In my Android app, I have added a map activity, and I want to be able to monitor the location in background as well and keep updating location data. This data will then be used to perform on location-specific functions.
I am new to Android, so maximum help will be appreciated.
So far, I have the basic code for launching map.
package com.app.alviefinal.alviefinal;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import com.google.android.gms.maps.CameraUpdateFactory;
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.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity {
private GoogleMap newmap; // Might be null if Google Play services APK is not available.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
Log.d("Map","MapCreated");
setUpMapIfNeeded();
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (newmap == null) {
// Try to obtain the map from the SupportMapFragment.
newmap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (newmap != null) {
setUpMap();
Log.d("MAPS","Map working");
}
else Log.d("MAPS","not working");
}
}
private void setUpMap() {
newmap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker").snippet("Snippet"));
// Enable MyLocation Layer of Google Map
newmap.setMyLocationEnabled(true);
// Get LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Create a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Get the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Get Current Location
Location myLocation = locationManager.getLastKnownLocation(provider);
// set map type
newmap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
// Get latitude of the current location
double latitude = myLocation.getLatitude();
// Get longitude of the current location
double longitude = myLocation.getLongitude();
// Create a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude);
// Show the current location in Google Map
newmap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
// Zoom in the Google Map
newmap.animateCamera(CameraUpdateFactory.zoomTo(20));
newmap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("My location"));
Log.d("LATITUDE",String.valueOf(latitude));
Log.d("LONGITUDE",String.valueOf(longitude));
GoogleMap.OnMarkerClickListener listener = new GoogleMap.OnMarkerClickListener() {
#Override
public boolean onMarkerClick(final Marker marker) {
Intent intent=new Intent(getApplicationContext(),PrefActivity.class);
startActivity(intent);
return true;
}
};
newmap.setOnMarkerClickListener(listener);
newmap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng latLng) {
// Creating a marker
MarkerOptions markerOptions = new MarkerOptions();
// Setting the position for the marker
markerOptions.position(latLng);
// Setting the title for the marker.
// This will be displayed on taping the marker
markerOptions.title(latLng.latitude + " : " + latLng.longitude);
// Animating to the touched position
newmap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
// Placing a marker on the touched position
newmap.addMarker(markerOptions);
Log.d("ADDED LATITUDE",String.valueOf(latLng.latitude));
Log.d("ADDED LONGITUDE",String.valueOf(latLng.longitude));
}
});
}
}
You can use Service to get data in the background. For that you have to create a class that extends Service class and then override onStartCommand to write your own code. Something like this:
public class MyService extends Service {
#Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
#Override
public int onStartCommand(Intent intent,int flags, int startId) {
...
return START_STICKY;
}
}
You can use timer inside onStartCommand to update your data.
You have to register your service in Android Manifest like this:
<service
android:name=".MyService"
android:enabled="true" >
</service>
You must remember that the service will not start automatically if the phone is restarted. You have to use Boot Broadcast Receiver to start the service.
Related
My problem is: When I'm trying to move around in the map or zoom in & out it immediately return to my current location. Also when I search for location, new marker added at the searched location but immediately goes back to my current location.
I searched for solution but found nothing.. I hope somebody can figure it out
package com.hitman.locationrevision;
import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.FragmentActivity;
import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationRequest;
import android.os.Bundle;
import android.widget.Toast;
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.hitman.locationrevision.databinding.ActivityMapsBinding;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
LocationManager locationManager;
LocationListener locationListener;
>function for current location information
public void locationInfo(Location location,String title){
if(location != null) {
LatLng currentLocation = new LatLng(location.getLatitude(), location.getLongitude());
mMap.clear();
mMap.addMarker(new MarkerOptions().position(currentLocation).title(title));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(currentLocation,10));
}
}
>function to request permission from user
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
if(ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION)==PackageManager.PERMISSION_GRANTED){
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
Location lastLocation=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
locationInfo(lastLocation,"Your lastLocation");
}
}
}
private GoogleMap mMap;
private ActivityMapsBinding binding;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityMapsBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
Intent intent=getIntent();
locationManager=(LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener=new LocationListener() {
#Override
public void onLocationChanged(#NonNull Location location) {
locationInfo(location,"Your Location");
}
};
>code to ask permission and check permission from user
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)!= PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},1);
}else{
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
>code to find the last location and update the last location
Location
lastLocation=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
locationInfo(lastLocation,"Your lastlocation");
}
}
}
Its because you have move camera when your location update. You just need to put condition whether its user call or not to see current location.
Here is the line, this will alway move camera and display your current location
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(currentLocation,10));
You can do like this, whenever user required to see current location then change fromUser = true and then make to false back. Just like happen in Google Map when you click on location button.
var fromUser = false;
if(fromUser){
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(currentLocation,10));
fromUser = false;
}
Use this code for get current location.this method only get one time
of user location.inside OnLocationResult callback handle your location
logic
private void getCurrentLocation(){
LocationRequest locationRequest = new LocationRequest();
FusedLocationProviderClient fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setMaxWaitTime(1000);
locationRequest.setFastestInterval(500);
locationRequest.setInterval(500);
fusedLocationProviderClient.requestLocationUpdates(locationRequest, new LocationCallback() {
#Override
public void onLocationResult( LocationResult locationResult) {
if(locationResult.getLocations().size() != 0){
Location location = locationResult.getLocations().get(0);
LatLng latLng = new LatLng(location.getLatitude(),location.getLongitude());
//handle current user location logic
FusedLocationProviderClient.removeLocationUpdates(this);
}
}
}, Looper.getMainLooper());
}
This question already has answers here:
Android LocationListener, AbstractMethodError on onStatusChanged and onProviderDisabled
(6 answers)
Closed 1 year ago.
I've tried this code from an UDEMY Course. Written same like him, he can access to location & also got a Toast while I cant opening app with allowed Location.
When allowing location, my app crashing.
But when deny I can see the map and not crashing anymore.
***My google map API also working good. also taken user Internet & Location Service.
MapsActivity.java:
package com.project.demo2map;
import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.FragmentActivity;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
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.project.demo2map.databinding.ActivityMapsBinding;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private ActivityMapsBinding binding;
LocationManager locationManager;
LocationListener locationListener;
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, locationListener);
}
}
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityMapsBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
// 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);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
#Override
public void onLocationChanged(#NonNull Location location) {
Toast.makeText(MapsActivity.this, location.toString(), Toast.LENGTH_SHORT).show();
}
};
if (Build.VERSION.SDK_INT < 23) {
locationManager.requestLocationUpdates(LocationManager.
GPS_PROVIDER, 0, 0, locationListener);
}else {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
} else {
locationManager.requestLocationUpdates(LocationManager.
GPS_PROVIDER, 0, 0, locationListener);
}
}
}
/**
* 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;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}
CrashLog:
2021-10-25 14:59:29.003 25984-25984/com.project.demo2map D/AndroidRuntime: Shutting down VM
2021-10-25 14:59:29.006 25984-25984/com.project.demo2map E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.project.demo2map, PID: 25984
java.lang.AbstractMethodError: abstract method "void android.location.LocationListener.onProviderDisabled(java.lang.String)"
at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:365)
at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:275)
at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:291)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:925)
Overriding the onProviderChanged() method will fix this problem.
check if any providers active.
if( locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER) ||
locationManager .isProviderEnabled(LocationManager.GPS_PROVIDER)){
//start listener to requestUpdates ...
}else{
//show message, no providers enabled.
}
I am a new learner in Java. As the title describes, I can't roam freely on google maps in the emulator PIXEL 2 API 29. The camera is stuck in the center of the location and no matter what I can't get the camera to elsewhere. I dont think it is the API cuz I have tested it without the code. Open to the suggestions, thank you. here is the code;
`
import androidx.annotation.NonNull;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.FragmentActivity;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Build;
import android.os.Bundle;
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;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
#Override
public void onLocationChanged(#NonNull Location location) {
LatLng userLocation = new LatLng(location.getLatitude(),location.getLongitude());
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation,15));
System.out.println("location: " + location);
}
};
if(Build.VERSION.SDK_INT >= 23) {
if(checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED){
requestPermissions(new String[] {Manifest.permission.ACCESS_FINE_LOCATION},1);
} else {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0,locationListener);
}
}else {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0,locationListener);
}
}
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(grantResults.length> 0){
if(requestCode==1){
if(ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0,locationListener);
}
}
}
}
}`
This is because the function onLocationChanged() of LocationLister in your code moves the camera to the current location of your device that gets triggered whenever the center of the map is not in the current location of the device.
public void onLocationChanged(Location location) {
LatLng userLocation = new LatLng(location.getLatitude(),location.getLongitude());
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation,15));
System.out.println("location: " + location);
}
LocationListener location is registered through the location manager service using the locationManager.requestLocationUpdates(). To learn more please see the documentation here.
If your main goal is to get the current device location and display it on the map as it loads, there is an official documentation from Google Maps Platform to guide you on how to do it. To get you started, you can check it here.
I am not able to figure out why i am getting null pointer exception everytime i am running the app.This android app finds the place and marks it on the map using geocoding.But i have not succeded in doing so and not getting to know where is the mistake.Please help!
The main activity code is as follows:
package com.dutt.rishabh.locator;
import android.location.Address;
import android.location.Geocoder;
import android.os.AsyncTask;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
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 java.io.IOException;
import java.util.List;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
EditText x;
Button bfind;
String location;
MarkerOptions markerOptions;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
bfind=(Button)findViewById(R.id.bfind);
View.OnClickListener findClickListener =new View.OnClickListener() {
#Override
public void onClick(View view) {
x=(EditText)findViewById(R.id.etsearch);
location=x.getText().toString();
if(location!=null || location.equals("")){
new GeocoderTask().execute(location);
}
}
};
bfind.setOnClickListener(findClickListener);
}
private class GeocoderTask extends AsyncTask<String, Void, List<Address>>{
#Override
protected List<Address> doInBackground(String... strings) {
Geocoder geocoder = new Geocoder(getBaseContext());
List<Address> addresses=null;
try {
addresses=geocoder.getFromLocationName(strings[0],3);
} catch (IOException e) {
e.printStackTrace();
}
return addresses;
}
#Override
protected void onPostExecute(List<Address> addresses){
if(addresses==null || addresses.size()==0){
Toast.makeText(getBaseContext(),"No location found",Toast.LENGTH_SHORT).show();
}
mMap.clear();
for(int i=0;i<addresses.size();i++){
Address address= addresses.get(i);
LatLng latLng=new LatLng(address.getLatitude(),address.getLongitude());
String addressText=String.format("%s,%s",address.getMaxAddressLineIndex()>0?address.getAddressLine(0):"",address.getCountryName());
markerOptions=new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title(addressText);
mMap.addMarker(markerOptions);
if(i==0){
mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
}
}
}
}
/**
* 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;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}
Please help and kindly mention my mistake so i can understand.
The following is the logcat :
07-26 15:02:02.264 30388-30388/com.dutt.rishabh.locator E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.dutt.rishabh.locator, PID: 30388
java.lang.NullPointerException
at com.dutt.rishabh.locator.MapsActivity$GeocoderTask.onPostExecute(MapsActivity.java:75)
at com.dutt.rishabh.locator.MapsActivity$GeocoderTask.onPostExecute(MapsActivity.java:57)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5345)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
at dalvik.system.NativeStart.main(Native Method)
Null check for addresses
for(int i=0;i<addresses.size();i++){
}
or add return
if(addresses==null || addresses.size()==0){
Toast.makeText(getBaseContext(),"No location found",Toast.LENGTH_SHORT).show();
return;
}
In your case the address list seems to be null. You can return code execution after showing the toast message.
if(addresses==null || addresses.size()==0){ // Line 71
Toast.makeText(getBaseContext(),"No location found",Toast.LENGTH_SHORT).show();
return;
}
I'm developing an APP that get user specified latitude,longitude, and altitude, then fake this GPS location on the phone, and show that I am at that location in google map. I have the required permission on manifest file and mocked location is enabled in developer settings.
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//lm.clearTestProviderEnabled(mocLocationProvider);
lm.addTestProvider(mocLocationProvider, false, false, false, false, false, false, false, 0, 10);
lm.setTestProviderEnabled(mocLocationProvider, true);
mockLocation = new Location(mocLocationProvider); // a string
mockLocation.setLatitude(Integer.parseInt(latitude.getText().toString())); // double
mockLocation.setLongitude(Integer.parseInt(longitude.getText().toString()));
mockLocation.setAltitude(Integer.parseInt(altitude.getText().toString()));
mockLocation.setTime(System.currentTimeMillis());
lm.setTestProviderLocation( mocLocationProvider, mockLocation);
But looks like my GPS location is not changed at all on google map, what is the problem?
Update: I just installed an app called "fake GPS location" on my phone and that app works fine, but I still don't know what's wrong with my code, but I think mine is a formal way to achieve this.
Update #2: Although some of similar applications can run on my phone, but I found some exceptions, http://www.cowlumbus.nl/forum/MockGpsProvider.zip, this app is not working on my phone. can someone help me with this issue? millions of thanks! I'm not getting any error message when setting the location each time.
Update#3 : I noticed that this app is fairly old, so it does not run on 4.1. if so, how to do the same thing in the new version? my phone is samsung galaxy s3, hope it helps.
Update#4: for your info, the code from app in my update#2 is:
package nl.cowlumbus.android.mockgps;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class MockGpsProviderActivity extends Activity implements LocationListener {
public static final String LOG_TAG = "MockGpsProviderActivity";
private static final String MOCK_GPS_PROVIDER_INDEX = "GpsMockProviderIndex";
private MockGpsProvider mMockGpsProviderTask = null;
private Integer mMockGpsProviderIndex = 0;
/** Called when the activity is first created. */
/* (non-Javadoc)
* #see android.app.Activity#onCreate(android.os.Bundle)
*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/** Use saved instance state if necessary. */
if(savedInstanceState instanceof Bundle) {
/** Let's find out where we were. */
mMockGpsProviderIndex = savedInstanceState.getInt(MOCK_GPS_PROVIDER_INDEX, 0);
}
/** Setup GPS. */
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){
// use real GPS provider if enabled on the device
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
}
else if(!locationManager.isProviderEnabled(MockGpsProvider.GPS_MOCK_PROVIDER)) {
// otherwise enable the mock GPS provider
locationManager.addTestProvider(MockGpsProvider.GPS_MOCK_PROVIDER, false, false,
false, false, true, false, false, 0, 5);
locationManager.setTestProviderEnabled(MockGpsProvider.GPS_MOCK_PROVIDER, true);
}
if(locationManager.isProviderEnabled(MockGpsProvider.GPS_MOCK_PROVIDER)) {
locationManager.requestLocationUpdates(MockGpsProvider.GPS_MOCK_PROVIDER, 0, 0, this);
/** Load mock GPS data from file and create mock GPS provider. */
try {
// create a list of Strings that can dynamically grow
List<String> data = new ArrayList<String>();
/** read a CSV file containing WGS84 coordinates from the 'assets' folder
* (The website http://www.gpsies.com offers downloadable tracks. Select
* a track and download it as a CSV file. Then add it to your assets folder.)
*/
InputStream is = getAssets().open("mock_gps_data.csv");
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
// add each line in the file to the list
String line = null;
while ((line = reader.readLine()) != null) {
data.add(line);
}
// convert to a simple array so we can pass it to the AsyncTask
String[] coordinates = new String[data.size()];
data.toArray(coordinates);
// create new AsyncTask and pass the list of GPS coordinates
mMockGpsProviderTask = new MockGpsProvider();
mMockGpsProviderTask.execute(coordinates);
}
catch (Exception e) {}
}
}
#Override
public void onDestroy() {
super.onDestroy();
// stop the mock GPS provider by calling the 'cancel(true)' method
try {
mMockGpsProviderTask.cancel(true);
mMockGpsProviderTask = null;
}
catch (Exception e) {}
// remove it from the location manager
try {
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.removeTestProvider(MockGpsProvider.GPS_MOCK_PROVIDER);
}
catch (Exception e) {}
}
#Override
public void onSaveInstanceState(Bundle savedInstanceState) {
// store where we are before closing the app, so we can skip to the location right away when restarting
savedInstanceState.putInt(MOCK_GPS_PROVIDER_INDEX, mMockGpsProviderIndex);
super.onSaveInstanceState(savedInstanceState);
}
#Override
public void onLocationChanged(Location location) {
// show the received location in the view
TextView view = (TextView) findViewById(R.id.text);
view.setText( "index:" + mMockGpsProviderIndex
+ "\nlongitude:" + location.getLongitude()
+ "\nlatitude:" + location.getLatitude()
+ "\naltitude:" + location.getAltitude() );
}
#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
}
/** Define a mock GPS provider as an asynchronous task of this Activity. */
private class MockGpsProvider extends AsyncTask<String, Integer, Void> {
public static final String LOG_TAG = "GpsMockProvider";
public static final String GPS_MOCK_PROVIDER = "GpsMockProvider";
/** Keeps track of the currently processed coordinate. */
public Integer index = 0;
#Override
protected Void doInBackground(String... data) {
// process data
for (String str : data) {
// skip data if needed (see the Activity's savedInstanceState functionality)
if(index < mMockGpsProviderIndex) {
index++;
continue;
}
// let UI Thread know which coordinate we are processing
publishProgress(index);
// retrieve data from the current line of text
Double latitude = null;
Double longitude = null;
Double altitude= null;
try {
String[] parts = str.split(",");
latitude = Double.valueOf(parts[0]);
longitude = Double.valueOf(parts[1]);
altitude = Double.valueOf(parts[2]);
}
catch(NullPointerException e) { break; } // no data available
catch(Exception e) { continue; } // empty or invalid line
// translate to actual GPS location
Location location = new Location(GPS_MOCK_PROVIDER);
location.setLatitude(latitude);
location.setLongitude(longitude);
location.setAltitude(altitude);
location.setTime(System.currentTimeMillis());
location.setLatitude(latitude);
location.setLongitude(longitude);
location.setAccuracy(16F);
location.setAltitude(0D);
location.setTime(System.currentTimeMillis());
location.setBearing(0F);
// show debug message in log
Log.d(LOG_TAG, location.toString());
// provide the new location
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.setTestProviderLocation(GPS_MOCK_PROVIDER, location);
// sleep for a while before providing next location
try {
Thread.sleep(200);
// gracefully handle Thread interruption (important!)
if(Thread.currentThread().isInterrupted())
throw new InterruptedException("");
} catch (InterruptedException e) {
break;
}
// keep track of processed locations
index++;
}
return null;
}
#Override
protected void onProgressUpdate(Integer... values) {
Log.d(LOG_TAG, "onProgressUpdate():"+values[0]);
mMockGpsProviderIndex = values[0];
}
}
}
Problem solved: I added the following code to set my current location and it can successfully show up in google map application.
location.setLatitude(latitude);
location.setLongitude(longitude);
location.setBearing(bearing);
location.setSpeed(speed);
location.setAltitude(altitude);
location.setTime(new Date().getTime());
location.setProvider(LocationManager.GPS_PROVIDER);
location.setAccuracy(1);
Conclusion: If you want to use mock location service in the new version of android, you have to set every attribute by yourself.