Locationlistener of Network_Provider Is Enabled But , Onlocationchanged Is Never Called

OnLocationChanged callback is never called

It looks like you setup should work, since it doesn't, I would make your example as simple as possible in order to troubleshoot. I would make your request look like

requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

This way you get ALL the updates possible. And comment out the part about getting the last known location. It's not needed yet.

Then in onLocationChanged(), just have

Log.v(TAG, "IN ON LOCATION CHANGE, lat=" + latitude + ", lon=" + longitude);

Comment out the rest so that you keep your listener active. This should give you a stream of updates on a real device. On the emulator, you'll need to use DDMS, and you'll get one GPS update each time you press send.

onLocationChanged() never called

Do you never get a location or only as you write in your comment "sometimes it gets location but not at the time of click."?

Might be that your code is faster than LocationManager, which might not yet have called onLocationChanged(). Change your code in order to get the last known location, or wait until your locListener was called:

locManager.requestLocationUpdates(
  LocationManager.GPS_PROVIDER, 1000, 1, locListener);
mobileLocation = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (mobileLocation != null) {

onlocationchanged not called in Android

use this code worked in all devices and tested:

 private void getCurrentLocation() {
//        Log.e("getLocation","Called");

        LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        LocationListener locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                mlat = location.getLatitude();
                mlon = location.getLongitude();
       String mLogn = Double.toString(mlon);
               String mLatd = Double.toString(mlat);
//                Log.e("mLogn",""+mLogn);
//                Log.e("mLatd",""+mLatd);
                mLogn=mLogn.trim();
                mLatd=mLatd.trim();
                if (mLatd==null || mLogn==null) {
                    if (mLatd.isEmpty()) {
                        mLatd = "No data found";
                    }
                    if (mLogn.isEmpty()) {
                        mLogn = "No data found";
                    }
                }

                // Log.e("Location",""+mlon+" "+mlat);
//                Toast.makeText(CampaignTrain.this, "your location is " + mLogn + " " + mLatd, Toast.LENGTH_SHORT).show();

            }

            @Override
            public void onStatusChanged(String s, int i, Bundle bundle) {

            }

            @Override
            public void onProviderEnabled(String s) {

            }

            @Override
            public void onProviderDisabled(String s) {

            }
        };
        String locationProvide = LocationManager.NETWORK_PROVIDER;
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_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.
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},COARSE_LOCATION_REQUEST_CODE);
                return;
            }

        }
        if ( ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED){
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION},FINE_LOCATION_REQUEST_CODE);
                return;
            }

        }
        locationManager.requestLocationUpdates(locationProvide, 0, 0, locationListener);
        Location lastLocation=locationManager.getLastKnownLocation(locationProvide);

    }

and set the runtime permission :

int FINE_LOCATION_REQUEST_CODE=101;
int COARSE_LOCATION_REQUEST_CODE=102;

     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
            switch (requestCode)
            {

               case COARSE_LOCATION_REQUEST_CODE:
                {
                    if (grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED)
                    {

                    }
                    else
                    {
                        mLatd="User denied location";
                        mLogn="User denied location";
                    }
                    return;
                }
                case FINE_LOCATION_REQUEST_CODE:
                {
                    if (grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED)
                    {

                    }
                    else
                    {
                        mLatd="User denied location";
                        mLogn="User denied location";
                    }
                    return;
                }
            }
        }

OnLocationChanged is never called

I found a problem. GPS in my phone isn't working. If I use only the network provider it works. Other GPS apps can't get any location from gps too.

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