MapsActivity.java

package com.example.abdullah.opencvframeget;

import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
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, LocationListener {

    private GoogleMap mMap;
    LocationManager lm;
    double lat, lg;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps2);
        // 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);
        lm = (LocationManager) getSystemService(LOCATION_SERVICE);
        //lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1, Criteria.ACCURACY_COARSE, (LocationListener) this);

        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;
        }
        lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1, Criteria.ACCURACY_FINE, (LocationListener) this);
        //lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1, Criteria.ACCURACY_COARSE, (LocationListener) this);





    }


    /**
     * 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));
    }

    @Override
    public void onLocationChanged(Location location) {
        mMap.clear();
        lat = location.getLatitude();
        lg = location.getLongitude();
        LatLng ME = new LatLng(lat, lg);
        mMap.addMarker(new MarkerOptions().position(ME).title("You Are Here"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(ME));
        mMap.animateCamera(CameraUpdateFactory.zoomTo(16),3000,null);

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
    public void onBackPressed()
    {
        Intent intentMain =new Intent(this, MainActivity.class);
        startActivity(intentMain);
        finish();
        // do something on back.
    }
}