onLocationChanged(Location location) {
updateLocation(location);
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(AppIndex.API).build();
}
setContentView(R.layout.activity_neue_route_aufzeichnen);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
locations = new ArrayList<Location>();
}
protected void onStart() {
mGoogleApiClient.connect();
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"NeueRouteAufzeichnen Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://com.noureddine_ouertani.www.wocelli50/http/host/path")
);
AppIndex.AppIndexApi.start(mGoogleApiClient, viewAction);
}
protected void onStop() {
mGoogleApiClient.disconnect();
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"NeueRouteAufzeichnen Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://com.noureddine_ouertani.www.wocelli50/http/host/path")
);
AppIndex.AppIndexApi.end(mGoogleApiClient, viewAction);
}
#Override
public void onConnected(Bundle connectionHint) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(getApplicationContext(), "Permissions missing for mGoogleApiClient.", Toast.LENGTH_SHORT).show();
}
Toast.makeText(getApplicationContext(), "mGoogleApiClient is connected.", Toast.LENGTH_SHORT).show();
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if(mLastLocation!=null){
Toast.makeText(getApplicationContext(), "YES! mLastLocation!=null", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onConnectionSuspended(int i) {
Toast.makeText(getApplicationContext(), "Connection of mGoogleApiClient is suspended.", Toast.LENGTH_SHORT).show();
}
public void addPoint(Location location) {
locations.add(location);
Toast.makeText(getApplicationContext(), "addPoint has been called.", Toast.LENGTH_SHORT).show();
}
#Override
public void onMapReady(GoogleMap map) {
distanceTraveled = 0;
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setBearingRequired(true);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
criteria.setAltitudeRequired(false);
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Toast.makeText(getApplicationContext(), "onMapReady is called.", Toast.LENGTH_SHORT).show();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
float LOCATION_REFRESH_DISTANCE = 5000;
long LOCATION_REFRESH_TIME = 0;
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, LOCATION_REFRESH_TIME, LOCATION_REFRESH_DISTANCE, (LocationListener) mlocationListener);
}
PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "NO Sleep");
wakeLock.acquire();
if (!mGoogleApiClient.isConnected()) {
mGoogleApiClient.connect();
}
tracking = true;
startTime = System.currentTimeMillis();
//Toast.makeText(getApplicationContext(), " mGoogleApiClient.connect()call from onMapReady!", Toast.LENGTH_SHORT).show();
//LatLng sydney = new LatLng(-34, 151);
//map.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
//map.moveCamera(CameraUpdateFactory.newLatLng(sydney));
mapIsReady = true;
}
protected void updateLocation(Location location) {
Toast.makeText(getApplicationContext(), "updateLocation method called.", Toast.LENGTH_SHORT).show();
if (location != null && gpsFix == true) {
addPoint(location);
if (previousLocation != null)
distanceTraveled += location.distanceTo(previousLocation);
}
if(map!=null && mapIsReady==true) {
Toast.makeText(getApplicationContext(), " got last location ... mLastlocation displayed!", Toast.LENGTH_SHORT).show();
LatLng newPosition = new LatLng(location.getLatitude(), location.getLongitude());
map.addMarker(new MarkerOptions().position(newPosition).title("newPosition"));
map.moveCamera(CameraUpdateFactory.newLatLng(newPosition));
locations.add(mLastLocation);
}
previousLocation = location;
}
public void draw() {
Toast.makeText(getApplicationContext(), "Draw method called.", Toast.LENGTH_SHORT).show();
if (map == null) {
return;
}
PolylineOptions options = new PolylineOptions();
options.color(Color.parseColor("#CC0000FF"));
options.width(5);
options.visible(true);
for (Location locRecorded : locations) {
options.add(new LatLng(locRecorded.getLatitude(),
locRecorded.getLongitude()));
Toast.makeText(getApplicationContext(), "draw method got new location!", Toast.LENGTH_SHORT).show();
}
map.addPolyline(options);
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
Toast.makeText(getApplicationContext(), "Connection of mGoogleApiClient failed.", Toast.LENGTH_SHORT).show();
}
}
I get the following map (with no marker)
PS: I still don't call my draw() method.
and I get this log error that you see.
06-24 18:50:24.488 7128-7759/com.noureddine_ouertani.www.wocelli50
E/DynamiteModule: Failed to load module descriptor class: Didn't find
class
"com.google.android.gms.dynamite.descriptors.com.google.android.gms.googlecertificates.ModuleDescriptor"
on path: DexPathList[[zip file
"/data/app/com.noureddine_ouertani.www.wocelli50-2/base.apk"],nativeLibraryDirectories=[/vendor/lib64,
/system/lib64]]
After reading some posts and answers (e.g. this or this) about this log error I thought that I figured out that it's a known Google Play Services version 9.0.83 issue that causes bugs in some apps that use a GoogleApiClient like mine.
I tried to fix this by:
1. Downgrading Google Play Services Manually
2. Adapting dependencies after downgrading Google Play Sevices
But this didn't solve the problem.
PS: Here is my XML
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/map"
tools:context=".NeueRouteAufzeichnen"
android:name="com.google.android.gms.maps.SupportMapFragment" />

As you are using FusedLocationApi, you can request location updates as explained here: https://developer.android.com/training/location/receive-location-updates.html
You also need to add this.map = map; in your onMapReady.
In your example:
public class NeueRouteAufzeichnen extends FragmentActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private Location mLastLocation;
private Location previousLocation;
private long distanceTraveled;
private boolean tracking = false;
private long startTime;
private PowerManager.WakeLock wakeLock;
private boolean gpsFix;
private static final double MILLISECONDS_PER_HOUR = 100 * 60 * 60;
private static final double MILES_PER_KILOMETER = 0.621371192;
private static final int MAP_ZOOM = 18;
private List<Location> locations;
private GoogleApiClient mGoogleApiClient;
GoogleMap map;
LatLng myPosition;
boolean mapIsReady = false;
LocationRequest mLocationRequest;
com.google.android.gms.location.LocationListener mlocationListener = new com.google.android.gms.location.LocationListener() {
#Override
public void onLocationChanged(Location location) {
updateLocation(location);
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(AppIndex.API).build();
}
setContentView(R.layout.activity_neue_route_aufzeichnen);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
locations = new ArrayList<Location>();
}
protected void onStart() {
mGoogleApiClient.connect();
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"NeueRouteAufzeichnen Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://com.noureddine_ouertani.www.wocelli50/http/host/path")
);
AppIndex.AppIndexApi.start(mGoogleApiClient, viewAction);
}
protected void onStop() {
mGoogleApiClient.disconnect();
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"NeueRouteAufzeichnen Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app URL is correct.
Uri.parse("android-app://com.noureddine_ouertani.www.wocelli50/http/host/path")
);
AppIndex.AppIndexApi.end(mGoogleApiClient, viewAction);
}
#Override
public void onConnected(Bundle connectionHint) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(getApplicationContext(), "Permissions missing for mGoogleApiClient.", Toast.LENGTH_SHORT).show();
}
Toast.makeText(getApplicationContext(), "mGoogleApiClient is connected.", Toast.LENGTH_SHORT).show();
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
Toast.makeText(getApplicationContext(), "YES! mLastLocation!=null", Toast.LENGTH_SHORT).show();
}
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(1000); // 1 SECOND
mLocationRequest.setFastestInterval(1000); // 1 SECOND
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, mlocationListener);
}
#Override
public void onConnectionSuspended(int i) {
Toast.makeText(getApplicationContext(), "Connection of mGoogleApiClient is suspended.", Toast.LENGTH_SHORT).show();
}
public void addPoint(Location location) {
locations.add(location);
Toast.makeText(getApplicationContext(), "addPoint has been called.", Toast.LENGTH_SHORT).show();
}
#Override
public void onMapReady(GoogleMap map) {
this.map = map;
distanceTraveled = 0;
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setBearingRequired(true);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
criteria.setAltitudeRequired(false);
Toast.makeText(getApplicationContext(), "onMapReady is called.", Toast.LENGTH_SHORT).show();
PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "NO Sleep");
wakeLock.acquire();
if (!mGoogleApiClient.isConnected()) {
mGoogleApiClient.connect();
}
tracking = true;
startTime = System.currentTimeMillis();
//Toast.makeText(getApplicationContext(), " mGoogleApiClient.connect()call from onMapReady!", Toast.LENGTH_SHORT).show();
//LatLng sydney = new LatLng(-34, 151);
//map.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
//map.moveCamera(CameraUpdateFactory.newLatLng(sydney));
mapIsReady = true;
}
protected void updateLocation(Location location) {
Toast.makeText(getApplicationContext(), "updateLocation method called.", Toast.LENGTH_SHORT).show();
if (location != null && gpsFix == true) {
addPoint(location);
if (previousLocation != null)
distanceTraveled += location.distanceTo(previousLocation);
}
if (map != null && mapIsReady == true) {
Toast.makeText(getApplicationContext(), " got last location ... mLastlocation displayed!", Toast.LENGTH_SHORT).show();
LatLng newPosition = new LatLng(location.getLatitude(), location.getLongitude());
map.addMarker(new MarkerOptions().position(newPosition).title("newPosition"));
map.moveCamera(CameraUpdateFactory.newLatLng(newPosition));
locations.add(mLastLocation);
}
previousLocation = location;
}
public void draw() {
Toast.makeText(getApplicationContext(), "Draw method called.", Toast.LENGTH_SHORT).show();
if (map == null) {
return;
}
PolylineOptions options = new PolylineOptions();
options.color(Color.parseColor("#CC0000FF"));
options.width(5);
options.visible(true);
for (Location locRecorded : locations) {
options.add(new LatLng(locRecorded.getLatitude(),
locRecorded.getLongitude()));
Toast.makeText(getApplicationContext(), "draw method got new location!", Toast.LENGTH_SHORT).show();
}
map.addPolyline(options);
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
Toast.makeText(getApplicationContext(), "Connection of mGoogleApiClient failed.", Toast.LENGTH_SHORT).show();
}
}

Android mapping activity does not follow user or display location layer [duplicate]

I want google maps to show the location of the user. I tried this code, but it did not work on Android 6.
private GoogleMap map;
LocationManager lm;
LocationListener ll;
Location l;
LatLng pos;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.start_layout);
lm = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
ll = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
l = (Location) location;
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
#Override
public void onProviderEnabled(String provider) {}
#Override
public void onProviderDisabled(String provider) {}
};
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.nMap);
mapFragment.getMapAsync(this);
}
#Override
public void onMapReady(GoogleMap googleMap) {
map = googleMap;
if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
lm.requestLocationUpdates(lm.NETWORK_PROVIDER, 0, 0, ll);
}
pos = new LatLng(l.getLatitude(), l.getLongitude());
// Add a marker in Sydney and move the camera
map.setMyLocationEnabled(true);
map.addMarker(new MarkerOptions().position(pos).title("Marker in Sydney"));
map.moveCamera(CameraUpdateFactory.newLatLng(pos));
}
Here are the permissions I've set:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />

For using FusedLocationProviderClient with Google Play Services 11 and higher:
see here:
How to get current Location in GoogleMap using FusedLocationProviderClient
For using (now deprecated) FusedLocationProviderApi:
If your project uses Google Play Services 10 or lower, using the FusedLocationProviderApi is the optimal choice.
The FusedLocationProviderApi offers less battery drain than the old open source LocationManager API.
Also, if you're already using Google Play Services for Google Maps, there's no reason not to use it.
Here is a full Activity class that places a Marker at the current location, and also moves the camera to the current position.
It also checks for the Location permission at runtime for Android 6 and later (Marshmallow, Nougat, Oreo).
In order to properly handle the Location permission runtime check that is necessary on Android M/Android 6 and later, you need to ensure that the user has granted your app the Location permission before calling mGoogleMap.setMyLocationEnabled(true) and also before requesting location updates.
public class MapLocationActivity extends AppCompatActivity
implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
GoogleMap mGoogleMap;
SupportMapFragment mapFrag;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Location mLastLocation;
Marker mCurrLocationMarker;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setTitle("Map Location Activity");
mapFrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFrag.getMapAsync(this);
}
#Override
public void onPause() {
super.onPause();
//stop location updates when Activity is no longer active
if (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
#Override
public void onMapReady(GoogleMap googleMap)
{
mGoogleMap=googleMap;
mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
//Initialize Google Play Services
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Location Permission already granted
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
} else {
//Request Location Permission
checkLocationPermission();
}
}
else {
buildGoogleApiClient();
mGoogleMap.setMyLocationEnabled(true);
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
}
#Override
public void onConnected(Bundle bundle) {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(1000);
mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
#Override
public void onConnectionSuspended(int i) {}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {}
#Override
public void onLocationChanged(Location location)
{
mLastLocation = location;
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);
//move map camera
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,11));
}
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
private void checkLocationPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an explanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
new AlertDialog.Builder(this)
.setTitle("Location Permission Needed")
.setMessage("This app needs the Location permission, please accept to use location functionality")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
//Prompt the user once explanation has been shown
ActivityCompat.requestPermissions(MapLocationActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
})
.create()
.show();
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION );
}
}
}
#Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
if (mGoogleApiClient == null) {
buildGoogleApiClient();
}
mGoogleMap.setMyLocationEnabled(true);
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/map"
tools:context=".MapLocationActivity"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
</LinearLayout>
Result:
Show permission explanation if needed using an AlertDialog (this happens if the user denies a permission request, or grants the permission and then later revokes it in the settings):
Prompt the user for Location permission by calling ActivityCompat.requestPermissions():
Move camera to current location and place Marker when the Location permission is granted:

Sorry but that's just much too much overhead (above), short and quick, if you have the MapFragment, you also have to map, just do the following:
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
googleMap.setMyLocationEnabled(true)
} else {
// Show rationale and request permission.
}
Code is in Kotlin, hope you don't mind.
have fun
Btw I think this one is a duplicate of: Show Current Location inside Google Map Fragment

Firstly make sure your API Key is valid and add this into your manifest <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
Here's my maps activity.. there might be some redundant information in it since it's from a larger project I created.
import android.content.Intent;
import android.content.IntentSender;
import android.location.Location;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
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.LocationListener;
import com.google.android.gms.location.LocationRequest;
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
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
//These variable are initalized here as they need to be used in more than one methid
private double currentLatitude; //lat of user
private double currentLongitude; //long of user
private double latitudeVillageApartmets= 53.385952001750184;
private double longitudeVillageApartments= -6.599087119102478;
public static final String TAG = MapsActivity.class.getSimpleName();
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
// Create the LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(10 * 1000) // 10 seconds, in milliseconds
.setFastestInterval(1 * 1000); // 1 second, in milliseconds
}
/*These methods all have to do with the map and wht happens if the activity is paused etc*/
//contains lat and lon of another marker
private void setUpMap() {
MarkerOptions marker = new MarkerOptions().position(new LatLng(latitudeVillageApartmets, longitudeVillageApartments)).title("1"); //create marker
mMap.addMarker(marker); // adding marker
}
//contains your lat and lon
private void handleNewLocation(Location location) {
Log.d(TAG, location.toString());
currentLatitude = location.getLatitude();
currentLongitude = location.getLongitude();
LatLng latLng = new LatLng(currentLatitude, currentLongitude);
MarkerOptions options = new MarkerOptions()
.position(latLng)
.title("You are here");
mMap.addMarker(options);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom((latLng), 11.0F));
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
mGoogleApiClient.connect();
}
#Override
protected void onPause() {
super.onPause();
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
mGoogleApiClient.disconnect();
}
}
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();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
#Override
public void onConnected(Bundle bundle) {
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location == null) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
else {
handleNewLocation(location);
}
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
/*
* Thrown if Google Play services canceled the original
* PendingIntent
*/
} catch (IntentSender.SendIntentException e) {
// Log the error
e.printStackTrace();
}
} else {
/*
* If no resolution is available, display a dialog to the
* user with the error.
*/
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
#Override
public void onLocationChanged(Location location) {
handleNewLocation(location);
}
}
There's a lot of methods here that are hard to understand but basically all update the map when it's paused etc. There are also connection timeouts etc. Sorry for just posting this, I tried to fix your code but I couldn't figure out what was wrong.

How to Sign-In to Google Across Multiple Activities

When I sign in through Google Sign-In to ActivityA, I want ActivityB to sign in to the same account simultaneously and and have all the capabilities of ActivityA. When I sign-out of ActivityB, I want it to also sign out of ActivityA.
For example, I have a HomeActivity using Google's PlusApi and then I have a MapsActivity that will be used for my navigation and all other Api Services I want to include.
1) Is this possible?
2) Is this the best way to do this and/or is there a better way to do it?
Here is my Code:
HomeActivity
import android.app.Activity;
import android.content.Intent;
import android.content.IntentSender;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.Scopes;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.Scope;
import com.google.android.gms.plus.Plus;
import com.google.android.gms.plus.model.people.Person;
public class HomeActivity extends Activity implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
View.OnClickListener {
/* Request code used to invoke sign in user interactions. */
private static final int RC_SIGN_IN = 0;
/* Keys for persisting instance variables in savedInstanceState */
private static final String KEY_IS_RESOLVING = "is_resolving";
private static final String KEY_SHOULD_RESOLVE = "should_resolve";
/* Client used to interact with Google APIs. */
private GoogleApiClient mGoogleApiClient;
/* View to display current status (signed-in, signed-out, disconnected, etc) */
private TextView mStatus;
/* Is there a ConnectionResult resolution in progress? */
private boolean mIsResolving = false;
/* Should we automatically resolve ConnectionResults when possible? */
private boolean mShouldResolve = false;
private static final String TAG = "SignInActivity";
//
// private ProgressBar spinner;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
// Restore from saved instance state
// [START restore_saved_instance_state]
if (savedInstanceState != null) {
mIsResolving = savedInstanceState.getBoolean(KEY_IS_RESOLVING);
mShouldResolve = savedInstanceState.getBoolean(KEY_SHOULD_RESOLVE);
}
// [END restore_saved_instance_state]
// Set up button click listeners
findViewById(R.id.sign_in_button).setOnClickListener(this);
findViewById(R.id.sign_out_button).setOnClickListener(this);
findViewById(R.id.disconnect_button).setOnClickListener(this);
// spinner = (ProgressBar)findViewById(R.id.sign_in_loading);
// spinner.setVisibility(View.VISIBLE);
// Log.w(TAG, "Spinner is visible");
//
//
// findViewById(R.id.login_screen).setVisibility(View.INVISIBLE);
// Large sign-in
((SignInButton) findViewById(R.id.sign_in_button)).setSize(SignInButton.SIZE_WIDE);
// Start with sign-in button disabled until sign-in either succeeds or fails
findViewById(R.id.sign_in_button).setEnabled(false);
// Set up view instances
mStatus = (TextView) findViewById(R.id.status);
// Build GoogleApiClient to request access to the basic user profile
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(Plus.API)
.addScope(new Scope(Scopes.PROFILE))
.build();
}
private void updateUI(boolean isSignedIn) {
if (isSignedIn) {
// Show signed-in user's name
Person currentPerson = Plus.PeopleApi.getCurrentPerson(mGoogleApiClient);
if (currentPerson != null) {
String name = currentPerson.getDisplayName();
mStatus.setText(getString(R.string.signed_in_fmt, name));
} else {
Log.w(TAG, getString(R.string.error_null_person));
mStatus.setText(getString(R.string.signed_in_err));
}
// Set button visibility
findViewById(R.id.sign_in_button).setVisibility(View.GONE);
findViewById(R.id.sign_out_and_disconnect).setVisibility(View.VISIBLE);
Log.w(TAG, "UI has been updated.");
} else {
// Show signed-out message
mStatus.setText(R.string.signed_out);
// Set button visibility
findViewById(R.id.sign_in_button).setEnabled(true);
findViewById(R.id.sign_in_button).setVisibility(View.VISIBLE);
findViewById(R.id.sign_out_and_disconnect).setVisibility(View.GONE);
}
}
#Override
public void onConnected(Bundle bundle) {
// onConnected indicates that an account was selected on the device, that the selected
// account has granted any requested permissions to our app and that we were able to
// establish a service connection to Google Play services.
Log.d(TAG, "onConnected:" + bundle);
// Show the signed-in UI
updateUI(true);
}
#Override
public void onConnectionSuspended(int i) {
// The connection to Google Play services was lost. The GoogleApiClient will automatically
// attempt to re-connect. Any UI elements that depend on connection to Google APIs should
// be hidden or disabled until onConnected is called again.
Log.w(TAG, "onConnectionSuspended:" + i);
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.sign_in_button:
// User clicked the sign-in button, so begin the sign-in process and automatically
// attempt to resolve any errors that occur.
mStatus.setText(R.string.signing_in);
// [START sign_in_clicked]
mShouldResolve = true;
mGoogleApiClient.connect();
// [END sign_in_clicked]
break;
case R.id.sign_out_button:
// Clear the default account so that GoogleApiClient will not automatically
// connect in the future.
// [START sign_out_clicked]
if (mGoogleApiClient.isConnected()) {
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
mGoogleApiClient.disconnect();
}
// [END sign_out_clicked]
updateUI(false);
break;
case R.id.disconnect_button:
// Revoke all granted permissions and clear the default account. The user will have
// to pass the consent screen to sign in again.
// [START disconnect_clicked]
if (mGoogleApiClient.isConnected()) {
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
Plus.AccountApi.revokeAccessAndDisconnect(mGoogleApiClient);
mGoogleApiClient.disconnect();
}
// [END disconnect_clicked]
updateUI(false);
break;
}
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
// Could not connect to Google Play Services. The user needs to select an account,
// grant permissions or resolve an error in order to sign in. Refer to the javadoc for
// ConnectionResult to see possible error codes.
Log.d(TAG, "onConnectionFailed:" + connectionResult);
if (!mIsResolving && mShouldResolve) {
if (connectionResult.hasResolution()) {
try {
connectionResult.startResolutionForResult(this, RC_SIGN_IN);
mIsResolving = true;
} catch (IntentSender.SendIntentException e) {
Log.e(TAG, "Could not resolve ConnectionResult.", e);
mIsResolving = false;
mGoogleApiClient.connect();
}
} else {
// Could not resolve the connection result, show the user an
// error dialog.
showErrorDialog(connectionResult);
}
} else {
// Show the signed-out UI
updateUI(false);
}
}
#Override
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
#Override
protected void onStop() {
super.onStop();
mGoogleApiClient.disconnect();
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Log.d(TAG, "onActivityResult:" + requestCode + ":" + resultCode + ":" + data);
if (requestCode == RC_SIGN_IN) {
// If the error resolution was not successful we should not resolve further.
if (resultCode != RESULT_OK) {
mShouldResolve = false;
}
mIsResolving = false;
mGoogleApiClient.connect();
Intent startMaps = new Intent(HomeActivity.this, MapsActivity.class);
HomeActivity.this.startActivity(startMaps);
}
}
private void showErrorDialog(ConnectionResult connectionResult) {
int errorCode = connectionResult.getErrorCode();
if (GooglePlayServicesUtil.isUserRecoverableError(errorCode)) {
// Show the default Google Play services error dialog which may still start an intent
// on our behalf if the user can resolve the issue.
GooglePlayServicesUtil.getErrorDialog(errorCode, this, RC_SIGN_IN,
new DialogInterface.OnCancelListener() {
#Override
public void onCancel(DialogInterface dialog) {
mShouldResolve = false;
updateUI(false);
}
}).show();
} else {
// No default Google Play Services error, display a message to the user.
String errorString = getString(R.string.play_services_error_fmt, errorCode);
Toast.makeText(this, errorString, Toast.LENGTH_SHORT).show();
mShouldResolve = false;
updateUI(false);
}
}
}
MapsActivity
import android.content.Intent;
import android.content.IntentSender;
import android.location.Location;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.plus.Plus;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener,
View.OnClickListener {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
private GoogleApiClient mGoogleApiClient;
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private LocationRequest mLocationRequest;
private HomeActivity mHomeActivity = new HomeActivity();
public static final String TAG = MapsActivity.class.getSimpleName();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
//Create the LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY)
.setInterval(10*1000) //10 seconds, in milliseconds
.setFastestInterval(1 * 1000); //1 second, in milliseconds
findViewById(R.id.sign_out_button).setOnClickListener(this);
findViewById(R.id.disconnect_button).setOnClickListener(this);
}
#Override
public void onMapReady(GoogleMap map){
//Add a marker in Sydney, Australia, and move the camera.
LatLng sydney = new LatLng(-34, 151);
map.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
map.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
setUpMapIfNeeded();
mGoogleApiClient.connect();
}
#Override
protected void onPause() {
super.onPause();
if(mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
mGoogleApiClient.disconnect();
}
}
/**
* Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
* installed) and the map has not already been instantiated.. This will ensure that we only ever
* call {#link #setUpMap()} once when {#link #mMap} is not null.
* <p/>
* If it isn't installed {#link SupportMapFragment} (and
* {#link com.google.android.gms.maps.MapView MapView}) will show a prompt for the user to
* install/update the Google Play services APK on their device.
* <p/>
* A user can return to this FragmentActivity after following the prompt and correctly
* installing/updating/enabling the Google Play services. Since the FragmentActivity may not
* have been completely destroyed during this process (it is likely that it would only be
* stopped or paused), {#link #onCreate(Bundle)} may not be called again so we should call this
* method in {#link #onResume()} to guarantee that it will be called.
*/
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();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
/**
* This is where we can add markers or lines, add listeners or move the camera. In this case, we
* just add a marker near Africa.
* <p/>
* This should only be called once and when we are sure that {#link #mMap} is not null.
*/
private void setUpMap() {
mMap.setMyLocationEnabled(true);
}
private void handleNewLocation(Location location) {
Log.d(TAG, location.toString());
double currentLatitude = location.getLatitude();
double currentLongitude = location.getLongitude();
LatLng latlng = new LatLng(currentLatitude, currentLongitude);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latlng));
}
#Override
public void onConnected(Bundle bundle) {
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location==null) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
else {
handleNewLocation(location);
}
}
#Override
public void onConnectionSuspended(int i) {
}
#Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (connectionResult.hasResolution()) {
try {
//Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
} catch (IntentSender.SendIntentException e) {
e.printStackTrace();
}
} else {
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
#Override
public void onLocationChanged(Location location) {
handleNewLocation(location);
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.sign_out_button:
// Clear the default account so that GoogleApiClient will not automatically
// connect in the future.
// [START sign_out_clicked]
// if (mGoogleApiClient.isConnected()) {
// Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
// mGoogleApiClient.disconnect();
// }
// [END sign_out_clicked]
Intent startHomeDisconnect = new Intent(MapsActivity.this, HomeActivity.class);
MapsActivity.this.startActivity(startHomeDisconnect);
break;
case R.id.disconnect_button:
// Revoke all granted permissions and clear the default account. The user will have
// to pass the consent screen to sign in again.
// [START disconnect_clicked]
// if (mGoogleApiClient.isConnected()) {
// Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
// Plus.AccountApi.revokeAccessAndDisconnect(mGoogleApiClient);
// mGoogleApiClient.disconnect();
// }
// [END disconnect_clicked]
Intent startHomeSignOut = new Intent(MapsActivity.this, HomeActivity.class);
MapsActivity.this.startActivity(startHomeSignOut);
break;
}
}
}

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